* [PATCH 01/20] osdep: add 'ignore_value(x)' macro
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 02/20] trace: use 'ignore_value()' instead of a dummy variable Daniel P. Berrangé
` (19 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
Functions annotated with 'warn_unused_result' cannot be cast
to (void) to silence the compiler. Add the ignore_vaule()
macro which tricks the compiler into thinking the result is
genuinely used, avoiding the need for manual workarounds where
the return value is intentionally ignored.
This clever macro is derived from one originating with the
GNULIB project:
https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/ignore-value.h;hb=HEAD
but simplified since we don't need compat with old GCC and
optimizing on clang is overkill.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
include/qemu/osdep.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 1ec5b42230b..c1ca2c127b6 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -251,6 +251,14 @@ extern "C" {
#endif
+/*
+ * Merely casting to (void) is not sufficient for functions
+ * annotated with the "warn_unused_result" attribute
+ */
+#define ignore_value(x) \
+ (__extension__ ({ __typeof__(x) __x = (x); (void) __x; }))
+
+
/*
* For mingw, as of v6.0.0, the function implementing the assert macro is
* not marked as noreturn, so the compiler cannot delete code following an
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 02/20] trace: use 'ignore_value()' instead of a dummy variable
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 01/20] osdep: add 'ignore_value(x)' macro Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 03/20] trace: fix handling of char** in UST backend Daniel P. Berrangé
` (18 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
This pattern is more concise than using a dummy variable which
in turn needs annotating as unused.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
trace/ftrace.c | 3 +--
trace/simple.c | 9 ++++-----
2 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/trace/ftrace.c b/trace/ftrace.c
index 6875faedb9c..c1ed6ad4454 100644
--- a/trace/ftrace.c
+++ b/trace/ftrace.c
@@ -41,7 +41,6 @@ static int find_mount(char *mount_point, const char *fstype)
void ftrace_write(const char *fmt, ...)
{
char ftrace_buf[MAX_TRACE_STRLEN];
- int unused __attribute__ ((unused));
int trlen;
va_list ap;
@@ -50,7 +49,7 @@ void ftrace_write(const char *fmt, ...)
va_end(ap);
trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);
- unused = write(trace_marker_fd, ftrace_buf, trlen);
+ ignore_value(write(trace_marker_fd, ftrace_buf, trlen));
}
bool ftrace_init(void)
diff --git a/trace/simple.c b/trace/simple.c
index c0aba00cb7f..e148ca44530 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -163,7 +163,6 @@ static gpointer writeout_thread(gpointer opaque)
} dropped;
unsigned int idx = 0;
int dropped_count;
- size_t unused __attribute__ ((unused));
uint64_t type = TRACE_RECORD_TYPE_EVENT;
for (;;) {
@@ -179,13 +178,13 @@ static gpointer writeout_thread(gpointer opaque)
} while (!g_atomic_int_compare_and_exchange(&dropped_events,
dropped_count, 0));
dropped.rec.arguments[0] = dropped_count;
- unused = fwrite(&type, sizeof(type), 1, trace_fp);
- unused = fwrite(&dropped.rec, dropped.rec.length, 1, trace_fp);
+ ignore_value(fwrite(&type, sizeof(type), 1, trace_fp));
+ ignore_value(fwrite(&dropped.rec, dropped.rec.length, 1, trace_fp));
}
while (get_trace_record(idx, &recordptr)) {
- unused = fwrite(&type, sizeof(type), 1, trace_fp);
- unused = fwrite(recordptr, recordptr->length, 1, trace_fp);
+ ignore_value(fwrite(&type, sizeof(type), 1, trace_fp));
+ ignore_value(fwrite(recordptr, recordptr->length, 1, trace_fp));
writeout_idx += recordptr->length;
free(recordptr); /* don't use g_free, can deadlock when traced */
idx = writeout_idx % TRACE_BUF_LEN;
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 03/20] trace: fix handling of char** in UST backend
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 01/20] osdep: add 'ignore_value(x)' macro Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 02/20] trace: use 'ignore_value()' instead of a dummy variable Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 04/20] hw/xen: replace "long unsigned int" with "unsigned long " for dtrace Daniel P. Berrangé
` (17 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The UST trace backend fails to compile on version 2.14.0, as we
pass a "char **" arg as to ctf_string(), which only expects 'char *'.
It should instead be treated the same way as generic pointers, and
emitted as hex.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/format/ust_events_h.py | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/scripts/tracetool/format/ust_events_h.py b/scripts/tracetool/format/ust_events_h.py
index cee7970a403..76c883bc5c0 100644
--- a/scripts/tracetool/format/ust_events_h.py
+++ b/scripts/tracetool/format/ust_events_h.py
@@ -72,7 +72,9 @@ def generate(events, backend, group):
names = e.args.names()
fmts = e.formats()
for t,n,f in zip(types, names, fmts):
- if ('char *' in t) or ('char*' in t):
+ if ('char **' in t) or ('char**' in t):
+ out(' ctf_integer_hex(' + t + ', ' + n + ', ' + n + ')')
+ elif ('char *' in t) or ('char*' in t):
out(' ctf_string(' + n + ', ' + n + ')')
elif ("%p" in f) or ("x" in f) or ("PRIx" in f):
out(' ctf_integer_hex('+ t + ', ' + n + ', ' + n + ')')
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 04/20] hw/xen: replace "long unsigned int" with "unsigned long " for dtrace
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (2 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 03/20] trace: fix handling of char** in UST backend Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 17:56 ` Philippe Mathieu-Daudé
2026-10-01 15:12 ` [PATCH 05/20] trace: block use of "long int" " Daniel P. Berrangé
` (16 subsequent siblings)
20 siblings, 1 reply; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
dtrace (or at least systemtap's fake "dtrace" binary) doesn't like to
see "int" and "long" together in the typename, it just wants the
bare "long".
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
hw/xen/trace-events | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/xen/trace-events b/hw/xen/trace-events
index b67942d07b4..a31983ce1d3 100644
--- a/hw/xen/trace-events
+++ b/hw/xen/trace-events
@@ -57,8 +57,8 @@ cpu_ioreq_config_read(void *req, uint32_t sbdf, uint32_t reg, uint32_t size, uin
cpu_ioreq_config_write(void *req, uint32_t sbdf, uint32_t reg, uint32_t size, uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
cpu_get_ioreq_from_shared_memory_req_not_ready(int state, int data_is_ptr, uint64_t addr, uint64_t data, uint32_t count, uint32_t size) "I/O request not ready: 0x%x, ptr: 0x%x, port: 0x%"PRIx64", data: 0x%"PRIx64", count: %u, size: %u"
xen_main_loop_prepare_init_cpu(int id, void *cpu) "cpu_by_vcpu_id[%d]=%p"
-xen_map_ioreq_server_shared_page(long unsigned int ioreq_pfn) "shared page at pfn 0x%lx"
-xen_map_ioreq_server_buffered_io_page(long unsigned int ioreq_pfn) "buffered io page at pfn 0x%lx"
+xen_map_ioreq_server_shared_page(unsigned long ioreq_pfn) "shared page at pfn 0x%lx"
+xen_map_ioreq_server_buffered_io_page(unsigned long ioreq_pfn) "buffered io page at pfn 0x%lx"
xen_map_ioreq_server_buffered_io_evtchn(int bufioreq_evtchn) "buffered io evtchn is 0x%x"
destroy_hvm_domain_cannot_acquire_handle(void) "Cannot acquire xenctrl handle"
destroy_hvm_domain_failed_action(const char *action, int sts, char *errno_s) "xc_domain_shutdown failed to issue %s, sts %d, %s"
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 05/20] trace: block use of "long int" for dtrace
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (3 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 04/20] hw/xen: replace "long unsigned int" with "unsigned long " for dtrace Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 06/20] trace: drop unused trace_event_set_state_dynamic_init() Daniel P. Berrangé
` (15 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
dtrace (or at least systemtap's fake "dtrace" binary) complains about a
syntax error due to use of "long int", as it wants a bare "long" type
Enforce this when parsing the trace-events files.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/__init__.py | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 61ba6f1ba8c..6ed7cdd6ce4 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -177,6 +177,11 @@ def out(*lines, **kwargs):
def validate_type(name):
bits = name.split(" ")
+
+ if "long" in bits and "int" in bits:
+ raise ValueError("Invalid use of 'int' typename in %s, "
+ "use 'long' alone" % name)
+
for bit in bits:
bit = re.sub(r"\*", "", bit)
if bit == "":
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 06/20] trace: drop unused trace_event_set_state_dynamic_init()
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (4 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 05/20] trace: block use of "long int" " Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 07/20] trace: remove obsolete references to vcpu property Daniel P. Berrangé
` (14 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The use of this method was mistakenly dropped in 0d4e995c73.
When the 'vcpu' property was dropped, however, this became
functionally identical to trace_event_set_state_dynamic().
Fixes: 0d4e995c7368f8bdc8845beb499b650386a38819
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
stubs/trace-control.c | 5 -----
trace/control-target.c | 21 ---------------------
trace/event-internal.h | 2 --
3 files changed, 28 deletions(-)
diff --git a/stubs/trace-control.c b/stubs/trace-control.c
index b428f34c878..3f196835db0 100644
--- a/stubs/trace-control.c
+++ b/stubs/trace-control.c
@@ -11,11 +11,6 @@
#include "trace/control.h"
-void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
-{
- trace_event_set_state_dynamic(ev, state);
-}
-
void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
bool state_pre;
diff --git a/trace/control-target.c b/trace/control-target.c
index 57ceac21084..24d9b7abbde 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -10,27 +10,6 @@
#include "qemu/osdep.h"
#include "trace/control.h"
-
-void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
-{
- bool state_pre;
- assert(trace_event_get_state_static(ev));
- /*
- * We ignore the "vcpu" property here, since no vCPUs have been created
- * yet. Then dstate can only be 1 or 0.
- */
- state_pre = *ev->dstate;
- if (state_pre != state) {
- if (state) {
- trace_events_enabled_count++;
- *ev->dstate = 1;
- } else {
- trace_events_enabled_count--;
- *ev->dstate = 0;
- }
- }
-}
-
void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
assert(trace_event_get_state_static(ev));
diff --git a/trace/event-internal.h b/trace/event-internal.h
index 0c24e01b521..1d57b0ff1b5 100644
--- a/trace/event-internal.h
+++ b/trace/event-internal.h
@@ -37,6 +37,4 @@ typedef struct TraceEvent {
uint16_t *dstate;
} TraceEvent;
-void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);
-
#endif /* TRACE__EVENT_INTERNAL_H */
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 07/20] trace: remove obsolete references to vcpu property
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (5 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 06/20] trace: drop unused trace_event_set_state_dynamic_init() Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 17:58 ` Philippe Mathieu-Daudé
2026-10-01 15:12 ` [PATCH 08/20] trace: drop 'id' from TraceEvent struct when not required Daniel P. Berrangé
` (13 subsequent siblings)
20 siblings, 1 reply; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The 'vcpu' property for trace events was removed 2 years ago
but some mentions of it remain in the code.
Fixes: 7ffc4894a6(trace: Remove deprecated 'vcpu' field from QMP trace events)
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
trace/control-target.c | 6 ------
trace/control.c | 6 ------
trace/control.h | 12 ------------
trace/event-internal.h | 11 -----------
4 files changed, 35 deletions(-)
diff --git a/trace/control-target.c b/trace/control-target.c
index 24d9b7abbde..87b0f5037df 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -14,12 +14,6 @@ void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
assert(trace_event_get_state_static(ev));
- /*
- * There is no longer a "vcpu" property, dstate can only be 1 or
- * 0. With it, we haven't instantiated any vCPU yet, so we will
- * set a global state instead, and trace_init_vcpu will reconcile
- * it afterwards.
- */
bool state_pre = *ev->dstate;
if (state_pre != state) {
if (state) {
diff --git a/trace/control.c b/trace/control.c
index 49f0a4c5cda..6971157cbe7 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -37,7 +37,6 @@ typedef struct TraceEventGroup {
static TraceEventGroup *event_groups;
static size_t nevent_groups;
static uint32_t next_id;
-static uint32_t next_vcpu_id;
#ifdef CONFIG_TRACE_SIMPLE
static bool init_trace_on_startup;
#endif
@@ -304,8 +303,3 @@ void trace_opt_parse(const char *optstr)
trace_opts_file = g_strdup(qemu_opt_get(opts, "file"));
qemu_opts_del(opts);
}
-
-uint32_t trace_get_vcpu_event_count(void)
-{
- return next_vcpu_id;
-}
diff --git a/trace/control.h b/trace/control.h
index 6754bfe052b..20033fb6669 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -139,8 +139,6 @@ static bool trace_event_get_state_static(TraceEvent *ev);
* trace_event_get_state_dynamic:
*
* Get the dynamic tracing state of an event.
- *
- * If the event has the 'vcpu' property, gets the OR'ed state of all vCPUs.
*/
static bool trace_event_get_state_dynamic(TraceEvent *ev);
@@ -149,8 +147,6 @@ static bool trace_event_get_state_dynamic(TraceEvent *ev);
*
* Set the dynamic tracing state of an event.
*
- * If the event has the 'vcpu' property, sets the state on all vCPUs.
- *
* Pre-condition: trace_event_get_state_static(ev) == true
*/
void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
@@ -203,14 +199,6 @@ extern QemuOptsList qemu_trace_opts;
*/
void trace_opt_parse(const char *optstr);
-/**
- * trace_get_vcpu_event_count:
- *
- * Return the number of known vcpu-specific events
- */
-uint32_t trace_get_vcpu_event_count(void);
-
-
#include "control-internal.h"
#endif /* TRACE__CONTROL_H */
diff --git a/trace/event-internal.h b/trace/event-internal.h
index 1d57b0ff1b5..cc095a6ad54 100644
--- a/trace/event-internal.h
+++ b/trace/event-internal.h
@@ -10,12 +10,6 @@
#ifndef TRACE__EVENT_INTERNAL_H
#define TRACE__EVENT_INTERNAL_H
-/*
- * Special value for TraceEvent.vcpu_id field to indicate
- * that the event is not VCPU specific
- */
-#define TRACE_VCPU_EVENT_NONE ((uint32_t)-1)
-
/**
* TraceEvent:
* @id: Unique event identifier.
@@ -23,11 +17,6 @@
* @sstate: Static tracing state.
* @dstate: Dynamic tracing state
*
- * Interpretation of @dstate depends on whether the event has the 'vcpu'
- * property:
- * - false: Boolean value indicating whether the event is active.
- * - true : Integral counting the number of vCPUs that have this event enabled.
- *
* Opaque generic description of a tracing event.
*/
typedef struct TraceEvent {
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* Re: [PATCH 07/20] trace: remove obsolete references to vcpu property
2026-10-01 15:12 ` [PATCH 07/20] trace: remove obsolete references to vcpu property Daniel P. Berrangé
@ 2026-10-01 17:58 ` Philippe Mathieu-Daudé
0 siblings, 0 replies; 34+ messages in thread
From: Philippe Mathieu-Daudé @ 2026-10-01 17:58 UTC (permalink / raw)
To: Daniel P. Berrangé, qemu-devel; +Cc: Stefan Hajnoczi
On 2026-10-01 17:12, Daniel P. Berrangé wrote:
> The 'vcpu' property for trace events was removed 2 years ago
> but some mentions of it remain in the code.
>
> Fixes: 7ffc4894a6(trace: Remove deprecated 'vcpu' field from QMP trace events)
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
> trace/control-target.c | 6 ------
> trace/control.c | 6 ------
> trace/control.h | 12 ------------
> trace/event-internal.h | 11 -----------
> 4 files changed, 35 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
^ permalink raw reply [flat|nested] 34+ messages in thread
* [PATCH 08/20] trace: drop 'id' from TraceEvent struct when not required
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (6 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 07/20] trace: remove obsolete references to vcpu property Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 09/20] trace: change "DSTATE" variables from uint16_t to uint8_t Daniel P. Berrangé
` (12 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
Only "simpletrace" uses the "id" field from the TraceEvent struct.
Omit it when this backend is not enabled to save memory.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/format/c.py | 2 ++
tests/tracetool/dtrace.c | 4 ++++
tests/tracetool/ftrace.c | 4 ++++
tests/tracetool/log.c | 4 ++++
tests/tracetool/simple.c | 4 ++++
tests/tracetool/syslog.c | 4 ++++
tests/tracetool/ust.c | 4 ++++
trace/control-internal.h | 2 ++
trace/control.c | 4 +++-
trace/control.h | 3 ++-
trace/event-internal.h | 2 ++
11 files changed, 35 insertions(+), 2 deletions(-)
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index 50e03313cbf..abe738ac423 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -34,7 +34,9 @@ def generate(events, backend, group):
for e in events:
out('TraceEvent %(event)s = {',
+ '#ifdef CONFIG_TRACE_SIMPLE',
' .id = 0,',
+ '#endif',
' .name = \"%(name)s\",',
' .sstate = %(sstate)s,',
' .dstate = &%(dstate)s',
diff --git a/tests/tracetool/dtrace.c b/tests/tracetool/dtrace.c
index 9f862fa14d2..05a93918240 100644
--- a/tests/tracetool/dtrace.c
+++ b/tests/tracetool/dtrace.c
@@ -8,13 +8,17 @@
uint16_t _TRACE_TEST_BLAH_DSTATE;
uint16_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_blah",
.sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_wibble",
.sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
diff --git a/tests/tracetool/ftrace.c b/tests/tracetool/ftrace.c
index 9f862fa14d2..05a93918240 100644
--- a/tests/tracetool/ftrace.c
+++ b/tests/tracetool/ftrace.c
@@ -8,13 +8,17 @@
uint16_t _TRACE_TEST_BLAH_DSTATE;
uint16_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_blah",
.sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_wibble",
.sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
diff --git a/tests/tracetool/log.c b/tests/tracetool/log.c
index 9f862fa14d2..05a93918240 100644
--- a/tests/tracetool/log.c
+++ b/tests/tracetool/log.c
@@ -8,13 +8,17 @@
uint16_t _TRACE_TEST_BLAH_DSTATE;
uint16_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_blah",
.sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_wibble",
.sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
diff --git a/tests/tracetool/simple.c b/tests/tracetool/simple.c
index 0484177481c..490d6f379a5 100644
--- a/tests/tracetool/simple.c
+++ b/tests/tracetool/simple.c
@@ -8,13 +8,17 @@
uint16_t _TRACE_TEST_BLAH_DSTATE;
uint16_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_blah",
.sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_wibble",
.sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
diff --git a/tests/tracetool/syslog.c b/tests/tracetool/syslog.c
index 9f862fa14d2..05a93918240 100644
--- a/tests/tracetool/syslog.c
+++ b/tests/tracetool/syslog.c
@@ -8,13 +8,17 @@
uint16_t _TRACE_TEST_BLAH_DSTATE;
uint16_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_blah",
.sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_wibble",
.sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
diff --git a/tests/tracetool/ust.c b/tests/tracetool/ust.c
index 9f862fa14d2..05a93918240 100644
--- a/tests/tracetool/ust.c
+++ b/tests/tracetool/ust.c
@@ -8,13 +8,17 @@
uint16_t _TRACE_TEST_BLAH_DSTATE;
uint16_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_blah",
.sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
+#endif
.name = "test_wibble",
.sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
diff --git a/trace/control-internal.h b/trace/control-internal.h
index 8d818d359be..f626b047264 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -19,11 +19,13 @@ static inline bool trace_event_is_pattern(const char *str)
return strchr(str, '*') != NULL;
}
+#ifdef CONFIG_TRACE_SIMPLE
static inline uint32_t trace_event_get_id(TraceEvent *ev)
{
assert(ev != NULL);
return ev->id;
}
+#endif
static inline const char * trace_event_get_name(TraceEvent *ev)
{
diff --git a/trace/control.c b/trace/control.c
index 6971157cbe7..947b220056a 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -36,8 +36,8 @@ typedef struct TraceEventGroup {
static TraceEventGroup *event_groups;
static size_t nevent_groups;
-static uint32_t next_id;
#ifdef CONFIG_TRACE_SIMPLE
+static uint32_t next_id;
static bool init_trace_on_startup;
#endif
static char *trace_opts_file;
@@ -65,10 +65,12 @@ QemuOptsList qemu_trace_opts = {
void trace_event_register_group(TraceEvent **events)
{
+#ifdef CONFIG_TRACE_SIMPLE
size_t i;
for (i = 0; events[i] != NULL; i++) {
events[i]->id = next_id++;
}
+#endif
event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
event_groups[nevent_groups].events = events;
nevent_groups++;
diff --git a/trace/control.h b/trace/control.h
index 20033fb6669..e77c07a8e68 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -81,13 +81,14 @@ TraceEvent *trace_event_name(const char *name);
*/
static bool trace_event_is_pattern(const char *str);
-
+#ifdef CONFIG_TRACE_SIMPLE
/**
* trace_event_get_id:
*
* Get the identifier of an event.
*/
static uint32_t trace_event_get_id(TraceEvent *ev);
+#endif
/**
* trace_event_get_name:
diff --git a/trace/event-internal.h b/trace/event-internal.h
index cc095a6ad54..ecf2caabd03 100644
--- a/trace/event-internal.h
+++ b/trace/event-internal.h
@@ -20,7 +20,9 @@
* Opaque generic description of a tracing event.
*/
typedef struct TraceEvent {
+#ifdef CONFIG_TRACE_SIMPLE
uint32_t id;
+#endif
const char * name;
const bool sstate;
uint16_t *dstate;
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 09/20] trace: change "DSTATE" variables from uint16_t to uint8_t
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (7 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 08/20] trace: drop 'id' from TraceEvent struct when not required Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 10/20] trace: add testing of 'nop' trace backend Daniel P. Berrangé
` (11 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
Previously these variables had two distinct semantics. For
most probes DSTATE was treated as a simple boolean, while
for vcpu probes it was treated as a bitmask of vCPU indexes.
With vcpu probes removed, it is now exclusively a boolean
and thus using uint16_t is a waste of memory.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/format/c.py | 2 +-
scripts/tracetool/format/h.py | 2 +-
scripts/tracetool/format/rs.py | 4 ++--
tests/tracetool/dtrace.c | 4 ++--
tests/tracetool/dtrace.h | 4 ++--
tests/tracetool/dtrace.rs | 6 +++---
tests/tracetool/ftrace.c | 4 ++--
tests/tracetool/ftrace.h | 4 ++--
tests/tracetool/ftrace.rs | 6 +++---
tests/tracetool/log.c | 4 ++--
tests/tracetool/log.h | 4 ++--
tests/tracetool/log.rs | 6 +++---
tests/tracetool/simple.c | 4 ++--
tests/tracetool/simple.h | 4 ++--
tests/tracetool/simple.rs | 6 +++---
tests/tracetool/syslog.c | 4 ++--
tests/tracetool/syslog.h | 4 ++--
tests/tracetool/syslog.rs | 6 +++---
tests/tracetool/ust.c | 4 ++--
tests/tracetool/ust.h | 4 ++--
trace/event-internal.h | 2 +-
21 files changed, 44 insertions(+), 44 deletions(-)
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index abe738ac423..de1c154a881 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -30,7 +30,7 @@ def generate(events, backend, group):
'')
for e in events:
- out('uint16_t %s;' % e.api(e.QEMU_DSTATE))
+ out('uint8_t %s;' % e.api(e.QEMU_DSTATE))
for e in events:
out('TraceEvent %(event)s = {',
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index dd58713a158..4dc1ad7eb15 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -32,7 +32,7 @@ def generate(events, backend, group):
event = e.api(e.QEMU_EVENT))
for e in events:
- out('extern uint16_t %s;' % e.api(e.QEMU_DSTATE))
+ out('extern uint8_t %s;' % e.api(e.QEMU_DSTATE))
# static state
for e in events:
diff --git a/scripts/tracetool/format/rs.py b/scripts/tracetool/format/rs.py
index 7d9af7edfee..1fddcee1ad2 100644
--- a/scripts/tracetool/format/rs.py
+++ b/scripts/tracetool/format/rs.py
@@ -26,7 +26,7 @@ def generate(events, backend, group):
'',
'#[allow(dead_code)]',
'#[inline(always)]',
- 'fn trace_event_state_is_enabled(dstate: u16) -> bool {',
+ 'fn trace_event_state_is_enabled(dstate: u8) -> bool {',
' (unsafe { trace_events_enabled_count }) != 0 && dstate != 0',
'}',
'',
@@ -39,7 +39,7 @@ def generate(events, backend, group):
for e in events:
out(' #[allow(dead_code)]',
- ' static mut %s: u16;' % e.api(e.QEMU_DSTATE))
+ ' static mut %s: u8;' % e.api(e.QEMU_DSTATE))
out('}',
'')
diff --git a/tests/tracetool/dtrace.c b/tests/tracetool/dtrace.c
index 05a93918240..f83d06252ea 100644
--- a/tests/tracetool/dtrace.c
+++ b/tests/tracetool/dtrace.c
@@ -5,8 +5,8 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint16_t _TRACE_TEST_BLAH_DSTATE;
-uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
diff --git a/tests/tracetool/dtrace.h b/tests/tracetool/dtrace.h
index c8931a8d7b3..0b5b47089e8 100644
--- a/tests/tracetool/dtrace.h
+++ b/tests/tracetool/dtrace.h
@@ -8,8 +8,8 @@
extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint16_t _TRACE_TEST_BLAH_DSTATE;
-extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
#ifndef SDT_USE_VARIADIC
diff --git a/tests/tracetool/dtrace.rs b/tests/tracetool/dtrace.rs
index 3490fcb271a..07398f4731b 100644
--- a/tests/tracetool/dtrace.rs
+++ b/tests/tracetool/dtrace.rs
@@ -8,7 +8,7 @@
#[allow(dead_code)]
#[inline(always)]
-fn trace_event_state_is_enabled(dstate: u16) -> bool {
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
(unsafe { trace_events_enabled_count }) != 0 && dstate != 0
}
@@ -18,9 +18,9 @@ fn trace_event_state_is_enabled(dstate: u16) -> bool {
}
extern "C" {
#[allow(dead_code)]
- static mut _TRACE_TEST_BLAH_DSTATE: u16;
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
#[allow(dead_code)]
- static mut _TRACE_TEST_WIBBLE_DSTATE: u16;
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
}
use std::cell::UnsafeCell;
diff --git a/tests/tracetool/ftrace.c b/tests/tracetool/ftrace.c
index 05a93918240..f83d06252ea 100644
--- a/tests/tracetool/ftrace.c
+++ b/tests/tracetool/ftrace.c
@@ -5,8 +5,8 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint16_t _TRACE_TEST_BLAH_DSTATE;
-uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
diff --git a/tests/tracetool/ftrace.h b/tests/tracetool/ftrace.h
index 1dfe4239413..b34eef17d10 100644
--- a/tests/tracetool/ftrace.h
+++ b/tests/tracetool/ftrace.h
@@ -8,8 +8,8 @@
extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint16_t _TRACE_TEST_BLAH_DSTATE;
-extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
#include "trace/ftrace.h"
diff --git a/tests/tracetool/ftrace.rs b/tests/tracetool/ftrace.rs
index 34f66004902..ff0bcde4b8b 100644
--- a/tests/tracetool/ftrace.rs
+++ b/tests/tracetool/ftrace.rs
@@ -8,7 +8,7 @@
#[allow(dead_code)]
#[inline(always)]
-fn trace_event_state_is_enabled(dstate: u16) -> bool {
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
(unsafe { trace_events_enabled_count }) != 0 && dstate != 0
}
@@ -18,9 +18,9 @@ fn trace_event_state_is_enabled(dstate: u16) -> bool {
}
extern "C" {
#[allow(dead_code)]
- static mut _TRACE_TEST_BLAH_DSTATE: u16;
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
#[allow(dead_code)]
- static mut _TRACE_TEST_WIBBLE_DSTATE: u16;
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
}
#[inline(always)]
diff --git a/tests/tracetool/log.c b/tests/tracetool/log.c
index 05a93918240..f83d06252ea 100644
--- a/tests/tracetool/log.c
+++ b/tests/tracetool/log.c
@@ -5,8 +5,8 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint16_t _TRACE_TEST_BLAH_DSTATE;
-uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
index c7795871f85..ff510d54908 100644
--- a/tests/tracetool/log.h
+++ b/tests/tracetool/log.h
@@ -8,8 +8,8 @@
extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint16_t _TRACE_TEST_BLAH_DSTATE;
-extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
#include "qemu/log-for-trace.h"
diff --git a/tests/tracetool/log.rs b/tests/tracetool/log.rs
index 770758611d1..0f052bb2c9c 100644
--- a/tests/tracetool/log.rs
+++ b/tests/tracetool/log.rs
@@ -8,7 +8,7 @@
#[allow(dead_code)]
#[inline(always)]
-fn trace_event_state_is_enabled(dstate: u16) -> bool {
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
(unsafe { trace_events_enabled_count }) != 0 && dstate != 0
}
@@ -18,9 +18,9 @@ fn trace_event_state_is_enabled(dstate: u16) -> bool {
}
extern "C" {
#[allow(dead_code)]
- static mut _TRACE_TEST_BLAH_DSTATE: u16;
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
#[allow(dead_code)]
- static mut _TRACE_TEST_WIBBLE_DSTATE: u16;
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
}
#[inline(always)]
diff --git a/tests/tracetool/simple.c b/tests/tracetool/simple.c
index 490d6f379a5..820ddb575b0 100644
--- a/tests/tracetool/simple.c
+++ b/tests/tracetool/simple.c
@@ -5,8 +5,8 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint16_t _TRACE_TEST_BLAH_DSTATE;
-uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
diff --git a/tests/tracetool/simple.h b/tests/tracetool/simple.h
index ec6fcb22c3c..735cb21d911 100644
--- a/tests/tracetool/simple.h
+++ b/tests/tracetool/simple.h
@@ -8,8 +8,8 @@
extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint16_t _TRACE_TEST_BLAH_DSTATE;
-extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
void _simple_trace_test_blah(void *context, const char *filename);
diff --git a/tests/tracetool/simple.rs b/tests/tracetool/simple.rs
index 92f896ef178..976feddde5b 100644
--- a/tests/tracetool/simple.rs
+++ b/tests/tracetool/simple.rs
@@ -8,7 +8,7 @@
#[allow(dead_code)]
#[inline(always)]
-fn trace_event_state_is_enabled(dstate: u16) -> bool {
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
(unsafe { trace_events_enabled_count }) != 0 && dstate != 0
}
@@ -18,9 +18,9 @@ fn trace_event_state_is_enabled(dstate: u16) -> bool {
}
extern "C" {
#[allow(dead_code)]
- static mut _TRACE_TEST_BLAH_DSTATE: u16;
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
#[allow(dead_code)]
- static mut _TRACE_TEST_WIBBLE_DSTATE: u16;
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
}
#[inline(always)]
diff --git a/tests/tracetool/syslog.c b/tests/tracetool/syslog.c
index 05a93918240..f83d06252ea 100644
--- a/tests/tracetool/syslog.c
+++ b/tests/tracetool/syslog.c
@@ -5,8 +5,8 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint16_t _TRACE_TEST_BLAH_DSTATE;
-uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
diff --git a/tests/tracetool/syslog.h b/tests/tracetool/syslog.h
index ed4305554c1..4203b8b37dc 100644
--- a/tests/tracetool/syslog.h
+++ b/tests/tracetool/syslog.h
@@ -8,8 +8,8 @@
extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint16_t _TRACE_TEST_BLAH_DSTATE;
-extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
#include <syslog.h>
diff --git a/tests/tracetool/syslog.rs b/tests/tracetool/syslog.rs
index 378d03d34b2..9688dac84a5 100644
--- a/tests/tracetool/syslog.rs
+++ b/tests/tracetool/syslog.rs
@@ -8,7 +8,7 @@
#[allow(dead_code)]
#[inline(always)]
-fn trace_event_state_is_enabled(dstate: u16) -> bool {
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
(unsafe { trace_events_enabled_count }) != 0 && dstate != 0
}
@@ -18,9 +18,9 @@ fn trace_event_state_is_enabled(dstate: u16) -> bool {
}
extern "C" {
#[allow(dead_code)]
- static mut _TRACE_TEST_BLAH_DSTATE: u16;
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
#[allow(dead_code)]
- static mut _TRACE_TEST_WIBBLE_DSTATE: u16;
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
}
#[inline(always)]
diff --git a/tests/tracetool/ust.c b/tests/tracetool/ust.c
index 05a93918240..f83d06252ea 100644
--- a/tests/tracetool/ust.c
+++ b/tests/tracetool/ust.c
@@ -5,8 +5,8 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint16_t _TRACE_TEST_BLAH_DSTATE;
-uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
TraceEvent _TRACE_TEST_BLAH_EVENT = {
#ifdef CONFIG_TRACE_SIMPLE
.id = 0,
diff --git a/tests/tracetool/ust.h b/tests/tracetool/ust.h
index b7acd0c39b1..079b2c74491 100644
--- a/tests/tracetool/ust.h
+++ b/tests/tracetool/ust.h
@@ -8,8 +8,8 @@
extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint16_t _TRACE_TEST_BLAH_DSTATE;
-extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
#include <lttng/tracepoint.h>
diff --git a/trace/event-internal.h b/trace/event-internal.h
index ecf2caabd03..ad1578aa2c5 100644
--- a/trace/event-internal.h
+++ b/trace/event-internal.h
@@ -25,7 +25,7 @@ typedef struct TraceEvent {
#endif
const char * name;
const bool sstate;
- uint16_t *dstate;
+ uint8_t *dstate;
} TraceEvent;
#endif /* TRACE__EVENT_INTERNAL_H */
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 10/20] trace: add testing of 'nop' trace backend
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (8 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 09/20] trace: change "DSTATE" variables from uint16_t to uint8_t Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 11/20] trace: don't emit TraceEvent structs when 'nop' backend is used Daniel P. Berrangé
` (10 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
This will be used to demonstrate that tracetool outputs the bare
minimum of code when tracing is disabled. Currently, as of this
initial commit of reference output, too much code is generated.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
tests/tracetool/meson.build | 1 +
tests/tracetool/nop.c | 36 ++++++++++++++++++++++
tests/tracetool/nop.h | 29 ++++++++++++++++++
tests/tracetool/nop.rs | 51 +++++++++++++++++++++++++++++++
tests/tracetool/tracetool-test.py | 2 +-
5 files changed, 118 insertions(+), 1 deletion(-)
create mode 100644 tests/tracetool/nop.c
create mode 100644 tests/tracetool/nop.h
create mode 100644 tests/tracetool/nop.rs
diff --git a/tests/tracetool/meson.build b/tests/tracetool/meson.build
index 09bbaaa86bf..f4f583e6224 100644
--- a/tests/tracetool/meson.build
+++ b/tests/tracetool/meson.build
@@ -5,6 +5,7 @@ test_env.set('PYTHONPATH', meson.project_source_root() / 'scripts')
test_env.set('PYTHONIOENCODING', 'utf-8')
backends = [
+ 'nop',
'dtrace',
'ftrace',
'log',
diff --git a/tests/tracetool/nop.c b/tests/tracetool/nop.c
new file mode 100644
index 00000000000..f83d06252ea
--- /dev/null
+++ b/tests/tracetool/nop.c
@@ -0,0 +1,36 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "qemu/osdep.h"
+#include "qemu/module.h"
+#include "trace-testsuite.h"
+
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
+TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
+ .id = 0,
+#endif
+ .name = "test_blah",
+ .sstate = TRACE_TEST_BLAH_ENABLED,
+ .dstate = &_TRACE_TEST_BLAH_DSTATE
+};
+TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
+ .id = 0,
+#endif
+ .name = "test_wibble",
+ .sstate = TRACE_TEST_WIBBLE_ENABLED,
+ .dstate = &_TRACE_TEST_WIBBLE_DSTATE
+};
+TraceEvent *testsuite_trace_events[] = {
+ &_TRACE_TEST_BLAH_EVENT,
+ &_TRACE_TEST_WIBBLE_EVENT,
+ NULL,
+};
+
+static void trace_testsuite_register_events(void)
+{
+ trace_event_register_group(testsuite_trace_events);
+}
+trace_init(trace_testsuite_register_events)
diff --git a/tests/tracetool/nop.h b/tests/tracetool/nop.h
new file mode 100644
index 00000000000..443f5e0cf6e
--- /dev/null
+++ b/tests/tracetool/nop.h
@@ -0,0 +1,29 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef TRACE_TESTSUITE_GENERATED_TRACERS_H
+#define TRACE_TESTSUITE_GENERATED_TRACERS_H
+
+#include "trace/control.h"
+
+extern TraceEvent _TRACE_TEST_BLAH_EVENT;
+extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
+#define TRACE_TEST_BLAH_ENABLED 1
+#define TRACE_TEST_WIBBLE_ENABLED 1
+
+#define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
+ false)
+
+static inline void trace_test_blah(void *context, const char *filename)
+{
+}
+
+#define TRACE_TEST_WIBBLE_BACKEND_DSTATE() ( \
+ false)
+
+static inline void trace_test_wibble(void *context, int value)
+{
+}
+#endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/nop.rs b/tests/tracetool/nop.rs
new file mode 100644
index 00000000000..5f007cecd04
--- /dev/null
+++ b/tests/tracetool/nop.rs
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// This file is @generated by tracetool, do not edit.
+
+#[allow(unused_imports)]
+use std::ffi::c_char;
+#[allow(unused_imports)]
+use util::bindings;
+
+#[allow(dead_code)]
+#[inline(always)]
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
+ (unsafe { trace_events_enabled_count }) != 0 && dstate != 0
+}
+
+extern "C" {
+ #[allow(dead_code)]
+ static mut trace_events_enabled_count: u32;
+}
+extern "C" {
+ #[allow(dead_code)]
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
+ #[allow(dead_code)]
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_blah_enabled() -> bool
+{
+ false
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_blah(_context: *mut (), _filename: &std::ffi::CStr)
+{
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_wibble_enabled() -> bool
+{
+ false
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_wibble(_context: *mut (), _value: std::ffi::c_int)
+{
+}
+
diff --git a/tests/tracetool/tracetool-test.py b/tests/tracetool/tracetool-test.py
index 59e9ab3d6ef..74f315a4629 100755
--- a/tests/tracetool/tracetool-test.py
+++ b/tests/tracetool/tracetool-test.py
@@ -14,7 +14,7 @@ def get_formats(backend):
"c",
"h",
]
- if backend in {"dtrace", "ftrace", "log", "simple", "syslog"}:
+ if backend in {"nop", "dtrace", "ftrace", "log", "simple", "syslog"}:
formats += ["rs"]
if backend == "dtrace":
formats += [
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 11/20] trace: don't emit TraceEvent structs when 'nop' backend is used
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (9 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 10/20] trace: add testing of 'nop' trace backend Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 12/20] trace: add test of generation with all backends enabled Daniel P. Berrangé
` (9 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The 'nop' backend is a short-hand for no trace probe usage
at all. The emitted functions become a no-op, and as such
there is no need to emit the TraceEvent structs, nor the
DSTATE variables they reference.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/format/c.py | 75 ++++++++++++++++++-----------------
scripts/tracetool/format/h.py | 16 +++++---
tests/tracetool/nop.c | 29 --------------
tests/tracetool/nop.h | 6 +--
4 files changed, 50 insertions(+), 76 deletions(-)
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index de1c154a881..5f6669c917c 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -29,41 +29,42 @@ def generate(events, backend, group):
'#include "%s"' % header,
'')
- for e in events:
- out('uint8_t %s;' % e.api(e.QEMU_DSTATE))
-
- for e in events:
- out('TraceEvent %(event)s = {',
- '#ifdef CONFIG_TRACE_SIMPLE',
- ' .id = 0,',
- '#endif',
- ' .name = \"%(name)s\",',
- ' .sstate = %(sstate)s,',
- ' .dstate = &%(dstate)s',
+ if len(list(backend.backend_modules())):
+ for e in events:
+ out('uint8_t %s;' % e.api(e.QEMU_DSTATE))
+
+ for e in events:
+ out('TraceEvent %(event)s = {',
+ '#ifdef CONFIG_TRACE_SIMPLE',
+ ' .id = 0,',
+ '#endif',
+ ' .name = \"%(name)s\",',
+ ' .sstate = %(sstate)s,',
+ ' .dstate = &%(dstate)s',
+ '};',
+ event = e.api(e.QEMU_EVENT),
+ name = e.name,
+ sstate = "TRACE_%s_ENABLED" % e.name.upper(),
+ dstate = e.api(e.QEMU_DSTATE))
+
+ out('TraceEvent *%(group)s_trace_events[] = {',
+ group = group.lower())
+
+ for e in events:
+ out(' &%(event)s,', event = e.api(e.QEMU_EVENT))
+
+ out(' NULL,',
'};',
- event = e.api(e.QEMU_EVENT),
- name = e.name,
- sstate = "TRACE_%s_ENABLED" % e.name.upper(),
- dstate = e.api(e.QEMU_DSTATE))
-
- out('TraceEvent *%(group)s_trace_events[] = {',
- group = group.lower())
-
- for e in events:
- out(' &%(event)s,', event = e.api(e.QEMU_EVENT))
-
- out(' NULL,',
- '};',
- '')
-
- out('static void trace_%(group)s_register_events(void)',
- '{',
- ' trace_event_register_group(%(group)s_trace_events);',
- '}',
- 'trace_init(trace_%(group)s_register_events)',
- group = group.lower())
-
- backend.generate_begin(active_events, group)
- for event in active_events:
- backend.generate(event, group)
- backend.generate_end(active_events, group)
+ '')
+
+ out('static void trace_%(group)s_register_events(void)',
+ '{',
+ ' trace_event_register_group(%(group)s_trace_events);',
+ '}',
+ 'trace_init(trace_%(group)s_register_events)',
+ group = group.lower())
+
+ backend.generate_begin(active_events, group)
+ for event in active_events:
+ backend.generate(event, group)
+ backend.generate_end(active_events, group)
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 4dc1ad7eb15..6ffb7256e31 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -27,12 +27,16 @@ def generate(events, backend, group):
'#include "%s"' % header,
'')
- for e in events:
- out('extern TraceEvent %(event)s;',
- event = e.api(e.QEMU_EVENT))
-
- for e in events:
- out('extern uint8_t %s;' % e.api(e.QEMU_DSTATE))
+ if len(list(backend.backend_modules())):
+ for e in events:
+ out('extern TraceEvent %(event)s;',
+ event = e.api(e.QEMU_EVENT))
+
+ for e in events:
+ out('extern uint8_t %s;' % e.api(e.QEMU_DSTATE))
+ else:
+ for e in events:
+ out('#define %s 0' % e.api(e.QEMU_DSTATE))
# static state
for e in events:
diff --git a/tests/tracetool/nop.c b/tests/tracetool/nop.c
index f83d06252ea..d34cc0ca742 100644
--- a/tests/tracetool/nop.c
+++ b/tests/tracetool/nop.c
@@ -5,32 +5,3 @@
#include "qemu/module.h"
#include "trace-testsuite.h"
-uint8_t _TRACE_TEST_BLAH_DSTATE;
-uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-TraceEvent _TRACE_TEST_BLAH_EVENT = {
-#ifdef CONFIG_TRACE_SIMPLE
- .id = 0,
-#endif
- .name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
- .dstate = &_TRACE_TEST_BLAH_DSTATE
-};
-TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
-#ifdef CONFIG_TRACE_SIMPLE
- .id = 0,
-#endif
- .name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
- .dstate = &_TRACE_TEST_WIBBLE_DSTATE
-};
-TraceEvent *testsuite_trace_events[] = {
- &_TRACE_TEST_BLAH_EVENT,
- &_TRACE_TEST_WIBBLE_EVENT,
- NULL,
-};
-
-static void trace_testsuite_register_events(void)
-{
- trace_event_register_group(testsuite_trace_events);
-}
-trace_init(trace_testsuite_register_events)
diff --git a/tests/tracetool/nop.h b/tests/tracetool/nop.h
index 443f5e0cf6e..64b6b005684 100644
--- a/tests/tracetool/nop.h
+++ b/tests/tracetool/nop.h
@@ -6,10 +6,8 @@
#include "trace/control.h"
-extern TraceEvent _TRACE_TEST_BLAH_EVENT;
-extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
-extern uint8_t _TRACE_TEST_BLAH_DSTATE;
-extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
+#define _TRACE_TEST_BLAH_DSTATE 0
+#define _TRACE_TEST_WIBBLE_DSTATE 0
#define TRACE_TEST_BLAH_ENABLED 1
#define TRACE_TEST_WIBBLE_ENABLED 1
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 12/20] trace: add test of generation with all backends enabled
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (10 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 11/20] trace: don't emit TraceEvent structs when 'nop' backend is used Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 13/20] trace: remove redundant headers from simple trace backend code Daniel P. Berrangé
` (8 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
This reveals potentially interesting patterns in the generated
code when multiple backends are present.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
tests/tracetool/all.c | 65 +++++++++++++++++
tests/tracetool/all.d | 10 +++
tests/tracetool/all.h | 102 +++++++++++++++++++++++++++
tests/tracetool/all.log-stap | 15 ++++
tests/tracetool/all.rs | 90 +++++++++++++++++++++++
tests/tracetool/all.simpletrace-stap | 16 +++++
tests/tracetool/all.stap | 14 ++++
tests/tracetool/all.ust-events-c | 14 ++++
tests/tracetool/all.ust-events-h | 56 +++++++++++++++
tests/tracetool/meson.build | 3 +-
tests/tracetool/tracetool-test.py | 12 ++--
11 files changed, 392 insertions(+), 5 deletions(-)
create mode 100644 tests/tracetool/all.c
create mode 100644 tests/tracetool/all.d
create mode 100644 tests/tracetool/all.h
create mode 100644 tests/tracetool/all.log-stap
create mode 100644 tests/tracetool/all.rs
create mode 100644 tests/tracetool/all.simpletrace-stap
create mode 100644 tests/tracetool/all.stap
create mode 100644 tests/tracetool/all.ust-events-c
create mode 100644 tests/tracetool/all.ust-events-h
diff --git a/tests/tracetool/all.c b/tests/tracetool/all.c
new file mode 100644
index 00000000000..820ddb575b0
--- /dev/null
+++ b/tests/tracetool/all.c
@@ -0,0 +1,65 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "qemu/osdep.h"
+#include "qemu/module.h"
+#include "trace-testsuite.h"
+
+uint8_t _TRACE_TEST_BLAH_DSTATE;
+uint8_t _TRACE_TEST_WIBBLE_DSTATE;
+TraceEvent _TRACE_TEST_BLAH_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
+ .id = 0,
+#endif
+ .name = "test_blah",
+ .sstate = TRACE_TEST_BLAH_ENABLED,
+ .dstate = &_TRACE_TEST_BLAH_DSTATE
+};
+TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
+#ifdef CONFIG_TRACE_SIMPLE
+ .id = 0,
+#endif
+ .name = "test_wibble",
+ .sstate = TRACE_TEST_WIBBLE_ENABLED,
+ .dstate = &_TRACE_TEST_WIBBLE_DSTATE
+};
+TraceEvent *testsuite_trace_events[] = {
+ &_TRACE_TEST_BLAH_EVENT,
+ &_TRACE_TEST_WIBBLE_EVENT,
+ NULL,
+};
+
+static void trace_testsuite_register_events(void)
+{
+ trace_event_register_group(testsuite_trace_events);
+}
+trace_init(trace_testsuite_register_events)
+#include "qemu/osdep.h"
+#include "trace/control.h"
+#include "trace/simple.h"
+
+void _simple_trace_test_blah(void *context, const char *filename)
+{
+ TraceBufferRecord rec;
+ size_t argfilename_len = filename ? MIN(strlen(filename), MAX_TRACE_STRLEN) : 0;
+
+ if (trace_record_start(&rec, _TRACE_TEST_BLAH_EVENT.id, 8 + 4 + argfilename_len)) {
+ return; /* Trace Buffer Full, Event Dropped ! */
+ }
+ trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)context);
+ trace_record_write_str(&rec, filename, argfilename_len);
+ trace_record_finish(&rec);
+}
+
+void _simple_trace_test_wibble(void *context, int value)
+{
+ TraceBufferRecord rec;
+
+ if (trace_record_start(&rec, _TRACE_TEST_WIBBLE_EVENT.id, 8 + 8)) {
+ return; /* Trace Buffer Full, Event Dropped ! */
+ }
+ trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)context);
+ trace_record_write_u64(&rec, (uint64_t)value);
+ trace_record_finish(&rec);
+}
+
diff --git a/tests/tracetool/all.d b/tests/tracetool/all.d
new file mode 100644
index 00000000000..5cc06f9f4f5
--- /dev/null
+++ b/tests/tracetool/all.d
@@ -0,0 +1,10 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+provider qemu {
+
+probe test_blah(void * context,const char * filename);
+
+probe test_wibble(void * context,int value);
+
+};
diff --git a/tests/tracetool/all.h b/tests/tracetool/all.h
new file mode 100644
index 00000000000..41fa4d0e8a2
--- /dev/null
+++ b/tests/tracetool/all.h
@@ -0,0 +1,102 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef TRACE_TESTSUITE_GENERATED_TRACERS_H
+#define TRACE_TESTSUITE_GENERATED_TRACERS_H
+
+#include "trace/control.h"
+
+extern TraceEvent _TRACE_TEST_BLAH_EVENT;
+extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
+extern uint8_t _TRACE_TEST_BLAH_DSTATE;
+extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
+#define TRACE_TEST_BLAH_ENABLED 1
+#define TRACE_TEST_WIBBLE_ENABLED 1
+#ifndef SDT_USE_VARIADIC
+#define SDT_USE_VARIADIC 1
+#endif
+#include "trace-dtrace-testsuite.h"
+
+#undef SDT_USE_VARIADIC
+#ifndef QEMU_TEST_BLAH_ENABLED
+#define QEMU_TEST_BLAH_ENABLED() true
+#endif
+#ifndef QEMU_TEST_WIBBLE_ENABLED
+#define QEMU_TEST_WIBBLE_ENABLED() true
+#endif
+#include "trace/ftrace.h"
+
+#include "qemu/log-for-trace.h"
+
+void _simple_trace_test_blah(void *context, const char *filename);
+void _simple_trace_test_wibble(void *context, int value);
+
+#include <syslog.h>
+
+#include <lttng/tracepoint.h>
+#include "trace-ust-testsuite.h"
+
+/* tracepoint_enabled() was introduced in LTTng UST 2.7 */
+#ifndef tracepoint_enabled
+#define tracepoint_enabled(a, b) true
+#endif
+
+
+#define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
+ QEMU_TEST_BLAH_ENABLED() || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
+ tracepoint_enabled(qemu, test_blah) || \
+ false)
+
+static inline void trace_test_blah(void *context, const char *filename)
+{
+ QEMU_TEST_BLAH(context, filename);
+ tracepoint(qemu, test_blah, context, filename);
+ if (trace_event_get_state(TRACE_TEST_BLAH)) {
+#line 4 "trace-events"
+ ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
+#line 62 "all.h"
+ if (qemu_loglevel_mask(LOG_TRACE)) {
+#line 4 "trace-events"
+ qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
+#line 66 "all.h"
+ }
+ _simple_trace_test_blah(context, filename);
+#line 4 "trace-events"
+ syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
+#line 71 "all.h"
+ }
+}
+
+#define TRACE_TEST_WIBBLE_BACKEND_DSTATE() ( \
+ QEMU_TEST_WIBBLE_ENABLED() || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
+ trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
+ tracepoint_enabled(qemu, test_wibble) || \
+ false)
+
+static inline void trace_test_wibble(void *context, int value)
+{
+ QEMU_TEST_WIBBLE(context, value);
+ tracepoint(qemu, test_wibble, context, value);
+ if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+#line 5 "trace-events"
+ ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
+#line 91 "all.h"
+ if (qemu_loglevel_mask(LOG_TRACE)) {
+#line 5 "trace-events"
+ qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
+#line 95 "all.h"
+ }
+ _simple_trace_test_wibble(context, value);
+#line 5 "trace-events"
+ syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
+#line 100 "all.h"
+ }
+}
+#endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/all.log-stap b/tests/tracetool/all.log-stap
new file mode 100644
index 00000000000..092986e0b61
--- /dev/null
+++ b/tests/tracetool/all.log-stap
@@ -0,0 +1,15 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+probe qemu.log.test_blah = qemu.test_blah ?
+{
+ try {
+ argfilename_str = filename ? user_string_n(filename, 512) : "<null>"
+ } catch {}
+ printf("%d@%d test_blah Blah context=%p filename=%s\n", pid(), gettimeofday_ns(), context, argfilename_str)
+}
+probe qemu.log.test_wibble = qemu.test_wibble ?
+{
+ printf("%d@%d test_wibble Wibble context=%p value=%d\n", pid(), gettimeofday_ns(), context, value)
+}
+
diff --git a/tests/tracetool/all.rs b/tests/tracetool/all.rs
new file mode 100644
index 00000000000..c8c9d288366
--- /dev/null
+++ b/tests/tracetool/all.rs
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// This file is @generated by tracetool, do not edit.
+
+#[allow(unused_imports)]
+use std::ffi::c_char;
+#[allow(unused_imports)]
+use util::bindings;
+
+#[allow(dead_code)]
+#[inline(always)]
+fn trace_event_state_is_enabled(dstate: u8) -> bool {
+ (unsafe { trace_events_enabled_count }) != 0 && dstate != 0
+}
+
+extern "C" {
+ #[allow(dead_code)]
+ static mut trace_events_enabled_count: u32;
+}
+extern "C" {
+ #[allow(dead_code)]
+ static mut _TRACE_TEST_BLAH_DSTATE: u8;
+ #[allow(dead_code)]
+ static mut _TRACE_TEST_WIBBLE_DSTATE: u8;
+}
+
+use std::cell::UnsafeCell;
+
+extern "C" {
+ #[allow(dead_code)]
+ static qemu_test_blah_semaphore: UnsafeCell<u16>;
+ #[allow(dead_code)]
+ static qemu_test_wibble_semaphore: UnsafeCell<u16>;
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_blah_enabled() -> bool
+{
+ (unsafe {qemu_test_blah_semaphore.get().read_volatile()}) != 0 ||
+ trace_event_state_is_enabled(unsafe { _TRACE_TEST_BLAH_DSTATE}) ||
+ false
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_blah(_context: *mut (), _filename: &std::ffi::CStr)
+{
+ ::trace::probe!(qemu, test_blah, _context, _filename.as_ptr());
+ if trace_event_state_is_enabled(unsafe { _TRACE_TEST_BLAH_DSTATE}) {
+ let format_string = c"Blah context=%p filename=%s";
+ unsafe {bindings::ftrace_write(format_string.as_ptr() as *const c_char, _context /* as *mut () */, _filename.as_ptr());}
+ let format_string = c"test_blah Blah context=%p filename=%s\n";
+ if (unsafe { bindings::qemu_loglevel } & bindings::LOG_TRACE) != 0 {
+ unsafe { bindings::qemu_log(format_string.as_ptr() as *const c_char, _context /* as *mut () */, _filename.as_ptr());}
+ }
+ extern "C" { fn _simple_trace_test_blah(_context: *mut (), _filename: *const std::ffi::c_char); }
+ unsafe { _simple_trace_test_blah(_context, _filename.as_ptr()); }
+ let format_string = c"Blah context=%p filename=%s";
+ unsafe {::trace::syslog(::trace::LOG_INFO, format_string.as_ptr() as *const c_char, _context /* as *mut () */, _filename.as_ptr());}
+ }
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_wibble_enabled() -> bool
+{
+ (unsafe {qemu_test_wibble_semaphore.get().read_volatile()}) != 0 ||
+ trace_event_state_is_enabled(unsafe { _TRACE_TEST_WIBBLE_DSTATE}) ||
+ false
+}
+
+#[inline(always)]
+#[allow(dead_code)]
+pub fn trace_test_wibble(_context: *mut (), _value: std::ffi::c_int)
+{
+ ::trace::probe!(qemu, test_wibble, _context, _value);
+ if trace_event_state_is_enabled(unsafe { _TRACE_TEST_WIBBLE_DSTATE}) {
+ let format_string = c"Wibble context=%p value=%d";
+ unsafe {bindings::ftrace_write(format_string.as_ptr() as *const c_char, _context /* as *mut () */, _value /* as std::ffi::c_int */);}
+ let format_string = c"test_wibble Wibble context=%p value=%d\n";
+ if (unsafe { bindings::qemu_loglevel } & bindings::LOG_TRACE) != 0 {
+ unsafe { bindings::qemu_log(format_string.as_ptr() as *const c_char, _context /* as *mut () */, _value /* as std::ffi::c_int */);}
+ }
+ extern "C" { fn _simple_trace_test_wibble(_context: *mut (), _value: std::ffi::c_int); }
+ unsafe { _simple_trace_test_wibble(_context, _value); }
+ let format_string = c"Wibble context=%p value=%d";
+ unsafe {::trace::syslog(::trace::LOG_INFO, format_string.as_ptr() as *const c_char, _context /* as *mut () */, _value /* as std::ffi::c_int */);}
+ }
+}
+
diff --git a/tests/tracetool/all.simpletrace-stap b/tests/tracetool/all.simpletrace-stap
new file mode 100644
index 00000000000..d064e3e286a
--- /dev/null
+++ b/tests/tracetool/all.simpletrace-stap
@@ -0,0 +1,16 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+probe qemu.simpletrace.test_blah = qemu.test_blah ?
+{
+ try {
+ argfilename_str = filename ? user_string_n(filename, 512) : "<null>"
+ } catch {}
+ argfilename_len = strlen(argfilename_str)
+ printf("%8b%8b%8b%4b%4b%8b%4b%.*s", 1, 0, gettimeofday_ns(), 24 + 8 + 4 + argfilename_len, pid(), context, argfilename_len, argfilename_len, argfilename_str)
+}
+probe qemu.simpletrace.test_wibble = qemu.test_wibble ?
+{
+ printf("%8b%8b%8b%4b%4b%8b%8b", 1, 1, gettimeofday_ns(), 24 + 8 + 8, pid(), context, value)
+}
+
diff --git a/tests/tracetool/all.stap b/tests/tracetool/all.stap
new file mode 100644
index 00000000000..9c5d8a527ce
--- /dev/null
+++ b/tests/tracetool/all.stap
@@ -0,0 +1,14 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+probe qemu.test_blah = process("qemu").mark("test_blah")
+{
+ context = $arg1;
+ filename = $arg2;
+}
+probe qemu.test_wibble = process("qemu").mark("test_wibble")
+{
+ context = $arg1;
+ value = $arg2;
+}
+
diff --git a/tests/tracetool/all.ust-events-c b/tests/tracetool/all.ust-events-c
new file mode 100644
index 00000000000..db232240568
--- /dev/null
+++ b/tests/tracetool/all.ust-events-c
@@ -0,0 +1,14 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "qemu/osdep.h"
+
+#define TRACEPOINT_DEFINE
+#define TRACEPOINT_CREATE_PROBES
+
+/* If gcc version 4.7 or older is used, LTTng ust gives a warning when compiling with
+ -Wredundant-decls.
+ */
+#pragma GCC diagnostic ignored "-Wredundant-decls"
+
+#include "trace-ust-all.h"
diff --git a/tests/tracetool/all.ust-events-h b/tests/tracetool/all.ust-events-h
new file mode 100644
index 00000000000..4621a995fc1
--- /dev/null
+++ b/tests/tracetool/all.ust-events-h
@@ -0,0 +1,56 @@
+/* This file is autogenerated by tracetool, do not edit. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#undef TRACEPOINT_PROVIDER
+#define TRACEPOINT_PROVIDER qemu
+
+#undef TRACEPOINT_INCLUDE
+#define TRACEPOINT_INCLUDE "./trace-ust.h"
+
+#if !defined (TRACE_TESTSUITE_GENERATED_UST_H) || \
+ defined(TRACEPOINT_HEADER_MULTI_READ)
+#define TRACE_TESTSUITE_GENERATED_UST_H
+
+#include <lttng/tracepoint.h>
+
+/*
+ * LTTng ust 2.0 does not allow you to use TP_ARGS(void) for tracepoints
+ * requiring no arguments. We define these macros introduced in more recent * versions of LTTng ust as a workaround
+ */
+#ifndef _TP_EXPROTO1
+#define _TP_EXPROTO1(a) void
+#endif
+#ifndef _TP_EXDATA_PROTO1
+#define _TP_EXDATA_PROTO1(a) void *__tp_data
+#endif
+#ifndef _TP_EXDATA_VAR1
+#define _TP_EXDATA_VAR1(a) __tp_data
+#endif
+#ifndef _TP_EXVAR1
+#define _TP_EXVAR1(a)
+#endif
+
+TRACEPOINT_EVENT(
+ qemu,
+ test_blah,
+ TP_ARGS(void *, context, const char *, filename),
+ TP_FIELDS(
+ ctf_integer_hex(void *, context, context)
+ ctf_string(filename, filename)
+ )
+)
+
+TRACEPOINT_EVENT(
+ qemu,
+ test_wibble,
+ TP_ARGS(void *, context, int, value),
+ TP_FIELDS(
+ ctf_integer_hex(void *, context, context)
+ ctf_integer(int, value, value)
+ )
+)
+
+#endif /* TRACE_TESTSUITE_GENERATED_UST_H */
+
+/* This part must be outside ifdef protection */
+#include <lttng/tracepoint-event.h>
diff --git a/tests/tracetool/meson.build b/tests/tracetool/meson.build
index f4f583e6224..b024dc6e405 100644
--- a/tests/tracetool/meson.build
+++ b/tests/tracetool/meson.build
@@ -11,7 +11,8 @@ backends = [
'log',
'simple',
'syslog',
- 'ust'
+ 'ust',
+ 'all'
]
# The tracetool-test.py program has portability problems on Windows.
diff --git a/tests/tracetool/tracetool-test.py b/tests/tracetool/tracetool-test.py
index 74f315a4629..2f6328e68c3 100755
--- a/tests/tracetool/tracetool-test.py
+++ b/tests/tracetool/tracetool-test.py
@@ -14,16 +14,16 @@ def get_formats(backend):
"c",
"h",
]
- if backend in {"nop", "dtrace", "ftrace", "log", "simple", "syslog"}:
+ if backend in {"nop", "dtrace", "ftrace", "log", "simple", "syslog", "all"}:
formats += ["rs"]
- if backend == "dtrace":
+ if backend in {"dtrace", "all"}:
formats += [
"d",
"log-stap",
"simpletrace-stap",
"stap",
]
- if backend == "ust":
+ if backend in {"ust", "all"}:
formats += [
"ust-events-c",
"ust-events-h",
@@ -36,8 +36,12 @@ def test_tracetool_one(tracetool, backend, fmt, src_dir, build_dir):
actual_file = Path(build_dir, rel_filename)
expect_file = Path(src_dir, rel_filename)
+ backends = backend
+ if backends == "all":
+ backends = "dtrace,ftrace,log,simple,syslog,ust"
+
args = [sys.executable, tracetool,
- f"--format={fmt}", f"--backends={backend}", "--group=testsuite"]
+ f"--format={fmt}", f"--backends={backends}", "--group=testsuite"]
if fmt.find("stap") != -1:
args += ["--binary=qemu", "--probe-prefix=qemu"]
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 13/20] trace: remove redundant headers from simple trace backend code
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (11 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 12/20] trace: add test of generation with all backends enabled Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 14/20] audio: remove mistaken use of trace_event_get_state() Daniel P. Berrangé
` (7 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The main formatter for .h/.c files for generated trace code
already includes osdep.h and control.h, so it is redundant
for the simple trace backend to add them too.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/backend/simple.py | 4 +---
tests/tracetool/all.c | 2 --
tests/tracetool/simple.c | 2 --
3 files changed, 1 insertion(+), 7 deletions(-)
diff --git a/scripts/tracetool/backend/simple.py b/scripts/tracetool/backend/simple.py
index b131e4fc194..e22683c7d2a 100644
--- a/scripts/tracetool/backend/simple.py
+++ b/scripts/tracetool/backend/simple.py
@@ -48,9 +48,7 @@ def generate_h_backend_dstate(event, group):
def generate_c_begin(events, group):
- out('#include "qemu/osdep.h"',
- '#include "trace/control.h"',
- '#include "trace/simple.h"',
+ out('#include "trace/simple.h"',
'')
diff --git a/tests/tracetool/all.c b/tests/tracetool/all.c
index 820ddb575b0..3b8d4d32d17 100644
--- a/tests/tracetool/all.c
+++ b/tests/tracetool/all.c
@@ -34,8 +34,6 @@ static void trace_testsuite_register_events(void)
trace_event_register_group(testsuite_trace_events);
}
trace_init(trace_testsuite_register_events)
-#include "qemu/osdep.h"
-#include "trace/control.h"
#include "trace/simple.h"
void _simple_trace_test_blah(void *context, const char *filename)
diff --git a/tests/tracetool/simple.c b/tests/tracetool/simple.c
index 820ddb575b0..3b8d4d32d17 100644
--- a/tests/tracetool/simple.c
+++ b/tests/tracetool/simple.c
@@ -34,8 +34,6 @@ static void trace_testsuite_register_events(void)
trace_event_register_group(testsuite_trace_events);
}
trace_init(trace_testsuite_register_events)
-#include "qemu/osdep.h"
-#include "trace/control.h"
#include "trace/simple.h"
void _simple_trace_test_blah(void *context, const char *filename)
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 14/20] audio: remove mistaken use of trace_event_get_state()
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (12 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 13/20] trace: remove redundant headers from simple trace backend code Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 18:00 ` Philippe Mathieu-Daudé
2026-10-01 19:14 ` marcandre.lureau
2026-10-01 15:12 ` [PATCH 15/20] hw/ppc: " Daniel P. Berrangé
` (6 subsequent siblings)
20 siblings, 2 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
Conditional checks must call trace_event_get_state_dynamic()
which checks the state of all backends, while trace_event_get_state()
only validates state for backends using QEMU's internal state
tracking.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
audio/audio-mixeng-be.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/audio/audio-mixeng-be.c b/audio/audio-mixeng-be.c
index f7d73d85608..60a4007817c 100644
--- a/audio/audio-mixeng-be.c
+++ b/audio/audio-mixeng-be.c
@@ -1179,7 +1179,7 @@ void audio_run(AudioMixengBackend *s, const char *msg)
audio_run_in(s);
audio_run_capture(s);
- if (trace_event_get_state(TRACE_AUDIO_RUN_POLL)) {
+ if (trace_event_get_state_backends(TRACE_AUDIO_RUN_POLL)) {
/* Convert seconds to microseconds for trace event */
int64_t elapsed_us = g_timer_elapsed(s->run_timer, NULL) * MICROSECONDS_PER_SECOND;
trace_audio_run_poll(msg, elapsed_us);
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* Re: [PATCH 14/20] audio: remove mistaken use of trace_event_get_state()
2026-10-01 15:12 ` [PATCH 14/20] audio: remove mistaken use of trace_event_get_state() Daniel P. Berrangé
@ 2026-10-01 18:00 ` Philippe Mathieu-Daudé
2026-10-01 19:14 ` marcandre.lureau
1 sibling, 0 replies; 34+ messages in thread
From: Philippe Mathieu-Daudé @ 2026-10-01 18:00 UTC (permalink / raw)
To: Daniel P. Berrangé, qemu-devel; +Cc: Stefan Hajnoczi
On 2026-10-01 17:12, Daniel P. Berrangé wrote:
> Conditional checks must call trace_event_get_state_dynamic()
> which checks the state of all backends, while trace_event_get_state()
> only validates state for backends using QEMU's internal state
> tracking.
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
> audio/audio-mixeng-be.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH 14/20] audio: remove mistaken use of trace_event_get_state()
2026-10-01 15:12 ` [PATCH 14/20] audio: remove mistaken use of trace_event_get_state() Daniel P. Berrangé
2026-10-01 18:00 ` Philippe Mathieu-Daudé
@ 2026-10-01 19:14 ` marcandre.lureau
2026-10-02 7:12 ` Daniel P. Berrangé
1 sibling, 1 reply; 34+ messages in thread
From: marcandre.lureau @ 2026-10-01 19:14 UTC (permalink / raw)
To: Daniel P. Berrangé; +Cc: qemu-devel, Stefan Hajnoczi
> Conditional checks must call trace_event_get_state_dynamic()
get_state_backends()?
> which checks the state of all backends, while trace_event_get_state()
> only validates state for backends using QEMU's internal state
> tracking.
I don't understand, tbh, but the doc & tracing.rst agree so,
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
--
Marc-André Lureau <marcandre.lureau@redhat.com>
^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH 14/20] audio: remove mistaken use of trace_event_get_state()
2026-10-01 19:14 ` marcandre.lureau
@ 2026-10-02 7:12 ` Daniel P. Berrangé
0 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-02 7:12 UTC (permalink / raw)
To: marcandre.lureau; +Cc: qemu-devel, Stefan Hajnoczi
On Thu, Oct 01, 2026 at 11:14:36PM +0400, marcandre.lureau@redhat.com wrote:
> > Conditional checks must call trace_event_get_state_dynamic()
>
> get_state_backends()?
Opps, yes.
> > which checks the state of all backends, while trace_event_get_state()
> > only validates state for backends using QEMU's internal state
> > tracking.
>
> I don't understand, tbh, but the doc & tracing.rst agree so,
We have a "uint16_t _TRACE....DSTATE" variable for each probe that
tracks whether QEMU has marked it enabled or not. This is used
to control the ftrace, syslog, log and simple trace backends, and
what the -trace command line arg sets. This is what the
trace_event_get_state() macro checks.
For the systemtap and ust backends, however, that variable is not
used, as they use USDT which are dynamically enabled by the external
tracing application. They proide a semaphore which can be checked
to see if the USDT has been enabled.
The "TRACE...DSTATE()" macro (no leading underscore) expands to
code that checks the systemtap/ust USDT semaphores *and* the
QEMU "_TRACE...DSTATE" variable. This is what the correct
trace_event_get_state_backends() macro checks, and thus what
needs to be used to ensure things work with dtrace/ust backends,
as well as the QEMU internal backends.
> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
With regards,
Daniel
--
|: https://berrange.com ~~ https://hachyderm.io/@berrange :|
|: https://libvirt.org ~~ https://entangle-photo.org :|
|: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|
^ permalink raw reply [flat|nested] 34+ messages in thread
* [PATCH 15/20] hw/ppc: remove mistaken use of trace_event_get_state()
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (13 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 14/20] audio: remove mistaken use of trace_event_get_state() Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 18:01 ` Philippe Mathieu-Daudé
2026-10-01 15:12 ` [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard Daniel P. Berrangé
` (5 subsequent siblings)
20 siblings, 1 reply; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
Conditional checks must call trace_event_get_state_dynamic()
which checks the state of all backends, while trace_event_get_state()
only validates state for backends using QEMU's internal state
tracking.
Furthermore, checking qemu_loglevel_mask() is inappropriate since
there are many trace backends, of which 'log' is only one.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
hw/ppc/vof.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/hw/ppc/vof.c b/hw/ppc/vof.c
index 873e967f1e4..e2ff9bf96a3 100644
--- a/hw/ppc/vof.c
+++ b/hw/ppc/vof.c
@@ -252,8 +252,7 @@ static uint32_t vof_getprop(const void *fdt, uint32_t nodeph, uint32_t pname,
*/
ret = proplen;
/* Do not format a value if tracepoint is silent, for performance */
- if (trace_event_get_state(TRACE_VOF_GETPROP) &&
- qemu_loglevel_mask(LOG_TRACE)) {
+ if (trace_event_get_state_backends(TRACE_VOF_GETPROP)) {
prop_format(trval, sizeof(trval), prop, ret);
}
}
@@ -337,8 +336,7 @@ static uint32_t vof_setprop(MachineState *ms, void *fdt, Vof *vof,
goto trace_exit;
}
- if (trace_event_get_state(TRACE_VOF_SETPROP) &&
- qemu_loglevel_mask(LOG_TRACE)) {
+ if (trace_event_get_state_backends(TRACE_VOF_SETPROP)) {
prop_format(trval, sizeof(trval), val, vallen);
}
ret = vallen;
@@ -584,8 +582,7 @@ static uint32_t vof_write(Vof *vof, uint32_t ihandle, uint32_t buf,
}
/* FIXME: there is no backend(s) yet so just call a trace */
- if (trace_event_get_state(TRACE_VOF_WRITE) &&
- qemu_loglevel_mask(LOG_TRACE)) {
+ if (trace_event_get_state_backends(TRACE_VOF_WRITE)) {
tmp[cb] = '\0';
trace_vof_write(ihandle, cb, tmp);
}
@@ -599,9 +596,7 @@ static void vof_claimed_dump(GArray *claimed)
int i;
OfClaimed c;
- if (trace_event_get_state(TRACE_VOF_CLAIMED) &&
- qemu_loglevel_mask(LOG_TRACE)) {
-
+ if (trace_event_get_state_backends(TRACE_VOF_CLAIMED)) {
for (i = 0; i < claimed->len; ++i) {
c = g_array_index(claimed, OfClaimed, i);
trace_vof_claimed(c.start, c.start + c.size, c.size);
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* Re: [PATCH 15/20] hw/ppc: remove mistaken use of trace_event_get_state()
2026-10-01 15:12 ` [PATCH 15/20] hw/ppc: " Daniel P. Berrangé
@ 2026-10-01 18:01 ` Philippe Mathieu-Daudé
0 siblings, 0 replies; 34+ messages in thread
From: Philippe Mathieu-Daudé @ 2026-10-01 18:01 UTC (permalink / raw)
To: Daniel P. Berrangé, qemu-devel; +Cc: Stefan Hajnoczi
On 2026-10-01 17:12, Daniel P. Berrangé wrote:
> Conditional checks must call trace_event_get_state_dynamic()
> which checks the state of all backends, while trace_event_get_state()
> only validates state for backends using QEMU's internal state
> tracking.
>
> Furthermore, checking qemu_loglevel_mask() is inappropriate since
> there are many trace backends, of which 'log' is only one.
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
> hw/ppc/vof.c | 13 ++++---------
> 1 file changed, 4 insertions(+), 9 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
^ permalink raw reply [flat|nested] 34+ messages in thread
* [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (14 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 15/20] hw/ppc: " Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-02 10:45 ` Paolo Bonzini
2026-10-01 15:12 ` [PATCH 17/20] trace: remove "disable" property from trace files Daniel P. Berrangé
` (4 subsequent siblings)
20 siblings, 1 reply; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
If emitting a trace event requires computation for the parameters
passed to the probe, the callers should guard that computation
with trace_event_by_state_backends(), which is a macro expanding
to the a check of the "TRACE_...._DSTATE()" expression. For the
log backend this should include a check for LOG_TRACE being
present in the configured log level.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/backend/log.py | 3 ++-
tests/tracetool/all.h | 6 ++++--
tests/tracetool/log.h | 6 ++++--
3 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/scripts/tracetool/backend/log.py b/scripts/tracetool/backend/log.py
index 9e3e5046f5f..7834e5b0d40 100644
--- a/scripts/tracetool/backend/log.py
+++ b/scripts/tracetool/backend/log.py
@@ -42,7 +42,8 @@ def generate_h(event, group):
def generate_h_backend_dstate(event, group):
- out(' trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
+ out(' (trace_event_get_state_dynamic_by_id(%(event_id)s) && \\\n'
+ ' qemu_loglevel_mask(LOG_TRACE)) || \\',
event_id="TRACE_" + event.name.upper())
def generate_rs(event, group):
diff --git a/tests/tracetool/all.h b/tests/tracetool/all.h
index 41fa4d0e8a2..a2c2d40388e 100644
--- a/tests/tracetool/all.h
+++ b/tests/tracetool/all.h
@@ -45,7 +45,8 @@ void _simple_trace_test_wibble(void *context, int value);
#define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
QEMU_TEST_BLAH_ENABLED() || \
trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
- trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
+ (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) && \
+ qemu_loglevel_mask(LOG_TRACE)) || \
trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
tracepoint_enabled(qemu, test_blah) || \
@@ -74,7 +75,8 @@ static inline void trace_test_blah(void *context, const char *filename)
#define TRACE_TEST_WIBBLE_BACKEND_DSTATE() ( \
QEMU_TEST_WIBBLE_ENABLED() || \
trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
- trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
+ (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) && \
+ qemu_loglevel_mask(LOG_TRACE)) || \
trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
tracepoint_enabled(qemu, test_wibble) || \
diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
index ff510d54908..fe08277887f 100644
--- a/tests/tracetool/log.h
+++ b/tests/tracetool/log.h
@@ -16,7 +16,8 @@ extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
#define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
- trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) || \
+ (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH) && \
+ qemu_loglevel_mask(LOG_TRACE)) || \
false)
static inline void trace_test_blah(void *context, const char *filename)
@@ -31,7 +32,8 @@ static inline void trace_test_blah(void *context, const char *filename)
}
#define TRACE_TEST_WIBBLE_BACKEND_DSTATE() ( \
- trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) || \
+ (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE) && \
+ qemu_loglevel_mask(LOG_TRACE)) || \
false)
static inline void trace_test_wibble(void *context, int value)
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* Re: [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard
2026-10-01 15:12 ` [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard Daniel P. Berrangé
@ 2026-10-02 10:45 ` Paolo Bonzini
2026-10-02 11:03 ` Daniel P. Berrangé
0 siblings, 1 reply; 34+ messages in thread
From: Paolo Bonzini @ 2026-10-02 10:45 UTC (permalink / raw)
To: Daniel P. Berrangé, qemu-devel; +Cc: Stefan Hajnoczi
On 10/1/26 17:12, Daniel P. Berrangé wrote:
> If emitting a trace event requires computation for the parameters
> passed to the probe, the callers should guard that computation
> with trace_event_by_state_backends(), which is a macro expanding
> to the a check of the "TRACE_...._DSTATE()" expression. For the
> log backend this should include a check for LOG_TRACE being
> present in the configured log level.
This also needs something for Rust (apologies for the mailer damage):
--- a/scripts/tracetool/backend/log.py
+++ b/scripts/tracetool/backend/log.py
@@ -16,7 +16,6 @@
PUBLIC = True
-CHECK_TRACE_EVENT_GET_STATE = True
def generate_h_begin(events, group):
@@ -52,3 +51,9 @@ def generate_rs(event, group):
' }',
fmt=expand_format_string(event.fmt, event.name + " "),
args=event.args.rust_call_varargs())
+
+def generate_rs_backend_dstate(event, group):
+ out(' unsafe { (bindings::qemu_loglevel & bindings::LOG_TRACE)
!= 0 && '
+ + 'trace_event_state_is_enabled(_%(event_id)s_DSTATE) } ||',
+ event_id = 'TRACE_' + e.name.upper())
+
Paolo
^ permalink raw reply [flat|nested] 34+ messages in thread* Re: [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard
2026-10-02 10:45 ` Paolo Bonzini
@ 2026-10-02 11:03 ` Daniel P. Berrangé
2026-10-02 14:49 ` Paolo Bonzini
0 siblings, 1 reply; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-02 11:03 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, Stefan Hajnoczi
On Fri, Oct 02, 2026 at 12:45:49PM +0200, Paolo Bonzini wrote:
> On 10/1/26 17:12, Daniel P. Berrangé wrote:
> > If emitting a trace event requires computation for the parameters
> > passed to the probe, the callers should guard that computation
> > with trace_event_by_state_backends(), which is a macro expanding
> > to the a check of the "TRACE_...._DSTATE()" expression. For the
> > log backend this should include a check for LOG_TRACE being
> > present in the configured log level.
> This also needs something for Rust (apologies for the mailer damage):
Ok, I'll test that and include it in a future v3, since I already
sent out v2 before seeing this.
> --- a/scripts/tracetool/backend/log.py
> +++ b/scripts/tracetool/backend/log.py
> @@ -16,7 +16,6 @@
>
>
> PUBLIC = True
> -CHECK_TRACE_EVENT_GET_STATE = True
>
>
> def generate_h_begin(events, group):
> @@ -52,3 +51,9 @@ def generate_rs(event, group):
> ' }',
> fmt=expand_format_string(event.fmt, event.name + " "),
> args=event.args.rust_call_varargs())
> +
> +def generate_rs_backend_dstate(event, group):
> + out(' unsafe { (bindings::qemu_loglevel & bindings::LOG_TRACE) != 0
> && '
> + + 'trace_event_state_is_enabled(_%(event_id)s_DSTATE) } ||',
> + event_id = 'TRACE_' + e.name.upper())
> +
>
> Paolo
>
With regards,
Daniel
--
|: https://berrange.com ~~ https://hachyderm.io/@berrange :|
|: https://libvirt.org ~~ https://entangle-photo.org :|
|: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|
^ permalink raw reply [flat|nested] 34+ messages in thread* Re: [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard
2026-10-02 11:03 ` Daniel P. Berrangé
@ 2026-10-02 14:49 ` Paolo Bonzini
2026-10-05 12:08 ` Daniel P. Berrangé
0 siblings, 1 reply; 34+ messages in thread
From: Paolo Bonzini @ 2026-10-02 14:49 UTC (permalink / raw)
To: Daniel P. Berrangé; +Cc: qemu-devel, Stefan Hajnoczi
[-- Attachment #1: Type: text/plain, Size: 1847 bytes --]
Il ven 2 ott 2026, 13:04 Daniel P. Berrangé <berrange@redhat.com> ha
scritto:
> On Fri, Oct 02, 2026 at 12:45:49PM +0200, Paolo Bonzini wrote:
> > On 10/1/26 17:12, Daniel P. Berrangé wrote:
> > > If emitting a trace event requires computation for the parameters
> > > passed to the probe, the callers should guard that computation
> > > with trace_event_by_state_backends(), which is a macro expanding
> > > to the a check of the "TRACE_...._DSTATE()" expression. For the
> > > log backend this should include a check for LOG_TRACE being
> > > present in the configured log level.
> > This also needs something for Rust (apologies for the mailer damage):
>
> Ok, I'll test that and include it in a future v3, since I already
> sent out v2 before seeing this.
>
No hurry, it's just an optimization.
Paolo
> --- a/scripts/tracetool/backend/log.py
> > +++ b/scripts/tracetool/backend/log.py
> > @@ -16,7 +16,6 @@
> >
> >
> > PUBLIC = True
> > -CHECK_TRACE_EVENT_GET_STATE = True
> >
> >
> > def generate_h_begin(events, group):
> > @@ -52,3 +51,9 @@ def generate_rs(event, group):
> > ' }',
> > fmt=expand_format_string(event.fmt, event.name + " "),
> > args=event.args.rust_call_varargs())
> > +
> > +def generate_rs_backend_dstate(event, group):
> > + out(' unsafe { (bindings::qemu_loglevel & bindings::LOG_TRACE)
> != 0
> > && '
> > + + 'trace_event_state_is_enabled(_%(event_id)s_DSTATE) } ||',
> > + event_id = 'TRACE_' + e.name.upper())
> > +
> >
> > Paolo
> >
>
> With regards,
> Daniel
> --
> |: https://berrange.com ~~ https://hachyderm.io/@berrange :|
> |: https://libvirt.org ~~ https://entangle-photo.org :|
> |: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|
>
>
[-- Attachment #2: Type: text/html, Size: 3399 bytes --]
^ permalink raw reply [flat|nested] 34+ messages in thread* Re: [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard
2026-10-02 14:49 ` Paolo Bonzini
@ 2026-10-05 12:08 ` Daniel P. Berrangé
0 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-05 12:08 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, Stefan Hajnoczi
On Fri, Oct 02, 2026 at 04:49:19PM +0200, Paolo Bonzini wrote:
> Il ven 2 ott 2026, 13:04 Daniel P. Berrangé <berrange@redhat.com> ha
> scritto:
>
> > On Fri, Oct 02, 2026 at 12:45:49PM +0200, Paolo Bonzini wrote:
> > > On 10/1/26 17:12, Daniel P. Berrangé wrote:
> > > > If emitting a trace event requires computation for the parameters
> > > > passed to the probe, the callers should guard that computation
> > > > with trace_event_by_state_backends(), which is a macro expanding
> > > > to the a check of the "TRACE_...._DSTATE()" expression. For the
> > > > log backend this should include a check for LOG_TRACE being
> > > > present in the configured log level.
> > > This also needs something for Rust (apologies for the mailer damage):
> >
> > Ok, I'll test that and include it in a future v3, since I already
> > sent out v2 before seeing this.
> >
>
> No hurry, it's just an optimization.
Trying your suggested patch exposed an existing bug in the code, where we
did not merge the checks in the C code, and this was only apparent once
removing the CHECK_TRACE_EVENT_GET_STATE flag. So I've fixed this all in
the v3 posting.
>
> Paolo
>
> > --- a/scripts/tracetool/backend/log.py
> > > +++ b/scripts/tracetool/backend/log.py
> > > @@ -16,7 +16,6 @@
> > >
> > >
> > > PUBLIC = True
> > > -CHECK_TRACE_EVENT_GET_STATE = True
> > >
> > >
> > > def generate_h_begin(events, group):
> > > @@ -52,3 +51,9 @@ def generate_rs(event, group):
> > > ' }',
> > > fmt=expand_format_string(event.fmt, event.name + " "),
> > > args=event.args.rust_call_varargs())
> > > +
> > > +def generate_rs_backend_dstate(event, group):
> > > + out(' unsafe { (bindings::qemu_loglevel & bindings::LOG_TRACE)
> > != 0
> > > && '
> > > + + 'trace_event_state_is_enabled(_%(event_id)s_DSTATE) } ||',
> > > + event_id = 'TRACE_' + e.name.upper())
> > > +
> > >
> > > Paolo
> > >
> >
> > With regards,
> > Daniel
> > --
> > |: https://berrange.com ~~ https://hachyderm.io/@berrange :|
> > |: https://libvirt.org ~~ https://entangle-photo.org :|
> > |: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|
> >
> >
With regards,
Daniel
--
|: https://berrange.com ~~ https://hachyderm.io/@berrange :|
|: https://libvirt.org ~~ https://entangle-photo.org :|
|: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|
^ permalink raw reply [flat|nested] 34+ messages in thread
* [PATCH 17/20] trace: remove "disable" property from trace files
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (15 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 16/20] trace: include qemu_loglevel_mask(LOG_TRACE) in guard Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 18/20] trace: stop tracking static disabled state Daniel P. Berrangé
` (3 subsequent siblings)
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The scenarios are not significant enough to justify its use
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
hw/display/trace-events | 2 +-
target/hppa/trace-events | 28 ++++++++++++++--------------
2 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/hw/display/trace-events b/hw/display/trace-events
index c5e7e42af23..223a085922b 100644
--- a/hw/display/trace-events
+++ b/hw/display/trace-events
@@ -60,7 +60,7 @@ virtio_gpu_dec_inflight_fences(uint32_t inflight) "in-flight- %u"
virtio_gpu_cmd_suspended(uint32_t cmd) "cmd 0x%x"
# qxl.c
-disable qxl_io_write_vga(int qid, const char *mode, uint32_t addr, uint32_t val) "%d %s addr=%u val=%u"
+qxl_io_write_vga(int qid, const char *mode, uint32_t addr, uint32_t val) "%d %s addr=%u val=%u"
qxl_create_guest_primary(int qid, uint32_t width, uint32_t height, uint64_t mem, uint32_t format, uint32_t position) "%d %ux%u mem=0x%" PRIx64 " %u,%u"
qxl_create_guest_primary_rest(int qid, int32_t stride, uint32_t type, uint32_t flags) "%d %d,%d,%d"
qxl_destroy_primary(int qid) "%d"
diff --git a/target/hppa/trace-events b/target/hppa/trace-events
index 01761a4559b..7c897610a9e 100644
--- a/target/hppa/trace-events
+++ b/target/hppa/trace-events
@@ -1,19 +1,19 @@
# See docs/devel/tracing.rst for syntax documentation.
# mem_helper.c
-disable hppa_tlb_flush_ent(void *env, void *ent, uint64_t va_b, uint64_t va_e, uint64_t pa) "env=%p ent=%p va_b=0x%lx va_e=0x%lx pa=0x%" PRIx64
-disable hppa_tlb_find_entry(void *env, void *ent, int valid, uint64_t va_b, uint64_t va_e, uint64_t pa) "env=%p ent=%p valid=%d va_b=0x%lx va_e=0x%lx pa=0x%" PRIx64
-disable hppa_tlb_find_entry_not_found(void *env, uint64_t addr) "env=%p addr=%08lx"
-disable hppa_tlb_get_physical_address(void *env, int ret, int prot, uint64_t addr, uint64_t phys) "env=%p ret=%d prot=%d addr=0x%lx phys=0x%lx"
-disable hppa_tlb_fill_excp(void *env, uint64_t addr, int size, int type, int mmu_idx) "env=%p addr=0x%lx size=%d type=%d mmu_idx=%d"
-disable hppa_tlb_fill_success(void *env, uint64_t addr, uint64_t phys, int size, int type, int mmu_idx) "env=%p addr=0x%lx phys=0x%lx size=%d type=%d mmu_idx=%d"
-disable hppa_tlb_itlba(void *env, void *ent, uint64_t va_b, uint64_t va_e, uint64_t pa) "env=%p ent=%p va_b=0x%lx va_e=0x%lx pa=0x%" PRIx64
-disable hppa_tlb_itlbp(void *env, void *ent, int access_id, int u, int pl2, int pl1, int type, int b, int d, int t) "env=%p ent=%p access_id=%x u=%d pl2=%d pl1=%d type=%d b=%d d=%d t=%d"
-disable hppa_tlb_ptlb(void *env) "env=%p"
-disable hppa_tlb_ptlb_local(void *env) "env=%p"
-disable hppa_tlb_ptlbe(void *env) "env=%p"
-disable hppa_tlb_lpa_success(void *env, uint64_t addr, uint64_t phys) "env=%p addr=0x%lx phys=0x%lx"
-disable hppa_tlb_lpa_failed(void *env, uint64_t addr) "env=%p addr=0x%lx"
+hppa_tlb_flush_ent(void *env, void *ent, uint64_t va_b, uint64_t va_e, uint64_t pa) "env=%p ent=%p va_b=0x%lx va_e=0x%lx pa=0x%" PRIx64
+hppa_tlb_find_entry(void *env, void *ent, int valid, uint64_t va_b, uint64_t va_e, uint64_t pa) "env=%p ent=%p valid=%d va_b=0x%lx va_e=0x%lx pa=0x%" PRIx64
+hppa_tlb_find_entry_not_found(void *env, uint64_t addr) "env=%p addr=%08lx"
+hppa_tlb_get_physical_address(void *env, int ret, int prot, uint64_t addr, uint64_t phys) "env=%p ret=%d prot=%d addr=0x%lx phys=0x%lx"
+hppa_tlb_fill_excp(void *env, uint64_t addr, int size, int type, int mmu_idx) "env=%p addr=0x%lx size=%d type=%d mmu_idx=%d"
+hppa_tlb_fill_success(void *env, uint64_t addr, uint64_t phys, int size, int type, int mmu_idx) "env=%p addr=0x%lx phys=0x%lx size=%d type=%d mmu_idx=%d"
+hppa_tlb_itlba(void *env, void *ent, uint64_t va_b, uint64_t va_e, uint64_t pa) "env=%p ent=%p va_b=0x%lx va_e=0x%lx pa=0x%" PRIx64
+hppa_tlb_itlbp(void *env, void *ent, int access_id, int u, int pl2, int pl1, int type, int b, int d, int t) "env=%p ent=%p access_id=%x u=%d pl2=%d pl1=%d type=%d b=%d d=%d t=%d"
+hppa_tlb_ptlb(void *env) "env=%p"
+hppa_tlb_ptlb_local(void *env) "env=%p"
+hppa_tlb_ptlbe(void *env) "env=%p"
+hppa_tlb_lpa_success(void *env, uint64_t addr, uint64_t phys) "env=%p addr=0x%lx phys=0x%lx"
+hppa_tlb_lpa_failed(void *env, uint64_t addr) "env=%p addr=0x%lx"
# op_helper.c
-disable hppa_tlb_probe(uint64_t addr, int level, int want) "addr=0x%lx level=%d want=%d"
+hppa_tlb_probe(uint64_t addr, int level, int want) "addr=0x%lx level=%d want=%d"
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 18/20] trace: stop tracking static disabled state
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (16 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 17/20] trace: remove "disable" property from trace files Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 19:14 ` marcandre.lureau
2026-10-01 15:12 ` [PATCH 19/20] trace: remove parsing of "disable" event property Daniel P. Berrangé
` (2 subsequent siblings)
20 siblings, 1 reply; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The TraceEvent struct contains a "bool sstate" field which track whether
a trace event was disabled statically. i.e. at build time via the
"disable" property annotation in trace-events.
The only runtime use of this field is to let "trace-event-get-state"
report that an event is "unavailable" instead of reporting an error for
an unknown trace event.
Trace events are not ABI so their names can change and the event can
come and go at any time. Thus there is little utility in reporting the
existence of a disabled event that cannot ever be used at runtime.
Removing the "bool sstate" field from TraceEvent saves 8 bytes of
space in the struct, adding up to approx 64 KB across all current
events.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
qapi/trace.json | 5 ++--
scripts/tracetool/format/c.py | 2 --
scripts/tracetool/format/h.py | 8 ------
stubs/trace-control.c | 1 -
tests/tracetool/all.c | 2 --
tests/tracetool/all.h | 14 +++++------
tests/tracetool/dtrace.c | 2 --
tests/tracetool/dtrace.h | 2 --
tests/tracetool/ftrace.c | 2 --
tests/tracetool/ftrace.h | 6 ++---
tests/tracetool/log.c | 2 --
tests/tracetool/log.h | 6 ++---
tests/tracetool/nop.h | 2 --
tests/tracetool/simple.c | 2 --
tests/tracetool/simple.h | 2 --
tests/tracetool/syslog.c | 2 --
tests/tracetool/syslog.h | 6 ++---
tests/tracetool/ust.c | 2 --
tests/tracetool/ust.h | 2 --
trace/control-internal.h | 6 -----
trace/control-target.c | 2 --
trace/control.c | 9 -------
trace/control.h | 18 +++-----------
trace/event-internal.h | 2 --
trace/qmp.c | 47 ++++++++++-------------------------
25 files changed, 30 insertions(+), 124 deletions(-)
diff --git a/qapi/trace.json b/qapi/trace.json
index de369dae6b5..a5aaf2cab0e 100644
--- a/qapi/trace.json
+++ b/qapi/trace.json
@@ -17,8 +17,6 @@
#
# State of a tracing event.
#
-# @unavailable: The event is statically disabled.
-#
# @disabled: The event is dynamically disabled.
#
# @enabled: The event is dynamically enabled.
@@ -26,7 +24,7 @@
# Since: 2.2
##
{ 'enum': 'TraceEventState',
- 'data': ['unavailable', 'disabled', 'enabled'] }
+ 'data': ['disabled', 'enabled'] }
##
# @TraceEventInfo:
@@ -73,6 +71,7 @@
# @enable: Whether to enable tracing.
#
# @ignore-unavailable: Do not match unavailable events with @name.
+# Deprecated: since 11.2
#
# Since: 2.2
#
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index 5f6669c917c..9f06894623e 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -39,12 +39,10 @@ def generate(events, backend, group):
' .id = 0,',
'#endif',
' .name = \"%(name)s\",',
- ' .sstate = %(sstate)s,',
' .dstate = &%(dstate)s',
'};',
event = e.api(e.QEMU_EVENT),
name = e.name,
- sstate = "TRACE_%s_ENABLED" % e.name.upper(),
dstate = e.api(e.QEMU_DSTATE))
out('TraceEvent *%(group)s_trace_events[] = {',
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 6ffb7256e31..3ca92ba5fbe 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -38,14 +38,6 @@ def generate(events, backend, group):
for e in events:
out('#define %s 0' % e.api(e.QEMU_DSTATE))
- # static state
- for e in events:
- if 'disable' in e.properties:
- enabled = 0
- else:
- enabled = 1
- out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
-
backend.generate_begin(events, group)
for e in events:
diff --git a/stubs/trace-control.c b/stubs/trace-control.c
index 3f196835db0..6016307ed8b 100644
--- a/stubs/trace-control.c
+++ b/stubs/trace-control.c
@@ -14,7 +14,6 @@
void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
bool state_pre;
- assert(trace_event_get_state_static(ev));
/*
* We ignore the "vcpu" property here, since there's no target code. Then
diff --git a/tests/tracetool/all.c b/tests/tracetool/all.c
index 3b8d4d32d17..670f9f06e85 100644
--- a/tests/tracetool/all.c
+++ b/tests/tracetool/all.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/all.h b/tests/tracetool/all.h
index a2c2d40388e..6eed86edb4d 100644
--- a/tests/tracetool/all.h
+++ b/tests/tracetool/all.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#ifndef SDT_USE_VARIADIC
#define SDT_USE_VARIADIC 1
#endif
@@ -59,16 +57,16 @@ static inline void trace_test_blah(void *context, const char *filename)
if (trace_event_get_state(TRACE_TEST_BLAH)) {
#line 4 "trace-events"
ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
-#line 62 "all.h"
+#line 60 "all.h"
if (qemu_loglevel_mask(LOG_TRACE)) {
#line 4 "trace-events"
qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
-#line 66 "all.h"
+#line 64 "all.h"
}
_simple_trace_test_blah(context, filename);
#line 4 "trace-events"
syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
-#line 71 "all.h"
+#line 69 "all.h"
}
}
@@ -89,16 +87,16 @@ static inline void trace_test_wibble(void *context, int value)
if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
#line 5 "trace-events"
ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
-#line 91 "all.h"
+#line 89 "all.h"
if (qemu_loglevel_mask(LOG_TRACE)) {
#line 5 "trace-events"
qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
-#line 95 "all.h"
+#line 93 "all.h"
}
_simple_trace_test_wibble(context, value);
#line 5 "trace-events"
syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
-#line 100 "all.h"
+#line 98 "all.h"
}
}
#endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/dtrace.c b/tests/tracetool/dtrace.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/dtrace.c
+++ b/tests/tracetool/dtrace.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/dtrace.h b/tests/tracetool/dtrace.h
index 0b5b47089e8..b9283851eb0 100644
--- a/tests/tracetool/dtrace.h
+++ b/tests/tracetool/dtrace.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#ifndef SDT_USE_VARIADIC
#define SDT_USE_VARIADIC 1
#endif
diff --git a/tests/tracetool/ftrace.c b/tests/tracetool/ftrace.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/ftrace.c
+++ b/tests/tracetool/ftrace.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/ftrace.h b/tests/tracetool/ftrace.h
index b34eef17d10..4eba6b4d599 100644
--- a/tests/tracetool/ftrace.h
+++ b/tests/tracetool/ftrace.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#include "trace/ftrace.h"
@@ -24,7 +22,7 @@ static inline void trace_test_blah(void *context, const char *filename)
if (trace_event_get_state(TRACE_TEST_BLAH)) {
#line 4 "trace-events"
ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
-#line 28 "ftrace.h"
+#line 26 "ftrace.h"
}
}
@@ -37,7 +35,7 @@ static inline void trace_test_wibble(void *context, int value)
if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
#line 5 "trace-events"
ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
-#line 41 "ftrace.h"
+#line 39 "ftrace.h"
}
}
#endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/log.c b/tests/tracetool/log.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/log.c
+++ b/tests/tracetool/log.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
index fe08277887f..cf37ed3ce26 100644
--- a/tests/tracetool/log.h
+++ b/tests/tracetool/log.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#include "qemu/log-for-trace.h"
@@ -26,7 +24,7 @@ static inline void trace_test_blah(void *context, const char *filename)
if (qemu_loglevel_mask(LOG_TRACE)) {
#line 4 "trace-events"
qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
-#line 29 "log.h"
+#line 27 "log.h"
}
}
}
@@ -42,7 +40,7 @@ static inline void trace_test_wibble(void *context, int value)
if (qemu_loglevel_mask(LOG_TRACE)) {
#line 5 "trace-events"
qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
-#line 44 "log.h"
+#line 42 "log.h"
}
}
}
diff --git a/tests/tracetool/nop.h b/tests/tracetool/nop.h
index 64b6b005684..00771577943 100644
--- a/tests/tracetool/nop.h
+++ b/tests/tracetool/nop.h
@@ -8,8 +8,6 @@
#define _TRACE_TEST_BLAH_DSTATE 0
#define _TRACE_TEST_WIBBLE_DSTATE 0
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
false)
diff --git a/tests/tracetool/simple.c b/tests/tracetool/simple.c
index 3b8d4d32d17..670f9f06e85 100644
--- a/tests/tracetool/simple.c
+++ b/tests/tracetool/simple.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/simple.h b/tests/tracetool/simple.h
index 735cb21d911..9b066364b0a 100644
--- a/tests/tracetool/simple.h
+++ b/tests/tracetool/simple.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
void _simple_trace_test_blah(void *context, const char *filename);
void _simple_trace_test_wibble(void *context, int value);
diff --git a/tests/tracetool/syslog.c b/tests/tracetool/syslog.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/syslog.c
+++ b/tests/tracetool/syslog.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/syslog.h b/tests/tracetool/syslog.h
index 4203b8b37dc..6a9304489f6 100644
--- a/tests/tracetool/syslog.h
+++ b/tests/tracetool/syslog.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#include <syslog.h>
@@ -24,7 +22,7 @@ static inline void trace_test_blah(void *context, const char *filename)
if (trace_event_get_state(TRACE_TEST_BLAH)) {
#line 4 "trace-events"
syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
-#line 28 "syslog.h"
+#line 26 "syslog.h"
}
}
@@ -37,7 +35,7 @@ static inline void trace_test_wibble(void *context, int value)
if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
#line 5 "trace-events"
syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
-#line 41 "syslog.h"
+#line 39 "syslog.h"
}
}
#endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/ust.c b/tests/tracetool/ust.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/ust.c
+++ b/tests/tracetool/ust.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
.id = 0,
#endif
.name = "test_blah",
- .sstate = TRACE_TEST_BLAH_ENABLED,
.dstate = &_TRACE_TEST_BLAH_DSTATE
};
TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
.id = 0,
#endif
.name = "test_wibble",
- .sstate = TRACE_TEST_WIBBLE_ENABLED,
.dstate = &_TRACE_TEST_WIBBLE_DSTATE
};
TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/ust.h b/tests/tracetool/ust.h
index 079b2c74491..c6c5d6d7c1c 100644
--- a/tests/tracetool/ust.h
+++ b/tests/tracetool/ust.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
extern uint8_t _TRACE_TEST_BLAH_DSTATE;
extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
#include <lttng/tracepoint.h>
#include "trace-ust-testsuite.h"
diff --git a/trace/control-internal.h b/trace/control-internal.h
index f626b047264..9a95e6714bb 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -33,12 +33,6 @@ static inline const char * trace_event_get_name(TraceEvent *ev)
return ev->name;
}
-static inline bool trace_event_get_state_static(TraceEvent *ev)
-{
- assert(ev != NULL);
- return ev->sstate;
-}
-
/* it's on fast path, avoid consistency checks (asserts) */
#define trace_event_get_state_dynamic_by_id(id) \
(unlikely(trace_events_enabled_count) && _ ## id ## _DSTATE)
diff --git a/trace/control-target.c b/trace/control-target.c
index 87b0f5037df..348125a5822 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -12,8 +12,6 @@
void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
- assert(trace_event_get_state_static(ev));
-
bool state_pre = *ev->dstate;
if (state_pre != state) {
if (state) {
diff --git a/trace/control.c b/trace/control.c
index 947b220056a..d414b1a9072 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -167,15 +167,6 @@ static void do_trace_enable_events(const char *line_buf)
trace_event_iter_init_pattern(&iter, line_ptr);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
- if (!trace_event_get_state_static(ev)) {
- if (!is_pattern) {
- warn_report("trace event '%s' is not traceable",
- line_ptr);
- return;
- }
- continue;
- }
-
/* start tracing */
trace_event_set_state_dynamic(ev, enable);
if (!is_pattern) {
diff --git a/trace/control.h b/trace/control.h
index e77c07a8e68..80eb2bd14e6 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -107,13 +107,13 @@ static const char * trace_event_get_name(TraceEvent *ev);
* impact.
*/
#define trace_event_get_state(id) \
- ((id ##_ENABLED) && trace_event_get_state_dynamic_by_id(id))
+ (trace_event_get_state_dynamic_by_id(id))
/**
* trace_event_get_state_backends:
* @id: Event identifier name.
*
- * Get the tracing state of an event, both static and dynamic state from all
+ * Get the tracing state of an event from all
* compiled-in backends.
*
* If the event has the disabled property, the check will have no performance
@@ -123,18 +123,7 @@ static const char * trace_event_get_name(TraceEvent *ev);
* does not have the disabled property.
*/
#define trace_event_get_state_backends(id) \
- ((id ##_ENABLED) && id ##_BACKEND_DSTATE())
-
-/**
- * trace_event_get_state_static:
- * @id: Event identifier.
- *
- * Get the static tracing state of an event.
- *
- * Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
- * be set to 1 or 0 according to the presence of the disabled property).
- */
-static bool trace_event_get_state_static(TraceEvent *ev);
+ (id ##_BACKEND_DSTATE())
/**
* trace_event_get_state_dynamic:
@@ -148,7 +137,6 @@ static bool trace_event_get_state_dynamic(TraceEvent *ev);
*
* Set the dynamic tracing state of an event.
*
- * Pre-condition: trace_event_get_state_static(ev) == true
*/
void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
diff --git a/trace/event-internal.h b/trace/event-internal.h
index ad1578aa2c5..40f06691063 100644
--- a/trace/event-internal.h
+++ b/trace/event-internal.h
@@ -14,7 +14,6 @@
* TraceEvent:
* @id: Unique event identifier.
* @name: Event name.
- * @sstate: Static tracing state.
* @dstate: Dynamic tracing state
*
* Opaque generic description of a tracing event.
@@ -24,7 +23,6 @@ typedef struct TraceEvent {
uint32_t id;
#endif
const char * name;
- const bool sstate;
uint8_t *dstate;
} TraceEvent;
diff --git a/trace/qmp.c b/trace/qmp.c
index 074a27b204f..331496a1471 100644
--- a/trace/qmp.c
+++ b/trace/qmp.c
@@ -11,9 +11,10 @@
#include "qapi/error.h"
#include "qapi/qapi-commands-trace.h"
#include "control.h"
+#include "qemu/error-report.h"
-static bool check_events(bool ignore_unavailable, bool is_pattern,
+static bool check_events(bool is_pattern,
const char *name, Error **errp)
{
if (!is_pattern) {
@@ -24,27 +25,8 @@ static bool check_events(bool ignore_unavailable, bool is_pattern,
error_setg(errp, "unknown event \"%s\"", name);
return false;
}
-
- /* error for unavailable event */
- if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
- error_setg(errp, "event \"%s\" is disabled", name);
- return false;
- }
-
- return true;
- } else {
- /* error for unavailable events */
- TraceEventIter iter;
- TraceEvent *ev;
- trace_event_iter_init_pattern(&iter, name);
- while ((ev = trace_event_iter_next(&iter)) != NULL) {
- if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
- error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
- return false;
- }
- }
- return true;
}
+ return true;
}
TraceEventInfoList *qmp_trace_event_get_state(const char *name,
@@ -56,7 +38,7 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
bool is_pattern = trace_event_is_pattern(name);
/* Check events */
- if (!check_events(true, is_pattern, name, errp)) {
+ if (!check_events(is_pattern, name, errp)) {
return NULL;
}
@@ -68,14 +50,10 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
value = g_new(TraceEventInfo, 1);
value->name = g_strdup(trace_event_get_name(ev));
- if (!trace_event_get_state_static(ev)) {
- value->state = TRACE_EVENT_STATE_UNAVAILABLE;
+ if (trace_event_get_state_dynamic(ev)) {
+ value->state = TRACE_EVENT_STATE_ENABLED;
} else {
- if (trace_event_get_state_dynamic(ev)) {
- value->state = TRACE_EVENT_STATE_ENABLED;
- } else {
- value->state = TRACE_EVENT_STATE_DISABLED;
- }
+ value->state = TRACE_EVENT_STATE_DISABLED;
}
QAPI_LIST_PREPEND(events, value);
}
@@ -91,18 +69,19 @@ void qmp_trace_event_set_state(const char *name, bool enable,
TraceEvent *ev;
bool is_pattern = trace_event_is_pattern(name);
+ if (has_ignore_unavailable && ignore_unavailable) {
+ warn_report_once("the 'ignore-unavailable' property is deprecated "
+ "and has no effect");
+ }
+
/* Check events */
- if (!check_events(has_ignore_unavailable && ignore_unavailable,
- is_pattern, name, errp)) {
+ if (!check_events(is_pattern, name, errp)) {
return;
}
/* Apply changes (all errors checked above) */
trace_event_iter_init_pattern(&iter, name);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
- if (!trace_event_get_state_static(ev)) {
- continue;
- }
trace_event_set_state_dynamic(ev, enable);
}
}
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* Re: [PATCH 18/20] trace: stop tracking static disabled state
2026-10-01 15:12 ` [PATCH 18/20] trace: stop tracking static disabled state Daniel P. Berrangé
@ 2026-10-01 19:14 ` marcandre.lureau
2026-10-02 9:22 ` Daniel P. Berrangé
0 siblings, 1 reply; 34+ messages in thread
From: marcandre.lureau @ 2026-10-01 19:14 UTC (permalink / raw)
To: Daniel P. Berrangé; +Cc: qemu-devel, Stefan Hajnoczi
> The TraceEvent struct contains a "bool sstate" field which track whether
> a trace event was disabled statically. i.e. at build time via the
> "disable" property annotation in trace-events.
>
> The only runtime use of this field is to let "trace-event-get-state"
> report that an event is "unavailable" instead of reporting an error for
> an unknown trace event.
>
> Trace events are not ABI so their names can change and the event can
> come and go at any time. Thus there is little utility in reporting the
> existence of a disabled event that cannot ever be used at runtime.
>
> Removing the "bool sstate" field from TraceEvent saves 8 bytes of
> space in the struct, adding up to approx 64 KB across all current
> events.
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> Message-ID: <20261001151228.3373747-19-berrange@redhat.com>
Need a tracing.rst documentation update too.
>
> diff --git a/qapi/trace.json b/qapi/trace.json
> index de369dae6b53..a5aaf2cab0ea 100644
> --- a/qapi/trace.json
> +++ b/qapi/trace.json
> @@ -17,8 +17,6 @@
> #
> # State of a tracing event.
> #
> -# @unavailable: The event is statically disabled.
> -#
> # @disabled: The event is dynamically disabled.
> #
> # @enabled: The event is dynamically enabled.
> @@ -26,7 +24,7 @@
> # Since: 2.2
> ##
> { 'enum': 'TraceEventState',
> - 'data': ['unavailable', 'disabled', 'enabled'] }
> + 'data': ['disabled', 'enabled'] }
>
> ##
> # @TraceEventInfo:
> @@ -73,6 +71,7 @@
> # @enable: Whether to enable tracing.
> #
> # @ignore-unavailable: Do not match unavailable events with @name.
> +# Deprecated: since 11.2
> #
> # Since: 2.2
> #
> diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
> index 5f6669c917c7..9f06894623e2 100644
> --- a/scripts/tracetool/format/c.py
> +++ b/scripts/tracetool/format/c.py
> @@ -39,12 +39,10 @@ def generate(events, backend, group):
> ' .id = 0,',
> '#endif',
> ' .name = \"%(name)s\",',
> - ' .sstate = %(sstate)s,',
> ' .dstate = &%(dstate)s',
> '};',
> event = e.api(e.QEMU_EVENT),
> name = e.name,
> - sstate = "TRACE_%s_ENABLED" % e.name.upper(),
> dstate = e.api(e.QEMU_DSTATE))
>
> out('TraceEvent *%(group)s_trace_events[] = {',
> diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
> index 6ffb7256e314..3ca92ba5fbe8 100644
> --- a/scripts/tracetool/format/h.py
> +++ b/scripts/tracetool/format/h.py
> @@ -38,14 +38,6 @@ def generate(events, backend, group):
> for e in events:
> out('#define %s 0' % e.api(e.QEMU_DSTATE))
>
> - # static state
> - for e in events:
> - if 'disable' in e.properties:
> - enabled = 0
> - else:
> - enabled = 1
> - out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
> -
> backend.generate_begin(events, group)
>
> for e in events:
> diff --git a/stubs/trace-control.c b/stubs/trace-control.c
> index 3f196835db00..6016307ed8b0 100644
> --- a/stubs/trace-control.c
> +++ b/stubs/trace-control.c
> @@ -14,7 +14,6 @@
> void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
> {
> bool state_pre;
> - assert(trace_event_get_state_static(ev));
>
> /*
> * We ignore the "vcpu" property here, since there's no target code. Then
> diff --git a/tests/tracetool/all.c b/tests/tracetool/all.c
> index 3b8d4d32d172..670f9f06e855 100644
> --- a/tests/tracetool/all.c
> +++ b/tests/tracetool/all.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/all.h b/tests/tracetool/all.h
> index a2c2d40388e7..6eed86edb4d8 100644
> --- a/tests/tracetool/all.h
> +++ b/tests/tracetool/all.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> #ifndef SDT_USE_VARIADIC
> #define SDT_USE_VARIADIC 1
> #endif
> @@ -59,16 +57,16 @@ static inline void trace_test_blah(void *context, const char *filename)
> if (trace_event_get_state(TRACE_TEST_BLAH)) {
> #line 4 "trace-events"
> ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
> -#line 62 "all.h"
> +#line 60 "all.h"
> if (qemu_loglevel_mask(LOG_TRACE)) {
> #line 4 "trace-events"
> qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
> -#line 66 "all.h"
> +#line 64 "all.h"
> }
> _simple_trace_test_blah(context, filename);
> #line 4 "trace-events"
> syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
> -#line 71 "all.h"
> +#line 69 "all.h"
> }
> }
>
> @@ -89,16 +87,16 @@ static inline void trace_test_wibble(void *context, int value)
> if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
> #line 5 "trace-events"
> ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
> -#line 91 "all.h"
> +#line 89 "all.h"
> if (qemu_loglevel_mask(LOG_TRACE)) {
> #line 5 "trace-events"
> qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
> -#line 95 "all.h"
> +#line 93 "all.h"
> }
> _simple_trace_test_wibble(context, value);
> #line 5 "trace-events"
> syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
> -#line 100 "all.h"
> +#line 98 "all.h"
> }
> }
> #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
> diff --git a/tests/tracetool/dtrace.c b/tests/tracetool/dtrace.c
> index f83d06252eaa..d51ba85503a8 100644
> --- a/tests/tracetool/dtrace.c
> +++ b/tests/tracetool/dtrace.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/dtrace.h b/tests/tracetool/dtrace.h
> index 0b5b47089e81..b9283851eb03 100644
> --- a/tests/tracetool/dtrace.h
> +++ b/tests/tracetool/dtrace.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> #ifndef SDT_USE_VARIADIC
> #define SDT_USE_VARIADIC 1
> #endif
> diff --git a/tests/tracetool/ftrace.c b/tests/tracetool/ftrace.c
> index f83d06252eaa..d51ba85503a8 100644
> --- a/tests/tracetool/ftrace.c
> +++ b/tests/tracetool/ftrace.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/ftrace.h b/tests/tracetool/ftrace.h
> index b34eef17d10e..4eba6b4d5991 100644
> --- a/tests/tracetool/ftrace.h
> +++ b/tests/tracetool/ftrace.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> #include "trace/ftrace.h"
>
>
> @@ -24,7 +22,7 @@ static inline void trace_test_blah(void *context, const char *filename)
> if (trace_event_get_state(TRACE_TEST_BLAH)) {
> #line 4 "trace-events"
> ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
> -#line 28 "ftrace.h"
> +#line 26 "ftrace.h"
> }
> }
>
> @@ -37,7 +35,7 @@ static inline void trace_test_wibble(void *context, int value)
> if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
> #line 5 "trace-events"
> ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
> -#line 41 "ftrace.h"
> +#line 39 "ftrace.h"
> }
> }
> #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
> diff --git a/tests/tracetool/log.c b/tests/tracetool/log.c
> index f83d06252eaa..d51ba85503a8 100644
> --- a/tests/tracetool/log.c
> +++ b/tests/tracetool/log.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
> index fe08277887f7..cf37ed3ce263 100644
> --- a/tests/tracetool/log.h
> +++ b/tests/tracetool/log.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> #include "qemu/log-for-trace.h"
>
>
> @@ -26,7 +24,7 @@ static inline void trace_test_blah(void *context, const char *filename)
> if (qemu_loglevel_mask(LOG_TRACE)) {
> #line 4 "trace-events"
> qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
> -#line 29 "log.h"
> +#line 27 "log.h"
> }
> }
> }
> @@ -42,7 +40,7 @@ static inline void trace_test_wibble(void *context, int value)
> if (qemu_loglevel_mask(LOG_TRACE)) {
> #line 5 "trace-events"
> qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
> -#line 44 "log.h"
> +#line 42 "log.h"
> }
> }
> }
> diff --git a/tests/tracetool/nop.h b/tests/tracetool/nop.h
> index 64b6b0056841..007715779438 100644
> --- a/tests/tracetool/nop.h
> +++ b/tests/tracetool/nop.h
> @@ -8,8 +8,6 @@
>
> #define _TRACE_TEST_BLAH_DSTATE 0
> #define _TRACE_TEST_WIBBLE_DSTATE 0
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
>
> #define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
> false)
> diff --git a/tests/tracetool/simple.c b/tests/tracetool/simple.c
> index 3b8d4d32d172..670f9f06e855 100644
> --- a/tests/tracetool/simple.c
> +++ b/tests/tracetool/simple.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/simple.h b/tests/tracetool/simple.h
> index 735cb21d9113..9b066364b0ae 100644
> --- a/tests/tracetool/simple.h
> +++ b/tests/tracetool/simple.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> void _simple_trace_test_blah(void *context, const char *filename);
> void _simple_trace_test_wibble(void *context, int value);
>
> diff --git a/tests/tracetool/syslog.c b/tests/tracetool/syslog.c
> index f83d06252eaa..d51ba85503a8 100644
> --- a/tests/tracetool/syslog.c
> +++ b/tests/tracetool/syslog.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/syslog.h b/tests/tracetool/syslog.h
> index 4203b8b37dcc..6a9304489f6c 100644
> --- a/tests/tracetool/syslog.h
> +++ b/tests/tracetool/syslog.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> #include <syslog.h>
>
>
> @@ -24,7 +22,7 @@ static inline void trace_test_blah(void *context, const char *filename)
> if (trace_event_get_state(TRACE_TEST_BLAH)) {
> #line 4 "trace-events"
> syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
> -#line 28 "syslog.h"
> +#line 26 "syslog.h"
> }
> }
>
> @@ -37,7 +35,7 @@ static inline void trace_test_wibble(void *context, int value)
> if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
> #line 5 "trace-events"
> syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
> -#line 41 "syslog.h"
> +#line 39 "syslog.h"
> }
> }
> #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
> diff --git a/tests/tracetool/ust.c b/tests/tracetool/ust.c
> index f83d06252eaa..d51ba85503a8 100644
> --- a/tests/tracetool/ust.c
> +++ b/tests/tracetool/ust.c
> @@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
> .id = 0,
> #endif
> .name = "test_blah",
> - .sstate = TRACE_TEST_BLAH_ENABLED,
> .dstate = &_TRACE_TEST_BLAH_DSTATE
> };
> TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> @@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
> .id = 0,
> #endif
> .name = "test_wibble",
> - .sstate = TRACE_TEST_WIBBLE_ENABLED,
> .dstate = &_TRACE_TEST_WIBBLE_DSTATE
> };
> TraceEvent *testsuite_trace_events[] = {
> diff --git a/tests/tracetool/ust.h b/tests/tracetool/ust.h
> index 079b2c744917..c6c5d6d7c1cf 100644
> --- a/tests/tracetool/ust.h
> +++ b/tests/tracetool/ust.h
> @@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
> extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
> extern uint8_t _TRACE_TEST_BLAH_DSTATE;
> extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
> -#define TRACE_TEST_BLAH_ENABLED 1
> -#define TRACE_TEST_WIBBLE_ENABLED 1
> #include <lttng/tracepoint.h>
> #include "trace-ust-testsuite.h"
>
> diff --git a/trace/control-internal.h b/trace/control-internal.h
> index f626b0472644..9a95e6714bb4 100644
> --- a/trace/control-internal.h
> +++ b/trace/control-internal.h
> @@ -33,12 +33,6 @@ static inline const char * trace_event_get_name(TraceEvent *ev)
> return ev->name;
> }
>
> -static inline bool trace_event_get_state_static(TraceEvent *ev)
> -{
> - assert(ev != NULL);
> - return ev->sstate;
> -}
> -
> /* it's on fast path, avoid consistency checks (asserts) */
> #define trace_event_get_state_dynamic_by_id(id) \
> (unlikely(trace_events_enabled_count) && _ ## id ## _DSTATE)
> diff --git a/trace/control-target.c b/trace/control-target.c
> index 87b0f5037df1..348125a5822b 100644
> --- a/trace/control-target.c
> +++ b/trace/control-target.c
> @@ -12,8 +12,6 @@
>
> void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
> {
> - assert(trace_event_get_state_static(ev));
> -
> bool state_pre = *ev->dstate;
> if (state_pre != state) {
> if (state) {
> diff --git a/trace/control.c b/trace/control.c
> index 947b220056ac..d414b1a90725 100644
> --- a/trace/control.c
> +++ b/trace/control.c
> @@ -167,15 +167,6 @@ static void do_trace_enable_events(const char *line_buf)
>
> trace_event_iter_init_pattern(&iter, line_ptr);
> while ((ev = trace_event_iter_next(&iter)) != NULL) {
> - if (!trace_event_get_state_static(ev)) {
> - if (!is_pattern) {
> - warn_report("trace event '%s' is not traceable",
> - line_ptr);
> - return;
> - }
> - continue;
> - }
> -
> /* start tracing */
> trace_event_set_state_dynamic(ev, enable);
> if (!is_pattern) {
> diff --git a/trace/control.h b/trace/control.h
> index e77c07a8e68e..80eb2bd14e6f 100644
> --- a/trace/control.h
> +++ b/trace/control.h
> @@ -107,13 +107,13 @@ static const char * trace_event_get_name(TraceEvent *ev);
> * impact.
> */
> #define trace_event_get_state(id) \
> - ((id ##_ENABLED) && trace_event_get_state_dynamic_by_id(id))
> + (trace_event_get_state_dynamic_by_id(id))
>
> /**
> * trace_event_get_state_backends:
> * @id: Event identifier name.
> *
> - * Get the tracing state of an event, both static and dynamic state from all
> + * Get the tracing state of an event from all
> * compiled-in backends.
> *
> * If the event has the disabled property, the check will have no performance
> @@ -123,18 +123,7 @@ static const char * trace_event_get_name(TraceEvent *ev);
> * does not have the disabled property.
> */
It should also drop the mention of "disabled property"
> #define trace_event_get_state_backends(id) \
> - ((id ##_ENABLED) && id ##_BACKEND_DSTATE())
> -
> -/**
> - * trace_event_get_state_static:
> - * @id: Event identifier.
> - *
> - * Get the static tracing state of an event.
> - *
> - * Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
> - * be set to 1 or 0 according to the presence of the disabled property).
> - */
> -static bool trace_event_get_state_static(TraceEvent *ev);
> + (id ##_BACKEND_DSTATE())
>
> /**
> * trace_event_get_state_dynamic:
> @@ -148,7 +137,6 @@ static bool trace_event_get_state_dynamic(TraceEvent *ev);
> *
> * Set the dynamic tracing state of an event.
> *
> - * Pre-condition: trace_event_get_state_static(ev) == true
> */
> void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
>
> diff --git a/trace/event-internal.h b/trace/event-internal.h
> index ad1578aa2c53..40f06691063a 100644
> --- a/trace/event-internal.h
> +++ b/trace/event-internal.h
> @@ -14,7 +14,6 @@
> * TraceEvent:
> * @id: Unique event identifier.
> * @name: Event name.
> - * @sstate: Static tracing state.
> * @dstate: Dynamic tracing state
> *
> * Opaque generic description of a tracing event.
> @@ -24,7 +23,6 @@ typedef struct TraceEvent {
> uint32_t id;
> #endif
> const char * name;
> - const bool sstate;
> uint8_t *dstate;
> } TraceEvent;
>
> diff --git a/trace/qmp.c b/trace/qmp.c
> index 074a27b204fd..331496a1471d 100644
> --- a/trace/qmp.c
> +++ b/trace/qmp.c
> @@ -11,9 +11,10 @@
> #include "qapi/error.h"
> #include "qapi/qapi-commands-trace.h"
> #include "control.h"
> +#include "qemu/error-report.h"
>
>
> -static bool check_events(bool ignore_unavailable, bool is_pattern,
> +static bool check_events(bool is_pattern,
> const char *name, Error **errp)
> {
> if (!is_pattern) {
> @@ -24,27 +25,8 @@ static bool check_events(bool ignore_unavailable, bool is_pattern,
> error_setg(errp, "unknown event \"%s\"", name);
> return false;
> }
> -
> - /* error for unavailable event */
> - if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
> - error_setg(errp, "event \"%s\" is disabled", name);
> - return false;
> - }
> -
> - return true;
> - } else {
> - /* error for unavailable events */
> - TraceEventIter iter;
> - TraceEvent *ev;
> - trace_event_iter_init_pattern(&iter, name);
> - while ((ev = trace_event_iter_next(&iter)) != NULL) {
> - if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
> - error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
> - return false;
> - }
> - }
> - return true;
> }
> + return true;
> }
>
> TraceEventInfoList *qmp_trace_event_get_state(const char *name,
> @@ -56,7 +38,7 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
> bool is_pattern = trace_event_is_pattern(name);
>
> /* Check events */
> - if (!check_events(true, is_pattern, name, errp)) {
> + if (!check_events(is_pattern, name, errp)) {
> return NULL;
> }
>
> @@ -68,14 +50,10 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
> value = g_new(TraceEventInfo, 1);
> value->name = g_strdup(trace_event_get_name(ev));
>
> - if (!trace_event_get_state_static(ev)) {
> - value->state = TRACE_EVENT_STATE_UNAVAILABLE;
> + if (trace_event_get_state_dynamic(ev)) {
> + value->state = TRACE_EVENT_STATE_ENABLED;
> } else {
> - if (trace_event_get_state_dynamic(ev)) {
> - value->state = TRACE_EVENT_STATE_ENABLED;
> - } else {
> - value->state = TRACE_EVENT_STATE_DISABLED;
> - }
> + value->state = TRACE_EVENT_STATE_DISABLED;
> }
> QAPI_LIST_PREPEND(events, value);
> }
> @@ -91,18 +69,19 @@ void qmp_trace_event_set_state(const char *name, bool enable,
> TraceEvent *ev;
> bool is_pattern = trace_event_is_pattern(name);
>
> + if (has_ignore_unavailable && ignore_unavailable) {
> + warn_report_once("the 'ignore-unavailable' property is deprecated "
> + "and has no effect");
> + }
> +
> /* Check events */
> - if (!check_events(has_ignore_unavailable && ignore_unavailable,
> - is_pattern, name, errp)) {
> + if (!check_events(is_pattern, name, errp)) {
> return;
> }
>
> /* Apply changes (all errors checked above) */
> trace_event_iter_init_pattern(&iter, name);
> while ((ev = trace_event_iter_next(&iter)) != NULL) {
> - if (!trace_event_get_state_static(ev)) {
> - continue;
> - }
> trace_event_set_state_dynamic(ev, enable);
> }
> }
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
--
Marc-André Lureau <marcandre.lureau@redhat.com>
^ permalink raw reply [flat|nested] 34+ messages in thread* Re: [PATCH 18/20] trace: stop tracking static disabled state
2026-10-01 19:14 ` marcandre.lureau
@ 2026-10-02 9:22 ` Daniel P. Berrangé
0 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-02 9:22 UTC (permalink / raw)
To: marcandre.lureau; +Cc: qemu-devel, Stefan Hajnoczi
On Thu, Oct 01, 2026 at 11:14:36PM +0400, marcandre.lureau@redhat.com wrote:
> > The TraceEvent struct contains a "bool sstate" field which track whether
> > a trace event was disabled statically. i.e. at build time via the
> > "disable" property annotation in trace-events.
> >
> > The only runtime use of this field is to let "trace-event-get-state"
> > report that an event is "unavailable" instead of reporting an error for
> > an unknown trace event.
> >
> > Trace events are not ABI so their names can change and the event can
> > come and go at any time. Thus there is little utility in reporting the
> > existence of a disabled event that cannot ever be used at runtime.
> >
> > Removing the "bool sstate" field from TraceEvent saves 8 bytes of
> > space in the struct, adding up to approx 64 KB across all current
> > events.
> >
> > Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> > Message-ID: <20261001151228.3373747-19-berrange@redhat.com>
>
> Need a tracing.rst documentation update too.
I'll do that docs in the next patch, since that is the
one that actually removes the functional part of the
feature.
With regards,
Daniel
--
|: https://berrange.com ~~ https://hachyderm.io/@berrange :|
|: https://libvirt.org ~~ https://entangle-photo.org :|
|: https://pixelfed.art/berrange ~~ https://fstop138.berrange.com :|
^ permalink raw reply [flat|nested] 34+ messages in thread
* [PATCH 19/20] trace: remove parsing of "disable" event property
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (17 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 18/20] trace: stop tracking static disabled state Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 15:12 ` [PATCH 20/20] trace: remove 'trace_event_get_state' wrapper Daniel P. Berrangé
2026-10-01 19:14 ` [PATCH 00/20] trace: bugfixes, cleanups and optimizations marcandre.lureau
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
Finish the removal of the "disable" event property by removing code
that parses properties and the backend code generators.
This "fixes" a bug in the UST backends which looked for a property
called "disabled" instead of "disable".
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
scripts/tracetool/__init__.py | 27 +++++---------------
scripts/tracetool/backend/dtrace.py | 2 --
scripts/tracetool/format/c.py | 9 +++----
scripts/tracetool/format/d.py | 3 ---
scripts/tracetool/format/h.py | 20 +++++++--------
scripts/tracetool/format/log_stap.py | 3 ---
scripts/tracetool/format/rs.py | 26 +++++++++----------
scripts/tracetool/format/simpletrace_stap.py | 3 ---
scripts/tracetool/format/stap.py | 3 ---
scripts/tracetool/format/ust_events_c.py | 3 ---
scripts/tracetool/format/ust_events_h.py | 3 ---
11 files changed, 30 insertions(+), 72 deletions(-)
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 6ed7cdd6ce4..bdbb06b5205 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -362,8 +362,6 @@ class Event(object):
The event name.
fmt : str
The event format string.
- properties : set(str)
- Properties of the event.
args : Arguments
The event arguments.
lineno : int
@@ -373,23 +371,18 @@ class Event(object):
"""
- _CRE = re.compile(r"((?P<props>[\w\s]+)\s+)?"
- r"(?P<name>\w+)"
+ _CRE = re.compile(r"(?P<name>\w+)"
r"\((?P<args>[^)]*)\)"
r"\s*"
r"(?P<fmt>\".+)?"
r"\s*")
- _VALID_PROPS = set(["disable"])
-
- def __init__(self, name, props, fmt, args, lineno, filename):
+ def __init__(self, name, fmt, args, lineno, filename):
"""
Parameters
----------
name : string
Event name.
- props : list of str
- Property names.
fmt : str
Event printing format string.
args : Arguments
@@ -401,7 +394,6 @@ def __init__(self, name, props, fmt, args, lineno, filename):
"""
self.name = name
- self.properties = props
self.fmt = fmt
self.args = args
self.lineno = int(lineno)
@@ -411,11 +403,6 @@ def __init__(self, name, props, fmt, args, lineno, filename):
raise ValueError("Event '%s' has more than maximum permitted "
"argument count" % name)
- unknown_props = set(self.properties) - self._VALID_PROPS
- if len(unknown_props) > 0:
- raise ValueError("Unknown properties: %s"
- % ", ".join(unknown_props))
-
@staticmethod
def build(line_str, lineno, filename):
@@ -435,7 +422,6 @@ def build(line_str, lineno, filename):
groups = m.groupdict('')
name = groups["name"]
- props = groups["props"].split()
fmt = groups["fmt"]
if fmt.find("%m") != -1:
raise ValueError("Event format '%m' is forbidden, pass the error "
@@ -448,14 +434,13 @@ def build(line_str, lineno, filename):
args = Arguments.build(groups["args"])
- return Event(name, props, fmt, args, lineno, posix_relpath(filename))
+ return Event(name, fmt, args, lineno, posix_relpath(filename))
def __repr__(self):
"""Evaluable string representation for this object."""
- return "Event('%s %s(%s) %s')" % (" ".join(self.properties),
- self.name,
- self.args,
- self.fmt)
+ return "Event('%s(%s) %s')" % (self.name,
+ self.args,
+ self.fmt)
# Star matching on PRI is dangerous as one might have multiple
# arguments with that format, hence the non-greedy version of it.
_FMT = re.compile(r"(%[\d\.]*\w+|%.*?PRI\S+)")
diff --git a/scripts/tracetool/backend/dtrace.py b/scripts/tracetool/backend/dtrace.py
index f0b58cc1585..6bce25c8d2d 100644
--- a/scripts/tracetool/backend/dtrace.py
+++ b/scripts/tracetool/backend/dtrace.py
@@ -79,8 +79,6 @@ def generate_rs_begin(events, group):
# These are the Rust declarations of the .probes section semaphores
# generated by dtrace(1) in its .o file output.
for e in events:
- if 'disable' in e.properties:
- continue
out(' #[allow(dead_code)]',
f' static qemu_{e.name}_semaphore: UnsafeCell<u16>;')
out('}',
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index 9f06894623e..3754c7e06fd 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -16,9 +16,6 @@
def generate(events, backend, group):
- active_events = [e for e in events
- if "disable" not in e.properties]
-
header = "trace-" + group + ".h"
out('/* This file is autogenerated by tracetool, do not edit. */',
@@ -62,7 +59,7 @@ def generate(events, backend, group):
'trace_init(trace_%(group)s_register_events)',
group = group.lower())
- backend.generate_begin(active_events, group)
- for event in active_events:
+ backend.generate_begin(events, group)
+ for event in events:
backend.generate(event, group)
- backend.generate_end(active_events, group)
+ backend.generate_end(events, group)
diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py
index e9e33dfe30a..df7780cb0af 100644
--- a/scripts/tracetool/format/d.py
+++ b/scripts/tracetool/format/d.py
@@ -30,9 +30,6 @@
def generate(events, backend, group):
- events = [e for e in events
- if "disable" not in e.properties]
-
# SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy
# with an empty file. Avoid the warning.
# But dtrace on macOS can't deal with empty files.
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 3ca92ba5fbe..af1482f6238 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -46,8 +46,7 @@ def generate(events, backend, group):
'#define %(api)s() ( \\',
api=e.api(e.QEMU_BACKEND_DSTATE))
- if "disable" not in e.properties:
- backend.generate_backend_dstate(e, group)
+ backend.generate_backend_dstate(e, group)
out(' false)')
@@ -57,16 +56,15 @@ def generate(events, backend, group):
api=e.api(),
args=e.args)
- if "disable" not in e.properties:
- backend.generate(e, group, check_trace_event_get_state=False)
+ backend.generate(e, group, check_trace_event_get_state=False)
- if backend.check_trace_event_get_state:
- event_id = 'TRACE_' + e.name.upper()
- cond = "trace_event_get_state(%s)" % event_id
- out(' if (%(cond)s) {',
- cond=cond)
- backend.generate(e, group, check_trace_event_get_state=True)
- out(' }')
+ if backend.check_trace_event_get_state:
+ event_id = 'TRACE_' + e.name.upper()
+ cond = "trace_event_get_state(%s)" % event_id
+ out(' if (%(cond)s) {',
+ cond=cond)
+ backend.generate(e, group, check_trace_event_get_state=True)
+ out(' }')
out('}')
backend.generate_end(events, group)
diff --git a/scripts/tracetool/format/log_stap.py b/scripts/tracetool/format/log_stap.py
index 259303a189d..3fa6c2dd3f2 100644
--- a/scripts/tracetool/format/log_stap.py
+++ b/scripts/tracetool/format/log_stap.py
@@ -90,9 +90,6 @@ def generate(events, backend, group):
'')
for event_id, e in enumerate(events):
- if 'disable' in e.properties:
- continue
-
out('probe %(probeprefix)s.log.%(name)s = %(probeprefix)s.%(name)s ?',
'{',
probeprefix=probeprefix(),
diff --git a/scripts/tracetool/format/rs.py b/scripts/tracetool/format/rs.py
index 1fddcee1ad2..97d89a981da 100644
--- a/scripts/tracetool/format/rs.py
+++ b/scripts/tracetool/format/rs.py
@@ -52,11 +52,10 @@ def generate(events, backend, group):
'{',
api=e.api(e.QEMU_RUST_DSTATE))
- if "disable" not in e.properties:
- backend.generate_backend_dstate(e, group)
- if backend.check_trace_event_get_state:
- out(' trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) ||',
- event_id = 'TRACE_' + e.name.upper())
+ backend.generate_backend_dstate(e, group)
+ if backend.check_trace_event_get_state:
+ out(' trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) ||',
+ event_id = 'TRACE_' + e.name.upper())
out(' false',
'}',
@@ -68,15 +67,14 @@ def generate(events, backend, group):
api=e.api(e.QEMU_TRACE),
args=e.args.rust_decl())
- if "disable" not in e.properties:
- backend.generate(e, group, check_trace_event_get_state=False)
- if backend.check_trace_event_get_state:
- event_id = 'TRACE_' + e.name.upper()
- out(' if trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) {',
- event_id = event_id,
- api=e.api())
- backend.generate(e, group, check_trace_event_get_state=True)
- out(' }')
+ backend.generate(e, group, check_trace_event_get_state=False)
+ if backend.check_trace_event_get_state:
+ event_id = 'TRACE_' + e.name.upper()
+ out(' if trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) {',
+ event_id = event_id,
+ api=e.api())
+ backend.generate(e, group, check_trace_event_get_state=True)
+ out(' }')
out('}',
'')
diff --git a/scripts/tracetool/format/simpletrace_stap.py b/scripts/tracetool/format/simpletrace_stap.py
index c7bde97a855..393d85319c7 100644
--- a/scripts/tracetool/format/simpletrace_stap.py
+++ b/scripts/tracetool/format/simpletrace_stap.py
@@ -24,9 +24,6 @@ def generate(events, backend, group):
'')
for event_id, e in enumerate(events):
- if 'disable' in e.properties:
- continue
-
out('probe %(probeprefix)s.simpletrace.%(name)s = %(probeprefix)s.%(name)s ?',
'{',
probeprefix=probeprefix(),
diff --git a/scripts/tracetool/format/stap.py b/scripts/tracetool/format/stap.py
index 285c9203ba7..e3d16b72d34 100644
--- a/scripts/tracetool/format/stap.py
+++ b/scripts/tracetool/format/stap.py
@@ -34,9 +34,6 @@ def stap_escape(identifier):
def generate(events, backend, group):
- events = [e for e in events
- if "disable" not in e.properties]
-
out('/* This file is autogenerated by tracetool, do not edit. */',
'/* SPDX-License-Identifier: GPL-2.0-or-later */',
'')
diff --git a/scripts/tracetool/format/ust_events_c.py b/scripts/tracetool/format/ust_events_c.py
index 074226bfd37..93f88a03e90 100644
--- a/scripts/tracetool/format/ust_events_c.py
+++ b/scripts/tracetool/format/ust_events_c.py
@@ -16,9 +16,6 @@
def generate(events, backend, group):
- events = [e for e in events
- if "disabled" not in e.properties]
-
out('/* This file is autogenerated by tracetool, do not edit. */',
'/* SPDX-License-Identifier: GPL-2.0-or-later */',
'',
diff --git a/scripts/tracetool/format/ust_events_h.py b/scripts/tracetool/format/ust_events_h.py
index 76c883bc5c0..441e6a41933 100644
--- a/scripts/tracetool/format/ust_events_h.py
+++ b/scripts/tracetool/format/ust_events_h.py
@@ -16,9 +16,6 @@
def generate(events, backend, group):
- events = [e for e in events
- if "disabled" not in e.properties]
-
if group == "all":
include = "trace-ust-all.h"
else:
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* [PATCH 20/20] trace: remove 'trace_event_get_state' wrapper
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (18 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 19/20] trace: remove parsing of "disable" event property Daniel P. Berrangé
@ 2026-10-01 15:12 ` Daniel P. Berrangé
2026-10-01 19:14 ` [PATCH 00/20] trace: bugfixes, cleanups and optimizations marcandre.lureau
20 siblings, 0 replies; 34+ messages in thread
From: Daniel P. Berrangé @ 2026-10-01 15:12 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Hajnoczi, Daniel P. Berrangé
The 'trace_event_get_state' macro is a wrapper around the
'trace_event_get_state_dynamic_by_id' macro, which is a direct
check of the _TRACE_...._DSTATE global variable.
The only code that should be using this is the generated trace
probes, but the name looks rather appealing causing it to be
mistakenly used in other places, instead of the recommended
'trace_event_get_state_dynamic_backends'.
Removing the 'trace_event_get_state' macro reduces the potential
for confusion.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
monitor/qmp.c | 4 ++--
scripts/tracetool/backend/__init__.py | 3 ++-
scripts/tracetool/format/h.py | 2 +-
tests/tracetool/all.h | 4 ++--
tests/tracetool/ftrace.h | 4 ++--
tests/tracetool/log.h | 4 ++--
tests/tracetool/simple.h | 4 ++--
tests/tracetool/syslog.h | 4 ++--
trace/control.h | 12 ------------
9 files changed, 15 insertions(+), 26 deletions(-)
diff --git a/monitor/qmp.c b/monitor/qmp.c
index aec03157750..b5cc3ee1973 100644
--- a/monitor/qmp.c
+++ b/monitor/qmp.c
@@ -439,7 +439,7 @@ void coroutine_fn monitor_qmp_dispatcher_co(void *data)
/* Process request */
if (req_obj->req) {
- if (trace_event_get_state(TRACE_MONITOR_QMP_CMD_IN_BAND)) {
+ if (trace_event_get_state_backends(TRACE_MONITOR_QMP_CMD_IN_BAND)) {
QDict *qdict = qobject_to(QDict, req_obj->req);
QObject *id = qdict ? qdict_get(qdict, "id") : NULL;
GString *id_json;
@@ -495,7 +495,7 @@ static void handle_qmp_command(void *opaque, QObject *req, Error *err)
if (qdict && qmp_is_oob(qdict)) {
/* OOB commands are executed immediately */
- if (trace_event_get_state(TRACE_MONITOR_QMP_CMD_OUT_OF_BAND)) {
+ if (trace_event_get_state_backends(TRACE_MONITOR_QMP_CMD_OUT_OF_BAND)) {
QObject *id = qdict_get(qdict, "id");
GString *id_json;
diff --git a/scripts/tracetool/backend/__init__.py b/scripts/tracetool/backend/__init__.py
index 9109a783c72..12bb91f5347 100644
--- a/scripts/tracetool/backend/__init__.py
+++ b/scripts/tracetool/backend/__init__.py
@@ -26,7 +26,8 @@
considered "public".
CHECK_TRACE_EVENT_GET_STATE If exists and is set to 'True', the backend-specific
code inside the tracepoint is emitted within an
- ``if trace_event_get_state()`` conditional.
+ ``if trace_event_get_state_dynamic_by_id()``
+ conditional.
=========================== ====================================================
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index af1482f6238..822740a3140 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -60,7 +60,7 @@ def generate(events, backend, group):
if backend.check_trace_event_get_state:
event_id = 'TRACE_' + e.name.upper()
- cond = "trace_event_get_state(%s)" % event_id
+ cond = "trace_event_get_state_dynamic_by_id(%s)" % event_id
out(' if (%(cond)s) {',
cond=cond)
backend.generate(e, group, check_trace_event_get_state=True)
diff --git a/tests/tracetool/all.h b/tests/tracetool/all.h
index 6eed86edb4d..513f59d6ffb 100644
--- a/tests/tracetool/all.h
+++ b/tests/tracetool/all.h
@@ -54,7 +54,7 @@ static inline void trace_test_blah(void *context, const char *filename)
{
QEMU_TEST_BLAH(context, filename);
tracepoint(qemu, test_blah, context, filename);
- if (trace_event_get_state(TRACE_TEST_BLAH)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH)) {
#line 4 "trace-events"
ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
#line 60 "all.h"
@@ -84,7 +84,7 @@ static inline void trace_test_wibble(void *context, int value)
{
QEMU_TEST_WIBBLE(context, value);
tracepoint(qemu, test_wibble, context, value);
- if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE)) {
#line 5 "trace-events"
ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
#line 89 "all.h"
diff --git a/tests/tracetool/ftrace.h b/tests/tracetool/ftrace.h
index 4eba6b4d599..b55ee08bbfe 100644
--- a/tests/tracetool/ftrace.h
+++ b/tests/tracetool/ftrace.h
@@ -19,7 +19,7 @@ extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
static inline void trace_test_blah(void *context, const char *filename)
{
- if (trace_event_get_state(TRACE_TEST_BLAH)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH)) {
#line 4 "trace-events"
ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
#line 26 "ftrace.h"
@@ -32,7 +32,7 @@ static inline void trace_test_blah(void *context, const char *filename)
static inline void trace_test_wibble(void *context, int value)
{
- if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE)) {
#line 5 "trace-events"
ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
#line 39 "ftrace.h"
diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
index cf37ed3ce26..973b72ff87f 100644
--- a/tests/tracetool/log.h
+++ b/tests/tracetool/log.h
@@ -20,7 +20,7 @@ extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
static inline void trace_test_blah(void *context, const char *filename)
{
- if (trace_event_get_state(TRACE_TEST_BLAH)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH)) {
if (qemu_loglevel_mask(LOG_TRACE)) {
#line 4 "trace-events"
qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
@@ -36,7 +36,7 @@ static inline void trace_test_blah(void *context, const char *filename)
static inline void trace_test_wibble(void *context, int value)
{
- if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE)) {
if (qemu_loglevel_mask(LOG_TRACE)) {
#line 5 "trace-events"
qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
diff --git a/tests/tracetool/simple.h b/tests/tracetool/simple.h
index 9b066364b0a..0b9e7cba35c 100644
--- a/tests/tracetool/simple.h
+++ b/tests/tracetool/simple.h
@@ -20,7 +20,7 @@ void _simple_trace_test_wibble(void *context, int value);
static inline void trace_test_blah(void *context, const char *filename)
{
- if (trace_event_get_state(TRACE_TEST_BLAH)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH)) {
_simple_trace_test_blah(context, filename);
}
}
@@ -31,7 +31,7 @@ static inline void trace_test_blah(void *context, const char *filename)
static inline void trace_test_wibble(void *context, int value)
{
- if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE)) {
_simple_trace_test_wibble(context, value);
}
}
diff --git a/tests/tracetool/syslog.h b/tests/tracetool/syslog.h
index 6a9304489f6..173b35dcf69 100644
--- a/tests/tracetool/syslog.h
+++ b/tests/tracetool/syslog.h
@@ -19,7 +19,7 @@ extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
static inline void trace_test_blah(void *context, const char *filename)
{
- if (trace_event_get_state(TRACE_TEST_BLAH)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_BLAH)) {
#line 4 "trace-events"
syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
#line 26 "syslog.h"
@@ -32,7 +32,7 @@ static inline void trace_test_blah(void *context, const char *filename)
static inline void trace_test_wibble(void *context, int value)
{
- if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+ if (trace_event_get_state_dynamic_by_id(TRACE_TEST_WIBBLE)) {
#line 5 "trace-events"
syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
#line 39 "syslog.h"
diff --git a/trace/control.h b/trace/control.h
index 80eb2bd14e6..0bcb34a6393 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -97,18 +97,6 @@ static uint32_t trace_event_get_id(TraceEvent *ev);
*/
static const char * trace_event_get_name(TraceEvent *ev);
-/**
- * trace_event_get_state:
- * @id: Event identifier name.
- *
- * Get the tracing state of an event, both static and the QEMU dynamic state.
- *
- * If the event has the disabled property, the check will have no performance
- * impact.
- */
-#define trace_event_get_state(id) \
- (trace_event_get_state_dynamic_by_id(id))
-
/**
* trace_event_get_state_backends:
* @id: Event identifier name.
--
2.55.0
^ permalink raw reply related [flat|nested] 34+ messages in thread* Re: [PATCH 00/20] trace: bugfixes, cleanups and optimizations
2026-10-01 15:12 [PATCH 00/20] trace: bugfixes, cleanups and optimizations Daniel P. Berrangé
` (19 preceding siblings ...)
2026-10-01 15:12 ` [PATCH 20/20] trace: remove 'trace_event_get_state' wrapper Daniel P. Berrangé
@ 2026-10-01 19:14 ` marcandre.lureau
20 siblings, 0 replies; 34+ messages in thread
From: marcandre.lureau @ 2026-10-01 19:14 UTC (permalink / raw)
To: Daniel P. Berrangé; +Cc: qemu-devel, Stefan Hajnoczi
Hi,
> This series started off with fixing some compile failures seen
> with dtrace and ust backends, and got somewhat out of hand as
> I looked more deeply at the trace code. So it ended up doing
> various bits of code cleanup and memory usage optimizations.
>
> The optimizations aren't huge against each individual binaries.
> There are too many scenarios to show the full set, but here
> are some binary size examples
>
> The current git master baseline for different enabled
> backends on the x86_64 emulator:
>
> nop 88546360
> dtrace 90604496
> ftrace 93265944
> log 93799528
> syslog 93962704
> simple 97064528
> ust 162999944
> dtrace,ftrace,log,syslog,simple,ust 174438088
>
> 'ust' has insanely high overhead in terms of binary sizes,
> inexplicably insane.
>
> 'ftrace/log/syslog' are all similar because their overhead
> is dominated by the printf() format strings which are
> identical in all.
>
> 'simple' is a bit worse because of the helper functions we
> must generated for each probe
>
> After this series is applied the results for x86_64 are
>
> nop 88510248
> dtrace 90576160
> ftrace 93156320
> log 93735064
> syslog 93853480
> simple 97050856
> ust 162957256
> dtrace,ftrace,log,syslog,simple,ust 174431128
>
> IOW, for 'dtrace', we save 28k, for 'log' we save 62k
>
> For the aarch64 binary, we see bigger saving in some
> cases:
>
> baseline dtrace 127610144
> baseline log 131050320
> trace dtrace 127459264
> trace log 130998872
>
> IOW, for 'dtrace' we save 150k, for 'log' we only save
> 50k. No clue why the saving is not so significant for
> the 'log' backend but not a big deal.
Need tracing.rst update, and maybe better commit message, but lgtm otherwise,
series:
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
--
Marc-André Lureau <marcandre.lureau@redhat.com>
^ permalink raw reply [flat|nested] 34+ messages in thread