* [Qemu-devel] [PULL 1/7] trace: Allocate cpu->trace_dstate in place
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 2/7] trace: [tcg] Delay changes to dynamic state when translating Stefan Hajnoczi
` (6 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Lluís Vilanova, Emilio G . Cota,
Stefan Hajnoczi
From: Lluís Vilanova <vilanova@ac.upc.edu>
There's little point in dynamically allocating the bitmap if we
know at compile-time the max number of events we want to support.
Thus, make room in the struct for the bitmap, which will make things
easier later: this paves the way for upcoming changes, in which
we'll use a u32 to fully capture cpu->trace_dstate.
This change also increases performance by saving a dereference and
improving locality--note that this is important since upcoming work
makes reading this bitmap fairly common.
Signed-off-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 149915725977.6295.15069969323605305641.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/qom/cpu.h | 9 +++------
qom/cpu.c | 8 --------
trace/control.c | 9 ++++++++-
3 files changed, 11 insertions(+), 15 deletions(-)
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 04c31e6..5f188d4 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -259,6 +259,7 @@ typedef void (*run_on_cpu_func)(CPUState *cpu, run_on_cpu_data data);
struct qemu_work_item;
#define CPU_UNSET_NUMA_NODE_ID -1
+#define CPU_TRACE_DSTATE_MAX_EVENTS 32
/**
* CPUState:
@@ -370,12 +371,8 @@ struct CPUState {
struct KVMState *kvm_state;
struct kvm_run *kvm_run;
- /*
- * Used for events with 'vcpu' and *without* the 'disabled' properties.
- * Dynamically allocated based on bitmap requried to hold up to
- * trace_get_vcpu_event_count() entries.
- */
- unsigned long *trace_dstate;
+ /* Used for events with 'vcpu' and *without* the 'disabled' properties */
+ DECLARE_BITMAP(trace_dstate, CPU_TRACE_DSTATE_MAX_EVENTS);
/* TODO Move common fields from CPUArchState here. */
int cpu_index; /* used by alpha TCG */
diff --git a/qom/cpu.c b/qom/cpu.c
index a39ff6c..4f38db0 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -380,7 +380,6 @@ static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
static void cpu_common_initfn(Object *obj)
{
- uint32_t count;
CPUState *cpu = CPU(obj);
CPUClass *cc = CPU_GET_CLASS(obj);
@@ -395,18 +394,11 @@ static void cpu_common_initfn(Object *obj)
QTAILQ_INIT(&cpu->breakpoints);
QTAILQ_INIT(&cpu->watchpoints);
- count = trace_get_vcpu_event_count();
- if (count) {
- cpu->trace_dstate = bitmap_new(count);
- }
-
cpu_exec_initfn(cpu);
}
static void cpu_common_finalize(Object *obj)
{
- CPUState *cpu = CPU(obj);
- g_free(cpu->trace_dstate);
}
static int64_t cpu_common_get_arch_id(CPUState *cpu)
diff --git a/trace/control.c b/trace/control.c
index f5fb11d..82d8989 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -65,8 +65,15 @@ void trace_event_register_group(TraceEvent **events)
size_t i;
for (i = 0; events[i] != NULL; i++) {
events[i]->id = next_id++;
- if (events[i]->vcpu_id != TRACE_VCPU_EVENT_NONE) {
+ if (events[i]->vcpu_id == TRACE_VCPU_EVENT_NONE) {
+ continue;
+ }
+
+ if (likely(next_vcpu_id < CPU_TRACE_DSTATE_MAX_EVENTS)) {
events[i]->vcpu_id = next_vcpu_id++;
+ } else {
+ error_report("WARNING: too many vcpu trace events; dropping '%s'",
+ events[i]->name);
}
}
event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PULL 2/7] trace: [tcg] Delay changes to dynamic state when translating
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 1/7] trace: Allocate cpu->trace_dstate in place Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 3/7] exec: [tcg] Use different TBs according to the vCPU's dynamic tracing state Stefan Hajnoczi
` (5 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Lluís Vilanova, Emilio G . Cota,
Stefan Hajnoczi
From: Lluís Vilanova <vilanova@ac.upc.edu>
This keeps consistency across all decisions taken during translation
when the dynamic state of a vCPU is changed in the middle of translating
some guest code.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915750615.6295.3713699402253529487.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/qom/cpu.h | 3 +++
trace/control-target.c | 18 ++++++++++++++++--
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 5f188d4..25eefea 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -302,6 +302,8 @@ struct qemu_work_item;
* @kvm_fd: vCPU file descriptor for KVM.
* @work_mutex: Lock to prevent multiple access to queued_work_*.
* @queued_work_first: First asynchronous work pending.
+ * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes
+ * to @trace_dstate).
* @trace_dstate: Dynamic tracing state of events for this vCPU (bitmask).
*
* State of one CPU core or thread.
@@ -372,6 +374,7 @@ struct CPUState {
struct kvm_run *kvm_run;
/* Used for events with 'vcpu' and *without* the 'disabled' properties */
+ DECLARE_BITMAP(trace_dstate_delayed, CPU_TRACE_DSTATE_MAX_EVENTS);
DECLARE_BITMAP(trace_dstate, CPU_TRACE_DSTATE_MAX_EVENTS);
/* TODO Move common fields from CPUArchState here. */
diff --git a/trace/control-target.c b/trace/control-target.c
index 99a8ed5..31c2ed1 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -61,6 +61,13 @@ void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
}
}
+static void trace_event_synchronize_vcpu_state_dynamic(
+ CPUState *vcpu, run_on_cpu_data ignored)
+{
+ bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
+ CPU_TRACE_DSTATE_MAX_EVENTS);
+}
+
void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
TraceEvent *ev, bool state)
{
@@ -73,13 +80,20 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
if (state_pre != state) {
if (state) {
trace_events_enabled_count++;
- set_bit(vcpu_id, vcpu->trace_dstate);
+ set_bit(vcpu_id, vcpu->trace_dstate_delayed);
(*ev->dstate)++;
} else {
trace_events_enabled_count--;
- clear_bit(vcpu_id, vcpu->trace_dstate);
+ clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
(*ev->dstate)--;
}
+ /*
+ * Delay changes until next TB; we want all TBs to be built from a
+ * single set of dstate values to ensure consistency of generated
+ * tracing code.
+ */
+ async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
+ RUN_ON_CPU_NULL);
}
}
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PULL 3/7] exec: [tcg] Use different TBs according to the vCPU's dynamic tracing state
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 1/7] trace: Allocate cpu->trace_dstate in place Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 2/7] trace: [tcg] Delay changes to dynamic state when translating Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 4/7] trace: [tcg] Do not generate TCG code to trace dynamically-disabled events Stefan Hajnoczi
` (4 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Lluís Vilanova, Emilio G . Cota,
Stefan Hajnoczi
From: Lluís Vilanova <vilanova@ac.upc.edu>
Every vCPU now uses a separate set of TBs for each set of dynamic
tracing event state values. Each set of TBs can be used by any number of
vCPUs to maximize TB reuse when vCPUs have the same tracing state.
This feature is later used by tracetool to optimize tracing of guest
code events.
The maximum number of TB sets is defined as 2^E, where E is the number
of events that have the 'vcpu' property (their state is stored in
CPUState->trace_dstate).
For this to work, a change on the dynamic tracing state of a vCPU will
force it to flush its virtual TB cache (which is only indexed by
address), and fall back to the physical TB cache (which now contains the
vCPU's dynamic tracing state as part of the hashing function).
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915775266.6295.10060144081246467690.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/exec/exec-all.h | 3 +++
include/exec/tb-hash-xx.h | 7 +++++--
include/exec/tb-hash.h | 5 +++--
trace/control.h | 3 +++
accel/tcg/cpu-exec.c | 8 ++++++--
accel/tcg/translate-all.c | 11 +++++++++--
tcg/tcg-runtime.c | 3 ++-
tests/qht-bench.c | 2 +-
trace/control-target.c | 1 +
9 files changed, 33 insertions(+), 10 deletions(-)
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index bf8da2a..c09b365 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -330,6 +330,9 @@ struct TranslationBlock {
#define CF_USE_ICOUNT 0x20000
#define CF_IGNORE_ICOUNT 0x40000 /* Do not generate icount code */
+ /* Per-vCPU dynamic tracing state used to generate this TB */
+ uint32_t trace_vcpu_dstate;
+
uint16_t invalid;
void *tc_ptr; /* pointer to the translated code */
diff --git a/include/exec/tb-hash-xx.h b/include/exec/tb-hash-xx.h
index 2c40b5c..6cd3022 100644
--- a/include/exec/tb-hash-xx.h
+++ b/include/exec/tb-hash-xx.h
@@ -49,7 +49,7 @@
* contiguous in memory.
*/
static inline
-uint32_t tb_hash_func5(uint64_t a0, uint64_t b0, uint32_t e)
+uint32_t tb_hash_func6(uint64_t a0, uint64_t b0, uint32_t e, uint32_t f)
{
uint32_t v1 = TB_HASH_XX_SEED + PRIME32_1 + PRIME32_2;
uint32_t v2 = TB_HASH_XX_SEED + PRIME32_2;
@@ -78,11 +78,14 @@ uint32_t tb_hash_func5(uint64_t a0, uint64_t b0, uint32_t e)
v4 *= PRIME32_1;
h32 = rol32(v1, 1) + rol32(v2, 7) + rol32(v3, 12) + rol32(v4, 18);
- h32 += 20;
+ h32 += 24;
h32 += e * PRIME32_3;
h32 = rol32(h32, 17) * PRIME32_4;
+ h32 += f * PRIME32_3;
+ h32 = rol32(h32, 17) * PRIME32_4;
+
h32 ^= h32 >> 15;
h32 *= PRIME32_2;
h32 ^= h32 >> 13;
diff --git a/include/exec/tb-hash.h b/include/exec/tb-hash.h
index b1fe2d0..17b5ee0 100644
--- a/include/exec/tb-hash.h
+++ b/include/exec/tb-hash.h
@@ -58,9 +58,10 @@ static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
#endif /* CONFIG_SOFTMMU */
static inline
-uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags)
+uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags,
+ uint32_t trace_vcpu_dstate)
{
- return tb_hash_func5(phys_pc, pc, flags);
+ return tb_hash_func6(phys_pc, pc, flags, trace_vcpu_dstate);
}
#endif
diff --git a/trace/control.h b/trace/control.h
index 4ea53e2..b931824 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -165,6 +165,9 @@ void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
* Set the dynamic tracing state of an event for the given vCPU.
*
* Pre-condition: trace_event_get_vcpu_state_static(ev) == true
+ *
+ * Note: Changes for execution-time events with the 'tcg' property will not be
+ * propagated until the next TB is executed (iff executing in TCG mode).
*/
void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
TraceEvent *ev, bool state);
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 3581618..d84b01d 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -280,6 +280,7 @@ struct tb_desc {
CPUArchState *env;
tb_page_addr_t phys_page1;
uint32_t flags;
+ uint32_t trace_vcpu_dstate;
};
static bool tb_cmp(const void *p, const void *d)
@@ -291,6 +292,7 @@ static bool tb_cmp(const void *p, const void *d)
tb->page_addr[0] == desc->phys_page1 &&
tb->cs_base == desc->cs_base &&
tb->flags == desc->flags &&
+ tb->trace_vcpu_dstate == desc->trace_vcpu_dstate &&
!atomic_read(&tb->invalid)) {
/* check next page if needed */
if (tb->page_addr[1] == -1) {
@@ -319,10 +321,11 @@ TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
desc.env = (CPUArchState *)cpu->env_ptr;
desc.cs_base = cs_base;
desc.flags = flags;
+ desc.trace_vcpu_dstate = *cpu->trace_dstate;
desc.pc = pc;
phys_pc = get_page_addr_code(desc.env, pc);
desc.phys_page1 = phys_pc & TARGET_PAGE_MASK;
- h = tb_hash_func(phys_pc, pc, flags);
+ h = tb_hash_func(phys_pc, pc, flags, *cpu->trace_dstate);
return qht_lookup(&tcg_ctx.tb_ctx.htable, tb_cmp, &desc, h);
}
@@ -342,7 +345,8 @@ static inline TranslationBlock *tb_find(CPUState *cpu,
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)]);
if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
- tb->flags != flags)) {
+ tb->flags != flags ||
+ tb->trace_vcpu_dstate != *cpu->trace_dstate)) {
tb = tb_htable_lookup(cpu, pc, cs_base, flags);
if (!tb) {
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 4e1831c..090ebad 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -54,6 +54,7 @@
#include "exec/tb-hash.h"
#include "translate-all.h"
#include "qemu/bitmap.h"
+#include "qemu/error-report.h"
#include "qemu/timer.h"
#include "qemu/main-loop.h"
#include "exec/log.h"
@@ -112,6 +113,11 @@ typedef struct PageDesc {
#define V_L2_BITS 10
#define V_L2_SIZE (1 << V_L2_BITS)
+/* Make sure all possible CPU event bits fit in tb->trace_vcpu_dstate */
+QEMU_BUILD_BUG_ON(CPU_TRACE_DSTATE_MAX_EVENTS >
+ sizeof(((TranslationBlock *)0)->trace_vcpu_dstate)
+ * BITS_PER_BYTE);
+
/*
* L1 Mapping properties
*/
@@ -1071,7 +1077,7 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
/* remove the TB from the hash list */
phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
- h = tb_hash_func(phys_pc, tb->pc, tb->flags);
+ h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->trace_vcpu_dstate);
qht_remove(&tcg_ctx.tb_ctx.htable, tb, h);
/* remove the TB from the page list */
@@ -1216,7 +1222,7 @@ static void tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
}
/* add in the hash table */
- h = tb_hash_func(phys_pc, tb->pc, tb->flags);
+ h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->trace_vcpu_dstate);
qht_insert(&tcg_ctx.tb_ctx.htable, tb, h);
#ifdef DEBUG_TB_CHECK
@@ -1262,6 +1268,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;
+ tb->trace_vcpu_dstate = *cpu->trace_dstate;
tb->invalid = false;
#ifdef CONFIG_PROFILER
diff --git a/tcg/tcg-runtime.c b/tcg/tcg-runtime.c
index ec3a34e..3e23649 100644
--- a/tcg/tcg-runtime.c
+++ b/tcg/tcg-runtime.c
@@ -158,7 +158,8 @@ void *HELPER(lookup_tb_ptr)(CPUArchState *env, target_ulong addr)
if (unlikely(!(tb
&& tb->pc == addr
&& tb->cs_base == cs_base
- && tb->flags == flags))) {
+ && tb->flags == flags
+ && tb->trace_vcpu_dstate == *cpu->trace_dstate))) {
tb = tb_htable_lookup(cpu, addr, cs_base, flags);
if (!tb) {
return tcg_ctx.code_gen_epilogue;
diff --git a/tests/qht-bench.c b/tests/qht-bench.c
index 2afa09d..11c1cec 100644
--- a/tests/qht-bench.c
+++ b/tests/qht-bench.c
@@ -103,7 +103,7 @@ static bool is_equal(const void *obj, const void *userp)
static inline uint32_t h(unsigned long v)
{
- return tb_hash_func5(v, 0, 0);
+ return tb_hash_func6(v, 0, 0, 0);
}
/*
diff --git a/trace/control-target.c b/trace/control-target.c
index 31c2ed1..4e36101 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -66,6 +66,7 @@ static void trace_event_synchronize_vcpu_state_dynamic(
{
bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
CPU_TRACE_DSTATE_MAX_EVENTS);
+ cpu_tb_jmp_cache_clear(vcpu);
}
void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PULL 4/7] trace: [tcg] Do not generate TCG code to trace dynamically-disabled events
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
` (2 preceding siblings ...)
2017-07-17 12:11 ` [Qemu-devel] [PULL 3/7] exec: [tcg] Use different TBs according to the vCPU's dynamic tracing state Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 5/7] trace: [tcg, trivial] Re-align generated code Stefan Hajnoczi
` (3 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Lluís Vilanova, Emilio G . Cota,
Stefan Hajnoczi
From: Lluís Vilanova <vilanova@ac.upc.edu>
If an event is dynamically disabled, the TCG code that calls the
execution-time tracer is not generated.
Removes the overheads of execution-time tracers for dynamically disabled
events. As a bonus, also avoids checking the event state when the
execution-time tracer is called from TCG-generated code (since otherwise
TCG would simply not call it).
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915799921.6295.13067154430923434035.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
scripts/tracetool/__init__.py | 3 ++-
scripts/tracetool/format/h.py | 26 +++++++++++++++++++-------
scripts/tracetool/format/tcg_h.py | 21 +++++++++++++++++----
scripts/tracetool/format/tcg_helper_c.py | 5 +++--
4 files changed, 41 insertions(+), 14 deletions(-)
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 1ffbc1d..d4c204a 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -6,7 +6,7 @@ Machinery for generating tracing-related intermediate files.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -268,6 +268,7 @@ class Event(object):
return self._FMT.findall(self.fmt)
QEMU_TRACE = "trace_%(name)s"
+ QEMU_TRACE_NOCHECK = "_nocheck__" + QEMU_TRACE
QEMU_TRACE_TCG = QEMU_TRACE + "_tcg"
QEMU_DSTATE = "_TRACE_%(NAME)s_DSTATE"
QEMU_EVENT = "_TRACE_%(NAME)s_EVENT"
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 3682f4e..aecf249 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -6,7 +6,7 @@ trace/generated-tracers.h
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -49,6 +49,19 @@ def generate(events, backend, group):
backend.generate_begin(events, group)
for e in events:
+ # tracer without checks
+ out('',
+ 'static inline void %(api)s(%(args)s)',
+ '{',
+ api=e.api(e.QEMU_TRACE_NOCHECK),
+ args=e.args)
+
+ if "disable" not in e.properties:
+ backend.generate(e, group)
+
+ out('}')
+
+ # tracer wrapper with checks (per-vCPU tracing)
if "vcpu" in e.properties:
trace_cpu = next(iter(e.args))[1]
cond = "trace_event_get_vcpu_state(%(cpu)s,"\
@@ -63,16 +76,15 @@ def generate(events, backend, group):
'static inline void %(api)s(%(args)s)',
'{',
' if (%(cond)s) {',
+ ' %(api_nocheck)s(%(names)s);',
+ ' }',
+ '}',
api=e.api(),
+ api_nocheck=e.api(e.QEMU_TRACE_NOCHECK),
args=e.args,
+ names=", ".join(e.args.names()),
cond=cond)
- if "disable" not in e.properties:
- backend.generate(e, group)
-
- out(' }',
- '}')
-
backend.generate_end(events, group)
out('#endif /* TRACE_%s_GENERATED_TRACERS_H */' % group.upper())
diff --git a/scripts/tracetool/format/tcg_h.py b/scripts/tracetool/format/tcg_h.py
index db55f52..1651cc3 100644
--- a/scripts/tracetool/format/tcg_h.py
+++ b/scripts/tracetool/format/tcg_h.py
@@ -6,7 +6,7 @@ Generate .h file for TCG code generation.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -46,7 +46,7 @@ def generate(events, backend, group):
for e in events:
# just keep one of them
- if "tcg-trans" not in e.properties:
+ if "tcg-exec" not in e.properties:
continue
out('static inline void %(name_tcg)s(%(args)s)',
@@ -58,12 +58,25 @@ def generate(events, backend, group):
args_trans = e.original.event_trans.args
args_exec = tracetool.vcpu.transform_args(
"tcg_helper_c", e.original.event_exec, "wrapper")
+ if "vcpu" in e.properties:
+ trace_cpu = e.args.names()[0]
+ cond = "trace_event_get_vcpu_state(%(cpu)s,"\
+ " TRACE_%(id)s)"\
+ % dict(
+ cpu=trace_cpu,
+ id=e.original.event_exec.name.upper())
+ else:
+ cond = "true"
+
out(' %(name_trans)s(%(argnames_trans)s);',
- ' gen_helper_%(name_exec)s(%(argnames_exec)s);',
+ ' if (%(cond)s) {',
+ ' gen_helper_%(name_exec)s(%(argnames_exec)s);',
+ ' }',
name_trans=e.original.event_trans.api(e.QEMU_TRACE),
name_exec=e.original.event_exec.api(e.QEMU_TRACE),
argnames_trans=", ".join(args_trans.names()),
- argnames_exec=", ".join(args_exec.names()))
+ argnames_exec=", ".join(args_exec.names()),
+ cond=cond)
out('}')
diff --git a/scripts/tracetool/format/tcg_helper_c.py b/scripts/tracetool/format/tcg_helper_c.py
index ec7acbe..bbbd6ad 100644
--- a/scripts/tracetool/format/tcg_helper_c.py
+++ b/scripts/tracetool/format/tcg_helper_c.py
@@ -6,7 +6,7 @@ Generate trace/generated-helpers.c.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -71,10 +71,11 @@ def generate(events, backend, group):
out('void %(name_tcg)s(%(args_api)s)',
'{',
+ # NOTE: the check was already performed at TCG-generation time
' %(name)s(%(args_call)s);',
'}',
name_tcg="helper_%s_proxy" % e.api(),
- name=e.api(),
+ name=e.api(e.QEMU_TRACE_NOCHECK),
args_api=e_args_api,
args_call=", ".join(e_args_call.casted()),
)
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PULL 5/7] trace: [tcg, trivial] Re-align generated code
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
` (3 preceding siblings ...)
2017-07-17 12:11 ` [Qemu-devel] [PULL 4/7] trace: [tcg] Do not generate TCG code to trace dynamically-disabled events Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 6/7] trace: [trivial] Statically enable all guest events Stefan Hajnoczi
` (2 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Lluís Vilanova, Emilio G . Cota,
Stefan Hajnoczi
From: Lluís Vilanova <vilanova@ac.upc.edu>
Last patch removed a nesting level in generated code. Re-align all code
generated by backends to be 4-column aligned.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915824586.6295.17820926011082409033.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
scripts/tracetool/backend/dtrace.py | 4 ++--
scripts/tracetool/backend/ftrace.py | 20 ++++++++++----------
scripts/tracetool/backend/log.py | 19 ++++++++++---------
scripts/tracetool/backend/simple.py | 4 ++--
scripts/tracetool/backend/syslog.py | 6 +++---
scripts/tracetool/backend/ust.py | 4 ++--
6 files changed, 29 insertions(+), 28 deletions(-)
diff --git a/scripts/tracetool/backend/dtrace.py b/scripts/tracetool/backend/dtrace.py
index c469cbd..c6812b7 100644
--- a/scripts/tracetool/backend/dtrace.py
+++ b/scripts/tracetool/backend/dtrace.py
@@ -6,7 +6,7 @@ DTrace/SystemTAP backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -46,6 +46,6 @@ def generate_h_begin(events, group):
def generate_h(event, group):
- out(' QEMU_%(uppername)s(%(argnames)s);',
+ out(' QEMU_%(uppername)s(%(argnames)s);',
uppername=event.name.upper(),
argnames=", ".join(event.args.names()))
diff --git a/scripts/tracetool/backend/ftrace.py b/scripts/tracetool/backend/ftrace.py
index db9fe7a..dd0eda4 100644
--- a/scripts/tracetool/backend/ftrace.py
+++ b/scripts/tracetool/backend/ftrace.py
@@ -29,17 +29,17 @@ def generate_h(event, group):
if len(event.args) > 0:
argnames = ", " + argnames
- out(' {',
- ' char ftrace_buf[MAX_TRACE_STRLEN];',
- ' int unused __attribute__ ((unused));',
- ' int trlen;',
- ' if (trace_event_get_state(%(event_id)s)) {',
- ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
- ' "%(name)s " %(fmt)s "\\n" %(argnames)s);',
- ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
- ' unused = write(trace_marker_fd, ftrace_buf, trlen);',
- ' }',
+ out(' {',
+ ' char ftrace_buf[MAX_TRACE_STRLEN];',
+ ' int unused __attribute__ ((unused));',
+ ' int trlen;',
+ ' if (trace_event_get_state(%(event_id)s)) {',
+ ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
+ ' "%(name)s " %(fmt)s "\\n" %(argnames)s);',
+ ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
+ ' unused = write(trace_marker_fd, ftrace_buf, trlen);',
' }',
+ ' }',
name=event.name,
args=event.args,
event_id="TRACE_" + event.name.upper(),
diff --git a/scripts/tracetool/backend/log.py b/scripts/tracetool/backend/log.py
index 4f4a4d3..54f0a69 100644
--- a/scripts/tracetool/backend/log.py
+++ b/scripts/tracetool/backend/log.py
@@ -6,7 +6,7 @@ Stderr built-in backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -35,14 +35,15 @@ def generate_h(event, group):
else:
cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
- out(' if (%(cond)s) {',
- ' struct timeval _now;',
- ' gettimeofday(&_now, NULL);',
- ' qemu_log_mask(LOG_TRACE, "%%d@%%zd.%%06zd:%(name)s " %(fmt)s "\\n",',
- ' getpid(),',
- ' (size_t)_now.tv_sec, (size_t)_now.tv_usec',
- ' %(argnames)s);',
- ' }',
+ out(' if (%(cond)s) {',
+ ' struct timeval _now;',
+ ' gettimeofday(&_now, NULL);',
+ ' qemu_log_mask(LOG_TRACE,',
+ ' "%%d@%%zd.%%06zd:%(name)s " %(fmt)s "\\n",',
+ ' getpid(),',
+ ' (size_t)_now.tv_sec, (size_t)_now.tv_usec',
+ ' %(argnames)s);',
+ ' }',
cond=cond,
name=event.name,
fmt=event.fmt.rstrip("\n"),
diff --git a/scripts/tracetool/backend/simple.py b/scripts/tracetool/backend/simple.py
index 4acc06e..f983670 100644
--- a/scripts/tracetool/backend/simple.py
+++ b/scripts/tracetool/backend/simple.py
@@ -6,7 +6,7 @@ Simple built-in backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -37,7 +37,7 @@ def generate_h_begin(events, group):
def generate_h(event, group):
- out(' _simple_%(api)s(%(args)s);',
+ out(' _simple_%(api)s(%(args)s);',
api=event.api(),
args=", ".join(event.args.names()))
diff --git a/scripts/tracetool/backend/syslog.py b/scripts/tracetool/backend/syslog.py
index b8ff279..1ce627f 100644
--- a/scripts/tracetool/backend/syslog.py
+++ b/scripts/tracetool/backend/syslog.py
@@ -35,9 +35,9 @@ def generate_h(event, group):
else:
cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
- out(' if (%(cond)s) {',
- ' syslog(LOG_INFO, "%(name)s " %(fmt)s %(argnames)s);',
- ' }',
+ out(' if (%(cond)s) {',
+ ' syslog(LOG_INFO, "%(name)s " %(fmt)s %(argnames)s);',
+ ' }',
cond=cond,
name=event.name,
fmt=event.fmt.rstrip("\n"),
diff --git a/scripts/tracetool/backend/ust.py b/scripts/tracetool/backend/ust.py
index 52ce892..2adaf54 100644
--- a/scripts/tracetool/backend/ust.py
+++ b/scripts/tracetool/backend/ust.py
@@ -6,7 +6,7 @@ LTTng User Space Tracing backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -35,6 +35,6 @@ def generate_h(event, group):
if len(event.args) > 0:
argnames = ", " + argnames
- out(' tracepoint(qemu, %(name)s%(tp_args)s);',
+ out(' tracepoint(qemu, %(name)s%(tp_args)s);',
name=event.name,
tp_args=argnames)
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PULL 6/7] trace: [trivial] Statically enable all guest events
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
` (4 preceding siblings ...)
2017-07-17 12:11 ` [Qemu-devel] [PULL 5/7] trace: [tcg, trivial] Re-align generated code Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-17 12:11 ` [Qemu-devel] [PULL 7/7] trace: update old trace events in docs Stefan Hajnoczi
2017-07-18 8:16 ` [Qemu-devel] [PULL 0/7] Tracing patches Peter Maydell
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Lluís Vilanova, Emilio G . Cota,
Stefan Hajnoczi
From: Lluís Vilanova <vilanova@ac.upc.edu>
The existing optimizations makes it feasible to have them available on all
builds.
Some quick'n'dirty numbers with 400.perlbench (SPECcpu2006) on the train input
(medium size - suns.pl) and the guest_mem_before event:
* vanilla, statically disabled
real 0m2,259s
user 0m2,252s
sys 0m0,004s
* vanilla, statically enabled (overhead: 2.18x)
real 0m4,921s
user 0m4,912s
sys 0m0,008s
* multi-tb, statically disabled (overhead: 0.99x) [within noise range]
real 0m2,228s
user 0m2,216s
sys 0m0,008s
* multi-tb, statically enabled (overhead: 0.99x) [within noise range]
real 0m2,229s
user 0m2,224s
sys 0m0,004s
Now enabling all events when booting an ARM system that immediately shuts down
(https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg04085.html):
* vanilla, statically disabled
real 0m32,153s
user 0m31,276s
sys 0m0,108s
* vanilla, statically enabled (overhead: 1.35x)
real 0m43,507s
user 0m42,680s
sys 0m0,168s
* multi-tb, statically disabled (overhead: 1.03x)
real 0m32,993s
user 0m32,516s
sys 0m0,104s
* multi-tb, statically enabled (overhead: 1.00x) [within noise range]
real 0m32,110s
user 0m31,176s
sys 0m0,156s
And finally enabling all events using Emilio's dbt-bench
(where orig == vanilla, new == multi-tb):
NBench score; higher is better
180 +-+--------+----------+----------+---------+----------+----------+----------+----------+----------+---------+----------+--------+-+
| |
| *** $$$$%% orig |
160 +-+....................................*.*.$..$.%............................................................orig-enabled +-+
| * * $ $ % new |
140 +-+....................................*.*.$..$.%............................................................new-disabled.......+-+
| * * $ $ % |
| * * $ $ % |
120 +-+....................................*.*.$..$.%...............................................................................+-+
| * * $ $ % |
| * * $ $ % |
100 +-+....................................*.*.$..$.%.....$$$%%%....................................................................+-+
| * * $ $ % *** $ $ % *** $$$%% |
80 +-+....................................*.*.$..$.%.*.*.$.$..%.*.*.$.$.%..........................................................+-+
| * * $ $ % * * $ $ % * * $ $ % |
| * * $ $ % * * $ $ % * * $ $ % |
60 +-+.........................***..$$$%%.*.*##..$.%.*.*.$.$..%.*.*.$.$.%..***.$$$%%...............................................+-+
| **** $$$%% * * $ $ % * * # $ % * *## $ % * * $ $ % * * $ $ % |
| * * $ $ % * * $ $ % * * # $ % * * # $ % * *## $ % * * $ $ % |
40 +-+..............*..*.$.$.%.*.*..$.$.%.*.*.#..$.%.*.*.#.$..%.*.*.#.$.%..*.*.$.$.%...............................................+-+
| * * $ $ % * * $ $ % * * # $ % * * # $ % * * # $ % * *## $ % *** $$$%%% |
20 +-+....***.$$$%%.*..*##.$.%.*.*###.$.%.*.*.#..$.%.*.*.#.$..%.*.*.#.$.%..*.*.#.$.%..................................*.*.$.$..%...+-+
| * *## $ % * * # $ % * * # $ % * * # $ % * * # $ % * * # $ % * * # $ % * *## $ % |
| * * # $ % * * # $ % * * # $ % * * # $ % * * # $ % * * # $ % * * # $ % ***###$$%% ***##$$$%% * * # $ % |
0 +-+----***##$$%%-****##$$%%-***###$$%%-***##$$$%%-***##$$%%%-***##$$%%--***##$$%%-****##$$%%-***###$$%%-***##$$$%%-***##$$%%%---+-+
NUMERIC SORTSTRING SORT BITFIEFP EMULATION ASSIGNMENT IDEA HUFFMAN FOURIER NEURLU DECOMPOSITION gmean
png: http://imgur.com/a/8XG5S
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915849243.6295.4484103824675839071.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
trace-events | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/trace-events b/trace-events
index bae63fd..f9dbd7f 100644
--- a/trace-events
+++ b/trace-events
@@ -106,7 +106,7 @@ vcpu guest_cpu_reset(void)
#
# Mode: user, softmmu
# Targets: TCG(all)
-disable vcpu tcg guest_mem_before(TCGv vaddr, uint8_t info) "info=%d", "vaddr=0x%016"PRIx64" info=%d"
+vcpu tcg guest_mem_before(TCGv vaddr, uint8_t info) "info=%d", "vaddr=0x%016"PRIx64" info=%d"
# @num: System call number.
# @arg*: System call argument value.
@@ -115,7 +115,7 @@ disable vcpu tcg guest_mem_before(TCGv vaddr, uint8_t info) "info=%d", "vaddr=0x
#
# Mode: user
# Targets: TCG(all)
-disable vcpu guest_user_syscall(uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8) "num=0x%016"PRIx64" arg1=0x%016"PRIx64" arg2=0x%016"PRIx64" arg3=0x%016"PRIx64" arg4=0x%016"PRIx64" arg5=0x%016"PRIx64" arg6=0x%016"PRIx64" arg7=0x%016"PRIx64" arg8=0x%016"PRIx64
+vcpu guest_user_syscall(uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8) "num=0x%016"PRIx64" arg1=0x%016"PRIx64" arg2=0x%016"PRIx64" arg3=0x%016"PRIx64" arg4=0x%016"PRIx64" arg5=0x%016"PRIx64" arg6=0x%016"PRIx64" arg7=0x%016"PRIx64" arg8=0x%016"PRIx64
# @num: System call number.
# @ret: System call result value.
@@ -124,4 +124,4 @@ disable vcpu guest_user_syscall(uint64_t num, uint64_t arg1, uint64_t arg2, uint
#
# Mode: user
# Targets: TCG(all)
-disable vcpu guest_user_syscall_ret(uint64_t num, uint64_t ret) "num=0x%016"PRIx64" ret=0x%016"PRIx64
+vcpu guest_user_syscall_ret(uint64_t num, uint64_t ret) "num=0x%016"PRIx64" ret=0x%016"PRIx64
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [Qemu-devel] [PULL 7/7] trace: update old trace events in docs
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
` (5 preceding siblings ...)
2017-07-17 12:11 ` [Qemu-devel] [PULL 6/7] trace: [trivial] Statically enable all guest events Stefan Hajnoczi
@ 2017-07-17 12:11 ` Stefan Hajnoczi
2017-07-18 8:16 ` [Qemu-devel] [PULL 0/7] Tracing patches Peter Maydell
7 siblings, 0 replies; 11+ messages in thread
From: Stefan Hajnoczi @ 2017-07-17 12:11 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Maydell, Stefan Hajnoczi
Commit c5f1ad429cdf26023cf331075a7d327708e3db6d ("block: Remove
bdrv_aio_readv/writev/flush()") removed
bdrv_aio_readv()/bdrv_aio_writev() so the example in the tracing
documentation is no longer valid.
Reported-by: Wang Dong <dongdwdw@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20170714133111.27359-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
docs/devel/tracing.txt | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/docs/devel/tracing.txt b/docs/devel/tracing.txt
index 8c0029b..5768a0b 100644
--- a/docs/devel/tracing.txt
+++ b/docs/devel/tracing.txt
@@ -14,8 +14,7 @@ for debugging, profiling, and observing execution.
2. Create a file with the events you want to trace:
- echo bdrv_aio_readv > /tmp/events
- echo bdrv_aio_writev >> /tmp/events
+ echo memory_region_ops_read >/tmp/events
3. Run the virtual machine to produce a trace file:
--
2.9.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [Qemu-devel] [PULL 0/7] Tracing patches
2017-07-17 12:11 [Qemu-devel] [PULL 0/7] Tracing patches Stefan Hajnoczi
` (6 preceding siblings ...)
2017-07-17 12:11 ` [Qemu-devel] [PULL 7/7] trace: update old trace events in docs Stefan Hajnoczi
@ 2017-07-18 8:16 ` Peter Maydell
7 siblings, 0 replies; 11+ messages in thread
From: Peter Maydell @ 2017-07-18 8:16 UTC (permalink / raw)
To: Stefan Hajnoczi; +Cc: QEMU Developers
On 17 July 2017 at 13:11, Stefan Hajnoczi <stefanha@redhat.com> wrote:
> The following changes since commit 4871b51b9241b10f4fd8e04bbb21577886795e25:
>
> vmgenid-test: use boot-sector infrastructure (2017-07-14 17:03:03 +0100)
>
> are available in the git repository at:
>
> git://github.com/stefanha/qemu.git tags/tracing-pull-request
>
> for you to fetch changes up to 304187c51cfe1ffda1afc9b86c4ccae1cbac68cb:
>
> trace: update old trace events in docs (2017-07-17 13:11:13 +0100)
>
> ----------------------------------------------------------------
>
> ----------------------------------------------------------------
>
> Lluís Vilanova (6):
> trace: Allocate cpu->trace_dstate in place
> trace: [tcg] Delay changes to dynamic state when translating
> exec: [tcg] Use different TBs according to the vCPU's dynamic tracing
> state
> trace: [tcg] Do not generate TCG code to trace dynamically-disabled
> events
> trace: [tcg, trivial] Re-align generated code
> trace: [trivial] Statically enable all guest events
>
> Stefan Hajnoczi (1):
> trace: update old trace events in docs
>
Applied, thanks.
-- PMM
^ permalink raw reply [flat|nested] 11+ messages in thread