[PATCH V2 03/22] perf tools: Add user events for Instruction Tracing

Adrian Hunter
2014-11-20T13:25:32Z

Add two user events for Instruction Tracing.

PERF_RECORD_ITRACE_INFO contains metadata,
consisting primarily the type of the
Instruction Tracing data plus some amount
of architecture-specific information.
There should be only one
PERF_RECORD_ITRACE_INFO event.

PERF_RECORD_ITRACE identifies Instruction
Tracing data copied from the mmapped
Instruction Tracing region. The actual
data is not part of the event but
immediately follows it.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/event.c | 2 ++
tools/perf/util/event.h | 22 +++++++++++++++
tools/perf/util/session.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/tool.h | 9 ++++++-
4 files changed, 101 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 6c6d044..efe6475 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -29,6 +29,8 @@ static const char *perf_event__names[] = {
[PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
[PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
[PERF_RECORD_ID_INDEX] = "ID_INDEX",
+ [PERF_RECORD_ITRACE_INFO] = "ITRACE_INFO",
+ [PERF_RECORD_ITRACE] = "ITRACE",
};

const char *perf_event__name(unsigned int id)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 09b9e8d..a093d56 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -215,6 +215,8 @@ enum perf_user_event_type { /* above any possible kernel type */
PERF_RECORD_HEADER_BUILD_ID = 67,
PERF_RECORD_FINISHED_ROUND = 68,
PERF_RECORD_ID_INDEX = 69,
+ PERF_RECORD_ITRACE_INFO = 70,
+ PERF_RECORD_ITRACE = 71,
PERF_RECORD_HEADER_MAX
};

@@ -280,6 +282,24 @@ struct id_index_event {
struct id_index_entry entries[0];
};

+struct itrace_info_event {
+ struct perf_event_header header;
+ u32 type;
+ u32 reserved__; /* For alignment */
+ u64 priv[];
+};
+
+struct itrace_event {
+ struct perf_event_header header;
+ u64 size;
+ u64 offset;
+ u64 reference;
+ u32 idx;
+ u32 tid;
+ u32 cpu;
+ u32 reserved__; /* For alignment */
+};
+
union perf_event {
struct perf_event_header header;
struct mmap_event mmap;
@@ -295,6 +315,8 @@ union perf_event {
struct tracing_data_event tracing_data;
struct build_id_event build_id;
struct id_index_event id_index;
+ struct itrace_info_event itrace_info;
+ struct itrace_event itrace;
};

void perf_event__print_totals(void);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 6ac62ae..6f56afb 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -237,6 +237,40 @@ static int process_id_index_stub(struct perf_tool *tool __maybe_unused,
return 0;
}

+static int process_event_itrace_info_stub(struct perf_tool *tool __maybe_unused,
+ union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ dump_printf(": unhandled!\n");
+ return 0;
+}
+
+static int skipn(int fd, off_t n)
+{
+ char buf[4096];
+ ssize_t ret;
+
+ while (n > 0) {
+ ret = read(fd, buf, MIN(n, sizeof(buf)));
+ if (ret <= 0)
+ return ret;
+ n -= ret;
+ }
+
+ return 0;
+}
+
+static s64 process_event_itrace_stub(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_session *session
+ __maybe_unused)
+{
+ dump_printf(": unhandled!\n");
+ if (perf_data_file__is_pipe(session->file))
+ skipn(perf_data_file__fd(session->file), event->itrace.size);
+ return event->itrace.size;
+}
+
void perf_tool__fill_defaults(struct perf_tool *tool)
{
if (tool->sample == NULL)
@@ -273,6 +307,10 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
}
if (tool->id_index == NULL)
tool->id_index = process_id_index_stub;
+ if (tool->itrace_info == NULL)
+ tool->itrace_info = process_event_itrace_info_stub;
+ if (tool->itrace == NULL)
+ tool->itrace = process_event_itrace_stub;
}

static void swap_sample_id_all(union perf_event *event, void *data)
@@ -453,6 +491,29 @@ static void perf_event__tracing_data_swap(union perf_event *event,
event->tracing_data.size = bswap_32(event->tracing_data.size);
}

+static void perf_event__itrace_info_swap(union perf_event *event,
+ bool sample_id_all __maybe_unused)
+{
+ size_t size;
+
+ event->itrace_info.type = bswap_32(event->itrace_info.type);
+
+ size = event->header.size;
+ size -= (void *)&event->itrace_info.priv - (void *)event;
+ mem_bswap_64(event->itrace_info.priv, size);
+}
+
+static void perf_event__itrace_swap(union perf_event *event,
+ bool sample_id_all __maybe_unused)
+{
+ event->itrace.size = bswap_64(event->itrace.size);
+ event->itrace.offset = bswap_64(event->itrace.offset);
+ event->itrace.reference = bswap_64(event->itrace.reference);
+ event->itrace.idx = bswap_32(event->itrace.idx);
+ event->itrace.tid = bswap_32(event->itrace.tid);
+ event->itrace.cpu = bswap_32(event->itrace.cpu);
+}
+
typedef void (*perf_event__swap_op)(union perf_event *event,
bool sample_id_all);

@@ -472,6 +533,8 @@ static perf_event__swap_op perf_event__swap_ops[] = {
[PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
[PERF_RECORD_HEADER_BUILD_ID] = NULL,
[PERF_RECORD_ID_INDEX] = perf_event__all64_swap,
+ [PERF_RECORD_ITRACE_INFO] = perf_event__itrace_info_swap,
+ [PERF_RECORD_ITRACE] = perf_event__itrace_swap,
[PERF_RECORD_HEADER_MAX] = NULL,
};

@@ -936,6 +999,12 @@ static s64 perf_session__process_user_event(struct perf_session *session,
return tool->finished_round(tool, event, session);
case PERF_RECORD_ID_INDEX:
return tool->id_index(tool, event, session);
+ case PERF_RECORD_ITRACE_INFO:
+ return tool->itrace_info(tool, event, session);
+ case PERF_RECORD_ITRACE:
+ /* setup for reading amidst mmap */
+ lseek(fd, file_offset + event->header.size, SEEK_SET);
+ return tool->itrace(tool, event, session);
default:
return -EINVAL;
}
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index bb2708b..b734c1a 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -3,6 +3,8 @@

#include <stdbool.h>

+#include <linux/types.h>
+
struct perf_session;
union perf_event;
struct perf_evlist;
@@ -25,6 +27,9 @@ typedef int (*event_attr_op)(struct perf_tool *tool,
typedef int (*event_op2)(struct perf_tool *tool, union perf_event *event,
struct perf_session *session);

+typedef s64 (*event_op3)(struct perf_tool *tool, union perf_event *event,
+ struct perf_session *session);
+
struct perf_tool {
event_sample sample,
read;
@@ -40,7 +45,9 @@ struct perf_tool {
event_op2 tracing_data;
event_op2 finished_round,
build_id,
- id_index;
+ id_index,
+ itrace_info;
+ event_op3 itrace;
bool ordered_events;
bool ordering_requires_timestamps;
};
--
1.9.1