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perf: Update perf_event_type documentation

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Due to a discussion with Adrian I had a good look at the perf_event_type record
layout and found the documentation to be somewhat unclear.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20130716150907.GL23818@dyad.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2013-07-16 17:09:07 +02:00
committed by Ingo Molnar
parent 17f41571bb
commit a5cdd40c98
2 changed files with 33 additions and 16 deletions
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18
include/uapi/linux/perf_event.h
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@@ -478,6 +478,16 @@ enum perf_event_type {
* file will be supported by older perf tools, with these new optional
* fields being ignored.
*
* struct sample_id {
* { u32 pid, tid; } && PERF_SAMPLE_TID
* { u64 time; } && PERF_SAMPLE_TIME
* { u64 id; } && PERF_SAMPLE_ID
* { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
* { u32 cpu, res; } && PERF_SAMPLE_CPU
* } && perf_event_attr::sample_id_all
*/
/*
* The MMAP events record the PROT_EXEC mappings so that we can
* correlate userspace IPs to code. They have the following structure:
*
@@ -498,6 +508,7 @@ enum perf_event_type {
* struct perf_event_header header;
* u64 id;
* u64 lost;
* struct sample_id sample_id;
* };
*/
PERF_RECORD_LOST = 2,
@@ -508,6 +519,7 @@ enum perf_event_type {
*
* u32 pid, tid;
* char comm[];
* struct sample_id sample_id;
* };
*/
PERF_RECORD_COMM = 3,
@@ -518,6 +530,7 @@ enum perf_event_type {
* u32 pid, ppid;
* u32 tid, ptid;
* u64 time;
* struct sample_id sample_id;
* };
*/
PERF_RECORD_EXIT = 4,
@@ -528,6 +541,7 @@ enum perf_event_type {
* u64 time;
* u64 id;
* u64 stream_id;
* struct sample_id sample_id;
* };
*/
PERF_RECORD_THROTTLE = 5,
@@ -539,6 +553,7 @@ enum perf_event_type {
* u32 pid, ppid;
* u32 tid, ptid;
* u64 time;
* struct sample_id sample_id;
* };
*/
PERF_RECORD_FORK = 7,
@@ -549,6 +564,7 @@ enum perf_event_type {
* u32 pid, tid;
*
* struct read_format values;
* struct sample_id sample_id;
* };
*/
PERF_RECORD_READ = 8,
@@ -596,7 +612,7 @@ enum perf_event_type {
* u64 dyn_size; } && PERF_SAMPLE_STACK_USER
*
* { u64 weight; } && PERF_SAMPLE_WEIGHT
* { u64 data_src; } && PERF_SAMPLE_DATA_SRC
* { u64 data_src; } && PERF_SAMPLE_DATA_SRC
* };
*/
PERF_RECORD_SAMPLE = 9,