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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-07-23 14:46:33 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-02 13:47:56 +0200 |
| commit | 9f498cc5be7e013d8d6e4c616980ed0ffc8680d2 (patch) | |
| tree | 25ef7a52d61ffd336c73b42dcf770424beb19cf3 /include/linux | |
| parent | e53c0994709166b111fbe9162d1a16ece7dfc45b (diff) | |
| download | op-kernel-dev-9f498cc5be7e013d8d6e4c616980ed0ffc8680d2.zip op-kernel-dev-9f498cc5be7e013d8d6e4c616980ed0ffc8680d2.tar.gz | |
perf_counter: Full task tracing
In order to be able to distinguish between no samples due to
inactivity and no samples due to task ended, Arjan asked for
PERF_EVENT_EXIT events. This is useful to the boot delay
instrumentation (bootchart) app.
This patch changes the PERF_EVENT_FORK to be emitted on every
clone, and adds PERF_EVENT_EXIT to be emitted on task exit,
after the task's counters have been closed.
This task tracing is controlled through: attr.comm || attr.mmap
and through the new attr.task field.
Suggested-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
[ cleaned up perf_counter.h a bit ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/perf_counter.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index bd15d7a..e604e6e 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -181,8 +181,9 @@ struct perf_counter_attr { freq : 1, /* use freq, not period */ inherit_stat : 1, /* per task counts */ enable_on_exec : 1, /* next exec enables */ + task : 1, /* trace fork/exit */ - __reserved_1 : 51; + __reserved_1 : 50; __u32 wakeup_events; /* wakeup every n events */ __u32 __reserved_2; @@ -311,6 +312,15 @@ enum perf_event_type { /* * struct { * struct perf_event_header header; + * u32 pid, ppid; + * u32 tid, ptid; + * }; + */ + PERF_EVENT_EXIT = 4, + + /* + * struct { + * struct perf_event_header header; * u64 time; * u64 id; * u64 stream_id; @@ -323,6 +333,7 @@ enum perf_event_type { * struct { * struct perf_event_header header; * u32 pid, ppid; + * u32 tid, ptid; * }; */ PERF_EVENT_FORK = 7, |
