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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-06-23 20:13:11 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-25 21:39:07 +0200 |
| commit | 38b200d67636a30cb8dc1508137908e7a649b5c9 (patch) | |
| tree | 74f88d57a7f55075d4cd0b46690ff4b319dca642 /include | |
| parent | perf_counter, x86: Add mmap counter read support (diff) | |
| download | linux-38b200d67636a30cb8dc1508137908e7a649b5c9.tar.xz linux-38b200d67636a30cb8dc1508137908e7a649b5c9.zip | |
perf_counter: Add PERF_EVENT_READ
Provide a read() like event which can be used to log the
counter value at specific sites such as child->parent
folding on exit.
In order to be useful, we log the counter parent ID, not the
actual counter ID, since userspace can only relate parent
IDs to perf_counter_attr constructs.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/perf_counter.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index bcbf1c43ed42..6a384f04755a 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -335,6 +335,18 @@ enum perf_event_type { PERF_EVENT_FORK = 7, /* + * struct { + * struct perf_event_header header; + * u32 pid, tid; + * u64 value; + * { u64 time_enabled; } && PERF_FORMAT_ENABLED + * { u64 time_running; } && PERF_FORMAT_RUNNING + * { u64 parent_id; } && PERF_FORMAT_ID + * }; + */ + PERF_EVENT_READ = 8, + + /* * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field * will be PERF_SAMPLE_* * |