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perf_counter: Add PERF_EVENT_READ

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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>
This commit is contained in:
Peter Zijlstra 2009-06-23 20:13:11 +02:00 • committed by Ingo Molnar
parent 194002b274
commit 38b200d676
2 changed files with 80 additions and 4 deletions
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12
include/linux/perf_counter.h
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@ -334,6 +334,18 @@ 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_*