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perf_counter: Add scale information to the mmap control page

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Add the needed time scale to the self-profile mmap information.

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 2009-06-22 14:34:35 +02:00 committed by Ingo Molnar
parent 41f95331b9
commit 7f8b4e4e09
2 changed files with 9 additions and 1 deletions
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4
include/linux/perf_counter.h
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@ -232,12 +232,14 @@ struct perf_counter_mmap_page {
__u32 lock; /* seqlock for synchronization */
__u32 index; /* hardware counter identifier */
__s64 offset; /* add to hardware counter value */
__u64 time_enabled; /* time counter active */
__u64 time_running; /* time counter on cpu */
/*
* Hole for extension of the self monitor capabilities
*/
__u64 __reserved[125]; /* align to 1k */
__u64 __reserved[123]; /* align to 1k */
/*
* Control data for the mmap() data buffer.

6
kernel/perf_counter.c
View file

@ -1782,6 +1782,12 @@ void perf_counter_update_userpage(struct perf_counter *counter)
if (counter->state == PERF_COUNTER_STATE_ACTIVE)
userpg->offset -= atomic64_read(&counter->hw.prev_count);
userpg->time_enabled = counter->total_time_enabled +
atomic64_read(&counter->child_total_time_enabled);
userpg->time_running = counter->total_time_running +
atomic64_read(&counter->child_total_time_running);
barrier();
++userpg->lock;
preempt_enable();