diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2017-09-05 16:26:44 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-10-27 10:31:59 +0200 |
| commit | 0c1cbc18df9e38182a0604b15535699c84d7342a (patch) | |
| tree | 85c7d42284fd594af32ca8d176aa8fc44e618a60 /include/linux/io.h | |
| parent | 7f0ec32526d2446fdd79b0c6c6d08e64ef9fb1f3 (diff) | |
perf/core: Fix perf_event_read()
perf_event_read() has a number of issues regarding the timekeeping bits.
- The IPI didn't update group times when it found INACTIVE
- The direct call would not re-check ->state after taking ctx->lock
which can result in ->count and timestamps getting out of sync.
And we can make use of the ordering introduced for perf_event_stop()
to make it more accurate for ACTIVE.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/io.h')
0 files changed, 0 insertions, 0 deletions