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| author | eranian@google.com <eranian@google.com> | 2010-03-10 22:26:05 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-11 15:23:28 +0100 |
| commit | 9b33fa6ba0e2f90fdf407501db801c2511121564 (patch) | |
| tree | f5314e450afae1f1d4a9feadb0693e20584f62a6 /arch/x86/include/asm/perf_event.h | |
| parent | caa0142d84ceb0fc83e28f0475d0a7316cb6df77 (diff) | |
perf_events: Improve task_sched_in()
This patch is an optimization in perf_event_task_sched_in() to avoid
scheduling the events twice in a row.
Without it, the perf_disable()/perf_enable() pair is invoked twice,
thereby pinned events counts while scheduling flexible events and we go
throuh hw_perf_enable() twice.
By encapsulating, the whole sequence into perf_disable()/perf_enable() we
ensure, hw_perf_enable() is going to be invoked only once because of the
refcount protection.
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268288765-5326-1-git-send-email-eranian@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/perf_event.h')
0 files changed, 0 insertions, 0 deletions