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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-04-09 21:17:40 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-05-28 18:01:09 +0200 |
| commit | 075e0b00857e166dcc3e39037a1fc5a90acac709 (patch) | |
| tree | 448cc154bde8d50cb43578416467cfe94d8267c5 /kernel/events | |
| parent | f506b3dc0ec454a16d40cab9ee5d75435b39dc50 (diff) | |
| download | linux-075e0b00857e166dcc3e39037a1fc5a90acac709.tar.bz2 | |
perf: Optimize ctx_sched_out()
Oleg noted that ctx_sched_out() disables the PMU even though it might
not actually do something, avoid needless PMU-disabling.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110409192141.665385503@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index d863b3c057bb..4d9a1f014286 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1760,7 +1760,6 @@ static void ctx_sched_out(struct perf_event_context *ctx, struct perf_event *event; raw_spin_lock(&ctx->lock); - perf_pmu_disable(ctx->pmu); ctx->is_active = 0; if (likely(!ctx->nr_events)) goto out; @@ -1770,6 +1769,7 @@ static void ctx_sched_out(struct perf_event_context *ctx, if (!ctx->nr_active) goto out; + perf_pmu_disable(ctx->pmu); if (event_type & EVENT_PINNED) { list_for_each_entry(event, &ctx->pinned_groups, group_entry) group_sched_out(event, cpuctx, ctx); @@ -1779,8 +1779,8 @@ static void ctx_sched_out(struct perf_event_context *ctx, list_for_each_entry(event, &ctx->flexible_groups, group_entry) group_sched_out(event, cpuctx, ctx); } -out: perf_pmu_enable(ctx->pmu); +out: raw_spin_unlock(&ctx->lock); } |