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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-01-28 13:57:44 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-04 09:59:49 +0100 |
| commit | 9717e6cd3db22eade7dbae0fc9235c66325a7132 (patch) | |
| tree | 7227e92b67e91d6b7b8270e397cdf9e1e245a789 /kernel | |
| parent | f24bb999d2b9f2950e5cac5b69bffedf73c24ea4 (diff) | |
| download | linux-9717e6cd3db22eade7dbae0fc9235c66325a7132.tar.bz2 | |
perf_events: Optimize perf_event_task_tick()
Pretty much all of the calls do perf_disable/perf_enable cycles, pull
that out to cut back on hardware programming.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/perf_event.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 40f8b07c5601..087025fe3ba1 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -1573,12 +1573,8 @@ static void rotate_ctx(struct perf_event_context *ctx) raw_spin_lock(&ctx->lock); /* Rotate the first entry last of non-pinned groups */ - perf_disable(); - list_rotate_left(&ctx->flexible_groups); - perf_enable(); - raw_spin_unlock(&ctx->lock); } @@ -1593,6 +1589,8 @@ void perf_event_task_tick(struct task_struct *curr) cpuctx = &__get_cpu_var(perf_cpu_context); ctx = curr->perf_event_ctxp; + perf_disable(); + perf_ctx_adjust_freq(&cpuctx->ctx); if (ctx) perf_ctx_adjust_freq(ctx); @@ -1608,6 +1606,8 @@ void perf_event_task_tick(struct task_struct *curr) cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE); if (ctx) task_ctx_sched_in(curr, EVENT_FLEXIBLE); + + perf_enable(); } static int event_enable_on_exec(struct perf_event *event, |