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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-01-28 13:57:44 +0100
committerIngo Molnar <mingo@elte.hu>2010-02-04 09:59:49 +0100
commit9717e6cd3db22eade7dbae0fc9235c66325a7132 (patch)
tree7227e92b67e91d6b7b8270e397cdf9e1e245a789 /kernel/perf_event.c
parentf24bb999d2b9f2950e5cac5b69bffedf73c24ea4 (diff)
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/perf_event.c')
-rw-r--r--kernel/perf_event.c8
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,