[tip:perf/core] perf_event: x86: Optimize x86_pmu_disable()

tip-bot for Peter Zijlstra
2010-01-29T09:31:36Z

Commit-ID: 6c9687abeb24d5b7aae7db5be070c2139ad29e29
Gitweb: http://git.kernel.org/tip/6c9687abeb24d5b7aae7db5be070c2139ad29e29
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Mon, 25 Jan 2010 11:57:25 +0100
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 29 Jan 2010 09:01:43 +0100

perf_event: x86: Optimize x86_pmu_disable()

x86_pmu_disable() removes the event from the cpuc->event_list[], however
since an event can only be on that list once, stop looking after we found
it.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/cpu/perf_event.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 33c889f..66de282 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1884,6 +1884,7 @@ static void x86_pmu_disable(struct perf_event *event)
cpuc->event_list[i-1] = cpuc->event_list[i];

--cpuc->n_events;
+ break;
}
}
perf_event_update_userpage(event);