linux-kernel - [tip:perf/core] perf_event: x86: Optimize x86_pmu

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Message-ID: <tip-6c9687abeb24d5b7aae7db5be070c2139ad29e29@git.kernel.org>
Date:	Fri, 29 Jan 2010 09:29:06 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perf/core] perf_event: x86: Optimize x86_pmu_disable()

Commit-ID:  6c9687abeb24d5b7aae7db5be070c2139ad29e29
Gitweb:     http://git.kernel.org/tip/6c9687abeb24d5b7aae7db5be070c2139ad29e29
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Mon, 25 Jan 2010 11:57:25 +0100
Committer:  Ingo Molnar <mingo@...e.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@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.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);
--
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