linux-kernel - [tip:perf/core] perf: Optimize __perf_event

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Date:	Sat, 21 Nov 2009 13:42:50 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, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perf/core] perf: Optimize __perf_event_read()

Commit-ID:  f6f83785222b0ee037f7be90731f62a649292b5e
Gitweb:     http://git.kernel.org/tip/f6f83785222b0ee037f7be90731f62a649292b5e
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 20 Nov 2009 22:19:51 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 21 Nov 2009 14:11:38 +0100

perf: Optimize __perf_event_read()

Both callers actually have IRQs disabled, no need doing so
again.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
LKML-Reference: <20091120212508.863685796@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/perf_event.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 65f4dab..e66f6c4 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1517,7 +1517,6 @@ static void __perf_event_read(void *info)
 	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
 	struct perf_event *event = info;
 	struct perf_event_context *ctx = event->ctx;
-	unsigned long flags;
 
 	/*
 	 * If this is a task context, we need to check whether it is
@@ -1529,12 +1528,10 @@ static void __perf_event_read(void *info)
 	if (ctx->task && cpuctx->task_ctx != ctx)
 		return;
 
-	local_irq_save(flags);
 	if (ctx->is_active)
 		update_context_time(ctx);
 	event->pmu->read(event);
 	update_event_times(event);
-	local_irq_restore(flags);
 }
 
 static u64 perf_event_read(struct perf_event *event)
--
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