linux-kernel - [tip:perfcounters/core] perf_counter: round-robin per-CPU counters too

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Message-ID: <tip-b82914ce33146186d554b0f5c41e4e13693614ce@git.kernel.org>
Date:	Mon, 4 May 2009 17:33:32 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: round-robin per-CPU counters too

Commit-ID:  b82914ce33146186d554b0f5c41e4e13693614ce
Gitweb:     http://git.kernel.org/tip/b82914ce33146186d554b0f5c41e4e13693614ce
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Mon, 4 May 2009 18:54:32 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 4 May 2009 19:29:57 +0200

perf_counter: round-robin per-CPU counters too

This used to be unstable when we had the rq->lock dependencies,
but now that they are that of the past we can turn on percpu
counter RR too.

[ Impact: handle counter over-commit for per-CPU counters too ]

LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/perf_counter.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 8660ae5..b9679c3 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1069,18 +1069,14 @@ void perf_counter_task_tick(struct task_struct *curr, int cpu)
 {
 	struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
 	struct perf_counter_context *ctx = &curr->perf_counter_ctx;
-	const int rotate_percpu = 0;
 
-	if (rotate_percpu)
-		perf_counter_cpu_sched_out(cpuctx);
+	perf_counter_cpu_sched_out(cpuctx);
 	perf_counter_task_sched_out(curr, cpu);
 
-	if (rotate_percpu)
-		rotate_ctx(&cpuctx->ctx);
+	rotate_ctx(&cpuctx->ctx);
 	rotate_ctx(ctx);
 
-	if (rotate_percpu)
-		perf_counter_cpu_sched_in(cpuctx, cpu);
+	perf_counter_cpu_sched_in(cpuctx, cpu);
 	perf_counter_task_sched_in(curr, cpu);
 }
 
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