linux-kernel - [tip:perf/core] perf: Allow the PMU driver to choose the CPU on which to install events

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Message-ID: <tip-e2d37cd213dcc0aeb3db4b37b9bd1710fe36fbf7@git.kernel.org>
Date:	Wed, 20 Jun 2012 03:51:45 -0700
From:	"tip-bot for Yan, Zheng" <zheng.z.yan@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, zheng.z.yan@...el.com, tglx@...utronix.de
Subject: [tip:perf/core] perf:
  Allow the PMU driver to choose the CPU on which to install events

Commit-ID:  e2d37cd213dcc0aeb3db4b37b9bd1710fe36fbf7
Gitweb:     http://git.kernel.org/tip/e2d37cd213dcc0aeb3db4b37b9bd1710fe36fbf7
Author:     Yan, Zheng <zheng.z.yan@...el.com>
AuthorDate: Fri, 15 Jun 2012 14:31:32 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 18 Jun 2012 12:13:21 +0200

perf: Allow the PMU driver to choose the CPU on which to install events

Allow the pmu->event_init callback to change event->cpu, so the PMU driver
can choose the CPU on which to install events.

Signed-off-by: Zheng Yan <zheng.z.yan@...el.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1339741902-8449-4-git-send-email-zheng.z.yan@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 31d182e..fa36a39 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6306,7 +6306,7 @@ SYSCALL_DEFINE5(perf_event_open,
 	/*
 	 * Get the target context (task or percpu):
 	 */
-	ctx = find_get_context(pmu, task, cpu);
+	ctx = find_get_context(pmu, task, event->cpu);
 	if (IS_ERR(ctx)) {
 		err = PTR_ERR(ctx);
 		goto err_alloc;
@@ -6379,16 +6379,16 @@ SYSCALL_DEFINE5(perf_event_open,
 	mutex_lock(&ctx->mutex);
 
 	if (move_group) {
-		perf_install_in_context(ctx, group_leader, cpu);
+		perf_install_in_context(ctx, group_leader, event->cpu);
 		get_ctx(ctx);
 		list_for_each_entry(sibling, &group_leader->sibling_list,
 				    group_entry) {
-			perf_install_in_context(ctx, sibling, cpu);
+			perf_install_in_context(ctx, sibling, event->cpu);
 			get_ctx(ctx);
 		}
 	}
 
-	perf_install_in_context(ctx, event, cpu);
+	perf_install_in_context(ctx, event, event->cpu);
 	++ctx->generation;
 	perf_unpin_context(ctx);
 	mutex_unlock(&ctx->mutex);
--
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