From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754182AbZEXHCb (ORCPT ); Sun, 24 May 2009 03:02:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751660AbZEXHCH (ORCPT ); Sun, 24 May 2009 03:02:07 -0400 Received: from hera.kernel.org ([140.211.167.34]:35678 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751253AbZEXHCE (ORCPT ); Sun, 24 May 2009 03:02:04 -0400 Date: Sun, 24 May 2009 07:01:05 GMT From: tip-bot for Peter Zijlstra To: linux-tip-commits@vger.kernel.org Cc: linux-kernel@vger.kernel.org, acme@redhat.com, paulus@samba.org, hpa@zytor.com, mingo@redhat.com, jkacur@redhat.com, a.p.zijlstra@chello.nl, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org, acme@redhat.com, linux-kernel@vger.kernel.org, jkacur@redhat.com, a.p.zijlstra@chello.nl, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com, mingo@elte.hu In-Reply-To: <20090523163012.476197912@chello.nl> References: <20090523163012.476197912@chello.nl> Subject: [tip:perfcounters/core] perf_counter: Fix dynamic irq_period logging Message-ID: Git-Commit-ID: e220d2dcb944c5c488b6855d15ec66d76900514f X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Sun, 24 May 2009 07:01:08 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: e220d2dcb944c5c488b6855d15ec66d76900514f Gitweb: http://git.kernel.org/tip/e220d2dcb944c5c488b6855d15ec66d76900514f Author: Peter Zijlstra AuthorDate: Sat, 23 May 2009 18:28:55 +0200 Committer: Ingo Molnar CommitDate: Sat, 23 May 2009 19:37:44 +0200 perf_counter: Fix dynamic irq_period logging We call perf_adjust_freq() from perf_counter_task_tick() which is is called under the rq->lock causing lock recursion. However, it's no longer required to be called under the rq->lock, so remove it from under it. Also, fix up some related comments. Signed-off-by: Peter Zijlstra Cc: Paul Mackerras Cc: Corey Ashford Cc: Arnaldo Carvalho de Melo Cc: John Kacur LKML-Reference: <20090523163012.476197912@chello.nl> Signed-off-by: Ingo Molnar --- include/linux/perf_counter.h | 1 + kernel/perf_counter.c | 3 ++- kernel/sched.c | 3 ++- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 2eedae8..23ddd29 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -260,6 +260,7 @@ enum perf_event_type { /* * struct { * struct perf_event_header header; + * u64 time; * u64 irq_period; * }; */ diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index c100554..2f410ea 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -2559,7 +2559,8 @@ void perf_counter_munmap(unsigned long addr, unsigned long len, } /* - * + * Log irq_period changes so that analyzing tools can re-normalize the + * event flow. */ static void perf_log_period(struct perf_counter *counter, u64 period) diff --git a/kernel/sched.c b/kernel/sched.c index 4c0d58b..ad079f0 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4875,9 +4875,10 @@ void scheduler_tick(void) update_rq_clock(rq); update_cpu_load(rq); curr->sched_class->task_tick(rq, curr, 0); - perf_counter_task_tick(curr, cpu); spin_unlock(&rq->lock); + perf_counter_task_tick(curr, cpu); + #ifdef CONFIG_SMP rq->idle_at_tick = idle_cpu(cpu); trigger_load_balance(rq, cpu);