From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757842Ab1DNIeI (ORCPT ); Thu, 14 Apr 2011 04:34:08 -0400 Received: from hera.kernel.org ([140.211.167.34]:47167 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756490Ab1DNIeD (ORCPT ); Thu, 14 Apr 2011 04:34:03 -0400 Date: Thu, 14 Apr 2011 08:32:52 GMT From: tip-bot for Peter Zijlstra Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, torvalds@linux-foundation.org, a.p.zijlstra@chello.nl, efault@gmx.de, npiggin@kernel.dk, akpm@linux-foundation.org, tglx@linutronix.de, frank.rowand@am.sony.com, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, a.p.zijlstra@chello.nl, torvalds@linux-foundation.org, efault@gmx.de, npiggin@kernel.dk, akpm@linux-foundation.org, frank.rowand@am.sony.com, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <20110405152728.866866929@chello.nl> References: <20110405152728.866866929@chello.nl> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/locking] sched: Change the ttwu() success details Git-Commit-ID: 893633817f5b58f5227365d74344e0170a718213 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Thu, 14 Apr 2011 08:32:52 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 893633817f5b58f5227365d74344e0170a718213 Gitweb: http://git.kernel.org/tip/893633817f5b58f5227365d74344e0170a718213 Author: Peter Zijlstra AuthorDate: Tue, 5 Apr 2011 17:23:42 +0200 Committer: Ingo Molnar CommitDate: Thu, 14 Apr 2011 08:52:34 +0200 sched: Change the ttwu() success details try_to_wake_up() would only return a success when it would have to place a task on a rq, change that to every time we change p->state to TASK_RUNNING, because that's the real measure of wakeups. This results in that success is always true for the tracepoints. Reviewed-by: Frank Rowand Cc: Mike Galbraith Cc: Nick Piggin Cc: Linus Torvalds Cc: Andrew Morton Signed-off-by: Ingo Molnar Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20110405152728.866866929@chello.nl --- kernel/sched.c | 16 +++++++--------- 1 files changed, 7 insertions(+), 9 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 81ab58e..3919aa4 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2427,10 +2427,10 @@ static inline void ttwu_activate(struct task_struct *p, struct rq *rq, wq_worker_waking_up(p, cpu_of(rq)); } -static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq, - int wake_flags, bool success) +static void +ttwu_post_activation(struct task_struct *p, struct rq *rq, int wake_flags) { - trace_sched_wakeup(p, success); + trace_sched_wakeup(p, true); check_preempt_curr(rq, p, wake_flags); p->state = TASK_RUNNING; @@ -2546,9 +2546,9 @@ out_activate: #endif /* CONFIG_SMP */ ttwu_activate(p, rq, wake_flags & WF_SYNC, orig_cpu != cpu, cpu == this_cpu, en_flags); - success = 1; out_running: - ttwu_post_activation(p, rq, wake_flags, success); + ttwu_post_activation(p, rq, wake_flags); + success = 1; out: task_rq_unlock(rq, &flags); put_cpu(); @@ -2567,7 +2567,6 @@ out: static void try_to_wake_up_local(struct task_struct *p) { struct rq *rq = task_rq(p); - bool success = false; BUG_ON(rq != this_rq()); BUG_ON(p == current); @@ -2582,9 +2581,8 @@ static void try_to_wake_up_local(struct task_struct *p) schedstat_inc(rq, ttwu_local); } ttwu_activate(p, rq, false, false, true, ENQUEUE_WAKEUP); - success = true; } - ttwu_post_activation(p, rq, 0, success); + ttwu_post_activation(p, rq, 0); } /** @@ -2747,7 +2745,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags) rq = task_rq_lock(p, &flags); activate_task(rq, p, 0); - trace_sched_wakeup_new(p, 1); + trace_sched_wakeup_new(p, true); check_preempt_curr(rq, p, WF_FORK); #ifdef CONFIG_SMP if (p->sched_class->task_woken)