From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758134AbYBJHVE (ORCPT ); Sun, 10 Feb 2008 02:21:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756961AbYBJHUP (ORCPT ); Sun, 10 Feb 2008 02:20:15 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:35381 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756815AbYBJHUN (ORCPT ); Sun, 10 Feb 2008 02:20:13 -0500 Date: Sun, 10 Feb 2008 08:20:00 +0100 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Linus Torvalds , Andrew Morton , Steven Rostedt Subject: [02/19] sched: add latency tracer callbacks to the scheduler Message-ID: <20080210071959.GC4100@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ingo Molnar add 3 lightweight callbacks to the tracer backend. zero impact if tracing is turned off. Signed-off-by: Ingo Molnar --- include/linux/sched.h | 26 ++++++++++++++++++++++++++ kernel/sched.c | 3 +++ 2 files changed, 29 insertions(+) Index: linux/include/linux/sched.h =================================================================== --- linux.orig/include/linux/sched.h +++ linux/include/linux/sched.h @@ -2027,6 +2027,32 @@ extern int sched_mc_power_savings, sched extern void normalize_rt_tasks(void); +#ifdef CONFIG_CONTEXT_SWITCH_TRACER +extern void +ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next); +#else +static inline void +ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next) +{ +} +#endif + +#ifdef CONFIG_SCHED_TRACER +extern void +ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr); +extern void +ftrace_wake_up_new_task(struct task_struct *wakee, struct task_struct *curr); +#else +static inline void +ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr) +{ +} +static inline void +ftrace_wake_up_new_task(struct task_struct *wakee, struct task_struct *curr) +{ +} +#endif + #ifdef CONFIG_FAIR_GROUP_SCHED extern struct task_group init_task_group; Index: linux/kernel/sched.c =================================================================== --- linux.orig/kernel/sched.c +++ linux/kernel/sched.c @@ -1867,6 +1867,7 @@ static int try_to_wake_up(struct task_st out_activate: #endif /* CONFIG_SMP */ + ftrace_wake_up_task(p, rq->curr); schedstat_inc(p, se.nr_wakeups); if (sync) schedstat_inc(p, se.nr_wakeups_sync); @@ -2007,6 +2008,7 @@ void wake_up_new_task(struct task_struct p->sched_class->task_new(rq, p); inc_nr_running(rq); } + ftrace_wake_up_new_task(p, rq->curr); check_preempt_curr(rq, p); #ifdef CONFIG_SMP if (p->sched_class->task_wake_up) @@ -2179,6 +2181,7 @@ context_switch(struct rq *rq, struct tas struct mm_struct *mm, *oldmm; prepare_task_switch(rq, prev, next); + ftrace_ctx_switch(prev, next); mm = next->mm; oldmm = prev->active_mm; /*