linux-kernel - Re: [PATCH 01/14] sched: add sched_class->task

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Message-ID: <20131112121900.6dcfcb0a@gandalf.local.home>
Date:	Tue, 12 Nov 2013 12:19:00 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Juri Lelli <juri.lelli@...il.com>
Cc:	peterz@...radead.org, tglx@...utronix.de, mingo@...hat.com,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com
Subject: Re: [PATCH 01/14] sched: add sched_class->task_dead.

On Thu,  7 Nov 2013 14:43:35 +0100
Juri Lelli <juri.lelli@...il.com> wrote:

> From: Dario Faggioli <raistlin@...ux.it>
> 
> Add a new function to the scheduling class interface. It is called
> at the end of a context switch, if the prev task is in TASK_DEAD state.
> 
> It might be useful for the scheduling classes that want to be notified
> when one of their task dies, e.g. to perform some cleanup actions.

Nit.  s/task/tasks/

-- Steve

> 
> Signed-off-by: Dario Faggioli <raistlin@...ux.it>
> Signed-off-by: Juri Lelli <juri.lelli@...il.com>
> ---
>  kernel/sched/core.c  |    3 +++
>  kernel/sched/sched.h |    1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 5ac63c9..850a02c 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1890,6 +1890,9 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
>  	if (mm)
>  		mmdrop(mm);
>  	if (unlikely(prev_state == TASK_DEAD)) {
> +		if (prev->sched_class->task_dead)
> +			prev->sched_class->task_dead(prev);
> +
>  		/*
>  		 * Remove function-return probe instances associated with this
>  		 * task and put them back on the free list.
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index b3c5653..64eda5c 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -992,6 +992,7 @@ struct sched_class {
>  	void (*set_curr_task) (struct rq *rq);
>  	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
>  	void (*task_fork) (struct task_struct *p);
> +	void (*task_dead) (struct task_struct *p);
>  
>  	void (*switched_from) (struct rq *this_rq, struct task_struct *task);
>  	void (*switched_to) (struct rq *this_rq, struct task_struct *task);

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