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

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Date:	Mon, 14 Oct 2013 12:43:33 +0200
From:	Juri Lelli <juri.lelli@...il.com>
To:	peterz@...radead.org, tglx@...utronix.de
Cc:	mingo@...hat.com, rostedt@...dmis.org, 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,
	juri.lelli@...il.com, 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--no-chain-reply-to
Subject: [PATCH 01/14] sched: add sched_class->task_dead.

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.

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);
-- 
1.7.9.5

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