linux-kernel - [PATCH 06/43] sched: add wakeup/sleep sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1267187000-18791-7-git-send-email-tj@kernel.org>
Date:	Fri, 26 Feb 2010 21:22:43 +0900
From:	Tejun Heo <tj@...nel.org>
To:	torvalds@...ux-foundation.org, mingo@...e.hu, peterz@...radead.org,
	awalls@...ix.net, linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com, avi@...hat.com,
	johannes@...solutions.net, andi@...stfloor.org, oleg@...hat.com
Cc:	Tejun Heo <tj@...nel.org>, Mike Galbraith <efault@....de>
Subject: [PATCH 06/43] sched: add wakeup/sleep sched_notifiers and allow NULL notifier ops

Add wakeup and sleep notifiers to sched_notifiers and allow omitting
some of the notifiers in the ops table.  These will be used by
concurrency managed workqueue.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Mike Galbraith <efault@....de>
Cc: Ingo Molnar <mingo@...e.hu>
---
 include/linux/sched.h |    6 ++++++
 kernel/sched.c        |   11 ++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4a1e368..401d746 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1231,6 +1231,10 @@ struct sched_notifier;
 
 /**
  * sched_notifier_ops - notifiers called for scheduling events
+ * @wakeup: we're waking up
+ *    notifier: struct sched_notifier for the task being woken up
+ * @sleep: we're going to bed
+ *    notifier: struct sched_notifier for the task sleeping
  * @in: we're about to be rescheduled:
  *    notifier: struct sched_notifier for the task being scheduled
  *    cpu:  cpu we're scheduled on
@@ -1244,6 +1248,8 @@ struct sched_notifier;
  * and depended upon by its users.
  */
 struct sched_notifier_ops {
+	void (*wakeup)(struct sched_notifier *notifier);
+	void (*sleep)(struct sched_notifier *notifier);
 	void (*in)(struct sched_notifier *notifier, int cpu);
 	void (*out)(struct sched_notifier *notifier, struct task_struct *next);
 };
diff --git a/kernel/sched.c b/kernel/sched.c
index 8c2dfb3..c371b8f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1439,7 +1439,8 @@ static inline void cpuacct_update_stats(struct task_struct *tsk,
 	struct hlist_node *__pos;					\
 									\
 	hlist_for_each_entry(__sn, __pos, &(p)->sched_notifiers, link)	\
-		__sn->ops->callback(__sn , ##args);			\
+		if (__sn->ops->callback)				\
+			__sn->ops->callback(__sn , ##args);		\
 } while (0)
 
 /**
@@ -2437,6 +2438,8 @@ static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq,
 		rq->idle_stamp = 0;
 	}
 #endif
+	if (success)
+		fire_sched_notifiers(p, wakeup);
 }
 
 /**
@@ -5492,10 +5495,12 @@ need_resched_nonpreemptible:
 	clear_tsk_need_resched(prev);
 
 	if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
-		if (unlikely(signal_pending_state(prev->state, prev)))
+		if (unlikely(signal_pending_state(prev->state, prev))) {
 			prev->state = TASK_RUNNING;
-		else
+		} else {
+			fire_sched_notifiers(prev, sleep);
 			deactivate_task(rq, prev, 1);
+		}
 		switch_count = &prev->nvcsw;
 	}
 
-- 
1.6.4.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/