linux-kernel - Re: [PATCH 1/2] mm, oom: introduce oom reaper

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Message-Id: <20151218131400.751bc4d582a947c9833c09eb@linux-foundation.org>
Date:	Fri, 18 Dec 2015 13:14:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	David Rientjes <rientjes@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Argangeli <andrea@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper

On Fri, 18 Dec 2015 12:54:55 +0100 Michal Hocko <mhocko@...nel.org> wrote:

>  	/* Retry the down_read_trylock(mmap_sem) a few times */
> -	while (attempts++ < 10 && !__oom_reap_vmas(mm))
> -		msleep_interruptible(100);
> +	while (attempts++ < 10 && !__oom_reap_vmas(mm)) {
> +		__set_task_state(current, TASK_IDLE);
> +		schedule_timeout(HZ/10);
> +	}

If you won't, I shall ;)


From: Andrew Morton <akpm@...ux-foundation.org>
Subject: sched: add schedule_timeout_idle()

This will be needed in the patch "mm, oom: introduce oom reaper".

Cc: Michal Hocko <mhocko@...nel.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 include/linux/sched.h |    1 +
 kernel/time/timer.c   |   11 +++++++++++
 2 files changed, 12 insertions(+)

diff -puN kernel/time/timer.c~sched-add-schedule_timeout_idle kernel/time/timer.c
--- a/kernel/time/timer.c~sched-add-schedule_timeout_idle
+++ a/kernel/time/timer.c
@@ -1566,6 +1566,17 @@ signed long __sched schedule_timeout_uni
 }
 EXPORT_SYMBOL(schedule_timeout_uninterruptible);
 
+/*
+ * Like schedule_timeout_uninterruptible(), except this task will not contribute
+ * to load average.
+ */
+signed long __sched schedule_timeout_idle(signed long timeout)
+{
+	__set_current_state(TASK_IDLE);
+	return schedule_timeout(timeout);
+}
+EXPORT_SYMBOL(schedule_timeout_idle);
+
 #ifdef CONFIG_HOTPLUG_CPU
 static void migrate_timer_list(struct tvec_base *new_base, struct hlist_head *head)
 {
diff -puN include/linux/sched.h~sched-add-schedule_timeout_idle include/linux/sched.h
--- a/include/linux/sched.h~sched-add-schedule_timeout_idle
+++ a/include/linux/sched.h
@@ -423,6 +423,7 @@ extern signed long schedule_timeout(sign
 extern signed long schedule_timeout_interruptible(signed long timeout);
 extern signed long schedule_timeout_killable(signed long timeout);
 extern signed long schedule_timeout_uninterruptible(signed long timeout);
+extern signed long schedule_timeout_idle(signed long timeout);
 asmlinkage void schedule(void);
 extern void schedule_preempt_disabled(void);
 
_

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