Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751443AbbLUIiS (ORCPT ); Mon, 21 Dec 2015 03:38:18 -0500 Received: from mail-wm0-f52.google.com ([74.125.82.52]:38199 "EHLO mail-wm0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750964AbbLUIiR (ORCPT ); Mon, 21 Dec 2015 03:38:17 -0500 Date: Mon, 21 Dec 2015 09:38:14 +0100 From: Michal Hocko To: Andrew Morton Cc: Linus Torvalds , Mel Gorman , Tetsuo Handa , David Rientjes , Oleg Nesterov , Hugh Dickins , Andrea Argangeli , Rik van Riel , linux-mm , LKML Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper Message-ID: <20151221083812.GB11089@dhcp22.suse.cz> References: <1450204575-13052-1-git-send-email-mhocko@kernel.org> <20151216165035.38a4d9b84600d6348a3cf4bf@linux-foundation.org> <20151217130223.GE18625@dhcp22.suse.cz> <20151217120004.b5f849e1613a3a367482b379@linux-foundation.org> <20151218115454.GE28443@dhcp22.suse.cz> <20151218131400.751bc4d582a947c9833c09eb@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151218131400.751bc4d582a947c9833c09eb@linux-foundation.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2634 Lines: 76 On Fri 18-12-15 13:14:00, Andrew Morton wrote: > On Fri, 18 Dec 2015 12:54:55 +0100 Michal Hocko 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 > Subject: sched: add schedule_timeout_idle() > > This will be needed in the patch "mm, oom: introduce oom reaper". > > Cc: Michal Hocko > Cc: Ingo Molnar > Cc: Peter Zijlstra > Signed-off-by: Andrew Morton Thanks! This makes more sense. Acked-by: Michal Hocko > --- > > 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); > > _ -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/