linux-kernel - Re: [PATCH] oom_kill: add option to disable dump

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Message-ID: <20151202081842.GA25284@dhcp22.suse.cz>
Date:	Wed, 2 Dec 2015 09:18:43 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Aristeu Rozanski <arozansk@...hat.com>,
	linux-kernel@...r.kernel.org, Greg Thelen <gthelen@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH] oom_kill: add option to disable dump_stack()

On Tue 01-12-15 15:43:53, Andrew Morton wrote:
[...]
> > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > index 1ecc0bc..bdbf83b 100644
> > --- a/mm/oom_kill.c
> > +++ b/mm/oom_kill.c
> > @@ -42,6 +42,7 @@
> >  int sysctl_panic_on_oom;
> >  int sysctl_oom_kill_allocating_task;
> >  int sysctl_oom_dump_tasks = 1;
> > +int sysctl_oom_dump_stack = 1;
> >  
> >  DEFINE_MUTEX(oom_lock);
> >  
> > @@ -384,7 +385,8 @@ static void dump_header(struct oom_control *oc, struct task_struct *p,
> >  		current->signal->oom_score_adj);
> >  	cpuset_print_task_mems_allowed(current);
> >  	task_unlock(current);
> > -	dump_stack();
> > +	if (sysctl_oom_dump_stack)
> > +		dump_stack();
> >  	if (memcg)
> >  		mem_cgroup_print_oom_info(memcg, p);
> >  	else
> 
> The patch seems reasonable to me, but it's missing the required update
> to Documentation/sysctl/vm.txt.

I thought we have agreed to go via KERN_DEBUG log level for the
backtrace. Aristeu has posted a patch for that already.
-- 
Michal Hocko
SUSE Labs
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