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

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Date:	Tue, 27 Oct 2015 09:09:21 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Aristeu Rozanski <arozansk@...hat.com>
Cc:	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 Mon 26-10-15 13:40:49, Aristeu Rozanski wrote:
> Hi Michal,
> On Mon, Oct 26, 2015 at 06:20:12PM +0100, Michal Hocko wrote:
[...]
> > Would it make more sense to distinguish different parts of the OOM
> > report by loglevel properly?
> > pr_err - killed task report
> > pr_warning - oom invocation + memory info
> > pr_notice - task list
> > pr_info - stack trace
> 
> That'd work, yes, but I'd think the stack trace would be pr_debug. At a
> point that you suspect the OOM killer isn't doing the right thing picking
> up tasks and you need more information.

Stack trace should be independent on the oom victim selection because
the selection should be as much deterministic as possible - so it should
only depend on the memory consumption. I do agree that the exact trace
is not very useful for the (maybe) majority of OOM reports. I am trying
to remember when it was really useful the last time and have trouble to
find an example. So I would tend to agree that pr_debug would me more
suitable.
-- 
Michal Hocko
SUSE Labs
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