linux-kernel - Re: [RFC][PATCH] oom: Be less verbose if the oom

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Date:	Fri, 6 Jun 2014 11:10:42 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Richard Weinberger <richard@....at>, hannes@...xchg.org,
	bsingharora@...il.com, kamezawa.hiroyu@...fujitsu.com,
	akpm@...ux-foundation.org, vdavydov@...allels.com, tj@...nel.org,
	handai.szj@...bao.com, oleg@...hat.com, rusty@...tcorp.com.au,
	kirill.shutemov@...ux.intel.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH] oom: Be less verbose if the oom_control event fd
 has listeners

On Thu 05-06-14 14:01:02, David Rientjes wrote:
> On Thu, 5 Jun 2014, Michal Hocko wrote:
> 
> > If we are printing too much then OK, let's remove those parts which are
> > not that useful but hiding information which tells us more about the oom
> > decision doesn't sound right to me.
> > 
> 
> Memcg oom killer printing is controlled mostly by 
> mem_cgroup_print_oom_info(), I don't see anything in the generic oom 
> killer that should be removed and that I have not used even for memcg ooms 
> in the past.

Yes, I find most of the information printed during OOM very helpful.
After 58cf188ed649 (memcg, oom: provide more precise dump info while
memcg oom happening) even memcg oom info is helpful.

> Perhaps there could be a case made for suppressing some of the 
> hierarchical stats from being printed for memcg ooms and controlled by 
> another memcg knob, but it doesn't sound vital.

Agreed.

-- 
Michal Hocko
SUSE Labs
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