linux-kernel - Re: OOM-killer and strange RSS value in 3.9-rc7

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Date:	Mon, 29 Apr 2013 14:49:27 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Will Huck <will.huckk@...il.com>
cc:	Han Pingtian <hanpt@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, mhocko@...e.cz,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org
Subject: Re: OOM-killer and strange RSS value in 3.9-rc7

On Sat, 27 Apr 2013, Will Huck wrote:

> Hi Christoph,
> On 04/26/2013 01:17 AM, Christoph Lameter wrote:
> > On Thu, 25 Apr 2013, Han Pingtian wrote:
> >
> > > I have enabled "slub_debug" and here is the
> > > /sys/kernel/slab/kmalloc-512/alloc_calls contents:
> > >
> > >       50 .__alloc_workqueue_key+0x90/0x5d0 age=113630/116957/119419
> > > pid=1-1730 cpus=0,6-8,13,24,26,44,53,57,60,68 nodes=1
> > >       11 .__alloc_workqueue_key+0x16c/0x5d0 age=113814/116733/119419
> > > pid=1-1730 cpus=0,44,68 nodes=1
> > >       13 .add_sysfs_param.isra.2+0x80/0x210 age=115175/117994/118779
> > > pid=1-1342 cpus=0,8,12,24,60 nodes=1
> > >      160 .build_sched_domains+0x108/0xe30 age=119111/119120/119131 pid=1
> > > cpus=0 nodes=1
> > >     9000 .alloc_fair_sched_group+0xe4/0x220 age=110549/114471/117357
> > > pid=1-2290
> > > cpus=0-1,5,9-11,13,24,29,33,36,38,40-41,45,48-50,53,56-58,60-63,68-69,72-73,76-77,79
> > > nodes=1
> > >     9000 .alloc_fair_sched_group+0x114/0x220 age=110549/114471/117357
> > > pid=1-2290
> > > cpus=0-1,5,9-11,13,24,29,33,36,38,40-41,45,48-50,53,56-58,60-63,68-69,72-73,76-77,79
> > > nodes=1
>
> Could you explain the meaning of  age=xx/xx/xx  pid=xx-xx cpus=xx here?
>

Age refers to the mininum / avg / maximum age of the object in ticks.

pid refers to the range of pids by processes running when the objects were
created.

cpus are the processors on which kernel threads where running when these
objects were allocated.

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