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

Will Huck <will.huckk@xxxxxxxxx> · Wed, 01 May 2013 11:13:03 +0800

Hi Christoph,
On 04/29/2013 10:49 PM, Christoph Lameter wrote:
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.

Why need monitor the age of the object?

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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