linux-kernel - Re: [RFC PATCH] mm/oom_kill: allow oom kill allocating task for non-global case

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Message-ID: <353d012f-e8d4-c54c-b33e-54737e1a0115@redhat.com>
Date:   Mon, 7 Jun 2021 16:44:09 -0400
From:   Waiman Long <llong@...hat.com>
To:     Michal Hocko <mhocko@...e.com>, Waiman Long <llong@...hat.com>
Cc:     Shakeel Butt <shakeelb@...gle.com>,
        Aaron Tomlin <atomlin@...hat.com>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] mm/oom_kill: allow oom kill allocating task for
 non-global case

On 6/7/21 4:03 PM, Michal Hocko wrote:
> On Mon 07-06-21 21:36:47, Michal Hocko wrote:
>> On Mon 07-06-21 15:18:38, Waiman Long wrote:
> [...]
>>> A partial OOM report below:
>> Do you happen to have the full report?
>>
>>> [ 8221.433608] memory: usage 21280kB, limit 204800kB, failcnt 49116
>>>    :
>>> [ 8227.239769] [ pid ]   uid  tgid total_vm      rss pgtables_bytes swapents  oom_score_adj name
>>> [ 8227.242495] [1611298]     0 1611298    35869      635 167936        0         -1000 conmon
>>> [ 8227.242518] [1702509]     0 1702509    35869      701 176128        0         -1000 conmon
>>> [ 8227.242522] [1703345] 1001050000 1703294   183440        0 2125824        0           999 node
>>> [ 8227.242706] Out of memory and no killable processes...
>>> [ 8227.242731] node invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=999
> Btw it is surprising to not see _GFP_ACCOUNT here.

There are a number of OOM kills in the kernel log and none of the tasks 
that invoke oom-killer has _GFP_ACCOUNT flag set.

Regards,
Longman