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From: Ami Fischman <fischman@google.com>
To: Robert Kolchmeyer <rkolchmeyer@google.com>
Cc: David Rientjes <rientjes@google.com>,
	Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch] mm, oom: make a last minute check to prevent unnecessary memcg oom kills
Date: Tue, 17 Mar 2020 12:00:45 -0700	[thread overview]
Message-ID: <CAHuR8a-PbmthrKYpY5-SM-MH39O39W2J1mXA48oy9nASmys0mg@mail.gmail.com> (raw)
In-Reply-To: <CAJc0_fwDAKUTcYd_rga+jjDEE2BT7Tp=ViWdtiUeswVLUqC9CQ@mail.gmail.com>

On Tue, Mar 17, 2020 at 11:26 AM Robert Kolchmeyer
<rkolchmeyer@google.com> wrote:
>
> On Tue, Mar 10, 2020 at 3:54 PM David Rientjes <rientjes@google.com> wrote:
> >
> > Robert, could you elaborate on the user-visible effects of this issue that
> > caused it to initially get reported?
>
> Ami (now cc'ed) knows more, but here is my understanding.

Robert's description of the mechanics we observed is accurate.

We discovered this regression in the oom-killer's behavior when
attempting to upgrade our system. The fraction of the system that
went unhealthy due to this issue was approximately equal to the
_sum_ of all other causes of unhealth, which are many and varied,
but each of which contribute only a small amount of
unhealth. This issue forced a rollback to the previous kernel
where we ~never see this behavior, returning our unhealth levels
to the previous background levels.

Cheers,
-a

  reply	other threads:[~2020-03-17 19:01 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-10 21:55 David Rientjes
2020-03-10 22:19 ` Michal Hocko
2020-03-10 22:54   ` David Rientjes
2020-03-11  8:39     ` Michal Hocko
2020-03-17  7:59       ` Michal Hocko
2020-03-11 11:41     ` Tetsuo Handa
2020-03-11 19:51       ` David Rientjes
2020-03-17 18:25     ` Robert Kolchmeyer
2020-03-17 19:00       ` Ami Fischman [this message]
2020-03-18  9:57         ` Michal Hocko
2020-03-18 15:20           ` Ami Fischman
2020-03-18  9:55       ` Michal Hocko

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