Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup

From	Tim Murray <timmurray@google.com>
Newsgroups	linux.kernel
Subject	Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup
Date	2017-03-31 00:00 +0200
Message-ID	<tqQgO-46k-3@gated-at.bofh.it> (permalink)
References	<tm9tL-5Ls-3@gated-at.bofh.it> <tqKEp-8v3-3@gated-at.bofh.it> <tqOf1-2K2-29@gated-at.bofh.it>
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On Thu, Mar 30, 2017 at 12:40 PM, Tim Murray <timmurray@google.com> wrote:
> The current critical vmpressure event
> hasn't been that successful in avoiding oom-killer (on 3.18, at
> least)--I've been able to get oom-killer to trigger without a
> vmpressure event.

Looked at this some more, and this is almost certainly because
vmpressure relies on workqueues. Scheduling delay from CFS workqueues
would explain vmpressure latency that results in oom-killer running
long before the critical vmpressure notification is received in
userspace, even if userspace is running as FIFO. We regularly see
10ms+ latency on workqueues, even when an Android device isn't heavily
loaded.

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Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup Johannes Weiner <hannes@cmpxchg.org> - 2017-03-30 18:00 +0200
  Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup Shakeel Butt <shakeelb@google.com> - 2017-03-30 18:50 +0200
  Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup Tim Murray <timmurray@google.com> - 2017-03-30 21:50 +0200
    Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup Tim Murray <timmurray@google.com> - 2017-03-31 00:00 +0200

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