Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks

From	Tejun Heo <htejun@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks
Date	2015-11-02 20:30 +0100
Message-ID	<qqsXM-No-7@gated-at.bofh.it> (permalink)
References	(5 earlier) <qmpc6-5kr-11@gated-at.bofh.it> <qmplM-5wh-23@gated-at.bofh.it> <qmpOO-6iz-29@gated-at.bofh.it> <qmC9j-7jL-1@gated-at.bofh.it> <qqoUa-6R3-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Nov 02, 2015 at 04:01:37PM +0100, Michal Hocko wrote:
...
> which is perfectly suited for the stable backport, OOM sysrq resp. any
> sysrq which runs from the WQ context should be as robust as possible and
> shouldn't rely on all the code running from WQ context to issue a sleep
> to get unstuck. So I definitely support something like this patch.

Well, sysrq wouldn't run successfully either on a cpu which is busy
looping with preemption off.  I don't think this calls for a new flag
to modify workqueue behavior especially given that missing such flag
would lead to the same kind of lockup.  It's a shitty solution.  If
the possibility of sysrq getting stuck behind concurrency management
is an issue, queueing them on an unbound or highpri workqueue should
be good enough.

Thanks.

-- 
tejun
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Thread

Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-11-02 16:10 +0100
  Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-11-02 20:30 +0100
    Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-11-03 03:40 +0100
      Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-11-03 20:50 +0100
  Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-11-05 16:10 +0100
    Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-11-05 18:50 +0100
      Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-11-06 01:20 +0100
        Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-11-11 16:50 +0100
          Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-11-11 17:10 +0100

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