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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 2015-10-22 17:20 +0200
Message-ID <qmpOO-6iz-29@gated-at.bofh.it> (permalink)
References (5 earlier) <qmp2q-56v-29@gated-at.bofh.it> <qmp2q-56v-27@gated-at.bofh.it> <qmp2r-56v-43@gated-at.bofh.it> <qmpc6-5kr-11@gated-at.bofh.it> <qmplM-5wh-23@gated-at.bofh.it>
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Hello,

On Thu, Oct 22, 2015 at 09:41:11AM -0500, Christoph Lameter wrote:
> > If this is actually a legit busy-waiting cyclic dependency, just let
> > me know.
> 
> There is no dependency of the vmstat updater on anything.
> They can run anytime. If there is a dependency then its created by the
> kworker subsystem itself.

Sure, the other direction is from workqueue concurrency detection.  I
was asking whether a work item can busy-wait on vmstat_update work
item cuz that's what confuses workqueue.  Looking at the original
dump, the pool has two idle workers indicating that the workqueue
wasn't short of execution resources and it really looks like that work
item was live-locking the pool.  I'll go ahead and add WQ_IMMEDIATE.

Thanks.

-- 
tejun
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[PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-21 14:30 +0200
  Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-21 15:10 +0200
  Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-21 16:30 +0200
    Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-21 16:40 +0200
      Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-21 16:50 +0200
        Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-21 17:00 +0200
          Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-21 17:40 +0200
          Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-21 19:20 +0200
            Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-22 13:40 +0200
              Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-22 15:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 16:20 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 16:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 16:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-22 16:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 16:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-22 16:50 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 17:20 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-23 06:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-22 16:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-22 16:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-22 17:10 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 17:20 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Christoph Lameter <cl@linux.com> - 2015-10-22 17:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-23 10:40 +0200
                Make vmstat deferrable again (was Re: [PATCH] mm,vmscan: Use accurate  values for zone_reclaimable() checks) Christoph Lameter <cl@linux.com> - 2015-10-23 13:50 +0200
                Re: Make vmstat deferrable again (was Re: [PATCH] mm,vmscan: Use  accurate values for zone_reclaimable() checks) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2015-10-23 14:10 +0200
                Re: Make vmstat deferrable again (was Re: [PATCH] mm,vmscan: Use  accurate values for zone_reclaimable() checks) Christoph Lameter <cl@linux.com> - 2015-10-23 16:20 +0200
                Re: Make vmstat deferrable again (was Re: [PATCH] mm,vmscan: Use  accurate values for zone_reclaimable() checks) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2015-10-23 17:00 +0200
                Re: Make vmstat deferrable again (was Re: [PATCH] mm,vmscan: Use  accurate values for zone_reclaimable() checks) Christoph Lameter <cl@linux.com> - 2015-10-23 18:20 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 17:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-22 17:50 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-22 20:50 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-22 23:50 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for  zone_reclaimable()checks Tejun Heo <htejun@gmail.com> - 2015-10-23 00:50 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for  zone_reclaimable()checks Michal Hocko <mhocko@kernel.org> - 2015-10-23 10:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for  zone_reclaimable()checks Tejun Heo <htejun@gmail.com> - 2015-10-23 12:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-23 10:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-23 12:40 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-23 13:20 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-23 14:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-23 20:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-25 12:00 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-25 23:50 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-27 10:30 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-27 12:00 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-27 13:10 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-23 20:30 +0200
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-27 10:20 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Tejun Heo <htejun@gmail.com> - 2015-10-27 12:00 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()checks Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-27 12:10 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for  zone_reclaimable()checks Tejun Heo <htejun@gmail.com> - 2015-10-27 12:40 +0100
                Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()  checks Michal Hocko <mhocko@kernel.org> - 2015-10-22 17:40 +0200

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