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

From Christoph Lameter <cl@linux.com>
Newsgroups linux.kernel
Subject Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks
Date 2015-10-22 16:30 +0200
Message-ID <qmp2q-56v-29@gated-at.bofh.it> (permalink)
References (4 earlier) <qm5dn-1aW-9@gated-at.bofh.it> <qmmnT-18n-5@gated-at.bofh.it> <qmog3-3Ro-19@gated-at.bofh.it> <qmoSK-4U2-11@gated-at.bofh.it> <qmp2q-56v-25@gated-at.bofh.it>
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On Thu, 22 Oct 2015, Tejun Heo wrote:

> > Hmmm?  Just use a dedicated workqueue with WQ_MEM_RECLAIM.  If
> > concurrency management is a problem and there's something live-locking
> > for that work item (really?), WQ_CPU_INTENSIVE escapes it.  If this is
> > a common occurrence that it makes sense to give vmstat higher
> > priority, set WQ_HIGHPRI.
>
> Oooh, HIGHPRI + CPU_INTENSIVE immediate scheduling guarantee got lost
> while converting HIGHPRI to a separate pool but guaranteeing immediate
> scheduling for CPU_INTENSIVE is trivial.  If vmstat requires that,
> please let me know.

I guess we need that otherwise vm statistics are not updated while worker
threads are blocking on memory reclaim.

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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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