Re: [patch 3/3] vmstat: Create our own workqueue

From	Tejun Heo <htejun@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [patch 3/3] vmstat: Create our own workqueue
Date	2015-10-29 04:10 +0100
Message-ID	<qoLLb-34N-3@gated-at.bofh.it> (permalink)
References	(1 earlier) <qooYh-54u-7@gated-at.bofh.it> <qooYh-54u-5@gated-at.bofh.it> <qophE-5qX-13@gated-at.bofh.it> <qoxyy-28r-13@gated-at.bofh.it> <qoL8u-2A3-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Oct 29, 2015 at 11:24:47AM +0900, Tejun Heo wrote:
> Hello,
> 
> That's weird.
> 
> On Wed, Oct 28, 2015 at 08:57:28PM +0900, Tetsuo Handa wrote:
> > [  272.851035] Showing busy workqueues and worker pools:
> > [  272.852583] workqueue events: flags=0x0
> > [  272.853942]   pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256
> > [  272.855781]     pending: vmw_fb_dirty_flush [vmwgfx]
> > [  272.857500]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
> > [  272.859359]     pending: vmpressure_work_fn
> > [  272.860840] workqueue events_freezable_power_: flags=0x84
> > [  272.862461]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
> > [  272.864479]     in-flight: 11286:disk_events_workfn
> 
> What's this guy doing?  Can you get stack dump on 11286 (or whatever
> is in flight in the next lockup)?

Wait, this series doesn't include Tetsuo's change.  Of course it won't
fix the deadlock problem.  What's necessary is Tetsuo's patch +
WQ_MEM_RECLAIM.

Thanks.

-- 
tejun
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Thread

[patch 0/3] vmstat: Various enhancements Christoph Lameter <cl@linux.com> - 2015-10-28 03:50 +0100
  Re: [patch 3/3] vmstat: Create our own workqueue Tejun Heo <htejun@gmail.com> - 2015-10-28 03:50 +0100
    Re: [patch 3/3] vmstat: Create our own workqueue Christoph Lameter <cl@linux.com> - 2015-10-28 04:10 +0100
      Re: [patch 3/3] vmstat: Create our own workqueue Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-28 13:00 +0100
        Re: [patch 3/3] vmstat: Create our own workqueue Christoph Lameter <cl@linux.com> - 2015-10-28 23:40 +0100
        Re: [patch 3/3] vmstat: Create our own workqueue Tejun Heo <htejun@gmail.com> - 2015-10-29 03:30 +0100
          Re: [patch 3/3] vmstat: Create our own workqueue Tejun Heo <htejun@gmail.com> - 2015-10-29 04:10 +0100
            Re: [patch 3/3] vmstat: Create our own workqueue Christoph Lameter <cl@linux.com> - 2015-10-30 02:10 +0100
              Re: [patch 3/3] vmstat: Create our own workqueue Tejun Heo <htejun@gmail.com> - 2015-10-31 02:20 +0100
              Re: [patch 3/3] vmstat: Create our own workqueue Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-10-31 03:50 +0100
  [patch 3/3] vmstat: Create our own workqueue Christoph Lameter <cl@linux.com> - 2015-10-28 03:50 +0100
  [patch 1/3] vmstat: Make pageset processing optional in refresh_cpu_vm_stats Christoph Lameter <cl@linux.com> - 2015-10-28 03:50 +0100
  [patch 2/3] vmstat: make vmstat_updater deferrable again and shut down on idle Christoph Lameter <cl@linux.com> - 2015-10-28 03:50 +0100

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