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

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Date:	Thu, 29 Oct 2015 12:08:22 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	cl@...ux.com, akpm@...ux-foundation.org, mhocko@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, hannes@...xchg.org, mgorman@...e.de
Subject: Re: [patch 3/3] vmstat: Create our own workqueue

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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