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

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Message-ID: <20151029022447.GB27115@mtj.duckdns.org>
Date:	Thu, 29 Oct 2015 11:24:47 +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

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)?

> [  272.866065]     pending: disk_events_workfn
> [  272.867587] workqueue vmstat: flags=0x8
> [  272.868942]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
> [  272.870785]     pending: vmstat_update
> [  272.872248] pool 2: cpus=1 node=0 flags=0x0 nice=0 workers=4 idle: 14 218 43

Thanks.

-- 
tejun
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