From: Tejun Heo <htejun@gmail.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: cl@linux.com, akpm@linux-foundation.org, mhocko@kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org, hannes@cmpxchg.org,
mgorman@suse.de
Subject: Re: [patch 3/3] vmstat: Create our own workqueue
Date: Thu, 29 Oct 2015 12:08:22 +0900 [thread overview]
Message-ID: <20151029030822.GD27115@mtj.duckdns.org> (raw)
In-Reply-To: <20151029022447.GB27115@mtj.duckdns.org>
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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next prev parent reply other threads:[~2015-10-29 3:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-28 2:41 [patch 0/3] vmstat: Various enhancements Christoph Lameter
2015-10-28 2:41 ` [patch 1/3] vmstat: Make pageset processing optional in refresh_cpu_vm_stats Christoph Lameter
2015-10-28 2:41 ` [patch 2/3] vmstat: make vmstat_updater deferrable again and shut down on idle Christoph Lameter
2015-10-28 2:41 ` [patch 3/3] vmstat: Create our own workqueue Christoph Lameter
2015-10-28 2:43 ` Tejun Heo
2015-10-28 3:04 ` Christoph Lameter
2015-10-28 11:57 ` Tetsuo Handa
2015-10-28 22:32 ` Christoph Lameter
2015-10-29 2:24 ` Tejun Heo
2015-10-29 3:08 ` Tejun Heo [this message]
2015-10-30 1:01 ` Christoph Lameter
2015-10-31 1:15 ` Tejun Heo
2015-10-31 2:43 ` Tetsuo Handa
2015-11-02 16:12 ` Christoph Lameter
2015-11-02 16:52 ` Tetsuo Handa
2015-11-02 18:10 ` Christoph Lameter
2015-11-02 19:11 ` Tejun Heo
2015-11-06 11:28 ` Tetsuo Handa
2015-11-06 12:56 ` Christoph Lameter
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