From: Tejun Heo <htejun@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
mhocko@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
David Rientjes <rientjes@google.com>,
oleg@redhat.com, kwalker@redhat.com, akpm@linux-foundation.org,
hannes@cmpxchg.org, vdavydov@parallels.com, skozina@redhat.com,
mgorman@suse.de, riel@redhat.com
Subject: Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks
Date: Thu, 22 Oct 2015 23:09:44 +0900 [thread overview]
Message-ID: <20151022140944.GA30579@mtj.duckdns.org> (raw)
In-Reply-To: <alpine.DEB.2.20.1510220836430.18486@east.gentwo.org>
On Thu, Oct 22, 2015 at 08:39:11AM -0500, Christoph Lameter wrote:
> On Thu, 22 Oct 2015, Tetsuo Handa wrote:
>
> > The problem would be that the "struct task_struct" to execute vmstat_update
> > job does not exist, and will not be able to create one on demand because we
> > are stuck at __GFP_WAIT allocation. Therefore adding a dedicated kernel
> > thread for vmstat_update job would work. But ...
>
> Yuck. Can someone please get this major screwup out of the work queue
> subsystem? Tejun?
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.
Thanks.
--
tejun
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next prev parent reply other threads:[~2015-10-22 14:09 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-21 12:26 [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Tetsuo Handa
2015-10-21 13:03 ` Michal Hocko
2015-10-21 14:22 ` Christoph Lameter
2015-10-21 14:33 ` Michal Hocko
2015-10-21 14:49 ` Christoph Lameter
2015-10-21 14:55 ` Michal Hocko
2015-10-21 15:39 ` Tetsuo Handa
2015-10-21 17:16 ` Christoph Lameter
2015-10-22 11:37 ` Tetsuo Handa
2015-10-22 13:39 ` Christoph Lameter
2015-10-22 14:09 ` Tejun Heo [this message]
2015-10-22 14:21 ` Tejun Heo
2015-10-22 14:23 ` Christoph Lameter
2015-10-22 14:24 ` Tejun Heo
2015-10-22 14:25 ` Christoph Lameter
2015-10-22 14:33 ` Tejun Heo
2015-10-22 14:41 ` Christoph Lameter
2015-10-22 15:14 ` Tejun Heo
2015-10-23 4:26 ` Tejun Heo
2015-11-02 15:01 ` Michal Hocko
2015-11-02 19:20 ` Tejun Heo
2015-11-03 2:32 ` Tetsuo Handa
2015-11-03 19:43 ` Tejun Heo
2015-11-05 14:59 ` Tetsuo Handa
2015-11-05 17:45 ` Christoph Lameter
2015-11-06 0:16 ` Tejun Heo
2015-11-11 15:44 ` Michal Hocko
2015-11-11 16:03 ` Michal Hocko
2015-10-22 14:22 ` Christoph Lameter
2015-10-22 15:06 ` Michal Hocko
2015-10-22 15:15 ` Tejun Heo
2015-10-22 15:33 ` Christoph Lameter
2015-10-23 8:37 ` Michal Hocko
2015-10-23 11:43 ` Make vmstat deferrable again (was Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks) Christoph Lameter
2015-10-23 12:07 ` Sergey Senozhatsky
2015-10-23 14:12 ` Christoph Lameter
2015-10-23 14:49 ` Sergey Senozhatsky
2015-10-23 16:10 ` Christoph Lameter
2015-10-22 15:35 ` [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Michal Hocko
2015-10-22 15:37 ` Tejun Heo
2015-10-22 15:49 ` Michal Hocko
2015-10-22 18:42 ` Tejun Heo
2015-10-22 21:42 ` [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()checks Tetsuo Handa
2015-10-22 22:47 ` Tejun Heo
2015-10-23 8:36 ` Michal Hocko
2015-10-23 10:37 ` Tejun Heo
2015-10-23 8:33 ` [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks Michal Hocko
2015-10-23 10:36 ` Tejun Heo
2015-10-23 11:11 ` Michal Hocko
2015-10-23 12:25 ` Tetsuo Handa
2015-10-23 18:23 ` Tejun Heo
2015-10-25 10:52 ` Tetsuo Handa
2015-10-25 22:47 ` Tejun Heo
2015-10-27 9:22 ` Michal Hocko
2015-10-27 10:55 ` Tejun Heo
2015-10-27 12:07 ` Michal Hocko
2015-10-23 18:21 ` Tejun Heo
2015-10-27 9:16 ` Michal Hocko
2015-10-27 10:52 ` Tejun Heo
2015-10-27 11:07 ` [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()checks Tetsuo Handa
2015-10-27 11:30 ` Tejun Heo
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