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: Fri, 23 Oct 2015 00:14:14 +0900 [thread overview]
Message-ID: <20151022151414.GF30579@mtj.duckdns.org> (raw)
In-Reply-To: <alpine.DEB.2.20.1510220939310.23718@east.gentwo.org>
Hello,
On Thu, Oct 22, 2015 at 09:41:11AM -0500, Christoph Lameter wrote:
> > If this is actually a legit busy-waiting cyclic dependency, just let
> > me know.
>
> There is no dependency of the vmstat updater on anything.
> They can run anytime. If there is a dependency then its created by the
> kworker subsystem itself.
Sure, the other direction is from workqueue concurrency detection. I
was asking whether a work item can busy-wait on vmstat_update work
item cuz that's what confuses workqueue. Looking at the original
dump, the pool has two idle workers indicating that the workqueue
wasn't short of execution resources and it really looks like that work
item was live-locking the pool. I'll go ahead and add WQ_IMMEDIATE.
Thanks.
--
tejun
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next prev parent reply other threads:[~2015-10-22 15:14 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-21 12:26 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
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 [this message]
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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