From: Christoph Lameter <cl@linux.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org, mhocko@kernel.org,
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: Wed, 21 Oct 2015 09:22:40 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1510210920200.5611@east.gentwo.org> (raw)
In-Reply-To: <201510212126.JIF90648.HOOFJVFQLMStOF@I-love.SAKURA.ne.jp>
On Wed, 21 Oct 2015, Tetsuo Handa wrote:
> However, if a workqueue which is processed before vmstat_update
> workqueue is processed got stuck inside memory allocation request,
> values in vm_stat_diff[] cannot be merged into vm_stat[]. As a result,
> zone_reclaimable() continues using outdated vm_stat[] values and the
> task which is doing direct reclaim path thinks that there are reclaimable
> pages and therefore continues looping. The consequence is a silent
> livelock (hang up without any kernel messages) because the OOM killer
> will not be invoked.
The diffs will be merged if they reach a certain threshold regardless. You
can decrease that threshhold. See calculate_pressure_threshhold().
Why is the merging not occurring if a process gets stuck? Workrequests are
not blocked by a process being stuck doing memory allocation or reclaim.
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next prev parent reply other threads:[~2015-10-21 14:22 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 [this message]
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
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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