From: Christoph Lameter <cl@linux.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: linux-mm@kvack.org
Subject: Re: mm/slab: What is cache_reap work for?
Date: Fri, 30 Jun 2017 08:58:30 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1706300856530.3291@east.gentwo.org> (raw)
In-Reply-To: <201706271935.DJJ18719.OMFLFFHJSOVtQO@I-love.SAKURA.ne.jp>
On Tue, 27 Jun 2017, Tetsuo Handa wrote:
> I hit an unable to invoke the OOM killer lockup shown below. According to
> "cpus=2 node=0 flags=0x0 nice=0" part, it seems that cache_reap (in mm/slab.c)
> work stuck waiting for disk_events_workfn (in block/genhd.c) work to complete.
Cache reaping in SLAB is the expiration of objects since they are deemed
to be cache cold after while. Reaping is a tick driven worker thread that
calls other functions that are used during regular slab allocation and
freeing. Maybe someone added code that can cause deadlocks if invoked from
the tick?
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next prev parent reply other threads:[~2017-06-30 13:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-27 10:35 Tetsuo Handa
2017-06-30 13:58 ` Christoph Lameter [this message]
2017-07-04 13:15 ` Tetsuo Handa
2017-07-05 14:08 ` Christoph Lameter
2017-07-06 12:48 ` Tetsuo Handa
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