From: Fengguang Wu <fengguang.wu@intel.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>,
Minchan Kim <minchan@kernel.org>, Rik van Riel <riel@redhat.com>,
Ying Han <yinghan@google.com>, Greg Thelen <gthelen@google.com>,
Hugh Dickins <hughd@google.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH -mm] memcg: prevent from OOM with too many dirty pages
Date: Wed, 20 Jun 2012 17:55:46 +0800 [thread overview]
Message-ID: <20120620095546.GB8765@localhost> (raw)
In-Reply-To: <20120620092011.GB4011@suse.de>
> > Finally, I wonder if there should be some timeout of that wait. I
> > don't know why, but I wouldn't be surprised if we hit some glitch which
> > causes us to add one!
> >
>
> If we hit such a situation it means that flush is no longer working which
> is interesting in itself. I guess one possibility where it can occur is
> if we hit global dirty limits (or memcg dirty limits when they exist)
> and the page is backed by NFS that is disconnected. That would stall here
> potentially forever but it's already the case that a system that hits its
> dirty limits with a disconnected NFS is in trouble and a timeout here will
> not do much to help.
Agreed. I've run into such cases and cannot login even locally because
the shell will be blocked trying to write even 1 byte at startup time.
Any opened shells are also stalled on writing to .bash_history etc.
Thanks,
Fengguang
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next prev parent reply other threads:[~2012-06-20 9:55 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-19 14:50 [PATCH -mm] memcg: prevent from OOM with too many dirty pages Michal Hocko
2012-06-19 22:00 ` Andrew Morton
2012-06-20 8:27 ` Michal Hocko
2012-06-20 9:20 ` Mel Gorman
2012-06-20 9:55 ` Fengguang Wu [this message]
2012-06-20 9:59 ` Michal Hocko
2012-06-20 10:11 ` [PATCH v2 " Michal Hocko
2012-07-12 1:57 ` Hugh Dickins
2012-07-12 2:21 ` Andrew Morton
2012-07-12 3:13 ` Hugh Dickins
2012-07-12 7:05 ` Michal Hocko
2012-07-12 21:13 ` Andrew Morton
2012-07-12 22:42 ` Hugh Dickins
2012-07-13 8:21 ` Michal Hocko
2012-07-16 8:30 ` Hugh Dickins
2012-07-16 8:35 ` [PATCH mmotm] memcg: further prevent " Hugh Dickins
2012-07-16 9:26 ` Michal Hocko
2012-07-17 4:52 ` Hugh Dickins
2012-07-17 6:33 ` Michal Hocko
2012-07-16 21:08 ` Andrew Morton
2012-07-16 8:10 ` [PATCH v2 -mm] memcg: prevent from " Hugh Dickins
2012-07-16 8:48 ` Michal Hocko
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