From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
bsingharora@gmail.com, cgroups@vger.kernel.org,
linux-mm@kvack.org, lizefan@huawei.com
Subject: Re: [PATCH 3/3] memcg: simplify mem_cgroup_reclaim_iter
Date: Fri, 7 Jun 2013 16:25:57 -0700 [thread overview]
Message-ID: <20130607232557.GL14781@mtj.dyndns.org> (raw)
In-Reply-To: <20130607073754.GA8117@dhcp22.suse.cz>
Hello, Michal.
On Fri, Jun 07, 2013 at 09:37:54AM +0200, Michal Hocko wrote:
> > Oh yeah, it is racy. That's what I meant by "not having to be
> > completely strict". The race window is small enough and it's not like
> > we're messing up refcnt or may end up with use-after-free.
>
> But it would potentially pin (aka leak) the memcg for ever.
It wouldn't be anything systemetic tho - race condition's likliness is
low and increases with the frequency of reclaim iteration, which at
the same time means that it's likely to remedy itself pretty soon.
I'm doubtful it'd matter. If it's still bothering, we sure can do it
from RCU callback.
Thanks.
--
tejun
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next prev parent reply other threads:[~2013-06-07 23:26 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-04 0:44 [PATCHSET] memcg: fix and reimplement iterator Tejun Heo
2013-06-04 0:44 ` [PATCH 1/3] memcg: fix subtle memory barrier bug in mem_cgroup_iter() Tejun Heo
2013-06-04 13:03 ` Michal Hocko
2013-06-04 13:58 ` Johannes Weiner
2013-06-04 15:29 ` Michal Hocko
2013-06-04 0:44 ` [PATCH 2/3] memcg: restructure mem_cgroup_iter() Tejun Heo
2013-06-04 13:21 ` Michal Hocko
2013-06-04 20:51 ` Tejun Heo
2013-06-04 0:44 ` [PATCH 3/3] memcg: simplify mem_cgroup_reclaim_iter Tejun Heo
2013-06-04 13:18 ` Michal Hocko
2013-06-04 20:50 ` Tejun Heo
2013-06-04 21:28 ` Michal Hocko
2013-06-04 21:55 ` Tejun Heo
2013-06-05 7:30 ` Michal Hocko
2013-06-05 8:20 ` Tejun Heo
2013-06-05 8:36 ` Michal Hocko
2013-06-05 8:44 ` Tejun Heo
2013-06-05 8:55 ` Michal Hocko
2013-06-05 9:03 ` Tejun Heo
2013-06-05 14:39 ` Johannes Weiner
2013-06-05 14:50 ` Johannes Weiner
2013-06-05 14:56 ` Michal Hocko
2013-06-05 17:22 ` Tejun Heo
2013-06-05 19:45 ` Johannes Weiner
2013-06-05 20:06 ` Tejun Heo
2013-06-05 21:17 ` Johannes Weiner
2013-06-05 22:20 ` Tejun Heo
2013-06-05 22:27 ` Tejun Heo
2013-06-06 11:50 ` Michal Hocko
2013-06-07 0:52 ` Tejun Heo
2013-06-07 7:37 ` Michal Hocko
2013-06-07 23:25 ` Tejun Heo [this message]
2013-06-10 8:02 ` Michal Hocko
2013-06-10 19:54 ` Tejun Heo
2013-06-10 20:48 ` Michal Hocko
2013-06-10 23:13 ` Tejun Heo
2013-06-11 7:27 ` Michal Hocko
2013-06-11 7:44 ` Tejun Heo
2013-06-11 7:55 ` Michal Hocko
2013-06-11 8:00 ` Tejun Heo
2013-06-04 21:40 ` Johannes Weiner
2013-06-04 21:49 ` Tejun Heo
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