linux-kernel - Re: [patch 01/12] mm: oom_kill: remove unnecessary locking in oom

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Message-ID: <alpine.DEB.2.10.1503261229350.9410@chino.kir.corp.google.com>
Date:	Thu, 26 Mar 2015 12:30:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Huang Ying <ying.huang@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [patch 01/12] mm: oom_kill: remove unnecessary locking in
 oom_enable()

On Thu, 26 Mar 2015, Michal Hocko wrote:

> I am wrong here! pagefault_out_of_memory takes the lock and so the whole
> mem_cgroup_out_of_memory is called under the same lock.

If all userspace processes are frozen by the time oom_killer_disable() is 
called, then there shouldn't be any race with the android lmk calling 
mark_tsk_oom_victim() either, so I assume that you're acking this patch?
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