linux-kernel - Re: v3.4-rc2 out-of-memory problems (was Re: 3.4-rc1 sticks-and-crashs)

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Message-ID: <CAMbhsRQmkW=Bz-rxy_8gs1qUsgjdsMJ+YLaNHetPoFQq1AgKMQ@mail.gmail.com>
Date:	Mon, 9 Apr 2012 18:37:58 -0700
From:	Colin Cross <ccross@...gle.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>,
	Rabin Vincent <rabin.vincent@...ricsson.com>,
	Christian Bejram <christian.bejram@...ricsson.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org
Subject: Re: v3.4-rc2 out-of-memory problems (was Re: 3.4-rc1 sticks-and-crashs)

On Mon, Apr 9, 2012 at 6:33 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Mon, 9 Apr 2012, Colin Cross wrote:
>
>> Before Anton's fix, iterating the tasklist involved taking every task
>> lock, which probably made it very expensive.
>
> I'm not sure of the fix you're referring to, but it's not in 3.4-rc2
> because lowmem_shrink() still does find_lock_task_mm() for every user
> process on the system, which is necessary to safely do get_mm_rss().

I confused "staging: android/lowmemorykiller: Don't grab
tasklist_lock" and "staging: android/lowmemorykiller: Better mm
handling".  You're right, it still grabs the task lock.
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