linux-kernel - Re: [PATCH 4/6] staging: android/lowmemorykiller: Better mm handling

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Message-ID: <20120208153447.GC15782@redhat.com>
Date:	Wed, 8 Feb 2012 16:34:47 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	San Mehat <san@...gle.com>, Colin Cross <ccross@...roid.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 4/6] staging: android/lowmemorykiller: Better mm
	handling

On 02/06, Anton Vorontsov wrote:
>
> LMK should not directly check for task->mm. The reason is that the
> process' threads may exit or detach its mm via use_mm(), but other
> threads may still have a valid mm. To catch this we use
> find_lock_task_mm(), which walks up all threads and returns an
> appropriate task (with lock held).

Reviewed-by: Oleg Nesterov <oleg@...hat.com>

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