linux-kernel - Re: [patch 4/8] mm: memcg: lookup_page

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Message-Id: <20111124090112.93bde2b4.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 24 Nov 2011 09:01:12 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 4/8] mm: memcg: lookup_page_cgroup (almost) never
 returns NULL

On Wed, 23 Nov 2011 16:42:27 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> From: Johannes Weiner <jweiner@...hat.com>
> 
> Pages have their corresponding page_cgroup descriptors set up before
> they are used in userspace, and thus managed by a memory cgroup.
> 
> The only time where lookup_page_cgroup() can return NULL is in the
> page sanity checking code that executes while feeding pages into the
> page allocator for the first time.
> 
> Remove the NULL checks against lookup_page_cgroup() results from all
> callsites where we know that corresponding page_cgroup descriptors
> must be allocated.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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