Re: [patch 4/8] mm: memcg: lookup_page_cgroup (almost) neverreturns NULL

[KAMEZAWA Hiroyuki]

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

> From: Johannes Weiner <jweiner@xxxxxxxxxx>
> 
> 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@xxxxxxxxxx>

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

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