Re: [patch 1/5] mm: readahead: move radix tree hole searching here

[Rik van Riel <riel@redhat.com>]

On 05/01/2012 04:41 AM, Johannes Weiner wrote:
> The readahead code searches the page cache for non-present pages, or
> holes, to get a picture of the area surrounding a fault e.g.
>
> For this it sufficed to rely on the radix tree definition of holes,
> which is "empty tree slot".  This is about to change, though, because
> shadow page descriptors will be stored in the page cache when the real
> pages get evicted from memory.
>
> Fortunately, nobody outside the readahead code uses these functions
> and they have no internal knowledge of the radix tree structures, so
> just move them over to mm/readahead.c where they can later be adapted
> to handle the new definition of "page cache hole".
>
> Signed-off-by: Johannes Weiner<hannes@cmpxchg.org>

Reviewed-by: Rik van Riel <riel@redhat.com>

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