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@xxxxxxxxxxx>
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