Re: [PATCH 15/15] readahead: pagecache context based mmap read-around

[Rik van Riel]

On 02/23/2010 10:10 PM, Wu Fengguang wrote:
> Do mmap read-around when there are cached pages in the nearby 256KB
> (covered by one radix tree node).
>
> There is a failure case though: for a sequence of page faults at page
> index 64*i+1, i=1,2,3,..., this heuristic will keep doing pointless
> read-arounds.  Hopefully the pattern won't appear in real workloads.
> Note that the readahead heuristic has similiar failure case.
>
> CC: Nick Piggin<npiggin@xxxxxxx>
> Signed-off-by: Wu Fengguang<fengguang.wu@xxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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