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>
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