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由 Wu Fengguang 提交于
Reduce readahead overheads by returning early in do_sync_mmap_readahead(). tmpfs has ra_pages=0 and it can page fault really fast (not constraint by IO if not swapping). Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Tested-by: NTim Chen <tim.c.chen@intel.com> Reported-by: NAndi Kleen <ak@linux.intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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