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(parent: 1495f23) | patch
readahead: return early when readahead is disabled
authorWu Fengguang <fengguang.wu@intel.com>
Wed, 25 May 2011 00:12:28 +0000 (17:12 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 25 May 2011 15:39:26 +0000 (08:39 -0700)
commit275b12bf5486f6f531111fd3d7dbbf01df427cfe
treeebed0109eaa3e4a015bc1653f4d933f2e84c794ftree | snapshot
parent1495f230fa7750479c79e3656286b9183d662077commit | diff
readahead: return early when readahead is disabled

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: Wu Fengguang <fengguang.wu@intel.com>
Tested-by: Tim Chen <tim.c.chen@intel.com>
Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/filemap.c diff | blob | history
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