| commit | 275b12bf5486f6f531111fd3d7dbbf01df427cfe | [log] [tgz] |
|---|---|---|
| author | Wu Fengguang <fengguang.wu@intel.com> | Tue May 24 17:12:28 2011 -0700 |
| committer | Linus Torvalds <torvalds@linux-foundation.org> | Wed May 25 08:39:26 2011 -0700 |
| tree | ebed0109eaa3e4a015bc1653f4d933f2e84c794f | |
| parent | 1495f230fa7750479c79e3656286b9183d662077 [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>