diff options
| author | Wu Fengguang <fengguang.wu@intel.com> | 2011-05-24 17:12:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:26 -0700 |
| commit | 275b12bf5486f6f531111fd3d7dbbf01df427cfe (patch) | |
| tree | ebed0109eaa3e4a015bc1653f4d933f2e84c794f /kernel/up.c | |
| 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>
Diffstat (limited to 'kernel/up.c')
0 files changed, 0 insertions, 0 deletions