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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-06-16 15:31:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-16 19:47:28 -0700 |
| commit | 1ebf26a9b338534def47f307c6c8694b6dfc0a79 (patch) | |
| tree | 26829a8cc727388c0da8eea6de38d7ba0eda2a47 /mm/madvise.c | |
| parent | bb1f17b0372de93758653ca3454bc0df18dc2e5c (diff) | |
| download | linux-1ebf26a9b338534def47f307c6c8694b6dfc0a79.tar.gz linux-1ebf26a9b338534def47f307c6c8694b6dfc0a79.tar.bz2 linux-1ebf26a9b338534def47f307c6c8694b6dfc0a79.zip | |
readahead: make mmap_miss an unsigned int
This makes the performance impact of possible mmap_miss wrap around to be
temporary and tolerable: i.e. MMAP_LOTSAMISS=100 extra readarounds.
Otherwise if ever mmap_miss wraps around to negative, it takes INT_MAX
cache misses to bring it back to normal state. During the time mmap
readaround will be _enabled_ for whatever wild random workload. That's
almost permanent performance impact.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
0 files changed, 0 insertions, 0 deletions