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| author | Jack Steiner <steiner@sgi.com> | 2010-05-26 14:42:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:44 -0700 |
| commit | 0ac0c0d0f837c499afd02a802f9cf52d3027fa3b (patch) | |
| tree | c20a7306d4b727722556af1aa5565855686aee07 /include/linux/bitmap.h | |
| parent | 6adef3ebe570bcde67fd6c16101451ddde5712b5 (diff) | |
| download | linux-0ac0c0d0f837c499afd02a802f9cf52d3027fa3b.tar.gz linux-0ac0c0d0f837c499afd02a802f9cf52d3027fa3b.tar.bz2 linux-0ac0c0d0f837c499afd02a802f9cf52d3027fa3b.zip | |
cpusets: randomize node rotor used in cpuset_mem_spread_node()
Some workloads that create a large number of small files tend to assign
too many pages to node 0 (multi-node systems). Part of the reason is that
the rotor (in cpuset_mem_spread_node()) used to assign nodes starts at
node 0 for newly created tasks.
This patch changes the rotor to be initialized to a random node number of
the cpuset.
[akpm@linux-foundation.org: fix layout]
[Lee.Schermerhorn@hp.com: Define stub numa_random() for !NUMA configuration]
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Paul Menage <menage@google.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/bitmap.h')
| -rw-r--r-- | include/linux/bitmap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index daf8c480c786..6fb2720882fc 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -141,6 +141,7 @@ extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order); extern void bitmap_release_region(unsigned long *bitmap, int pos, int order); extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order); extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits); +extern int bitmap_ord_to_pos(const unsigned long *bitmap, int n, int bits); #define BITMAP_LAST_WORD_MASK(nbits) \ ( \ |