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authorMel Gorman <mgorman@suse.de>2014-01-22 03:50:59 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-22 04:19:48 +0400
commit1c5e9c27cbd966c7f0038698d5dcd5ada3574f47 (patch)
treea546cec0019aa3b726ba06e50ce38f960ee8f222 /include/linux/mmzone.h
parent1c30e0177e4f41a11cb88b0f1f056ccebfe0fff4 (diff)
downloadlinux-1c5e9c27cbd966c7f0038698d5dcd5ada3574f47.tar.xz
mm: numa: limit scope of lock for NUMA migrate rate limiting
NUMA migrate rate limiting protects a migration counter and window using a lock but in some cases this can be a contended lock. It is not critical that the number of pages be perfect, lost updates are acceptable. Reduce the importance of this lock. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Alex Thorlton <athorlton@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/mmzone.h')
-rw-r--r--include/linux/mmzone.h5
1 files changed, 1 insertions, 4 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 67ab5febabf7..5f2052c83154 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -764,10 +764,7 @@ typedef struct pglist_data {
int kswapd_max_order;
enum zone_type classzone_idx;
#ifdef CONFIG_NUMA_BALANCING
- /*
- * Lock serializing the per destination node AutoNUMA memory
- * migration rate limiting data.
- */
+ /* Lock serializing the migrate rate limiting window */
spinlock_t numabalancing_migrate_lock;
/* Rate limiting time interval */