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| author | Mel Gorman <mgorman@suse.de> | 2014-01-21 15:50:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 16:19:48 -0800 |
| commit | 1c5e9c27cbd966c7f0038698d5dcd5ada3574f47 (patch) | |
| tree | a546cec0019aa3b726ba06e50ce38f960ee8f222 /include/linux/mmzone.h | |
| parent | 1c30e0177e4f41a11cb88b0f1f056ccebfe0fff4 (diff) | |
| download | linux-1c5e9c27cbd966c7f0038698d5dcd5ada3574f47.tar.gz linux-1c5e9c27cbd966c7f0038698d5dcd5ada3574f47.tar.bz2 linux-1c5e9c27cbd966c7f0038698d5dcd5ada3574f47.zip | |
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.h | 5 |
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 */ |