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mm: numa: limit scope of lock for NUMA migrate rate limiting

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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>
This commit is contained in:
Mel Gorman 2014-01-21 15:50:59 -08:00 • committed by Linus Torvalds
parent 1c30e0177e
commit 1c5e9c27cb
2 changed files with 13 additions and 13 deletions
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5
include/linux/mmzone.h
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@ -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 */