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| author | Christoph Lameter <clameter@sgi.com> | 2006-09-25 23:31:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:48:52 -0700 |
| commit | 83e33a4711760469f5c3861b8ffea4947656d4eb (patch) | |
| tree | 3c6b534760dee49a77157eb6512aeb329e19bc2c | |
| parent | 0ff38490c836dc379ff7ec45b10a15a662f4e5f6 (diff) | |
| download | lwn-83e33a4711760469f5c3861b8ffea4947656d4eb.tar.gz lwn-83e33a4711760469f5c3861b8ffea4947656d4eb.zip | |
[PATCH] zone reclaim with slab: avoid unecessary off node allocations
Minor performance fix.
If we reclaimed enough slab pages from a zone then we can avoid going off
node with the current allocation. Take care of updating nr_reclaimed when
reclaiming from the slab.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | mm/vmscan.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 089e943c4d38..b950f193816e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1566,6 +1566,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) .gfp_mask = gfp_mask, .swappiness = vm_swappiness, }; + unsigned long slab_reclaimable; disable_swap_token(); cond_resched(); @@ -1592,7 +1593,8 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) } while (priority >= 0 && nr_reclaimed < nr_pages); } - if (zone_page_state(zone, NR_SLAB_RECLAIMABLE) > zone->min_slab_pages) { + slab_reclaimable = zone_page_state(zone, NR_SLAB_RECLAIMABLE); + if (slab_reclaimable > zone->min_slab_pages) { /* * shrink_slab() does not currently allow us to determine how * many pages were freed in this zone. So we take the current @@ -1603,12 +1605,17 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) * Note that shrink_slab will free memory on all zones and may * take a long time. */ - unsigned long limit = zone_page_state(zone, - NR_SLAB_RECLAIMABLE) - nr_pages; - while (shrink_slab(sc.nr_scanned, gfp_mask, order) && - zone_page_state(zone, NR_SLAB_RECLAIMABLE) > limit) + zone_page_state(zone, NR_SLAB_RECLAIMABLE) > + slab_reclaimable - nr_pages) ; + + /* + * Update nr_reclaimed by the number of slab pages we + * reclaimed from this zone. + */ + nr_reclaimed += slab_reclaimable - + zone_page_state(zone, NR_SLAB_RECLAIMABLE); } p->reclaim_state = NULL; |