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List: linux-mm
Subject: zone reclaim with slab avoid unecessary off node allocations.
From: Christoph Lameter <clameter () sgi ! com>
Date: 2006-08-29 18:11:34
Message-ID: Pine.LNX.4.64.0608291109260.19897 () schroedinger ! engr ! sgi ! com
[Download RAW message or body]
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>
Index: linux-2.6.18-rc4-mm3/mm/vmscan.c
===================================================================
--- linux-2.6.18-rc4-mm3.orig/mm/vmscan.c 2006-08-26 16:38:04.915153612 -0700
+++ linux-2.6.18-rc4-mm3/mm/vmscan.c 2006-08-27 15:48:25.948204824 -0700
@@ -1574,6 +1574,7 @@ static int __zone_reclaim(struct zone *z
.gfp_mask = gfp_mask,
.swappiness = vm_swappiness,
};
+ unsigned long slab_reclaimable;
disable_swap_token();
cond_resched();
@@ -1600,7 +1601,8 @@ static int __zone_reclaim(struct zone *z
} 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
@@ -1611,12 +1613,17 @@ static int __zone_reclaim(struct zone *z
* 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;
--
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