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authorMartin Hicks <mort@sgi.com>2005-06-21 17:14:43 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-21 18:46:14 -0700
commit1e7e5a9048b30c57ba1ddaa6cdf59b21b65cde99 (patch)
tree26eb9c483718ca1a0fad23597c0dfd3a69e9f080 /mm
parent0c35bbadc59f5ed105c34471143eceb4c0dd9c95 (diff)
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[PATCH] VM: rate limit early reclaim
When early zone reclaim is turned on the LRU is scanned more frequently when a zone is low on memory. This limits when the zone reclaim can be called by skipping the scan if another thread (either via kswapd or sync reclaim) is already reclaiming from the zone. Signed-off-by: Martin Hicks <mort@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c1
-rw-r--r--mm/vmscan.c10
2 files changed, 11 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a9da20b..2019c1b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1738,6 +1738,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
zone->nr_scan_inactive = 0;
zone->nr_active = 0;
zone->nr_inactive = 0;
+ atomic_set(&zone->reclaim_in_progress, -1);
if (!size)
continue;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7da8469..24da725 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -900,7 +900,9 @@ shrink_caches(struct zone **zones, struct scan_control *sc)
if (zone->all_unreclaimable && sc->priority != DEF_PRIORITY)
continue; /* Let kswapd poll it */
+ atomic_inc(&zone->reclaim_in_progress);
shrink_zone(zone, sc);
+ atomic_dec(&zone->reclaim_in_progress);
}
}
@@ -1111,7 +1113,9 @@ scan:
sc.nr_reclaimed = 0;
sc.priority = priority;
sc.swap_cluster_max = nr_pages? nr_pages : SWAP_CLUSTER_MAX;
+ atomic_inc(&zone->reclaim_in_progress);
shrink_zone(zone, &sc);
+ atomic_dec(&zone->reclaim_in_progress);
reclaim_state->reclaimed_slab = 0;
nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
lru_pages);
@@ -1354,9 +1358,15 @@ int zone_reclaim(struct zone *zone, unsigned int gfp_mask, unsigned int order)
else
sc.swap_cluster_max = SWAP_CLUSTER_MAX;
+ /* Don't reclaim the zone if there are other reclaimers active */
+ if (!atomic_inc_and_test(&zone->reclaim_in_progress))
+ goto out;
+
shrink_zone(zone, &sc);
total_reclaimed = sc.nr_reclaimed;
+ out:
+ atomic_dec(&zone->reclaim_in_progress);
return total_reclaimed;
}