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[PATCH] zoned vm counters: zone_reclaim: remove /proc/sys/vm/zone_reclaim_interval

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The zone_reclaim_interval was necessary because we were not able to determine
how many unmapped pages exist in a zone.  Therefore we had to scan in
intervals to figure out if any pages were unmapped.

With the zoned counters and NR_ANON_PAGES we now know the number of pagecache
pages and the number of mapped pages in a zone.  So we can simply skip the
reclaim if there is an insufficient number of unmapped pages.  We use
SWAP_CLUSTER_MAX as the boundary.

Drop all support for /proc/sys/vm/zone_reclaim_interval.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter
2006-06-30 01:55:37 -07:00
committed by Linus Torvalds
parent f3dbd34460
commit 34aa1330f9
5 changed files with 10 additions and 50 deletions
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31
mm/vmscan.c
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@@ -1517,11 +1517,6 @@ int zone_reclaim_mode __read_mostly;
#define RECLAIM_SWAP (1<<2) /* Swap pages out during reclaim */
#define RECLAIM_SLAB (1<<3) /* Do a global slab shrink if the zone is out of memory */
/*
* Mininum time between zone reclaim scans
*/
int zone_reclaim_interval __read_mostly = 30*HZ;
/*
* Priority for ZONE_RECLAIM. This determines the fraction of pages
* of a node considered for each zone_reclaim. 4 scans 1/16th of
@@ -1587,16 +1582,6 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
p->reclaim_state = NULL;
current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE);
if (nr_reclaimed == 0) {
/*
* We were unable to reclaim enough pages to stay on node. We
* now allow off node accesses for a certain time period before
* trying again to reclaim pages from the local zone.
*/
zone->last_unsuccessful_zone_reclaim = jiffies;
}
return nr_reclaimed >= nr_pages;
}
@@ -1606,13 +1591,17 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
int node_id;
/*
* Do not reclaim if there was a recent unsuccessful attempt at zone
* reclaim. In that case we let allocations go off node for the
* zone_reclaim_interval. Otherwise we would scan for each off-node
* page allocation.
* Do not reclaim if there are not enough reclaimable pages in this
* zone that would satify this allocations.
*
* All unmapped pagecache pages are reclaimable.
*
* Both counters may be temporarily off a bit so we use
* SWAP_CLUSTER_MAX as the boundary. It may also be good to
* leave a few frequently used unmapped pagecache pages around.
*/
if (time_before(jiffies,
zone->last_unsuccessful_zone_reclaim + zone_reclaim_interval))
if (zone_page_state(zone, NR_FILE_PAGES) -
zone_page_state(zone, NR_FILE_MAPPED) < SWAP_CLUSTER_MAX)
return 0;
/*