diff options
| author | Christoph Lameter <clameter@sgi.com> | 2006-06-30 01:55:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-30 11:25:35 -0700 |
| commit | 34aa1330f9b3c5783d269851d467326525207422 (patch) | |
| tree | a47db4fa53527ea937dee9e763267ab21865ce11 /mm | |
| parent | f3dbd34460ff54962d3e3244b6bcb7f5295356e6 (diff) | |
[PATCH] zoned vm counters: zone_reclaim: remove /proc/sys/vm/zone_reclaim_interval
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmscan.c | 31 |
1 files changed, 10 insertions, 21 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 2f0390161c0..0960846d649 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1518,11 +1518,6 @@ int zone_reclaim_mode __read_mostly; #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 * a zone. @@ -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; /* |