diff options
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 665b090b6c7..060e4c19140 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2399,6 +2399,7 @@ loop_again: for (i = 0; i <= end_zone; i++) { struct zone *zone = pgdat->node_zones + i; int nr_slab; + unsigned long balance_gap; if (!populated_zone(zone)) continue; @@ -2415,11 +2416,20 @@ loop_again: mem_cgroup_soft_limit_reclaim(zone, order, sc.gfp_mask); /* - * We put equal pressure on every zone, unless one - * zone has way too many pages free already. + * We put equal pressure on every zone, unless + * one zone has way too many pages free + * already. The "too many pages" is defined + * as the high wmark plus a "gap" where the + * gap is either the low watermark or 1% + * of the zone, whichever is smaller. */ + balance_gap = min(low_wmark_pages(zone), + (zone->present_pages + + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) / + KSWAPD_ZONE_BALANCE_GAP_RATIO); if (!zone_watermark_ok_safe(zone, order, - 8*high_wmark_pages(zone), end_zone, 0)) + high_wmark_pages(zone) + balance_gap, + end_zone, 0)) shrink_zone(priority, zone, &sc); reclaim_state->reclaimed_slab = 0; nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL, |