1 = Zone reclaim on
2 = Zone reclaim writes dirty pages out
4 = Zone reclaim swaps pages
+8 = Also do a global slab reclaim pass
zone_reclaim_mode is set during bootup to 1 if it is determined that pages
from remote zones will cause a measurable performance reduction. The
node unless explicitly overridden by memory policies or cpuset
configurations.
+It may be advisable to allow slab reclaim if the system makes heavy
+use of files and builds up large slab caches. However, the slab
+shrink operation is global, may take a long time and free slabs
+in all nodes of the system.
+
================================================================
zone_reclaim_interval:
#define RECLAIM_ZONE (1<<0) /* Run shrink_cache on the zone */
#define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
#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
} while (sc.nr_reclaimed < nr_pages && sc.priority > 0);
+ if (sc.nr_reclaimed < nr_pages && (zone_reclaim_mode & RECLAIM_SLAB)) {
+ /*
+ * shrink_slab does not currently allow us to determine
+ * how many pages were freed in the zone. So we just
+ * shake the slab and then go offnode for a single allocation.
+ *
+ * shrink_slab will free memory on all zones and may take
+ * a long time.
+ */
+ shrink_slab(sc.nr_scanned, gfp_mask, order);
+ sc.nr_reclaimed = 1; /* Avoid getting the off node timeout */
+ }
+
p->reclaim_state = NULL;
current->flags &= ~PF_MEMALLOC;