We already do slab reclaim during page reclaim. Add a call to
object expiration in slub whenever shrink_slab() is called.
If the reclaim is zone specific then use the node of the zone
to restrict reclaim in slub.

Signed-off-by: Christoph Lameter <cl@linux.com>


---
 mm/vmscan.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c	2010-07-30 18:37:47.638837043 -0500
+++ linux-2.6/mm/vmscan.c	2010-07-30 18:57:44.867515416 -0500
@@ -1826,6 +1826,7 @@
 				sc->nr_reclaimed += reclaim_state->reclaimed_slab;
 				reclaim_state->reclaimed_slab = 0;
 			}
+			kmem_cache_expire_all(NUMA_NO_NODE);
 		}
 		total_scanned += sc->nr_scanned;
 		if (sc->nr_reclaimed >= sc->nr_to_reclaim)
@@ -2133,6 +2134,7 @@
 			reclaim_state->reclaimed_slab = 0;
 			nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
 						lru_pages);
+			kmem_cache_expire_all(nid);
 			sc.nr_reclaimed += reclaim_state->reclaimed_slab;
 			total_scanned += sc.nr_scanned;
 			if (zone->all_unreclaimable)
@@ -2640,6 +2642,8 @@
 		 */
 		sc.nr_reclaimed += slab_reclaimable -
 			zone_page_state(zone, NR_SLAB_RECLAIMABLE);
+
+		kmem_cache_expire_all(zone_to_nid(zone));
 	}
 
 	p->reclaim_state = NULL;

--
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