606cf282f88cd6598de22190eff6708affa parent 39c715b71740c4a78ba4769fb54826929bac03cb author akpm@osdl.org 1119399275 -0700 committer Linus Torvalds 1119404773 -0700 [PATCH] vmscan: notice slab shrinking Fix a problem identified by Andrea Arcangeli kswapd will set a zone into all_unreclaimable state if it sees that we're not successfully reclaiming LRU pages. But that fails to notice that we're successfully reclaiming slab obects, so we can set all_unreclaimable too soon. So change shrink_slab() to return a success indication if it actually reclaimed some objects, and don't assume that the zone is all_unreclaimable if that is true. This means that we won't enter all_unreclaimable state if we are successfully freeing slab objects but we're not yet actually freeing slab pages, due to internal fragmentation. (hm, this has a shortcoming. We could be successfully freeing ZONE_NORMAL slab objects while being really oom on ZONE_DMA. If that happens then kswapd might burn a lot of CPU. But given that there might be some slab objects in ZONE_DMA, perhaps that is appropriate.) Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds blx