[PATCH] slab memory shrinking balancing fix
The logic in shrink_slab tries to balance the proportion of slab which it scans against the proportion of pagecache which the caller scanned. Problem is that with a large number of highmem LRU pages and a small number of lowmem LRU pages, the amount of pagecache scanning appears to be very small, so we don't push slab hard enough. The patch changes things so that for, say, a GFP_KERNEL allocation attempt we only consider ZONE_NORMAL and ZONE_DMA when calculating "what proportion of the LRU did the caller just scan". This will have the effect of shrinking slab harder in response to GFP_KERNEL allocations than for GFP_HIGHMEM allocations. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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