Messages in this thread | | | Date | Mon, 16 May 2011 14:10:24 -0700 (PDT) | From | David Rientjes <> | Subject | Re: [PATCH 2/4] mm: slub: Do not wake kswapd for SLUBs speculative high-order allocations |
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On Fri, 13 May 2011, Mel Gorman wrote:
> To avoid locking and per-cpu overhead, SLUB optimisically uses > high-order allocations and falls back to lower allocations if they > fail. However, by simply trying to allocate, kswapd is woken up to > start reclaiming at that order. On a desktop system, two users report > that the system is getting locked up with kswapd using large amounts > of CPU. Using SLAB instead of SLUB made this problem go away. > > This patch prevents kswapd being woken up for high-order allocations. > Testing indicated that with this patch applied, the system was much > harder to hang and even when it did, it eventually recovered. > > Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
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