On 06/24/2011 10:44 AM, Mel Gorman wrote:

When deciding if kswapd is sleeping prematurely, the classzone is
taken into account but this is different to what balance_pgdat() and
the allocator are doing. Specifically, the DMA zone will be checked
based on the classzone used when waking kswapd which could be for a
GFP_KERNEL or GFP_HIGHMEM request. The lowmem reserve limit kicks in,
the watermark is not met and kswapd thinks its sleeping prematurely
keeping kswapd awake in error.

Reported-and-tested-by: PA!draig Brady<redacted>
Signed-off-by: Mel Gorman<mgorman@suse.de>

Acked-by: Rik van Riel <redacted>

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