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SubjectRe: [PATCH 3/4] mm: vmscan: Evaluate the watermarks against the correct classzone
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: Pádraig Brady<>
> Signed-off-by: Mel Gorman<>

Acked-by: Rik van Riel <>

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