Re: [PATCH] fix vmscan to take care of nodemask

[Christoph Lameter]

On Mon, 23 Mar 2009, Mel Gorman wrote:

> try_to_free_pages() is used for the direct reclaim of up to
> SWAP_CLUSTER_MAX pages when watermarks are low. The caller to
> alloc_pages_nodemask() can specify a nodemask of nodes that are allowed
> to be used but this is not passed to try_to_free_pages(). This can lead
> to the unnecessary reclaim of pages that are unusable by the caller and
> in the worst case lead to allocation failure as progress was not been
> made where it is needed.
>
> This patch passes the nodemask used for alloc_pages_nodemask() to
> try_to_free_pages().


This is only useful for MPOL_BIND. Direct reclaim within a cpuset already
honors the boundaries of the cpuset.

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