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

[Christoph Lameter <cl@linux-foundation.org>]

On Tue, 24 Mar 2009, KOSAKI Motohiro wrote:

> 2009/3/23 Christoph Lameter <cl@linux-foundation.org>:
> > 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.
>
> Do you mean nak or comment adding request?
> I agree you. but I don't find any weak point of this patch.

Just a comment.

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