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SubjectRe: [PATCH] switch free memory back to MIGRATE_MOVABLE
On Mon, 13 Jul 2009 11:47:46 +0900 (JST)
KOSAKI Motohiro <> wrote:

> > When page is back to buddy and its order is bigger than pageblock_order, we can
> > switch its type to MIGRATE_MOVABLE. This can reduce fragmentation. The patch
> > has obvious effect when read a block device and then drop caches.
> >
> > Signed-off-by: Shaohua Li <>
> This patch change hot path, but there is no performance mesurement description.
> Also, I don't like modification buddy core for only drop caches.
Li, does this patch imply fallback of migration type doesn't work well ?
What is the bad case ?


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