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    SubjectRe: [PATCH] switch free memory back to MIGRATE_MOVABLE
    On Mon, 13 Jul 2009 11:04:44 +0800
    Shaohua Li <shaohua.li@intel.com> wrote:

    > On Mon, Jul 13, 2009 at 10:58:03AM +0800, KAMEZAWA Hiroyuki wrote:
    > > On Mon, 13 Jul 2009 11:47:46 +0900 (JST)
    > > KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 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 <shaohua.li@intel.com>
    > > >
    > > > 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 ?
    > The page is initialized as migrate_movable, and then switch to reclaimable or
    > something else when fallback occurs, but its type remains even the page gets
    > freed. When the page gets freed, its type actually can be switch back to movable,
    > this is what the patch does.
    >
    Then, what is the benefits ? Changing this Movable here is better than fallback and
    find this chunk again in lazy way ?

    Thanks,
    -Kame




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