| Date | Wed, 24 Mar 2010 10:47:41 +0900 | Subject | Re: [PATCH 07/11] Memory compaction core | From | Minchan Kim <> |
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On Wed, Mar 24, 2010 at 10:03 AM, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: > On Tue, 23 Mar 2010 12:25:42 +0000 > Mel Gorman <mel@csn.ul.ie> wrote: > >> This patch is the core of a mechanism which compacts memory in a zone by >> relocating movable pages towards the end of the zone. >> >> A single compaction run involves a migration scanner and a free scanner. >> Both scanners operate on pageblock-sized areas in the zone. The migration >> scanner starts at the bottom of the zone and searches for all movable pages >> within each area, isolating them onto a private list called migratelist. >> The free scanner starts at the top of the zone and searches for suitable >> areas and consumes the free pages within making them available for the >> migration scanner. The pages isolated for migration are then migrated to >> the newly isolated free pages. >> >> Signed-off-by: Mel Gorman <mel@csn.ul.ie> >> Acked-by: Rik van Riel <riel@redhat.com> >> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> > > I think lru_add_drain() or lru_add_drain_all() should be called somewhere > when we do __isolate_lru_page(). But it's (_all is) slow.... >
migrate_prep does it.
-- Kind regards, Minchan Kim
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