On Thu, Apr 05, 2012 at 06:32:13PM +0200, Bartlomiej Zolnierkiewicz wrote: > Allow lower order buddy pages in suitable_migration_target() > so isolate_freepages() can isolate them as free pages during > compaction_alloc() phase. > > Cc: Mel Gorman <mgorman@xxxxxxx> > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Nak. This patch depends on patch 1 to scan every page in isolate_freepages() and I explained why that is a problem already. That aside, a side-effect of this is that movable pages can get migrated to MIGRATE_UNMOVABLE and MIGRATE_RECLAIMABLE pageblocks. This will have a negative impact on fragmentation avoidance. In your particular use-case it will slightly increase allocation success rates early in the lifetime of the system at the cost of degrading success rates later. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>