• Mel Gorman's avatar
    mm: compaction: memory compaction core · 748446bb
    Mel Gorman authored
    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.
    [aarcange@redhat.com: Fix unsafe optimisation]
    [mel@csn.ul.ie: do not schedule work on other CPUs for compaction]
    Signed-off-by: default avatarMel Gorman <mel@csn.ul.ie>
    Acked-by: default avatarRik van Riel <riel@redhat.com>
    Reviewed-by: default avatarMinchan Kim <minchan.kim@gmail.com>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Christoph Lameter <cl@linux-foundation.org>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Makefile 1.6 KB