• KAMEZAWA Hiroyuki's avatar
    memory unplug: page isolation · a5d76b54
    KAMEZAWA Hiroyuki authored
    Implement generic chunk-of-pages isolation method by using page grouping ops.
    
    This patch add MIGRATE_ISOLATE to MIGRATE_TYPES. By this
     - MIGRATE_TYPES increases.
     - bitmap for migratetype is enlarged.
    
    pages of MIGRATE_ISOLATE migratetype will not be allocated even if it is free.
    By this, you can isolated *freed* pages from users. How-to-free pages is not
    a purpose of this patch. You may use reclaim and migrate codes to free pages.
    
    If start_isolate_page_range(start,end) is called,
     - migratetype of the range turns to be MIGRATE_ISOLATE  if
       its type is MIGRATE_MOVABLE. (*) this check can be updated if other
       memory reclaiming works make progress.
     - MIGRATE_ISOLATE is not on migratetype fallback list.
     - All free pages and will-be-freed pages are isolated.
    To check all pages in the range are isolated or not,  use test_pages_isolated(),
    To cancel isolation, use undo_isolate_page_range().
    
    Changes V6 -> V7
     - removed unnecessary #ifdef
    
    There are HOLES_IN_ZONE handling codes...I'm glad if we can remove them..
    Signed-off-by: default avatarYasunori Goto <y-goto@jp.fujitsu.com>
    Signed-off-by: default avatarKAMEZAWA 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>
    a5d76b54
page-isolation.h 1.03 KB