Eric Lee / smarc-fsl-linux-kernel

17 Oct, 2007

1 commit

  • a5d76b54a   memory unplug: page isolation ... Browse Code ยป

    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: Yasunori Goto
    Signed-off-by: KAMEZAWA Hiroyuki
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    KAMEZAWA Hiroyuki