linux-toradex.git/include/linux/page-isolation.h, branch v3.7.3

mm/page_alloc: refactor out __alloc_contig_migrate_alloc()

2012-10-09T07:22:52+00:00

__alloc_contig_migrate_alloc() can be used by memory-hotplug so refactor
it out (move + rename as a common name) into page_isolation.c.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Minchan Kim 
Cc: Kamezawa Hiroyuki 
Reviewed-by: Yasuaki Ishimatsu 
Acked-by: Michal Nazarewicz 
Cc: Marek Szyprowski 
Cc: Wen Congyang 
Acked-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory-hotplug: fix pages missed by race rather than failing

2012-10-09T07:22:46+00:00

If race between allocation and isolation in memory-hotplug offline
happens, some pages could be in MIGRATE_MOVABLE of free_list although the
pageblock's migratetype of the page is MIGRATE_ISOLATE.

The race could be detected by get_freepage_migratetype in
__test_page_isolated_in_pageblock.  If it is detected, now EBUSY gets
bubbled all the way up and the hotplug operations fails.

But better idea is instead of returning and failing memory-hotremove, move
the free page to the correct list at the time it is detected.  It could
enhance memory-hotremove operation success ratio although the race is
really rare.

Suggested by Mel Gorman.

[akpm@linux-foundation.org: small cleanup]
Signed-off-by: Minchan Kim 
Cc: KAMEZAWA Hiroyuki 
Reviewed-by: Yasuaki Ishimatsu 
Acked-by: Mel Gorman 
Cc: Xishi Qiu 
Cc: Wen Congyang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: factor out memory isolate functions

2012-08-01T01:42:45+00:00

mm/page_alloc.c has some memory isolation functions but they are used only
when we enable CONFIG_{CMA|MEMORY_HOTPLUG|MEMORY_FAILURE}.  So let's make
it configurable by new CONFIG_MEMORY_ISOLATION so that it can reduce
binary size and we can check it simple by CONFIG_MEMORY_ISOLATION, not if
defined CONFIG_{CMA|MEMORY_HOTPLUG|MEMORY_FAILURE}.

Signed-off-by: Minchan Kim 
Cc: Andi Kleen 
Cc: Marek Szyprowski 
Acked-by: KAMEZAWA Hiroyuki 
Cc: KOSAKI Motohiro 
Cc: Mel Gorman 
Cc: Michal Hocko 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: page_isolation: MIGRATE_CMA isolation functions added

2012-05-21T13:09:33+00:00

This commit changes various functions that change pages and
pageblocks migrate type between MIGRATE_ISOLATE and
MIGRATE_MOVABLE in such a way as to allow to work with
MIGRATE_CMA migrate type.

Signed-off-by: Michal Nazarewicz 
Signed-off-by: Marek Szyprowski 
Reviewed-by: KAMEZAWA Hiroyuki 
Tested-by: Rob Clark 
Tested-by: Ohad Ben-Cohen 
Tested-by: Benjamin Gaignard 
Tested-by: Robert Nelson 
Tested-by: Barry Song

memory unplug: page isolation

2007-10-16T16:43:02+00:00

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