memory unplug: page isolation

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 <y-goto@jp.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit is contained in:

KAMEZAWA Hiroyuki

2007-10-16 01:26:11 -07:00

committed by

Linus Torvalds

parent 75884fb1c6

commit a5d76b54a3

6 changed files with 223 additions and 3 deletions

									
										mm/Makefile
									
		+1
		-1
	
												View File
												
				@@ -11,7 +11,7 @@ obj-y			:= bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \

							   page_alloc.o page-writeback.o pdflush.o \

							   readahead.o swap.o truncate.o vmscan.o \

							   prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \

							   $(mmu-y)

							   page_isolation.o $(mmu-y)

				obj-$(CONFIG_BOUNCE)	+= bounce.o

				obj-$(CONFIG_SWAP)	+= page_io.o swap_state.o swapfile.o thrash.o