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memory unplug: page offline

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Logic.
 - set all pages in  [start,end)  as isolated migration-type.
   by this, all free pages in the range will be not-for-use.
 - Migrate all LRU pages in the range.
 - Test all pages in the range's refcnt is zero or not.

Todo:
 - allocate migration destination page from better area.
 - confirm page_count(page)== 0 && PageReserved(page) page is safe to be freed..
 (I don't like this kind of page but..
 - Find out pages which cannot be migrated.
 - more running tests.
 - Use reclaim for unplugging other memory type area.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Yasunori Goto <y-goto@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 01:26:12 -07:00 • committed by Linus Torvalds
parent a5d76b54a3
commit 0c0e619589
6 changed files with 314 additions and 1 deletions
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5
include/linux/memory_hotplug.h
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@ -58,7 +58,10 @@ extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
extern void online_page(struct page *page);
/* VM interface that may be used by firmware interface */
extern int online_pages(unsigned long, unsigned long);
#ifdef CONFIG_MEMORY_HOTREMOVE
extern int offline_pages(unsigned long, unsigned long, unsigned long);
extern void __offline_isolated_pages(unsigned long, unsigned long);
#endif
/* reasonably generic interface to expand the physical pages in a zone */
extern int __add_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);