tree 2b35d3b81ba54b5d38e691d2a2019f4bcdfd1dce
parent a5d76b54a3f3a40385d7f76069a2feac9f1bad63
author KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 1192523172 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1192552982 -0700

memory unplug: page offline

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>