[RFC/PATCH 0/6] memcg: peformance improvement at el. v3

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>]

This set is for memory resource controller, reviewer and testers. 

Updated against 2.6.26-rc2 and added fixes.

This set does
 - remove refcnt from page_cgroup. By this, codes can be simplified and
   we can avoid tons of unnecessary calls just for maintain refcnt.
 - handle swap-cache, which is now ignored by memory resource controller.
 - small optimization.
 - make force_empty to drop pages. (NEW)
 
major changes : v2 -> v3
 - fixed shared memory handling.
 - added a call to request recalaim memory from specified memcg (NEW) for shmem.
 - added drop_all_pages_in_mem_cgroup before calling force_empty()
 - dropped 3 patches because it's already sent to -mm queue.

 1/6 -- make force_empty to drop pages. (NEW)
 2/6 -- remove refcnt from page_cgroup (shmem handling is fixed.)
 3/6 -- handle swap cache
 4/6 -- add an interface to reclaim memory from memcg (NEW) (for shmem)
 5/6 -- small optimzation with likely()/unlikely()
 6/6 -- remove redundant check.

If positive feedback, I'd like to send some of them agaisnt -mm queue.

This is based on
  - 2.6.26-rc2 
  - memcg-avoid-unnecessary-initialization.patch (in -mm queue)
  - memcg-make-global-var-read_mostly.patch (in -mm queue)
  - memcg-better-migration-handling.patch (in -mm queue)
tested on x86-64 box. Seems to work very well.

Any comments are welcome.

Thanks,
-Kame

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