[RFC][PATCH 0/11] memcg updates / clean up, lazy lru ,mem+swap controller

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Just for internal review. Now, it's under merge window ;)

This is mem cgroup next update (in my queue.)
I'm now testing this set and would like to post next week, one by one.
(Anyway, I'll wait until mmotm/mainline seems to be setteled.)

These are against "The mm-of-the-moment snapshot 2008-10-22-17-18"

Includes 1 clean up and 4 major changes.

  a. menuconfig cleanup
     Now, "General Setup" in menuconfig is getting longer day by day...
     add cgroup submenu for good look.

  b. try/commit/cancel protocol.
     make mem_cgroup interface to be more specific and add new interface to
     try/commit/cancel.
     Because we allocates all page_cgroup at boot, we can do better handling
     of charge/uncharge calls.

  c. change force_empty's behavior from forgetting all to move to parent.
     Now, force_empty does "forget all". This is not good. 
     Change this behavior to
        - move account to the parent.
        - if the parent hits limit, free pages.
     and this remove memory.force_empty interface....a debug only brutal file.
     (This file can be a hole....)
  d. lazy lru handling.
     do add/remove to memcg's LRU in lazy way as pagevec does.

  e. Mem+Swap controller.
     account swap and limit by mem+swap. this feature is implemented as a
     extension to memcg. (mem_counter is removed.)

In my view,
   a. is ok. (patch 1,2)
   b,c,d have been tested for 2-3 weeks unchaged.. (patch 3-7)
   e. is very new and will be in my queue for more weeks. (patch8-11)


Patches.
 [1/11] fix menu's comment about page_cgroup overhead.
 [2/11] make cgroup's manuconfig as sub menu
 [3/11] introduce charge/commit/cancel
 [4/11] clean up page migration (again!)
 [5/11] fix force_empty to move account to parent
 [6/11] lazy memcg lru removal
 [7/11] lazy memcg lru add
 [8/11] make shmem's accounting clealer before mem+swap controller
 [9/11] mem+swap controller kconfig.
 [10/11] swap_cgroup for recording swap information
 [11/11] mem+swap controller core

Thank you for all your patient helps.

Regards,
-Kame


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