This patch set adds
 - force_empty interface, which drops all charges in memory cgroup.
   This enables rmdir() against unused memory cgroup.
 - the memory cgroup statistics accounting.

Based on 2.6.23-mm1 + http://lkml.org/lkml/2007/10/12/53

Changes from previous version is
 - merged comments.
 - based on 2.6.23-mm1
 - removed Charge/Uncharge counter.

[1/5] ... force_empty patch
[2/5] ... remember page is charged as page-cache patch
[3/5] ... remember page is on which list patch
[4/5] ... memory cgroup statistics patch
[5/5] ... show statistics patch

tested on x86-64/fake-NUMA + CONFIG_PREEMPT=y/n (for testing preempt_disable())

Any comments are welcome.

-Kame

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