oom killer rewrite

This patchset is a rewrite of the out of memory killer to address several
issues that have been raised recently.  The most notable change is a
complete rewrite of the badness heuristic that determines which task is
killed; the goal was to make it as simple and predictable as possible
while still addressing issues that plague the VM.

Changes from version 2:

 - updated to 2.6.33, no longer based on mmotm

 - removed "oom: remove compulsory panic_on_oom mode"

 - mempolicy detachment is now protected by task_lock(); otherwise, it is
   possible for a mempolicy to be freed out from under code that is using
   it.  This isn't necessary for current->mempolicy, but all other tasks
   require it.

 - tasks that have mempolicies of MPOL_PREFERED (or MPOL_F_LOCAL) are now
   always considered for oom kill when it is mempolicy constrained since
   they may allocate elsewhere as fallback when their preferred (or local)
   node is oom.

 - lowmem allocations that are __GFP_NOFAIL are now retried in the page
   allocator instead of returning NULL.

 - added: [patch 4/10] oom: remove special handling for pagefault ooms

 - added: [patch 10/10] oom: default to killing current for pagefault ooms

This patchset has two dependencies from the -mm tree:

	[patch 5/10] oom: badness heuristic rewrite:
		mm-count-swap-usage.patch

	[patch 7/10] oom: replace sysctls with quick mode:
		sysctl-clean-up-vm-related-variable-delcarations.patch

To apply to mainline, download 2.6.33 and apply

	mm-clean-up-mm_counter.patch
	mm-avoid-false-sharing-of-mm_counter.patch
	mm-avoid-false-sharing-of-mm_counter-checkpatch-fixes.patch
	mm-count-swap-usage.patch
	mm-count-swap-usage-checkpatch-fixes.patch
	mm-introduce-dump_page-and-print-symbolic-flag-names.patch
	sysctl-clean-up-vm-related-variable-declarations.patch
	sysctl-clean-up-vm-related-variable-declarations-fix.patch

from http://userweb.kernel.org/~akpm/mmotm/broken-out.tar.gz first.

This patchset is also available for each kernel release from:

	http://www.kernel.org/pub/linux/kernel/people/rientjes/oo...

including broken out patches and the prerequisite patches listed above.
---
 Documentation/feature-removal-schedule.txt |   30 +
 Documentation/filesystems/proc.txt         |  100 +++--
 Documentation/sysctl/vm.txt                |   51 +-
 fs/proc/base.c                             |  106 +++++
 include/linux/memcontrol.h                 |   14 
 include/linux/mempolicy.h                  |   13 
 include/linux/oom.h                        |   24 +
 include/linux/sched.h                      |    3 
 kernel/exit.c                              |    8 
 kernel/fork.c                              |    1 
 kernel/sysctl.c                            |   15 
 mm/memcontrol.c                            |   43 --
 mm/mempolicy.c                             |   44 ++
 mm/oom_kill.c                              |  572 +++++++++++++++--------------
 mm/page_alloc.c                            |   29 +
 15 files changed, 653 insertions(+), 400 deletions(-)

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