Memcg Kernel Memory Tracking.

This is v2 of my kernel memory tracking patchset for memcg.

Lots of changes based on feedback from Glauber and Kamezawa.
In particular, I changed it to be opt-in instead of opt-out:
In order for a slab type to be tracked, it has to be marked with
SLAB_MEMCG_ACCT at kmem_cache_create() time.
Currently, only dentries and kmalloc are tracked.

Planned for v3:
 - Slub support.
 - Using a static_branch to remove overhead when no cgroups have been
   created.
 - Getting rid of kmem_cache_get_ref/drop_ref pair in kmem_cache_free.

Detailed change list from v1 (http://marc.info/?l=linux-mm&m=133038361014525):
 - Fixed misspelling in documentation.
 - Added flags field to struct mem_cgroup.
 - Moved independent_kmem_limit into flags.
 - Renamed kmem_bytes to kmem.
 - Divided consume_stock changes into two changes.
 - Fixed crash at boot when not every commit is applied.
 - Moved the new fields in kmem_cache into their own struct.
 - Got rid of SLAB_MEMCG slab flag.
 - Dropped accounting to root.
 - Added css_id into memcg slab name.
 - Changed memcg cache creation to always be deferred to workqueue.
 - Replaced bypass_bytes with overcharging the cgroup.
 - Got rid of #ifdef CONFIG_SLAB from memcontrol.c.
 - Got rid of __GFP_NOACCOUNT, changing to an opt-in model.
 - Remove kmem limit when turning off independent limit.
 - Moved the accounting of kmalloc to its own patch.
 - Removed useless parameters from memcg_create_kmem_cache().
 - Get a ref to the css when enqueing cache for creation.
 - increased MAX_KMEM_CACHE_TYPES to 400.

Suleiman Souhlal (13):
  memcg: Consolidate various flags into a single flags field.
  memcg: Kernel memory accounting infrastructure.
  memcg: Uncharge all kmem when deleting a cgroup.
  memcg: Make it possible to use the stock for more than one page.
  memcg: Reclaim when more than one page needed.
  slab: Add kmem_cache_gfp_flags() helper function.
  memcg: Slab accounting.
  memcg: Make dentry slab memory accounted in kernel memory accounting.
  memcg: Account for kmalloc in kernel memory accounting.
  memcg: Track all the memcg children of a kmem_cache.
  memcg: Handle bypassed kernel memory charges.
  memcg: Per-memcg memory.kmem.slabinfo file.
  memcg: Document kernel memory accounting.

 Documentation/cgroups/memory.txt |   44 +++-
 fs/dcache.c                      |    4 +-
 include/linux/memcontrol.h       |   30 ++-
 include/linux/slab.h             |   56 ++++
 include/linux/slab_def.h         |   79 +++++-
 include/linux/slob_def.h         |    6 +
 include/linux/slub_def.h         |    9 +
 init/Kconfig                     |    2 +-
 mm/memcontrol.c                  |  633 ++++++++++++++++++++++++++++++++++---
 mm/slab.c                        |  431 +++++++++++++++++++++++---
 10 files changed, 1183 insertions(+), 111 deletions(-)

-- Suleiman

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