[PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B

[Vladimir Davydov <vdavydov@parallels.com>]

Hi,

SLAB and SLUB use hardwall cpuset check on fallback alloc, while the
page allocator uses softwall check for all kernel allocations. This may
result in falling into the page allocator even if there are free objects
on other nodes. SLAB algorithm is especially affected: the number of
objects allocated in vain is unlimited, so that they theoretically can
eat up a whole NUMA node. For more details see comments to patches 3, 4.

When I last sent a fix (https://lkml.org/lkml/2014/8/10/100), David
found the whole cpuset API being cumbersome and proposed to simplify it
before getting to fixing its users. So this patch set addresses both
David's complain (patches 1, 2) and the SL[AU]B issues (patches 3, 4).

Reviews are appreciated.

Thanks,

Vladimir Davydov (4):
  cpuset: convert callback_mutex to a spinlock
  cpuset: simplify cpuset_node_allowed API
  slab: fix cpuset check in fallback_alloc
  slub: fix cpuset check in get_any_partial

 include/linux/cpuset.h |   37 +++--------
 kernel/cpuset.c        |  162 +++++++++++++++++-------------------------------
 mm/hugetlb.c           |    2 +-
 mm/oom_kill.c          |    2 +-
 mm/page_alloc.c        |    6 +-
 mm/slab.c              |    2 +-
 mm/slub.c              |    2 +-
 mm/vmscan.c            |    5 +-
 8 files changed, 74 insertions(+), 144 deletions(-)

-- 
1.7.10.4

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