Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux

Pull slab update from Pekka Enberg:
 "Highlights:

  - Fix for boot-time problems on some architectures due to
    init_lock_keys() not respecting kmalloc_caches boundaries
    (Christoph Lameter)

  - CONFIG_SLUB_CPU_PARTIAL requested by RT folks (Joonsoo Kim)

  - Fix for excessive slab freelist draining (Wanpeng Li)

  - SLUB and SLOB cleanups and fixes (various people)"

I ended up editing the branch, and this avoids two commits at the end
that were immediately reverted, and I instead just applied the oneliner
fix in between myself.

* 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
  slub: Check for page NULL before doing the node_match check
  mm/slab: Give s_next and s_stop slab-specific names
  slob: Check for NULL pointer before calling ctor()
  slub: Make cpu partial slab support configurable
  slab: add kmalloc() to kernel API documentation
  slab: fix init_lock_keys
  slob: use DIV_ROUND_UP where possible
  slub: do not put a slab to cpu partial list when cpu_partial is 0
  mm/slub: Use node_nr_slabs and node_nr_objs in get_slabinfo
  mm/slub: Drop unnecessary nr_partials
  mm/slab: Fix /proc/slabinfo unwriteable for slab
  mm/slab: Sharing s_next and s_stop between slab and slub
  mm/slab: Fix drain freelist excessively
  slob: Rework #ifdeffery in slab.h
  mm, slab: moved kmem_cache_alloc_node comment to correct place

1 files changed, 11 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 54d3fa5ae723..247084be0590 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1596,6 +1596,17 @@ config SLOB
 
 endchoice
 
+config SLUB_CPU_PARTIAL
+        default y
+        depends on SLUB
+        bool "SLUB per cpu partial cache"
+        help
+          Per cpu partial caches accellerate objects allocation and freeing
+          that is local to a processor at the price of more indeterminism
+          in the latency of the free. On overflow these caches will be cleared
+          which requires the taking of locks that may cause latency spikes.
+          Typically one would choose no for a realtime system.
+
 config MMAP_ALLOW_UNINITIALIZED
         bool "Allow mmapped anonymous memory to be uninitialized"
         depends on EXPERT && !MMU