[PATCH v2 0/3] mm/slub: Fix count_partial() problem

[Xunlei Pang <xlpang@linux.alibaba.com>]

v1->v2:
- Improved changelog and variable naming for PATCH 1~2.
- PATCH3 adds per-cpu counter to avoid performance regression
  in concurrent __slab_free().

[Testing]
On my 32-cpu 2-socket physical machine:
Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz
perf stat --null --repeat 10 -- hackbench 20 thread 20000

== original, no patched
      19.211637055 seconds time elapsed                                          ( +-  0.57% )

== patched with patch1~2
 Performance counter stats for 'hackbench 20 thread 20000' (10 runs):

      21.731833146 seconds time elapsed                                          ( +-  0.17% )

== patched with patch1~3
 Performance counter stats for 'hackbench 20 thread 20000' (10 runs):

      19.112106847 seconds time elapsed                                          ( +-  0.64% )


Xunlei Pang (3):
  mm/slub: Introduce two counters for partial objects
  mm/slub: Get rid of count_partial()
  mm/slub: Use percpu partial free counter

 mm/slab.h |   2 +
 mm/slub.c | 124 +++++++++++++++++++++++++++++++++++++++++++-------------------
 2 files changed, 89 insertions(+), 37 deletions(-)

-- 
1.8.3.1