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[PATCH v2 00/17] mm/slab: introduce new freed objects management way, OBJFREELIST_SLAB

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From: Joonsoo Kim <iamjoonsoo.kim@lge.com>

This submission is just intended to get more review if possible.
This patchset is already on mmotm for a month and there is
no problem at all. No changes from mmotm one.

Changes from v1:
o Fold fixes into corresponding ones (no difference from mmotm)
o Add a clean-up patch at last per Christoph's comment

Hello,

This patchset implements new freed object management way, that is,
OBJFREELIST_SLAB. Purpose of it is to reduce memory overhead in SLAB.

SLAB needs a array to manage freed objects in a slab. If there is
leftover after objects are packed into a slab, we can use it as
a management array, and, in this case, there is no memory waste.
But, in the other cases, we need to allocate extra memory for
a management array or utilize dedicated internal memory in a slab for it.
Both cases causes memory waste so it's not good.

With this patchset, freed object itself can be used for a management
array. So, memory waste could be reduced. Detailed idea and numbers
are described in last patch's commit description. Please refer it.

Thanks.

Joonsoo Kim (17):
  mm/slab: fix stale code comment
  mm/slab: remove useless structure define
  mm/slab: remove the checks for slab implementation bug
  mm/slab: activate debug_pagealloc in SLAB when it is actually enabled
  mm/slab: use more appropriate condition check for debug_pagealloc
  mm/slab: clean up DEBUG_PAGEALLOC processing code
  mm/slab: alternative implementation for DEBUG_SLAB_LEAK
  mm/slab: remove object status buffer for DEBUG_SLAB_LEAK
  mm/slab: put the freelist at the end of slab page
  mm/slab: align cache size first before determination of OFF_SLAB
    candidate
  mm/slab: clean up cache type determination
  mm/slab: do not change cache size if debug pagealloc isn't possible
  mm/slab: make criteria for off slab determination robust and simple
  mm/slab: factor out slab list fixup code
  mm/slab: factor out debugging initialization in cache_init_objs()
  mm/slab: introduce new slab management type, OBJFREELIST_SLAB
  mm/slab: avoid returning values by reference

 include/linux/mm.h       |  12 +-
 include/linux/slab_def.h |   3 +
 mm/slab.c                | 626 ++++++++++++++++++++++++++---------------------
 3 files changed, 362 insertions(+), 279 deletions(-)

-- 
1.9.1

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[PATCH v2 00/17] mm/slab: introduce new freed objects management way, OBJFREELIST_SLAB js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 16/17] mm/slab: introduce new slab management type, OBJFREELIST_SLAB js1304@gmail.com - 2016-02-26 07:10 +0100
    Re: [PATCH v2 16/17] mm/slab: introduce new slab management type,  OBJFREELIST_SLAB Christoph Lameter <cl@linux.com> - 2016-02-26 17:30 +0100
      Re: [PATCH v2 16/17] mm/slab: introduce new slab management type, OBJFREELIST_SLAB Joonsoo Kim <js1304@gmail.com> - 2016-02-26 18:10 +0100
  [PATCH v2 11/17] mm/slab: clean up cache type determination js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 03/17] mm/slab: remove the checks for slab implementation bug js1304@gmail.com - 2016-02-26 07:10 +0100
    Re: [PATCH v2 03/17] mm/slab: remove the checks for slab implementation  bug Christoph Lameter <cl@linux.com> - 2016-02-26 17:10 +0100
  [PATCH v2 01/17] mm/slab: fix stale code comment js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 04/17] mm/slab: activate debug_pagealloc in SLAB when it is actually enabled js1304@gmail.com - 2016-02-26 07:10 +0100
    Re: [PATCH v2 04/17] mm/slab: activate debug_pagealloc in SLAB when  it is actually enabled Christoph Lameter <cl@linux.com> - 2016-02-26 17:10 +0100
  [PATCH v2 05/17] mm/slab: use more appropriate condition check for debug_pagealloc js1304@gmail.com - 2016-02-26 07:10 +0100
    Re: [PATCH v2 05/17] mm/slab: use more appropriate condition check  for debug_pagealloc Christoph Lameter <cl@linux.com> - 2016-02-26 17:10 +0100
  [PATCH v2 09/17] mm/slab: put the freelist at the end of slab page js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 07/17] mm/slab: alternative implementation for DEBUG_SLAB_LEAK js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 13/17] mm/slab: make criteria for off slab determination robust and simple js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 12/17] mm/slab: do not change cache size if debug pagealloc isn't possible js1304@gmail.com - 2016-02-26 07:10 +0100
    Re: [PATCH v2 12/17] mm/slab: do not change cache size if debug  pagealloc isn't possible Christoph Lameter <cl@linux.com> - 2016-02-26 17:20 +0100
      Re: [PATCH v2 12/17] mm/slab: do not change cache size if debug  pagealloc isn't possible Joonsoo Kim <js1304@gmail.com> - 2016-02-26 18:10 +0100
  [PATCH v2 17/17] mm/slab: avoid returning values by reference js1304@gmail.com - 2016-02-26 07:10 +0100
    Re: [PATCH v2 17/17] mm/slab: avoid returning values by reference Christoph Lameter <cl@linux.com> - 2016-02-26 17:30 +0100
  [PATCH v2 06/17] mm/slab: clean up DEBUG_PAGEALLOC processing code js1304@gmail.com - 2016-02-26 07:10 +0100
  [PATCH v2 08/17] mm/slab: remove object status buffer for DEBUG_SLAB_LEAK js1304@gmail.com - 2016-02-26 07:10 +0100

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