[PATCH v6 0/3] mm, slab: Make kmalloc_info[] contain all types of names

[Pengfei Li <lpf.vector@gmail.com>]

Changes in v6
--
1. abandon patch 4-7 (Because there is not enough reason to explain
that they are beneficial)

Changes in v5
--
1. patch 1/7:
    - rename SET_KMALLOC_SIZE to INIT_KMALLOC_INFO
2. patch 5/7:
    - fix build errors (Reported-by: kbuild test robot)
    - make all_kmalloc_info[] static (Reported-by: kbuild test robot)
3. patch 6/7:
    - for robustness, determine kmalloc_cache is !NULL in
      new_kmalloc_cache()
4. add ack tag from David Rientjes

Changes in v4
--
1. [old] abandon patch 4/4
2. [new] patch 4/7:
    - return ZERO_SIZE_ALLOC instead 0 for zero sized requests
3. [new] patch 5/7:
    - reorder kmalloc_info[], kmalloc_caches[] (in order of size)
    - hard to split, so slightly larger
4. [new] patch 6/7:
    - initialize kmalloc_cache[] with the same size but different
      types
5. [new] patch 7/7:
    - modify kmalloc_caches[type][idx] to kmalloc_caches[idx][type]

Patch 4-7 are newly added, more information can be obtained from
commit messages.

Changes in v3
--
1. restore __initconst (patch 1/4)
2. rename patch 3/4
3. add more clarification for patch 4/4
4. add ack tag from Roman Gushchin

Changes in v2
--
1. remove __initconst (patch 1/5)
2. squash patch 2/5
3. add ack tag from Vlastimil Babka


There are three types of kmalloc, KMALLOC_NORMAL, KMALLOC_RECLAIM
and KMALLOC_DMA.

The name of KMALLOC_NORMAL is contained in kmalloc_info[].name,
but the names of KMALLOC_RECLAIM and KMALLOC_DMA are dynamically
generated by kmalloc_cache_name().

Patch1 predefines the names of all types of kmalloc to save
the time spent dynamically generating names.

These changes make sense, and the time spent by new_kmalloc_cache()
has been reduced by approximately 36.3%.

                         Time spent by new_kmalloc_cache()
                                  (CPU cycles)
5.3-rc7                              66264
5.3-rc7+patch                        42188

Pengfei Li (3):
  mm, slab: Make kmalloc_info[] contain all types of names
  mm, slab: Remove unused kmalloc_size()
  mm, slab_common: Use enum kmalloc_cache_type to iterate over kmalloc
    caches

 include/linux/slab.h | 20 -----------
 mm/slab.c            |  7 ++--
 mm/slab.h            |  2 +-
 mm/slab_common.c     | 99 ++++++++++++++++++++++++++++------------------------
 4 files changed, 58 insertions(+), 70 deletions(-)

-- 
2.7.4