[v2,0/5] ] mm: Use slab_list list_head instead of lru

Message

Tobin C. Harding March 13, 2019, 5:20 a.m. UTC

Currently the slab allocators (ab)use the struct page 'lru' list_head.
We have a list head for slab allocators to use, 'slab_list'.

Clean up all three allocators by using the 'slab_list' list_head instead
of overloading the 'lru' list_head.

Patch 1 -  Makes no code changes, adds comments to #endif statements.

Patches 2,3,4 - Do changes as a patch per allocator, tested by building
                and booting (in Qemu) after configuring kernel to use
                appropriate allocator.  Also build and boot with debug
                options enabled (for slab and slub).  Verify the object
                files (before and after the set applied) are the same.

Patch 5 - Removes the now stale comment in the page struct definition.

Changes since v1:

 - Verify object files are the same before and after the patch set is
   applied (suggested by Matthew).
 - Add extra explanation to the commit logs explaining why these changes
   are safe to make (suggested by Roman).
 - Remove stale comment (thanks Willy).


thanks,
Tobin.


Tobin C. Harding (5):
  slub: Add comments to endif pre-processor macros
  slub: Use slab_list instead of lru
  slab: Use slab_list instead of lru
  slob: Use slab_list instead of lru
  mm: Remove stale comment from page struct

 include/linux/mm_types.h |  2 +-
 mm/slab.c                | 49 ++++++++++++++++----------------
 mm/slob.c                | 10 +++----
 mm/slub.c                | 60 ++++++++++++++++++++--------------------
 4 files changed, 61 insertions(+), 60 deletions(-)