[RFC,v1,00/15] common kmalloc subsystem on SLAB/SLUB

Message

Harry (Hyeonggon) Yoo March 8, 2022, 11:41 a.m. UTC

Hello, this series is cleanup of slab common code.

After this series, kmalloc subsystem is perfectly generalized
between SLAB and SLUB.

This series is not small, and some of review and discussion may be needed.
But I bet you will like this! :D

Many thanks to Matthew, Marco, Vlastimil who gave comments
in previous series.

Any feedbacks will be appreciated.
Thanks!

========= series description ==========

patch 1 makes slab_alloc_node() in SLAB available for non-NUMA
configurations for further cleanup.

patch 2-8 are cleanup of unnecessary CONFIG_TRACING/NUMA ifdefs and
duplicate code. (and small optimization of kmalloc_node())

patch 9 makes SLAB pass requests larger than order-1 page to page
allocator. This is useful for further generalization.

patch 10-11 are cleanup of tracepoints. Currently there are five
trace points in slab: kmalloc, kmalloc_node, kmem_cache_alloc,
kmem_cahce_alloc_node, kmem_cache_free, kfree.

patch 10-11 make tracepoints print cache name and convert every
tracepoint to kmem_cache_alloc_node and kmem_cache_free.

patch 12 generalizes whole kmalloc subsystem on SLAB and SLUB.

patch 13 removes kmem_cache_alloc_node() that became useless
after patch 12.

patch 14-15 are small improvements of __ksize().

Hyeonggon Yoo (15):
  mm/slab: cleanup slab_alloc() and slab_alloc_node()
  mm/sl[auo]b: remove CONFIG_NUMA ifdefs for common functions
  mm/sl[au]b: remove CONFIG_TRACING ifdefs for tracing functions
  mm/sl[auo]b: fold kmalloc_order() into kmalloc_large()
  mm/slub: move kmalloc_large_node() to slab_common.c
  mm/slab_common: cleanup kmalloc_large()
  mm/sl[au]b: kmalloc_node: pass large requests to page allocator
  mm/sl[auo]b: cleanup kmalloc()
  mm/slab: kmalloc: pass requests larger than order-1 page to page
    allocator
  mm/sl[auo]b: print cache name in tracepoints
  mm/sl[auo]b: use same tracepoint in kmalloc and normal caches
  mm/sl[au]b: generalize kmalloc subsystem
  mm/sl[au]b: remove kmem_cache_alloc_node_trace()
  mm/sl[auo]b: move definition of __ksize() to mm/slab.h
  mm/sl[au]b: check if large object is valid in __ksize()

 include/linux/slab.h        | 252 +++++++++++---------------
 include/trace/events/kmem.h | 107 ++---------
 mm/slab.c                   | 347 ++++++++----------------------------
 mm/slab.h                   |   9 +
 mm/slab_common.c            | 128 ++++++++++---
 mm/slob.c                   |  69 +++----
 mm/slub.c                   | 237 ++----------------------
 7 files changed, 346 insertions(+), 803 deletions(-)