linux-kernel - [PATCH v2 0/3] mm/slub: some minor optimization and cleanup

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Message-Id: <20240117-slab-misc-v2-0-81766907896e@bytedance.com>
Date: Tue, 23 Jan 2024 09:33:28 +0000
From: Chengming Zhou <zhouchengming@...edance.com>
To: Joonsoo Kim <iamjoonsoo.kim@....com>, Vlastimil Babka <vbabka@...e.cz>, David Rientjes <rientjes@...gle.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>, Pekka Enberg <penberg@...nel.org>, Christoph Lameter <cl@...ux.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc: Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org, Chengming Zhou <zhouchengming@...edance.com>,
 linux-mm@...ck.org, "Christoph Lameter (Ampere)" <cl@...ux.com>
Subject: [PATCH v2 0/3] mm/slub: some minor optimization and cleanup

Changes in v2:
- Add VM_BUG_ON(!freelist) after get_freelist() for cpu partial slab case,
  since it's not possible to happen for this case.
- Collect tags.
- Link to v1: https://lore.kernel.org/r/20240117-slab-misc-v1-0-fd1c49ccbe70@bytedance.com

Hi,

This series include a minor optimization of cpu partial slab fastpath,
which directly load freelist from cpu partial slab in the likely case.

It has small performance improvement in testing:
perf bench sched messaging -g 5 -t -l 100000

            mm-stable   slub-optimize
Total time      7.473    7.209

The other two patches are cleanups, which are included for convenience.

Thanks for review and comment!

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
Chengming Zhou (3):
      mm/slub: directly load freelist from cpu partial slab in the likely case
      mm/slub: remove full list manipulation for non-debug slab
      mm/slub: remove unused parameter in next_freelist_entry()

 mm/slub.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)
---
base-commit: ab27740f76654ed58dd32ac0ba0031c18a6dea3b
change-id: 20240117-slab-misc-5a5f37a51257

Best regards,
-- 
Chengming Zhou <zhouchengming@...edance.com>