linux-kernel - [PATCH v2 0/3] mm/slub: Fix count

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Date:   Mon, 10 Aug 2020 20:17:49 +0800
From:   Xunlei Pang <xlpang@...ux.alibaba.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Christoph Lameter <cl@...ux.com>,
        Wen Yang <wenyang@...ux.alibaba.com>,
        Roman Gushchin <guro@...com>, Pekka Enberg <penberg@...il.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        David Rientjes <rientjes@...gle.com>,
        Xunlei Pang <xlpang@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: [PATCH v2 0/3] mm/slub: Fix count_partial() problem

v1->v2:
- Improved changelog and variable naming for PATCH 1~2.
- PATCH3 adds per-cpu counter to avoid performance regression
  in concurrent __slab_free().

[Testing]
On my 32-cpu 2-socket physical machine:
Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz
perf stat --null --repeat 10 -- hackbench 20 thread 20000

== original, no patched
      19.211637055 seconds time elapsed                                          ( +-  0.57% )

== patched with patch1~2
 Performance counter stats for 'hackbench 20 thread 20000' (10 runs):

      21.731833146 seconds time elapsed                                          ( +-  0.17% )

== patched with patch1~3
 Performance counter stats for 'hackbench 20 thread 20000' (10 runs):

      19.112106847 seconds time elapsed                                          ( +-  0.64% )


Xunlei Pang (3):
  mm/slub: Introduce two counters for partial objects
  mm/slub: Get rid of count_partial()
  mm/slub: Use percpu partial free counter

 mm/slab.h |   2 +
 mm/slub.c | 124 +++++++++++++++++++++++++++++++++++++++++++-------------------
 2 files changed, 89 insertions(+), 37 deletions(-)

-- 
1.8.3.1