linux-kernel - Re: [RFC PATCH v2 0/6] slub: Delay freezing of CPU partial slabs

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Date:   Sun, 22 Oct 2023 23:52:59 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     chengming.zhou@...ux.dev
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org, vbabka@...e.cz,
        roman.gushchin@...ux.dev, willy@...radead.org, pcc@...gle.com,
        tytso@....edu, maz@...nel.org, ruansy.fnst@...itsu.com,
        vishal.moola@...il.com, lrh2000@....edu.cn, hughd@...gle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: Re: [RFC PATCH v2 0/6] slub: Delay freezing of CPU partial slabs

On Sat, Oct 21, 2023 at 11:43 PM <chengming.zhou@...ux.dev> wrote:
>
> From: Chengming Zhou <zhouchengming@...edance.com>
>
> Changes in RFC v2:
>  - Reuse PG_workingset bit to keep track of whether slub is on the
>    per-node partial list, as suggested by Matthew Wilcox.
>  - Fix OOM problem on kernel without CONFIG_SLUB_CPU_PARTIAL, which
>    is caused by leak of partial slabs when get_partial_node().
>  - Add a patch to simplify acquire_slab().
>  - Reorder patches a little.
>  - v1: https://lore.kernel.org/all/20231017154439.3036608-1-chengming.zhou@linux.dev/

I've picked [1] and tested this patch series and it passed a simple MM
& slab test
in 30 different SLUB configurations [2].

Also there's code coverage information [3] if you're interested :P

For the series,
Tested-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Will review when I have free time ;)
Thanks!

[1] https://git.kerneltesting.org/slab-experimental/log/
[2] https://jenkins.kerneltesting.org/job/slab-experimental/
[3] https://coverage.kerneltesting.org/slab-experimental-6283c415/mm/index.html

> Chengming Zhou (6):
>   slub: Keep track of whether slub is on the per-node partial list
>   slub: Prepare __slab_free() for unfrozen partial slab out of node
>     partial list
>   slub: Don't freeze slabs for cpu partial
>   slub: Simplify acquire_slab()
>   slub: Introduce get_cpu_partial()
>   slub: Optimize deactivate_slab()
>
>  include/linux/page-flags.h |   2 +
>  mm/slab.h                  |  19 +++
>  mm/slub.c                  | 245 +++++++++++++++++++------------------
>  3 files changed, 150 insertions(+), 116 deletions(-)
>
> --
> 2.20.1
>