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

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Date:   Tue, 24 Oct 2023 10:02:24 +0800
From:   Chengming Zhou <chengming.zhou@...ux.dev>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
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 2023/10/22 22:52, Hyeonggon Yoo wrote:
> 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>

Thank you! These are very helpful to me, I will also do more workloads
stress testing with more configurations.

> 
> Will review when I have free time ;)

Ok, thanks for your 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
>>