linux-kernel - Re: [PATCH RFC] ipc/mqueue: introduce msg cache

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Date:   Wed, 21 Dec 2022 10:29:37 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, Shakeel Butt <shakeelb@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Waiman Long <longman@...hat.com>,
        Sven Luther <Sven.Luther@...driver.com>
Subject: Re: [PATCH RFC] ipc/mqueue: introduce msg cache

On 20.12.22 19:48, Roman Gushchin wrote:
> Sven Luther reported a regression in the posix message queues
> performance caused by switching to the per-object tracking of
> slab objects introduced by patch series ending with the
> commit 10befea91b61 ("mm: memcg/slab: use a single set of kmem_caches for all
> allocations").
> [...]

Thx for looking into this

> The last line reflects the result with this patch ("6.1-rc8+p").
> 
> [1]: https://lore.kernel.org/linux-mm/Y46lqCToUa%2FBgt%2Fc@P9FQF9L96D/T/

This link...

> Reported-by: Sven Luther <Sven.Luther@...driver.com>

...should be here and look like this, as tools like regzbot otherwise
won't do the right thing:

Link: https://lore.kernel.org/linux-mm/Y46lqCToUa%2FBgt%2Fc@P9FQF9L96D/ [1]

For details, see:
https://lore.kernel.org/all/CAHk-=wjMmSZzMJ3Xnskdg4+GGz=5p5p+GSYyFBTh0f-DgvdBWg@mail.gmail.com/
https://lore.kernel.org/all/CAHk-=wgs38ZrfPvy=nOwVkVzjpM3VFU1zobP37Fwd_h9iAD5JQ@mail.gmail.com/
https://lore.kernel.org/all/CAHk-=wjxzafG-=J8oT30s7upn4RhBs6TX-uVFZ5rME+L5_DoJA@mail.gmail.com/
Documentation/process/submitting-patches.rst
(http://docs.kernel.org/process/submitting-patches.html)
Documentation/process/5.Posting.rst
(https://docs.kernel.org/process/5.Posting.html)

> Tested-by: Sven Luther <Sven.Luther@...driver.com>
> Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>

#regzbot ^backmonitor:
https://lore.kernel.org/linux-mm/Y46lqCToUa%2FBgt%2Fc@P9FQF9L96D/

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.