linux-kernel - Re: [PATCH v2 00/21] remove the SLAB allocator

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Message-ID: <ZXEx1/p9ejRmkVTS@localhost.localdomain>
Date:   Thu, 7 Dec 2023 11:45:43 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        cgroups@...r.kernel.org, linux-hardening@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v2 00/21] remove the SLAB allocator

On Mon, Nov 20, 2023 at 07:34:11PM +0100, Vlastimil Babka wrote:
> Changes from v1:
> - Added new Patch 01 to fix up kernel docs build (thanks Marco Elver)
> - Additional changes to Kconfig user visible texts in Patch 02 (thanks Kees
>   Cook)
> - Whitespace fixes and other fixups (thanks Kees)
> 
> The SLAB allocator has been deprecated since 6.5 and nobody has objected
> so far. As we agreed at LSF/MM, we should wait with the removal until
> the next LTS kernel is released. This is now determined to be 6.6, and
> we just missed 6.7, so now we can aim for 6.8 and start exposing the
> removal to linux-next during the 6.7 cycle. If nothing substantial pops
> up, will start including this in slab-next later this week.

I've been testing this for a few weeks on my testing system,
It passed a set of mm and slab tests on various SLUB configurations.

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

Thanks!

> To keep the series reasonably sized and not pull in people from other
> subsystems than mm and closely related ones, I didn't attempt to remove
> every trace of unnecessary reference to dead config options in external
> areas, nor in the defconfigs. Such cleanups can be sent to and handled
> by respective maintainers after this is merged.
> 
> Instead I have added some patches aimed to reap some immediate benefits
> of the removal, mainly by not having to split some fastpath code between
> slab_common.c and slub.c anymore. But that is also not an exhaustive
> effort and I expect more cleanups and optimizations will follow later.
> 
> Patch 09 updates CREDITS for the removed mm/slab.c. Please point out if
> I missed someone not yet credited.
> 
> Git version: https://git.kernel.org/vbabka/l/slab-remove-slab-v2r1