linux-kernel - Re: [PATCH RFC 03/19] slub: remove CONFIG_SLUB

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Message-ID: <CAADnVQKYkMVmjMrRhsg29fgYKQU8=bDJW3ghTHLbmFHJPmdNxA@mail.gmail.com>
Date: Fri, 24 Oct 2025 15:34:37 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Christoph Lameter <cl@...two.org>, 
	David Rientjes <rientjes@...gle.com>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Harry Yoo <harry.yoo@...cle.com>, Uladzislau Rezki <urezki@...il.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Suren Baghdasaryan <surenb@...gle.com>, 
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Alexei Starovoitov <ast@...nel.org>, linux-mm <linux-mm@...ck.org>, 
	LKML <linux-kernel@...r.kernel.org>, linux-rt-devel@...ts.linux.dev, 
	bpf <bpf@...r.kernel.org>, kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [PATCH RFC 03/19] slub: remove CONFIG_SLUB_TINY specific code paths

On Thu, Oct 23, 2025 at 6:53 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> CONFIG_SLUB_TINY minimizes the SLUB's memory overhead in multiple ways,
> mainly by avoiding percpu caching of slabs and objects. It also reduces
> code size by replacing some code paths with simplified ones through
> ifdefs, but the benefits of that are smaller and would complicate the
> upcoming changes.
>
> Thus remove these code paths and associated ifdefs and simplify the code
> base.
>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  mm/slab.h |   2 --
>  mm/slub.c | 107 +++-----------------------------------------------------------
>  2 files changed, 4 insertions(+), 105 deletions(-)

Looks like it is removing most of it.
Just remove the whole thing. Do people care about keeping SLUB_TINY?