linux-kernel - Re: [PATCH v2] Documentation: kernel-parameters: remove slab_max

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Date:   Thu, 23 Nov 2023 09:33:12 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     sxwjean@...com
Cc:     vbabka@...e.cz, linux-mm@...ck.org, cl@...ux.com,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, roman.gushchin@...ux.dev,
        corbet@....net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Xiongwei Song <xiongwei.song@...driver.com>
Subject: Re: [PATCH v2] Documentation: kernel-parameters: remove
 slab_max_order and noaliencache

On Wed, Nov 22, 2023 at 11:36 PM <sxwjean@...com> wrote:
>
> From: Xiongwei Song <xiongwei.song@...driver.com>
>
> Since slab allocator has already been removed. There is no users about
> slab_max_order and noaliencache, so let's remove them.
>
> Signed-off-by: Xiongwei Song <xiongwei.song@...driver.com>
> ---
> v2: Hyeonggon Yoo <42.hyeyoo@...il.com> suggested that noaliencache should be
> removed too. Here adding this change. The patch is based on [1].
>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=slab-remove-slab-v2r1
>
> v1: https://lore.kernel.org/linux-mm/20231120091214.150502-1-sxwjean@me.com/T/#m55ebb45851bc86d650baf65dfe8296d33c5b1126
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 10 ----------
>  1 file changed, 10 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 65731b060e3f..d56a5beefe24 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -3740,10 +3740,6 @@
>         no5lvl          [X86-64,RISCV] Disable 5-level paging mode. Forces
>                         kernel to use 4-level paging instead.
>
> -       noaliencache    [MM, NUMA, SLAB] Disables the allocation of alien
> -                       caches in the slab allocator.  Saves per-node memory,
> -                       but will impact performance.
> -
>         noalign         [KNL,ARM]
>
>         noaltinstr      [S390] Disables alternative instructions patching
> @@ -5887,12 +5883,6 @@
>                         own.
>                         For more information see Documentation/mm/slub.rst.
>
> -       slab_max_order= [MM, SLAB]
> -                       Determines the maximum allowed order for slabs.
> -                       A high setting may cause OOMs due to memory
> -                       fragmentation.  Defaults to 1 for systems with
> -                       more than 32MB of RAM, 0 otherwise.
> -
>         slub_debug[=options[,slabs][;[options[,slabs]]...]      [MM, SLUB]
>                         Enabling slub_debug allows one to determine the
>                         culprit if slab objects become corrupted. Enabling

Acked-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Thanks!

--
Hyeonggon