linux-kernel - RE: [PATCH 1/4] Documentation: kernel-parameters: remove slab_max

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Date:   Wed, 22 Nov 2023 05:19:32 +0000
From:   "Song, Xiongwei" <Xiongwei.Song@...driver.com>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        "sxwjean@...com" <sxwjean@...com>
CC:     "cl@...ux.com" <cl@...ux.com>,
        "penberg@...nel.org" <penberg@...nel.org>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "iamjoonsoo.kim@....com" <iamjoonsoo.kim@....com>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "roman.gushchin@...ux.dev" <roman.gushchin@...ux.dev>,
        "corbet@....net" <corbet@....net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] Documentation: kernel-parameters: remove
 slab_max_order



> -----Original Message-----
> From: owner-linux-mm@...ck.org <owner-linux-mm@...ck.org> On Behalf Of Hyeonggon
> Yoo
> Sent: Tuesday, November 21, 2023 4:30 PM
> To: sxwjean@...com
> Cc: cl@...ux.com; penberg@...nel.org; rientjes@...gle.com; iamjoonsoo.kim@....com;
> vbabka@...e.cz; roman.gushchin@...ux.dev; corbet@....net; linux-mm@...ck.org; linux-
> doc@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/4] Documentation: kernel-parameters: remove slab_max_order
> 
> CAUTION: This email comes from a non Wind River email account!
> Do not click links or open attachments unless you recognize the sender and know the
> content is safe.
> 
> On Mon, Nov 20, 2023 at 6:12 PM <sxwjean@...com> wrote:
> >
> > From: Xiongwei Song <xiongwei.song@...driver.com>
> >
> > Since slab allocator has already been removed. There is no users about
> > it, so remove it.
> >
> > Signed-off-by: Xiongwei Song <xiongwei.song@...driver.com>
> > ---
> >  Documentation/admin-guide/kernel-parameters.txt | 6 ------
> >  1 file changed, 6 deletions(-)
> >
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-
> guide/kernel-parameters.txt
> > index 65731b060e3f..c7709a11f8ce 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -5887,12 +5887,6 @@
> >                         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.
> > -
> 
> Good catch!
> 
> By the way I think noaliencache can be removed too in this patch together:

Thanks Hyeonggon. Will do that.

Regards,
Xiongwei

> >        noaliencache    [MM, NUMA, SLAB] Disables the allocation of alien
> >                       caches in the slab allocator.  Saves per-node memory,
> >                      but will impact performance.
> 
> Thanks,
> Hyeonggon