linux-kernel - RE: [RFC PATCH 2/3] mm/slub: unify all sl[au]b parameters with "slab

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Message-ID: <PH0PR11MB51923F916D8FB7D94270BBA7EC80A@PH0PR11MB5192.namprd11.prod.outlook.com>
Date:   Sat, 2 Dec 2023 04:23:29 +0000
From:   "Song, Xiongwei" <Xiongwei.Song@...driver.com>
To:     Kees Cook <keescook@...omium.org>,
        "sxwjean@...com" <sxwjean@...com>
CC:     "vbabka@...e.cz" <vbabka@...e.cz>,
        "42.hyeyoo@...il.com" <42.hyeyoo@...il.com>,
        "cl@...ux.com" <cl@...ux.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "penberg@...nel.org" <penberg@...nel.org>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "iamjoonsoo.kim@....com" <iamjoonsoo.kim@....com>,
        "roman.gushchin@...ux.dev" <roman.gushchin@...ux.dev>,
        "corbet@....net" <corbet@....net>, "arnd@...db.de" <arnd@...db.de>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 2/3] mm/slub: unify all sl[au]b parameters with
 "slab_$param"



> -----Original Message-----
> From: Kees Cook <keescook@...omium.org>
> Sent: Saturday, December 2, 2023 1:48 AM
> To: sxwjean@...com
> Cc: vbabka@...e.cz; 42.hyeyoo@...il.com; cl@...ux.com; linux-mm@...ck.org;
> penberg@...nel.org; rientjes@...gle.com; iamjoonsoo.kim@....com;
> roman.gushchin@...ux.dev; corbet@....net; arnd@...db.de; akpm@...ux-
> foundation.org; gregkh@...uxfoundation.org; linux-doc@...r.kernel.org; linux-
> kernel@...r.kernel.org; Song, Xiongwei <Xiongwei.Song@...driver.com>
> Subject: Re: [RFC PATCH 2/3] mm/slub: unify all sl[au]b parameters with "slab_$param"
> 
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> 
> On Fri, Dec 01, 2023 at 11:15:04AM +0800, sxwjean@...com wrote:
> > From: Xiongwei Song <xiongwei.song@...driver.com>
> >
> > Since the SLAB allocator has been removed, so we need to clean up the
> > sl[au]b_$params. However, the "slab/SLAB" terms should be keep for
> > long-term rather than "slub/SLUB". Hence, we should use "slab_$param"
> > as the primary prefix, which is pointed out by Vlastimil Babka. For more
> > information please see [1].
> >
> > This patch is changing the following slab parameters
> > - slub_max_order
> > - slub_min_order
> > - slub_min_objects
> > - slub_debug
> > to
> > - slab_max_order
> > - slab_min_order
> > - slab_min_objects
> > - slab_debug
> > as the primary slab parameters in
> > Documentation/admin-guide/kernel-parameters.txt and source, and rename all
> > setup functions of them too. Meanwhile, "slub_$params" can also be passed
> > by command line, which is to keep backward compatibility. Also mark all
> > "slub_$params" as legacy.
> 
> *If* we do this, I think the old names need to be recognized, perhaps
> with a boot pr_warn() about their deprecation/renaming for several
> releases (likely across LTSes). I think it's not a good idea to
> wholesale rename these with no warning. That's going to cause a lot of
> surprises and broken userspace...

Oh, yes, that's a good idea. Will update.

Regards,
Xiongwei
> 
> --
> Kees Cook