linux-kernel - Re: [PATCH v2] mm/slub: disable slab merging in the default configuration

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Message-ID: <598673f2-66e0-dc9c-4469-e0680685d81c@suse.cz>
Date:   Mon, 10 Jul 2023 16:56:12 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     David Rientjes <rientjes@...gle.com>,
        Julian Pidancet <julian.pidancet@...cle.com>
Cc:     Christoph Lameter <cl@...ux.com>,
        "Lameter, Christopher" <cl@...amperecomputing.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Rafael Aquini <aquini@...hat.com>
Subject: Re: [PATCH v2] mm/slub: disable slab merging in the default
 configuration

On 7/3/23 22:17, David Rientjes wrote:
> Additionally, I wouldn't consider this to be super urgent: slab cache 
> merging has been this way for several years, we have some time to do an 
> assessment of the implications of changing an important aspect of kernel 
> memory allocation that will affect everybody.

Agreed, although I wouldn't say "affect everybody" because the changed
upstream default may not automatically translate to what distros will use,
and I'd expect most people rely on distro kernels.

> I agree with the patch if 
> we can make it work, I'd just like to study the effect of it more fully 
> beyond some kernbench runs.