linux-kernel - Re: [PATCH 15/20] mm/slab: move kfree() from slab

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Date:   Mon, 13 Nov 2023 20:45:48 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        kasan-dev@...glegroups.com, cgroups@...r.kernel.org
Subject: Re: [PATCH 15/20] mm/slab: move kfree() from slab_common.c to slub.c

On Mon, Nov 13, 2023 at 08:13:56PM +0100, Vlastimil Babka wrote:
> This should result in better code. Currently kfree() makes a function
> call between compilation units to __kmem_cache_free() which does its own
> virt_to_slab(), throwing away the struct slab pointer we already had in
> kfree(). Now it can be reused. Additionally kfree() can now inline the
> whole SLUB freeing fastpath.
> 
> Also move over free_large_kmalloc() as the only callsites are now in
> slub.c, and make it static.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook