linux-kernel - Re: [PATCH v3 02/21] slab: add SLAB_CONSISTENCY_CHECKS to SLAB_NEVER

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Message-ID: <aW2oA98AZYY_gC5t@hyeyoo>
Date: Mon, 19 Jan 2026 12:41:55 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Petr Tesarik <ptesarik@...e.com>, Christoph Lameter <cl@...two.org>,
        David Rientjes <rientjes@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>, Hao Li <hao.li@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Alexei Starovoitov <ast@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
        bpf@...r.kernel.org, kasan-dev@...glegroups.com
Subject: Re: [PATCH v3 02/21] slab: add SLAB_CONSISTENCY_CHECKS to
 SLAB_NEVER_MERGE

On Fri, Jan 16, 2026 at 03:40:22PM +0100, Vlastimil Babka wrote:
> All the debug flags prevent merging, except SLAB_CONSISTENCY_CHECKS. This
> is suboptimal because this flag (like any debug flags) prevents the
> usage of any fastpaths, and thus affect performance of any aliased
> cache. Also the objects from an aliased cache than the one specified for
> debugging could also interfere with the debugging efforts.
> 
> Fix this by adding the whole SLAB_DEBUG_FLAGS collection to
> SLAB_NEVER_MERGE instead of individual debug flags, so it now also
> includes SLAB_CONSISTENCY_CHECKS.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---

Reviewed-by: Harry Yoo <harry.yoo@...cle.com>

-- 
Cheers,
Harry / Hyeonggon