linux-kernel - Re: [PATCH v5 2/6] mm/slab: Plumb kmem_buckets into __do_kmalloc

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Message-ID: <88954479-01a3-4bbe-8558-1a71b11503f8@suse.cz>
Date: Thu, 20 Jun 2024 15:37:31 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Kees Cook <kees@...nel.org>
Cc: "GONG, Ruiqi" <gongruiqi@...weicloud.com>,
 Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
 David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>,
 jvoisin <julien.voisin@...tri.org>, Andrew Morton
 <akpm@...ux-foundation.org>, Roman Gushchin <roman.gushchin@...ux.dev>,
 Hyeonggon Yoo <42.hyeyoo@...il.com>, Xiu Jianfeng <xiujianfeng@...wei.com>,
 Suren Baghdasaryan <surenb@...gle.com>,
 Kent Overstreet <kent.overstreet@...ux.dev>, Jann Horn <jannh@...gle.com>,
 Matteo Rizzo <matteorizzo@...gle.com>, Thomas Graf <tgraf@...g.ch>,
 Herbert Xu <herbert@...dor.apana.org.au>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, linux-hardening@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v5 2/6] mm/slab: Plumb kmem_buckets into
 __do_kmalloc_node()

On 6/20/24 3:08 PM, Vlastimil Babka wrote:
> On 6/19/24 9:33 PM, Kees Cook wrote:
> I was wondering why I don't see the buckets in slabinfo and turns out it was
> SLAB_MERGE_DEFAULT. It would probably make sense for SLAB_MERGE_DEFAULT to
> depends on !SLAB_BUCKETS now as the merging defeats the purpose, wdyt?

Hm I might have been just blind, can see them there now. Anyway it probably
doesn't make much sense to have SLAB_BUCKETS and/or RANDOM_KMALLOC_CACHES
together with SLAB_MERGE_DEFAULT?