linux-kernel - Re: [PATCH v5 bpf-next 1/3] bpf: Add kmem

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Message-ID: <99d33f0b-5991-4b23-908f-aabb9fdccb98@suse.cz>
Date: Mon, 14 Oct 2024 17:25:52 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Namhyung Kim <namhyung@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>,
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
 bpf@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
 Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
 David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org,
 Arnaldo Carvalho de Melo <acme@...nel.org>, Kees Cook <kees@...nel.org>,
 "Paul E. McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH v5 bpf-next 1/3] bpf: Add kmem_cache iterator

On 10/11/24 01:25, Namhyung Kim wrote:
> The new "kmem_cache" iterator will traverse the list of slab caches
> and call attached BPF programs for each entry.  It should check the
> argument (ctx.s) if it's NULL before using it.
> 
> Now the iteration grabs the slab_mutex only if it traverse the list and
> releases the mutex when it runs the BPF program.  The kmem_cache entry
> is protected by a refcount during the execution.
> 
> It includes the internal "mm/slab.h" header to access kmem_cache,
> slab_caches and slab_mutex.  Hope it's ok to mm folks.

Yeah this paragraph can be dropped.

> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Vlastimil Babka <vbabka@...e.cz> #slab