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

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Message-ID: <CAADnVQ+5hq0g3K6B_uPWg4AzrTjus0kKyqtgd1-UyME9TPZL-w@mail.gmail.com>
Date: Fri, 11 Oct 2024 11:33:31 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, 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 <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>, Vlastimil Babka <vbabka@...e.cz>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Hyeonggon Yoo <42.hyeyoo@...il.com>, 
	linux-mm <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 Thu, Oct 10, 2024 at 4:25 PM Namhyung Kim <namhyung@...nel.org> 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

traverses

> 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.

What was the reason you dropped Vlastimil's and Roman's acks
from this patch while keeping them in patch 2 ?

Folks pls Ack again if it looks ok.

I'm ready to apply, but would like the acks first.

Also I'd like to remove the above paragraph
from mm/slab.h from the commit log.
It was good to ask during v1, but looks odd at v5.