From: Ziyang Men <ziyang.meme@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: kernel-team@meta.com, "Jens Axboe" <axboe@kernel.dk>,
"Josef Bacik" <josef@toxicpanda.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Kumar Kartikeya Dwivedi" <memxor@gmail.com>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"Jiri Olsa" <jolsa@kernel.org>,
"Emil Tsalapatis" <emil@etsalapatis.com>,
"Shuah Khan" <shuah@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Koutný" <mkoutny@suse.com>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"Shakeel Butt" <shakeel.butt@linux.dev>,
"JP Kobryn" <inwardvessel@gmail.com>,
"Mykola Lysenko" <mykolal@meta.com>,
linux-block@vger.kernel.org, bpf@vger.kernel.org,
cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] block: add BPF kfuncs to read blkcg io.stat
Date: Tue, 18 Aug 2026 16:01:58 -0700 [thread overview]
Message-ID: <aoTkZhQDoaQKpPe3@devvm16600.scu0.facebook.com> (raw)
In-Reply-To: <aoTf7u20mo9s6ADj@slm.duckdns.org>
Hi Tejun,
On Tue, Aug 18, 2026 at 12:42:54PM -1000, Tejun Heo wrote:
>On Tue, Aug 18, 2026 at 03:31:29PM -0700, Ziyang Men wrote:
>> Ok I will add the casts bpf_get_blkcg() and bpf_put_blkcg(), and remove the
>> check of css->ss in above functoins.
>
>RCU_PROTECTED is probably better than get/put().
Yes we can make the blkcg* RCU_PROTECTED but then the bpf_blkcg_flush_stats()
needs to take the @cgroup* since it is SLEEPABLE. Does this work for you?
Best,
Ziyang
>
>Thanks.
>
>--
>tejun
next prev parent reply other threads:[~2026-08-18 23:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 21:42 [PATCH v2 0/2] block: expose blkcg io.stat to BPF Ziyang Men
2026-08-17 21:42 ` [PATCH v2 1/2] block: add BPF kfuncs to read blkcg io.stat Ziyang Men
2026-08-17 22:28 ` bot+bpf-ci
2026-08-18 17:21 ` Tejun Heo
2026-08-18 22:31 ` Ziyang Men
2026-08-18 22:42 ` Tejun Heo
2026-08-18 23:01 ` Ziyang Men [this message]
2026-08-17 21:42 ` [PATCH v2 2/2] selftests/bpf: add test for blkcg io.stat BPF kfuncs Ziyang Men
2026-08-17 22:41 ` bot+bpf-ci
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