From: Tejun Heo <tj@kernel.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
yonghong.song@linux.dev, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, lizefan.x@bytedance.com,
hannes@cmpxchg.org, yosryahmed@google.com, mkoutny@suse.com,
sinquersw@gmail.com, longman@redhat.com, cgroups@vger.kernel.org,
bpf@vger.kernel.org, oliver.sang@intel.com
Subject: Re: [PATCH v3 bpf-next 02/11] cgroup: Make operations on the cgroup root_list RCU safe
Date: Thu, 9 Nov 2023 11:19:43 -1000 [thread overview]
Message-ID: <ZU1M77i1VTvi1_zb@slm.duckdns.org> (raw)
In-Reply-To: <20231029061438.4215-3-laoar.shao@gmail.com>
On Sun, Oct 29, 2023 at 06:14:29AM +0000, Yafang Shao wrote:
> At present, when we perform operations on the cgroup root_list, we must
> hold the cgroup_mutex, which is a relatively heavyweight lock. In reality,
> we can make operations on this list RCU-safe, eliminating the need to hold
> the cgroup_mutex during traversal. Modifications to the list only occur in
> the cgroup root setup and destroy paths, which should be infrequent in a
> production environment. In contrast, traversal may occur frequently.
> Therefore, making it RCU-safe would be beneficial.
>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
next prev parent reply other threads:[~2023-11-09 21:19 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-29 6:14 [PATCH v3 bpf-next 00/11] bpf, cgroup: Add BPF support for cgroup1 hierarchy Yafang Shao
2023-10-29 6:14 ` [PATCH v3 bpf-next 01/11] cgroup: Remove unnecessary list_empty() Yafang Shao
2023-11-09 21:09 ` Tejun Heo
2023-10-29 6:14 ` [PATCH v3 bpf-next 02/11] cgroup: Make operations on the cgroup root_list RCU safe Yafang Shao
2023-11-09 21:19 ` Tejun Heo [this message]
2023-10-29 6:14 ` [PATCH v3 bpf-next 03/11] cgroup: Eliminate the need for cgroup_mutex in proc_cgroup_show() Yafang Shao
2023-11-09 21:20 ` Tejun Heo
2023-10-29 6:14 ` [PATCH v3 bpf-next 04/11] cgroup: Add annotation for holding namespace_sem in current_cgns_cgroup_from_root() Yafang Shao
2023-11-09 21:22 ` Tejun Heo
2023-10-29 6:14 ` [PATCH v3 bpf-next 05/11] cgroup: Add a new helper for cgroup1 hierarchy Yafang Shao
2023-11-09 9:33 ` Hou Tao
2023-11-09 21:27 ` Tejun Heo
2023-11-09 23:30 ` Tejun Heo
2023-11-10 2:37 ` Yafang Shao
2023-10-29 6:14 ` [PATCH v3 bpf-next 06/11] bpf: Add a new kfunc " Yafang Shao
2023-10-30 9:00 ` kernel test robot
2023-10-30 11:35 ` Yafang Shao
2023-10-30 13:59 ` Jiri Olsa
2023-10-31 2:40 ` Yafang Shao
2023-10-31 4:22 ` David Marchevsky
2023-11-03 8:18 ` kernel test robot
2023-11-03 8:49 ` Yafang Shao
2023-11-05 6:22 ` [PATCH bpf-next] compiler-gcc: Ignore -Wmissing-prototypes warning for older GCC Yafang Shao
2023-11-05 8:24 ` Arnd Bergmann
2023-11-05 11:54 ` Yafang Shao
2023-11-05 13:01 ` Arnd Bergmann
2023-11-05 13:50 ` Yafang Shao
2023-11-06 3:18 ` [PATCH v2 bpf-next] compiler-gcc: Suppress -Wmissing-prototypes warning for all supported GCC Yafang Shao
2023-11-09 18:23 ` Alexei Starovoitov
2023-11-10 6:34 ` Arnd Bergmann
2023-11-10 7:48 ` Yafang Shao
2023-11-10 16:00 ` patchwork-bot+netdevbpf
2023-11-09 21:29 ` [PATCH v3 bpf-next 06/11] bpf: Add a new kfunc for cgroup1 hierarchy Tejun Heo
2023-10-29 6:14 ` [PATCH v3 bpf-next 07/11] selftests/bpf: Fix issues in setup_classid_environment() Yafang Shao
2023-10-29 6:14 ` [PATCH v3 bpf-next 08/11] selftests/bpf: Add parallel support for classid Yafang Shao
2023-10-29 6:14 ` [PATCH v3 bpf-next 09/11] selftests/bpf: Add a new cgroup helper get_classid_cgroup_id() Yafang Shao
2023-10-29 6:14 ` [PATCH v3 bpf-next 10/11] selftests/bpf: Add a new cgroup helper get_cgroup_hierarchy_id() Yafang Shao
2023-11-09 21:32 ` Tejun Heo
2023-11-10 2:40 ` Yafang Shao
2023-10-29 6:14 ` [PATCH v3 bpf-next 11/11] selftests/bpf: Add selftests for cgroup1 hierarchy Yafang Shao
2023-11-09 21:36 ` [PATCH v3 bpf-next 00/11] bpf, cgroup: Add BPF support " Tejun Heo
2023-11-09 23:06 ` Alexei Starovoitov
2023-11-09 23:28 ` Tejun Heo
2023-11-09 23:35 ` Alexei Starovoitov
2023-11-10 6:04 ` Yafang Shao
2023-11-10 17:05 ` Alexei Starovoitov
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