linux-kernel - Re: [PATCH bpf-next v5 6/8] cgroup: bpf: enable bpf programs to integrate with rstat

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Message-ID: <YuK+rbZXg7CYjLhE@slm.duckdns.org>
Date:   Thu, 28 Jul 2022 06:51:57 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Hao Luo <haoluo@...gle.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        KP Singh <kpsingh@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Michal Koutný <mkoutny@...e.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 6/8] cgroup: bpf: enable bpf programs to
 integrate with rstat

On Fri, Jul 22, 2022 at 05:48:27PM +0000, Yosry Ahmed wrote:
> Enable bpf programs to make use of rstat to collect cgroup hierarchical
> stats efficiently:
> - Add cgroup_rstat_updated() kfunc, for bpf progs that collect stats.
> - Add cgroup_rstat_flush() sleepable kfunc, for bpf progs that read stats.
> - Add an empty bpf_rstat_flush() hook that is called during rstat
>   flushing, for bpf progs that flush stats to attach to. Attaching a bpf
>   prog to this hook effectively registers it as a flush callback.
> 
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun