linux-kernel - Re: [PATCH bpf-next v1 2/5] cgroup: bpf: add cgroup_rstat_updated() and cgroup_rstat

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Message-ID: <YodCPWqZodr7Shnj@slm.duckdns.org>
Date:   Thu, 19 May 2022 21:24:45 -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>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Hocko <mhocko@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        David Rientjes <rientjes@...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 v1 2/5] cgroup: bpf: add cgroup_rstat_updated()
 and cgroup_rstat_flush() kfuncs

On Fri, May 20, 2022 at 01:21:30AM +0000, Yosry Ahmed wrote:
> Add cgroup_rstat_updated() and cgroup_rstat_flush() kfuncs to bpf
> tracing programs. bpf programs that make use of rstat can use these
> functions to inform rstat when they update stats for a cgroup, and when
> they need to flush the stats.
> 
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>

Do patch 1 and 2 need to be separate? Also, can you explain and comment why
it's __weak?

Thanks.

-- 
tejun