linux-kernel - Re: [PATCH v1 2/3] cgroup: add cgroup_all_get_from

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Message-ID: <Y0S2UeE4reIRUdBH@slm.duckdns.org>
Date:   Mon, 10 Oct 2022 14:18:25 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Yonghong Song <yhs@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v1 2/3] cgroup: add cgroup_all_get_from_[fd/file]()

On Mon, Oct 10, 2022 at 05:14:24PM -0700, Yosry Ahmed wrote:
> On Mon, Oct 10, 2022 at 5:11 PM Tejun Heo <tj@...nel.org> wrote:
> >
> > On Mon, Oct 10, 2022 at 11:58:44PM +0000, Yosry Ahmed wrote:
> > > Add cgroup_all_get_from_fd() and cgroup_all_get_from_file() that
> > > support both cgroup1 and cgroup2.
> >
> > Looks generally good. How about cgroup_v1v2_ as the prefix?
> 
> Thanks for taking a look.
> 
> I don't have a strong opinion here. I picked cgroup_all_* vs
> cgroup12_* or cgroup_v1v2_* because it's easier on the eyes.

I'd rather have something which is really distinctive because the difference
is rather subtle.

> My preference would have been to rename the old versions to
> cgroup_dfl_* instead, but like you said this might confuse existing
> users.

Yeah, it's confusing to have parallel file / id lookup functions with
different behaviors and we've asssumed that all these from-userspace lookups
are cgroup2 only for a while now.

> Anyway, I am fine with whatever you choose. Let me know if you need me
> to send a v2 for changing the prefix.

Please send an updated version. I don't mind whether it's cgroup12_ or
cgroup_v1v2_.

Thanks.

-- 
tejun