netdev - Re: [RFC] Add BPF_PROG_TYPE_CGROUP

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Message-ID: <CAOWid-eXMqcNpjFxbcuUDU7Y-CCYJRNT_9mzqFYm1jeCPdADGQ@mail.gmail.com>
Date:   Mon, 1 Feb 2021 11:51:07 -0500
From:   Kenny Ho <y2kenny@...il.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Dave Airlie <airlied@...il.com>, Kenny Ho <Kenny.Ho@....com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
        Alex Deucher <alexander.deucher@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Brian Welty <brian.welty@...el.com>
Subject: Re: [RFC] Add BPF_PROG_TYPE_CGROUP_IOCTL

[Resent in plain text.]

On Mon, Feb 1, 2021 at 9:49 AM Daniel Vetter <daniel@...ll.ch> wrote:
> - there's been a pile of cgroups proposal to manage gpus at the drm
>   subsystem level, some by Kenny, and frankly this at least looks a bit
>   like a quick hack to sidestep the consensus process for that.
No Daniel, this is quick *draft* to get a conversation going.  Bpf was
actually a path suggested by Tejun back in 2018 so I think you are
mischaracterizing this quite a bit.

"2018-11-20 Kenny Ho:
To put the questions in more concrete terms, let say a user wants to
 expose certain part of a gpu to a particular cgroup similar to the
 way selective cpu cores are exposed to a cgroup via cpuset, how
 should we go about enabling such functionality?

2018-11-20 Tejun Heo:
Do what the intel driver or bpf is doing?  It's not difficult to hook
into cgroup for identification purposes."

Kenny