linux-kernel - Re: [PATCH rfc 0/6] Scheduler BPF

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Message-ID: <CALOAHbC0xNnqWt=og+g=DT0yRqST6cTAUvZkQ-7o8Nw8O-2J9w@mail.gmail.com>
Date:   Thu, 25 Nov 2021 14:00:04 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Roman Gushchin <guro@...com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH rfc 0/6] Scheduler BPF

Hi Roman,

Scheduler BPF is a great idea.
Thanks for the work.

Scheduler BPF won’t be a small feature,  I think we’d better give a
summary of possible hooks it may add first.
We must have a *basic rule* to control what it will tend to be to
avoid adding BPF hooks here and there.
I haven’t found a clear rule yet, but maybe we can learn it from
netfilter, which has 5 basic hooks.
Regarding the scheduler BPF hooks, some possible basic hooks may be:
  - Hook for Enqueue
  - Hook for Dequeue
  - Hook for Put Prev Task
   - Hook for Set Next Task


> An example of an userspace part, which loads some simple hooks is available
> here [3]. It's very simple, provided only to simplify playing with the provided
> kernel patches.
>

You’d better add this userspace code into samples/bpf/.


[Some error occurs in my mail client, so I resend it]


--
Thanks
Yafang