linux-kernel - Re: [PATCH sched_ext/for-6.11 2/2] sched_ext: Implement scx_bpf_consume

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Date: Mon, 1 Jul 2024 17:55:25 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Tejun Heo <tj@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, Alexei Starovoitov <ast@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>, 
	David Vernet <void@...ifault.com>
Subject: Re: [PATCH sched_ext/for-6.11 2/2] sched_ext: Implement scx_bpf_consume_task()

On Fri, Jun 28, 2024 at 6:35 PM Tejun Heo <tj@...nel.org> wrote:
>
> Hello, Andrii.
>
> On Fri, Jun 28, 2024 at 04:56:55PM -0700, Andrii Nakryiko wrote:
> > > Just a bit of addition and a question. scx_bpf_consume_task() is maybe named
> > > too generically and I have a hard time imagining it being useful outside
> > > iteration loop. So, it does work out kinda neatly if we can tie the whole
> > > thing (DSQ lookup, barrier seq) to the iterator.
> > >
> > > The reason why this becomes nasty is because I can't pass the pointer to the
> > > iterator to a kfunc, so maybe allowing that can be a solution here too?
> >
> > Sure, if that's the best way to go about this.
>
> If we decide to go this way, how difficult would it be to change the
> verifier to allow this?

Shouldn't be too difficult, but we'll know for sure when we start
implementing this, of course.

>
> BTW, as none of the practical schedulers use consume_task() yet, I can skip
> this for now. I'll post an updated patches for the iterator itself. We can
> decide what to do with consume_task() later.
>

Sounds good.

> Thanks.
>
> --
> tejun