linux-kernel - Re: [PATCH 31/31] sched_ext: Add a rust userspace hybrid example scheduler

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Date:   Mon, 12 Dec 2022 15:03:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...nel.org, joshdon@...gle.com, brho@...gle.com,
        pjt@...gle.com, derkling@...gle.com, haoluo@...gle.com,
        dvernet@...a.com, dschatzberg@...a.com, dskarlat@...cmu.edu,
        riel@...riel.com, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH 31/31] sched_ext: Add a rust userspace hybrid example
 scheduler

On Tue, Nov 29, 2022 at 10:23:13PM -1000, Tejun Heo wrote:
> From: Dan Schatzberg <dschatzberg@...a.com>
> 
> Atropos is a multi-domain BPF / userspace hybrid scheduler where the BPF
> part does simple round robin in each domain and the userspace part
> calculates the load factor of each domain and tells the BPF part how to load
> balance the domains.
> 
> This scheduler demonstrates dividing scheduling logic between BPF and
> userspace and using rust to build the userspace part.

And here I am, speaking neither Rust nor BPF.

But really, having seen some of this I long for the UMCG patches -- that
at least was somewhat sane and trivially composes, unlike all this
madness.