linux-kernel - Re: [RFC PATCH v2 0/6] SCHED_DEADLINE server infrastructure

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Date:   Wed, 9 Sep 2020 07:51:03 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Pavel Machek <pavel@....cz>
Cc:     peterz@...radead.org, mingo@...hat.com, rostedt@...dmis.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        luca.abeni@...tannapisa.it, tommaso.cucinotta@...tannapisa.it,
        alessio.balsini@...il.com, bristot@...hat.com,
        dietmar.eggemann@....com, linux-rt-users@...r.kernel.org,
        mtosatti@...hat.com, williams@...hat.com,
        valentin.schneider@....com
Subject: Re: [RFC PATCH v2 0/6] SCHED_DEADLINE server infrastructure

Hi Pavel,

On 09/09/20 00:22, Pavel Machek wrote:
> Hi!
> 
> > This is RFC v2 of Peter's SCHED_DEADLINE server infrastructure
> > implementation [1].
> > 
> > SCHED_DEADLINE servers can help fixing starvation issues of low priority tasks (e.g., 
> > SCHED_OTHER) when higher priority tasks monopolize CPU cycles. Today we have RT 
> > Throttling; DEADLINE servers should be able to replace and improve that.
> 
> It would be worth noting what "server" is in this context.

It comes from Constant Bandwidth Server (CBS), that SCHED_DEADLINE is
implementing [1].

> 
> It is not white box with CPU inside, it is not even an userland process, afaict.
> 
> Subject is quite confusing.

Best,
Juri

1 - https://elixir.bootlin.com/linux/latest/source/Documentation/scheduler/sched-deadline.rst#L42