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Message-ID: <20190726220149.6f05f8df@sweethome>
Date: Fri, 26 Jul 2019 22:01:49 +0200
From: luca abeni <luca.abeni@...tannapisa.it>
To: Peter Zijlstra <peterz@...radead.org>
Cc: mingo@...nel.org, juri.lelli@...hat.com,
linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
bristot@...hat.com, balsini@...roid.com, dvyukov@...gle.com,
tglx@...utronix.de, vpillai@...italocean.com, rostedt@...dmis.org
Subject: Re: [RFC][PATCH 00/13] SCHED_DEADLINE server infrastructure
Hi Peter,
On Fri, 26 Jul 2019 16:54:09 +0200
Peter Zijlstra <peterz@...radead.org> wrote:
> Hi,
>
> So recently syzcaller ran into the big deadline/period issue (again),
> and I figured I should at least propose a patch that puts limits on
> that -- see Patch 1.
>
> During that discussion; SCHED_OTHER servers got mentioned (also
> again), and I figured I should have a poke at that too. So I took
> some inspiration from patches Alessio Balsini send a while back and
> cobbled something together for that too.
I think Patch 1 is a very good idea!
The server patches look interesting (and they seem to be much simpler
than our patchset :). I need to have a better look at them, but this
seems to be very promising.
Thanks,
Luca
>
> Included are also a bunch of patches I did for core scheduling (2-8),
> which I'm probably going to just merge as they're generic cleanups.
> They're included here because they make pick_next_task() simpler and
> thereby thinking about the nested pick_next_task() logic inherent in
> servers was less of a head-ache. (I think it can work fine without
> them, but its easier with them on)
>
> Anyway; after it all compiled it booted a kvm image all the way to
> userspace on the first run, so clearly this code isn't to be trusted
> at all.
>
> There's still lots of missing bits and pieces -- like changelogs and
> the fair server isn't configurable or hooked into the bandwidth
> accounting, but the foundation is there I think.
>
> Enjoy!
>
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