linux-kernel - Re: SCHED_DEADLINE tasks missing their deadline with SCHED_FLAG

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Message-ID: <e8f17a35f4bc2701fc3f6a34341a507fb89573fe.camel@codethink.co.uk>
Date: Wed, 25 Jun 2025 09:55:49 -0600
From: Marcel Ziswiler <marcel.ziswiler@...ethink.co.uk>
To: Juri Lelli <juri.lelli@...hat.com>, luca abeni
 <luca.abeni@...tannapisa.it>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>, Peter
 Zijlstra <peterz@...radead.org>, Vineeth Pillai <vineeth@...byteword.org>
Subject: Re: SCHED_DEADLINE tasks missing their deadline with
 SCHED_FLAG_RECLAIM jobs in the mix (using GRUB)

Hi Juri

On Tue, 2025-06-24 at 14:59 +0200, Juri Lelli wrote:
> Hello again,
> 
> On 24/06/25 09:49, Juri Lelli wrote:
> 
> ...
> 
> > The following seem to at least cure the problem after boot. Things are
> > still broken after cpusets creation. Moving to look into that, but
> > wanted to share where I am so that we don't duplicate work.
> 
> I ended up with two additional patches that seem to make things a little
> better at my end. You can find them at
> 
> https://github.com/jlelli/linux/tree/upstream/fix-grub
> 
> Marcel, Luca, can you please give them a quick try to check if they do
> any good?

I gave this a try yesterday and run a first longer test in our CI. While that now only run for 16 hours doing
30+ mio. tests on NUCs and 75+ mio. on ROCK 5B it really looks promising so far.

I will now update to your latest patches and re-run those tests. Usually we need 40+ hours of testing to really
be confident in our statistics around those tests.

> Thanks!

Thank you!

> Juri

Cheers from the OSS NA/ELC in Denver

Marcel