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

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Message-ID: <d70bdffe973d1d4b951af3f12d3a5a1e77c879c6.camel@codethink.co.uk>
Date: Thu, 26 Jun 2025 04:59:42 -0600
From: Marcel Ziswiler <marcel.ziswiler@...ethink.co.uk>
To: luca abeni <luca.abeni@...tannapisa.it>, Juri Lelli
 <juri.lelli@...hat.com>
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 Luca and Juri

On Wed, 2025-06-25 at 14:50 +0200, luca abeni wrote:
> Hi Juri,
> 
> On Wed, 25 Jun 2025 12:11:46 +0200
> Juri Lelli <juri.lelli@...hat.com> wrote:
> [...]
> > I pushed another fixup adding a check for dl_server_active in
> > dl_server_stop(). It seems to cure the WARN here.
> > 
> > Could you please pull and re-test?
> 
> I added your last 2 commits, and tested again; it seems to me that
> everything looks fine, now... Marcel, can you confirm?

Indeed, our CI run now close to 220 mio. tests on NUCs and 190 mio. on ROCK 5B and so far it didn't miss any
single beat! Also the statistics around those tests look very good. With reclaim enabled one can now truly get
very good real-time performance. Thank you very much!

We will continue to exercise the Linux kernel scheduler to the fullest and report any inconsistencies we are
seeing.

Just let me know if there is anything else we may help you with. Thanks again!

> 			Luca

Cheers

Marcel