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

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Message-ID: <aF0y0G4eJZtnMALp@jlelli-thinkpadt14gen4.remote.csb>
Date: Thu, 26 Jun 2025 13:45:20 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Marcel Ziswiler <marcel.ziswiler@...ethink.co.uk>
Cc: luca abeni <luca.abeni@...tannapisa.it>, 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)

On 26/06/25 04:59, Marcel Ziswiler wrote:
> 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!

Great! Thanks a lot for testing and the patience. :-)

I will be sending out a polished version of the set soon. Please take a
look and add your reviewed/tested-by to that if you can. The changes are
the same you have been testing already, just with changelogs etc. Let's
see if people spot problems with the actual implementation of the fixes.

Best,
Juri