linux-kernel - Re: [PATCH V7 0/9] SCHED_DEADLINE server infrastructure

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Date: Fri, 21 Jun 2024 11:09:44 -0400
From: Vineeth Remanan Pillai <vineeth@...byteword.org>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, 
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Daniel Bristot de Oliveira <bristot@...hat.com>, Valentin Schneider <vschneid@...hat.com>, linux-kernel@...r.kernel.org, 
	Luca Abeni <luca.abeni@...tannapisa.it>, 
	Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>, Thomas Gleixner <tglx@...utronix.de>, 
	Joel Fernandes <joel@...lfernandes.org>, Shuah Khan <skhan@...uxfoundation.org>, 
	Phil Auld <pauld@...hat.com>, Suleiman Souhlal <suleiman@...gle.com>, 
	Youssef Esmat <youssefesmat@...gle.com>
Subject: Re: [PATCH V7 0/9] SCHED_DEADLINE server infrastructure

On Fri, Jun 21, 2024 at 10:59 AM Daniel Bristot de Oliveira
<bristot@...nel.org> wrote:
>
> On 6/21/24 16:41, Vineeth Remanan Pillai wrote:
> > Sorry that I could not get to reviewing and testing this revision. In
> > v6 we had experienced a minor bug where suspend/resume had issues with
> > dlserver. Since suspend does not do dequeue, dlserver is not stopped
> > and this causes the premature wakeups.
>
> Ouch! I will have a look next week on this. Do you guys know any other bug?
>
> an earlier report without necessarily a fix/work around is a good thing
> for us to try to reproduce it/think about it as earlier as we can...
>
Sorry my mistake, I was buried in other things and missed reporting
this earlier.

There was another minor regression seen lately after we fixed the
above issue- idle cpu was spending more time in C7 than C10 with the
dlserver changes. This was reported very recently and we haven't
investigated this much yet. Just a heads up and will keep you posted
as we know more.

Thanks,
Vineeth