linux-kernel - Re: [PATCH v3] sched: cpuset: Don't rebuild root domains on suspend-resume

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Message-ID: <20230301170322.xthlso7jfkixlyex@airbuntu>
Date:   Wed, 1 Mar 2023 17:03:22 +0000
From:   Qais Yousef <qyousef@...alina.io>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>, tj@...nel.org,
        linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org,
        cgroups@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Wei Wang <wvw@...gle.com>, Rick Yiu <rickyiu@...gle.com>,
        Quentin Perret <qperret@...gle.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Zefan Li <lizefan.x@...edance.com>, linux-s390@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH v3] sched: cpuset: Don't rebuild root domains on
 suspend-resume

On 03/01/23 15:26, Juri Lelli wrote:
> On 01/03/23 12:28, Qais Yousef wrote:
> > On 03/01/23 08:31, Juri Lelli wrote:
> 
> ...
> 
> > > Not ignoring you guys here, but it turns out I'm quite bogged down with
> > > other stuff at the moment. :/ So, apologies and I'll try to get to this
> > > asap. Thanks a lot for all your efforts and time reviewing so far!
> > 
> > Np, I can feel you :-)
> 
> Eh. :/

I hope I did not offend. That was meant as no pressure, I understand.

> 
> BTW, do you have a repro script of some sort handy I might play with?

Sorry no. You'll just need to suspend to ram. I had a simple patch to measure
the time around the call and trace_printk'ed the result.

I was working on a android phone which just suspends to ram if you turn the
screen off and disconnect the usb.

I think you can use rtcwake in normal desktop environment. Something like

	sudo rtcwake -u -s 5 -m mem


Thanks!

--
Qais Yousef