linux-kernel - Re: [PATCH] cpufreq: longhaul: Set transition_delay

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Message-ID: <7734929.18g54ABnht@aspire.rjw.lan>
Date:   Thu, 07 Dec 2017 13:54:44 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Meelis Roos <mroos@...ux.ee>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "4 . 14+" <stable@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: longhaul: Set transition_delay_us to 20 ms

On Thursday, December 7, 2017 1:51:04 PM CET Meelis Roos wrote:
> > On 06-12-17, 20:21, Meelis Roos wrote:
> > > 30000 was not reliable.
> > > 
> > > I created root cron job
> > > @reboot sleep 120; /sbin/reboot
> > > 
> > > and by the evening it was dead again.
> > > 
> > > Will try 50000 tomorrow.
> > 
> > Lets make it similar to what it was before my original patch modified
> > it, to avoid all corner cases.
> > 
> > Please test against 200 ms, 200000 value here.
> 
> I tried
> 
> policy->transition_delay_us = 200000;
> 
> and it still hangs on top of mainline.
> 
> What next?

Well, please try to revert the commit you bisected the problem to and see
if that doesn't hang.