linux-kernel - Re: [PATCH v4 7/7] cpufreq: schedutil: New governor based on scheduler utilization data

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1619379.bIbaK6P2Xv@vostro.rjw.lan>
Date:	Wed, 16 Mar 2016 22:48:51 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Juri Lelli <juri.lelli@....com>,
	Steve Muckle <steve.muckle@...aro.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 7/7] cpufreq: schedutil: New governor based on scheduler utilization data

On Wednesday, March 16, 2016 06:53:41 PM Peter Zijlstra wrote:
> On Wed, Mar 16, 2016 at 03:59:18PM +0100, Rafael J. Wysocki wrote:
> > +static void sugov_update_commit(struct sugov_policy *sg_policy, u64 time,
> > +				unsigned int next_freq)
> > +{
> > +	struct cpufreq_policy *policy = sg_policy->policy;
> > +
> > +	if (next_freq > policy->max)
> > +		next_freq = policy->max;
> > +	else if (next_freq < policy->min)
> > +		next_freq = policy->min;
> 
> I'm still very much undecided on these policy min/max thresholds. I
> don't particularly like them.

These are for consistency mostly.

It actually occurs to me that __cpufreq_driver_target() does that already
anyway, so they can be moved into the "fast switch" branch.  Which means
that the code needs to be rearranged a bit here.