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

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Message-ID: <20160316223916.GK6344@twins.programming.kicks-ass.net>
Date:	Wed, 16 Mar 2016 23:39:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
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 Wed, Mar 16, 2016 at 10:38:14PM +0100, Rafael J. Wysocki wrote:
> > If you care what cpu the work runs on, you should schedule_work_on(),
> > regular schedule_work() can end up on any random cpu (although typically
> > it does not).
> 
> I know, but I don't care too much.
> 
> "ondemand" and "conservative" use schedule_work() for the same thing, so
> drivers need to cope with that if they need things to run on a particular
> CPU.

Or are just plain buggy -- like a lot of code that uses schedule_work()
for per-cpu thingies; that is, its a fairly common bug and only recently
did we add that RR thing.