linux-kernel - Re: [PATCH V4 0/2] Implement per policy instance of governor

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Date:	Sat, 30 Mar 2013 03:17:09 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, arvind.chauhan@....com, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, jacob.shin@....com
Subject: Re: [PATCH V4 0/2] Implement per policy instance of governor

On Wednesday, March 27, 2013 09:28:56 PM Viresh Kumar wrote:
> Hi Guys,
> 
> All patches are pushed here for others to apply (you can apply from mail to):
> http://git.linaro.org/gitweb?p=people/vireshk/linux.git;a=shortlog;h=refs/heads/governor-per-policy-v4
> 
> Currently, there can't be multiple instances of single governor_type. If we have
> a multi-package system, where we have multiple instances of struct policy (per
> package), we can't have multiple instances of same governor. i.e. We can't have
> multiple instances of ondemand governor for multiple packages.
> 
> Governors directory in sysfs is created at /sys/devices/system/cpu/cpufreq/
> governor-name/. Which again reflects that there can be only one instance of a
> governor_type in the system.
> 
> This is a bottleneck for multicluster system, where we want different packages
> to use same governor type, but with different tunables.
> 
> This patchset is inclined towards fixing this issue. Now we will create
> governors directory in cpu/cpu*/cpufreq/<gov> for platforms which have multiple
> struct policy alive at any moment. Platform drivers requiring this feature must
> set have_governor_per_policy variable in their instance of cpufreq_driver. For
> others the interface is kept same: cpu/cpufreq/<gov>.
> 
> 
> This is V4 of this patchset. V3 is already applied by Rafael in his linux-next
> branch. Jacob Shin reported some regressions with this patchset and when I went
> into testing it with his configuration I found more issues then what he
> reported.
> 
> To test these over linux-next you need to revert following first:
> db9baec cpufreq: Get rid of "struct global_attr"
> 86bd6f0 cpufreq: governor: Implement per policy instances of governors
> 8ae67b1 cpufreq: Add per policy governor-init/exit infrastructure
> 
> I have tested this for following now and believe there are no more regressions
> with it:
> - platform with a single policy instance or single group of cpu
> - platform with multiple policies but which don't want per policy instance of
>   governor
> - platform with multiple policies and which want per policy instance of governor
> 
> I have tried with different settings and combinations of governors.
> 
> @Rafael: To simplify your life I have sorted out your branch and you can simply
> pickup the complete branch that I have pushed.

I've applied these two patches and re-applied the queue on top of them.

All is in my linux-next branch now.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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