linux-kernel - Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats

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Date:	Thu, 28 Jan 2016 14:10:41 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	rjw@...ysocki.net, linux-pm@...r.kernel.org, pc@...ibm.com,
	anton@...ba.org, ego@...ux.vnet.ibm.com,
	shreyas@...ux.vnet.ibm.com, bsingharora@...il.com,
	mpe@...erman.id.au, linux-api@...r.kernel.org
Subject: Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show
 throttle stats

On 28-01-16, 12:55, Shilpasri G Bhat wrote:
> diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
> index b683e8e..dea4620 100644
> --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
> +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
> @@ -271,3 +271,48 @@ Description:	Parameters for the CPU cache attributes
>  			- WriteBack: data is written only to the cache line and
>  				     the modified cache line is written to main
>  				     memory only when it is replaced
> +
> +What:		/sys/devices/system/cpu/cpufreq/chip*/throttle_stats

What about the chip directory ? Shouldn't that be documented? And
shouldn't that mention that this is just for powerpc ?

And before that, I don't think that you are doing this properly. I am
sorry that I never came to a point where I could review it, and you
continued with it, version after version.

But, I really have strong objections to the way this is done. And you
are making things more complex then they are.

So, these stats are per-policy, right ?

Then why aren't they added on the policy->kobj instead, just like
cpufreq-stats? And maybe inside cpufreq-stats folder only?

That will solve many complexities you have in place here and will look
sane as well.

Right now, you have stats as two places, cpu/cpufreq/chip/ and
cpu/cpuX/cpufreq/stats/, which doesn't look wise and adds to
confusion.

What do you say?

-- 
viresh