linux-kernel - Re: [PATCH v2] hwmon: Add driver for AMD family 15h processor power information

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Date:	Wed, 6 Apr 2011 09:14:45 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Jean Delvare <khali@...ux-fr.org>
CC:	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Thomas Renninger <trenn@...e.de>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] hwmon: Add driver for AMD family 15h processor
 power information

On Wed, Apr 06, 2011 at 11:35:43AM -0400, Jean Delvare wrote:
> On Wed, 6 Apr 2011 17:19:01 +0200, Andreas Herrmann wrote:
> > On Wed, Apr 06, 2011 at 04:14:01PM +0200, Jean Delvare wrote:
> > > On Tue, 5 Apr 2011 16:45:36 +0200, Andreas Herrmann wrote:
> > > > +static ssize_t show_power(struct device *dev,
> > > > +			  struct device_attribute *attr, char *buf)
> > > > +{
> > > > +	u32 val, btdp, tdpl, tdp2w, arange;
> > > > +	s32 acap;
> > > > +	u64 ctdp;
> > > 
> > > These variable names aren't easy to understand.
> > 
> > Just random names which eventually map to the spec:
> > 
> > btdp - base_tdp
> > tdpl - tdp_limit
> > tdp2w - tdp_to_watt
> > acap - average_accumulator_capture (or even worse how about "processor_tdp_running_average_accumulator":(
> > arange - average_range
> 
> avg_cap and avg_range would do, respectively, for the last two.
> 
> > I don't think that changing the names make it much easier to
> > reconstruct the calculation but if you insist in changing it I'll
> > adapt it.
> 
> I do prefer the "extended" names, really. Sure, this doesn't change the
> calculations, but it helps the reader understand what's going on. Which
> will be useful if one ever has to fix a bug in the code or extend it
> for a different CPU family.
> 
> But maybe this is just me. Guenter, do you have an opinion?
> 
I agree. base_tdp is definitely much better than btdp. Same for the others.

Thanks,
Guenter
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