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

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Message-ID: <20110406162016.GF2177@alberich.amd.com>
Date:	Wed, 6 Apr 2011 18:20:16 +0200
From:	Andreas Herrmann <herrmann.der.user@...glemail.com>
To:	Guenter Roeck <guenter.roeck@...csson.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	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 09:14:45AM -0700, Guenter Roeck wrote:
> 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

Ok.

Will update the patch soon.


Andreas
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