linux-kernel - Re: [PATCH 09/15] x86, amd: add accessor for number of cores per compute unit

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Message-ID: <55E46EB7.6000603@roeck-us.net>
Date:	Mon, 31 Aug 2015 08:11:51 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Huang Rui <ray.huang@....com>, Borislav Petkov <bp@...e.de>,
	Jean Delvare <jdelvare@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andreas Herrmann <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>
Subject: Re: [PATCH 09/15] x86, amd: add accessor for number of cores per
 compute unit

On 08/31/2015 07:57 AM, Peter Zijlstra wrote:
> On Mon, Aug 31, 2015 at 06:53:58AM -0700, Guenter Roeck wrote:
>
>> What does that have to do with 'hwmon' ? The current implementation in the
>> driver may not be a good idea, and maybe for good reasons; I can not
>> comment on that. However, you concluded from that implementation that
>> hwmon, the subsystem, would not be able to support 'much finer grained
>> measurements than system wide'. I would like to understand how you reached
>> that conclusion.
>
> Purely going on what this driver does here. I assumed it was
> representative of things, if not then good.
>
Corollary: If a driver in subsystem X doesn't support interrupts,
it is a fair conclusion that subsystem X doesn't support interrupts.

The hwmon subsystem may have its limitations, and for sure would deserve
an overhaul, but at the same time people should refrain from bashing it
for no good reason.

Guenter

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