linux-kernel - Re: [PATCH v3 0/4] thermal: re-calculate k_po/k

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Message-ID: <20160106100712.GA2790@e104805>
Date:	Wed, 6 Jan 2016 10:07:13 +0000
From:	Javi Merino <javi.merino@....com>
To:	Leo Yan <leo.yan@...aro.org>
Cc:	Jonathan Corbet <corbet@....net>, Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Punit Agrawal <punit.agrawal@....com>,
	Daniel Kurtz <djkurtz@...omium.org>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Daniel Thompson <daniel.thompson@...aro.org>
Subject: Re: [PATCH v3 0/4] thermal: re-calculate k_po/k_pu when update
 sustainable power

On Wed, Jan 06, 2016 at 04:53:44PM +0800, Leo Yan wrote:
> k_po/k_pu are two proportional term constants and essentially they have
> fixed ratio compared with sustainable power. In current implementation,
> k_po and k_pu are absolute value after calculation and cannot represent
> the ratio relationship with sustainable power; as a result, when change
> sustainable power we cannot smoothly change proportional term constant.

In v2 Daniel said that the use case was made up.  Can you elaborate on
why we need this?

> So this patch series introduces k_po_ratio and k_pu_ratio, which
> represent the ratio value compared against sustainable power. Also add
> sys file system nodes for them for easily update them from userspace and
> update a bit in documentation.

Actually, it makes it harder to update from userspace.  Now userspace
can't set a k_po/k_pu any more, and it's forced to set them as ratios
of sustainable power. I'd rather not do this unless there is a good
reason for it.

Cheers,
Javi
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