linux-kernel - Re: [PATCH 4/4] thermal: bang-bang governor: act on lower trip boundary

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Message-ID: <20160428063018.GX7860@pengutronix.de>
Date:	Thu, 28 Apr 2016 08:30:18 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	Caesar Wang <wxt@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
	dianders@...omium.org, briannorris@...gle.com, smbarber@...gle.com,
	linux-rockchip@...ts.infradead.org, dmitry.torokhov@...il.com,
	huangtao@...k-chips.com, eddie.cai@...k-chips.com,
	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] thermal: bang-bang governor: act on lower trip
 boundary

On Wed, Apr 27, 2016 at 02:54:26PM -0700, Eduardo Valentin wrote:
> On Mon, Apr 25, 2016 at 11:02:47AM +0800, Caesar Wang wrote:
> > From: Sascha Hauer <s.hauer@...gutronix.de>
> > 
> > With interrupt driven thermal zones we pass the lower and upper
> > temperature on which shall be acted, so in the governor we have to act on
> > the exact lower temperature to be consistent. Otherwise an interrupt maybe
> > generated on the exact lower temperature, but the bang bang governor does
> > not react.
> 
> What is the expected impact on polling driven zones that use bang bang
> after this change?

Polling driven zones may have to be one step cooler before the governor
reacts, otherwise the behaviour should be unaffected.

Sascha

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