linux-kernel - Re: [PATCH] PM / suspend: Always use deepest C-state in the "freeze" sleep state

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Message-ID: <2485687.UrJORvS9e7@vostro.rjw.lan>
Date:	Fri, 09 May 2014 13:26:47 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Aubrey Li <aubrey.li@...el.com>
Subject: Re: [PATCH] PM / suspend: Always use deepest C-state in the "freeze" sleep state

On Friday, May 09, 2014 09:38:35 AM Pavel Machek wrote:
> On Mon 2014-05-05 00:51:54, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > 
> > If freeze_enter() is called, we want to bypass the current cpuidle
> > governor and always use the deepest available (that is, not disabled)
> > C-state, because we want to save as much energy as reasonably possible
> > then and runtime latency constraints don't matter at that point, since
> > the system is in a sleep state anyway.
> 
> Would there be way to pass the parameter "go to deepest" instead of adding
> global state for this?

I'm not sure what you mean?  A parameter of what in particular?  And where
to pass it?

Rafael

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