linux-kernel - Re: [PATCH 1/3] PM / Runtime: Update documentation of interactions with system sleep

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Message-ID: <alpine.LNX.2.00.1106260055270.23991@swampdragon.chaosbits.net>
Date:	Sun, 26 Jun 2011 00:58:41 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Kevin Hilman <khilman@...com>, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/3] PM / Runtime: Update documentation of interactions
 with system sleep

On Sun, 26 Jun 2011, Rafael J. Wysocki wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 

A few tiny nit-picks..

> The documents describing the interactions between runtime PM and
> system sleep generally refer to the model in which the system sleep
> state is entered through a global firmware or hardware operation.
> As a result, some recommendations given in there are not entirely
> suitable for systems in which this is not the case.  Update the
> documentation take the existence of those systems into accout.
> 

I believe this should read "... documentation to take the existence of 
those systems ..."


<...>
>  
> +On some systems, however, system sleep is not entered through a global firmware
> +or hardware operation.  Instead, all hardware components are put into low-power
> +states directly by the kernel in a coordinated way.  Then, the system sleep
> +state effectively follows from the states the hardware components end up in
> +and the system is woken up from that state by a hardware interrupt or a similar
> +mechanism entirely under the kernel's control.  As a result, the kernel never
> +gives control away and the states of all devices during resume are precisely
> +known to it.  If that is the case and none of the situations listed above takes
> +place (in particular, if the system is not waking up from hibernation), it may
> +be more efficient to leave the devices that had been suspended before the system
> +suspend began in the suspended state.
> +

You are refering to device*s*, so I believe this last bit should be "... 
in the suspended states".

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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