linux-kernel - Re: [RFC][PATCH 0/7] PM: Asynchronous suspend and resume (updated)

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Date:	Tue, 18 Aug 2009 15:16:33 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Greg KH <gregkh@...e.de>
Subject: Re: [RFC][PATCH 0/7] PM: Asynchronous suspend and resume (updated)

On Mon, 2009-08-17 at 08:15 +0800, Rafael J. Wysocki wrote:
> On Wednesday 12 August 2009, Rafael J. Wysocki wrote:
> > Hi,
> > 
> > The following patches introduce a mechanism allowing us to execute device
> > drivers' suspend and resume callbacks asynchronously during system sleep
> > transitions, such as suspend to RAM.  The idea is explained in the [1/1] patch
> > message.
> 
> Changes:
> 
> * Added [1/7] that fixes kerneldoc comments in drivers/base/power/main.c
>   (this is a 2.6.32 candidate).
> 
> * Added [2/7] adding a framework for representing PM link (idea described
>   in the patch message).
> 
> * [3/7] is the async resume patch (idea described in the patch message).
> 
> * [4/7] is the async suspend patch.
> 
> * [5/7] - [7/7] set async_suspend for devices in a few selected subsystems.
> 
> The patches have been tested on HP nx6325.
> 
I tried this patch set and it does work. :)
But unfortunately it doesn't save too much time.

I still think that the child device should inherit its parent's
async_suspend flag to do the asynchronous resume more efficiently.

or at least we should provide such an interface
in drivers/base/power/common.c, so that device can tell the device core
to inherit this flag if there is no off-tree dependency.

thanks,
rui

> Thanks,
> Rafael
> 

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