linux-kernel - Re: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume

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Date:	Thu, 13 Aug 2009 23:53:54 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
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>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume

On Wednesday 12 August 2009, Rafael J. Wysocki wrote:
> On Wednesday 12 August 2009, Alan Stern wrote:
> > On Wed, 12 Aug 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.
> > > 
> > > Comments welcome.
> > 
> > I get the idea.  Not bad.
> 
> Thanks!
> 
> > Have you tried it in a serious way?  For example, turning on the
> > async_suspend flag for every device?
> 
> No, I've only tested it with a few selected drivers.  I'm going to try the
> "async everyone" scenario, though.

On HP nx6325 booted with init=/bin/bash it doesn't pass the
'echo devices > /sys/power/pm_test && echo mem > /sys/power/state' test.

The suspend part actually seems to work, but the resume part crashes
miserably.

Thanks,
Rafael
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