linux-kernel - Re: [PATCH 0/8] device async action mechanism

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Date:	Fri, 17 Jul 2009 09:40:13 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 0/8] device async action mechanism

On Wed, 2009-07-15 at 08:29 +0800, Pavel Machek wrote:
> Hi!
> 
> I notice you are still ccing my @suse.cz address. That one no longer
> works :-(. 
> 
> > this is the patch set I made to speed up the device
> > suspend/resume/shutdown process.
> > 
> > A new mechanism called Device Async Actions is introduced in this patch set.
> > The basic idea is that,
> > 1. device declares to support certain kinds of device async action,
> >    like suspend, resume, shutdown, etc.
> > 2. a async domain is create for this device
> > 3. the child device inherits the async domain
> > 4. devices in the same domain suspend/resume/shutdown asynchronously with
> >    the other devices.
> > 
> > Currently, in order to make sure that it won't bring any side effects,
> > I only convert the ACPI battery and i8042 to use this framework, which reduces
> > 0.5s+ S3 time(suspend time plus resume time)???, from 7.0s to less than 6.5s.
> > and about 0.5s shutdown time in my test.
> 
> Hmm, 7seconds is still quite long. What hw is that?
> 
7 seconds including both kernel suspend and resume time.
it takes about 3.2s to suspend and 3.8 seconds to resume.

thanks,
rui

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