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

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Message-Id: <1247794620.26272.213.camel@rzhang-dt>
Date:	Fri, 17 Jul 2009 09:37:00 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Andi Kleen <andi@...stfloor.org>,
	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>
Subject: Re: [PATCH 0/8] device async action mechanism

On Thu, 2009-07-16 at 21:45 +0800, Arjan van de Ven wrote:
> Henrique de Moraes Holschuh wrote:
> > On Thu, 16 Jul 2009, Zhang Rui wrote:
> >> the kernel device suspend time is reduced from 3.2s to 2.8s after
> >> applying this patch set in my test box.
> > 
> > It will give even a bigger boot time saving on ThinkPads, where there is a
> > Synaptics (or ALPS if you are unlucky) touchpad with the trackpoint behind
> > it... it takes about 2s to init both devices here.  That's two seconds of
> > boot time you can shove off if it is being initialized assyncronously :-)
> > 
> 
> that's a different problem that I don't think this will solve;

right.
we are not able to get an async device group during initialization.

thanks,
rui

>  as long
> as you keep the boot of the kernel wait for all async actions, you're going
> to hit that wait. In Moblin we have a (bad) patch to not do the wait,
> at some point we need to figure how to get a mainline-able patch....

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