linux-kernel - Re: [PATCH V2 0/4] introduce device async actions mechanism

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Message-Id: <200908042044.41170.rjw@sisk.pl>
Date:	Tue, 4 Aug 2009 20:44:40 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pm" <linux-pm@...ts.linux-foundation.org>,
	"linux-acpi" <linux-acpi@...r.kernel.org>,
	Pavel Machek <pavel@....cz>, Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"dtor@...l.ru" <dtor@...l.ru>
Subject: Re: [PATCH V2 0/4] introduce device async actions mechanism

On Tuesday 04 August 2009, Alan Stern wrote:
> On Tue, 4 Aug 2009, Rafael J. Wysocki wrote:
> 
> > Not only that.  I'd like to simplify the design, because IMO using one async
> > domain would be much more straightforward than using multiple ones.
> 
> > If I understand the async framework correctly, the domains are only used for
> > synchronization, ie. if you want to wait for a group of async operations to
> > complete, you can put them all into one domain and then call
> > async_synchronize_full_domain() to wait for them all together.
> > 
> > You don't need multiple domains to run multiple things in parallel.
> 
> There's a basic confusion going on here.
> 
> Rui is using "async domain" to mean a collection of devices which 
> will be suspended or resumed serially.  Different domains run in 
> parallel.
> 
> Rafael is using "async domain" to mean a collection of devices which 
> will be suspended or resumed in parallel.  Different domains run 
> serially.
> 
> Once that is cleared up, you should be able to communicate a little 
> better...  :-)

Well, I tried to follow the naming convention of kernel/async.c.

Best,
Rafael
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