linux-kernel - Re: [PATCH 2/6] PM: Asynchronous resume of devices

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Message-ID: <Pine.LNX.4.44L0.0908292043500.26533-100000@netrider.rowland.org>
Date:	Sat, 29 Aug 2009 20:48:51 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	linux-pm <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	Pavel Machek <pavel@....cz>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 2/6] PM: Asynchronous resume of devices

On Sat, 29 Aug 2009, Rafael J. Wysocki wrote:

> I only wanted to say that the advantage is not really that "big". :-)
> 
> > I must agree, 14 threads isn't a lot.  But at the moment that number is 
> > random, not under your control.
> 
> It's not directly controlled, but there are some interactions between the
> async threads, the main threads and the async framework that don't allow this
> number to grow too much.
> 
> IMO it sometimes is better to allow things to work themselves out, as long as
> they don't explode, than to try to keep everything under strict control.  YMMV.

For testing purposes it would be nice to have a one-line summary for
each device containing a thread ID, start timestamp, end timestamp, and
elapsed time.  With that information you could evaluate the amount of
parallelism and determine where the bottlenecks are.  It would give a
much more detailed picture of the entire process than the total time of
your recent patch 9.

Alan Stern


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