linux-kernel - Re: Async suspend-resume patch w/ completions (was: Re: Async suspend-resume patch w/ rwsems)

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Message-ID: <Pine.LNX.4.44L0.0912201210300.24162-100000@netrider.rowland.org>
Date:	Sun, 20 Dec 2009 12:12:09 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Zhang Rui <rui.zhang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: Async suspend-resume patch w/ completions (was: Re: Async
 suspend-resume patch w/ rwsems)

On Sun, 20 Dec 2009, Rafael J. Wysocki wrote:

> > It's too early to come to this sort of conclusion (i.e., that suspend
> > and resume react very differently to an asynchronous approach).  Unless
> > you have some definite _reason_ for thinking that resume will benefit
> > more than suspend, you shouldn't try to generalize so much from tests
> > on only two systems.
> 
> In fact I have one reason.  Namely, the things that drivers do on suspend and
> resume are evidently quite different and on these two systems I was able to
> test they apparently took different amounts of time to complete.
> 
> The very fact that on both systems resume is substantially longer than suspend,
> even if all devices are suspended and resumed synchronously, is quite
> interesting.

Yes, it is.  But it doesn't mean that suspend won't benefit from 
asynchronicity; it just means that the benefits might not be as large 
as they are for resume.

Alan Stern

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