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.4.44L0.0912192253200.6618-100000@netrider.rowland.org>
Date:	Sat, 19 Dec 2009 22:59:06 -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:

> So, seriously, do you think it makes sense to do asynchronous suspend at all?
> I'm asking, because we're likely to get into troubles like this during suspend
> for other kinds of devices too and without resolving them we won't get any
> significant speedup from asynchronous suspend.
> 
> That said, to me it's definitely worth doing asynchronous resume with the
> "start asynch threads upfront" modification, as the results of the tests show
> that quite clearly.  I hope you agree.

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.

Alan Stern

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