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

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Message-Id: <200912162026.00991.rjw@sisk.pl>
Date:	Wed, 16 Dec 2009 20:26:00 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 Wednesday 16 December 2009, Alan Stern wrote:
> On Wed, 16 Dec 2009, Rafael J. Wysocki wrote:
> 
> > I measured the total time of suspending and resuming devices as shown by the
> > code added by this patch:
> > http://git.kernel.org/?p=linux/kernel/git/rafael/suspend-2.6.git;a=commitdiff_plain;h=c1b8fc0a8bff7707c10f31f3d26bfa88e18ccd94;hp=087dbf5f079f1b55cbd3964c9ce71268473d5b67
> > on two boxes, HP nx6325 and MSI Wind U100 (hardware-wise they are quite
> > different and the HP was running 64-bit kernel and user space).
> 
> > I carried out 5 consecutive suspend-resume cycles (started from under X) on
> > each box in each case, and the raw data are here (all times in milliseconds):
> > http://www.sisk.pl/kernel/data/async-suspend.pdf
> 
> I'd like to see much more detailed data.  For each device, let's get 
> the device name, the parent's name, and the start time, end time, and 
> duration for suspend or resume.  The start time should be measured when 
> you have finished waiting for the children.  The end time should be 
> measured just before the complete_all().

I'm going to use the Arjan's patch + script to chart the suspend/resume times
for individual devices.  I can send you the raw data, though.

Rafael
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