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

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Date:	Thu, 17 Dec 2009 02:30:24 +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 Thursday 17 December 2009, Rafael J. Wysocki wrote:
> On Thursday 17 December 2009, Alan Stern wrote:
> > On Wed, 16 Dec 2009, Rafael J. Wysocki wrote:
> > 
> > > I've just put the first set of data, for the HP nx6325 at:
> > > http://www.sisk.pl/kernel/data/nx6325/
> > >  
> > > The *-dmesg.log files contain full dmesg outputs starting from a cold boot and
> > > including one suspend-resume cycle in each case, with debug_initcall enabled.
> > > 
> > > The *-suspend.log files are excerpts from the *-dmesg.log files containing
> > > the suspend messages only, and analogously for *-resume.log.
> > 
> > I've just started looking at the sync-suspend.log file.  What are all 
> > the '+' characters and " @ 3368" strings after the device names?
> 
> I think the + is necessary for the Arjan's graph-generating script and the
> @ number is the value of current (ie. the PID of the calling task).
> 
> > You didn't print out the parent name for each device, so the tree 
> > structure has been lost.
> 
> That's because the original Arjan's patch doesn't do that, I'm adding it
> right now.
> 
> > Why do those "sd 0:0:0:0 [sda]" messages appear in between two 
> > callbacks?  The cache-synchronization and the spin-down commands are
> > not executed asynchronously.
> 
> Because the data are incomplete.  :-(
> 
> I've just realized that the Arjan's patch only covers bus types and classes
> that have been converted to dev_pm_ops already, so I'm extending it to the
> "legacy" ones at the moment.

New data files have been uploaded to:

http://www.sisk.pl/kernel/data/nx6325/
http://www.sisk.pl/kernel/data/wind/

Please let me know if you need more information.

Rafael
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