linux-kernel - Re: [GIT PULL] PM updates for 2.6.33

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Message-Id: <200912060226.06217.rjw@sisk.pl>
Date:	Sun, 6 Dec 2009 02:26:06 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [GIT PULL] PM updates for 2.6.33

On Sunday 06 December 2009, Arjan van de Ven wrote:
> On Sun, 6 Dec 2009 00:55:36 +0100
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > 
> > Disk spinup/spindown takes time, but also some ACPI devices resume
> > slowly, serio devices do that too and there are surprisingly many
> > drivers that wait (using msleep() during suspend and resume).  Apart
> > from this, every PCI device going from D0 to D3 during suspend and
> > from D3 to D0 during resume requires us to sleep for 10 ms (the
> > sleeping is done by the PCI core, so the drivers don't even realize
> > its there).
> 
> maybe a good step is to make a scripts/bootgraph.pl equivalent for
> suspend/resume (or make a debug mode that outputs in a compatible format
> so that the script can be used as is.. I don't mind either way, and
> consider this my offer to help with such a script as long as there's
> sufficient logging in dmesg ;-)

OK, so what kind of logging is needed?

> that way we can SEE which ones are an issue.... and by how much.

Well, why not.

Thanks,
Rafael
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