linux-kernel - Re: [Bug #13306] hibernate slow on _second

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Message-Id: <200906012248.49304.rjw@sisk.pl>
Date:	Mon, 1 Jun 2009 22:48:48 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #13306] hibernate slow on _second_ run

On Monday 01 June 2009, Johannes Berg wrote:
> On Mon, 2009-06-01 at 22:26 +0200, Rafael J. Wysocki wrote:
> > On Sunday 31 May 2009, Johannes Berg wrote:
> > > On Sat, 2009-05-30 at 21:37 +0200, Rafael J. Wysocki wrote:
> > > > This message has been generated automatically as a part of a report
> > > > of recent regressions.
> > > > 
> > > > The following bug entry is on the current list of known regressions
> > > > from 2.6.29.  Please verify if it still should be listed and let me know
> > > > (either way).
> > > > 
> > > > 
> > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13306
> > > > Subject		: hibernate slow on _second_ run
> > > > Submitter	: Johannes Berg <johannes@...solutions.net>
> > > > Date		: 2009-05-14 09:34 (17 days old)
> > > 
> > > I'm trying to get an ftrace profile that covers the point in question,
> > > but it might take me a couple of days.
> > 
> > Did it work?
> 
> No, it's now hanging 20 seconds much later, after returning to
> userspace :( But the dmesg log still has a hang of ~20.5 seconds just
> like before, between two kernel messages...

Hmm.  Can you try to comment out suspend_device_irqs() and resume_device_irqs()
in drivers/base/power/main.c and see what happens?

Rafael
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