linux-kernel - Re: [RFC][PATCH 1/3] Suspend: Testing facility

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Date:	Sat, 3 Nov 2007 19:54:00 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [RFC][PATCH 1/3] Suspend: Testing facility

Hi,

On Saturday, 3 November 2007 19:23, Pavel Machek wrote:
> Hi!
> 
> > Introduce /sys/power/pm_test_level attribute allowing one to test the suspend
> > core code.  Namely, writing a number (1-5) to this file causes the suspend code
> > to work in one of the test modes defined as follows:
> > 
> > 5 - test the freezing of processes
> > 4 - test the freezing of processes and suspending of devices
> > 3 - test the freezing of processes, suspending of devices and platform global
> >     control methods
> > 2 - test the freezing of processes, suspending of devices, platform global
> >     control methods and the disabling of nonboot CPUs
> > 1 - test the freezing of processes, suspending of devices, platform global
> >     control methods, the disabling of nonboot CPUs and suspending of
> >     platform/system devices
> > 
> > Then, if a suspend is started by normal means, the suspend core will perform
> > its normal operations up to the point indicated by the test level.  Next, it
> > will wait for 5 seconds and carry out the resume operations needed to transition
> > the system back to the fully functional state.
> > 
> > Writing 0 to /sys/power/pm_test_level turns the testing off.  The current test
> > level may be read from /sys/power/pm_test_level .
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> 
> ACK on whole series, but... should we also remove the old debugging
> infrastructure? (Or did I just miss it?)

Well, I don't want to remove it just yet, but it's going to be deprecated.

Also, after Johannes' remark I thought it wouldn't be a good idea to export the
bare test levels to the user.  For this reason I reworked the patches to use
strings instead of numbers for the test setting (the attribute is now called
"pm_test" and is used in a similar way to "disk").

I'll post the reworked series as soon as I update the changelogs and docs.

Greetings,
Rafael
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