linux-kernel - Re: [PATCH] PM / sleep: add configurable delay for pm

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Message-ID: <20140904071412.GA29832@amd>
Date:	Thu, 4 Sep 2014 09:14:12 +0200
From:	Pavel Machek <pavel@....cz>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	"Rafael J. Wysocki\"" <rjw@...ysocki.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-pm@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] PM / sleep: add configurable delay for pm_test

Hi!

> When CONFIG_PM_DEBUG=y, we provide a sysfs file (/sys/power/pm_test) for
> selecting one of a few suspend test modes, where rather than entering a
> full suspend state, the kernel will perform some subset of suspend
> steps, wait 5 seconds, and then resume back to normal operation.
> 
> This mode is useful for (among other things) observing the state of the
> system just before entering a sleep mode, for debugging or analysis
> purposes. However, a constant 5 second wait is not sufficient for some
> sorts of analysis; for example, on an SoC, one might want to use
> external tools to probe the power states of various on-chip controllers
> or clocks.

When you are doing this kind of analysis, perhaps directly modifying
kernel source is the way to go ...?

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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