From: Pavel Machek <pavel@ucw.cz>
To: Brian Norris <computersforpeace@gmail.com>
Cc: "Rafael J. Wysocki\"" <rjw@rjwysocki.net>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-pm@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: Re: [PATCH] PM / sleep: add configurable delay for pm_test
Date: Thu, 4 Sep 2014 09:14:12 +0200 [thread overview]
Message-ID: <20140904071412.GA29832@amd> (raw)
In-Reply-To: <1409788535-28264-1-git-send-email-computersforpeace@gmail.com>
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
next prev parent reply other threads:[~2014-09-04 7:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-03 23:55 [PATCH] PM / sleep: add configurable delay for pm_test Brian Norris
2014-09-03 23:55 ` Brian Norris
2014-09-04 7:14 ` Pavel Machek [this message]
2014-09-04 17:54 ` Brian Norris
2014-09-05 2:11 ` Chirantan Ekbote
2014-12-13 2:55 ` Brian Norris
2014-12-13 8:31 ` Pavel Machek
2014-12-16 23:58 ` Brian Norris
2014-12-17 8:09 ` Pavel Machek
2014-12-17 9:10 ` Brian Norris
2014-12-17 9:10 ` Brian Norris
2014-12-17 9:22 ` Pavel Machek
2015-02-21 20:25 ` Florian Fainelli
2015-02-21 20:32 ` Pavel Machek
2015-02-21 22:56 ` Florian Fainelli
2015-02-21 23:24 ` Pavel Machek
2015-02-22 8:23 ` Brian Norris
2015-02-22 8:26 ` [PATCH v2] " Brian Norris
2015-02-22 12:27 ` Pavel Machek
2015-02-22 15:17 ` Kevin Cernekee
2015-02-22 19:25 ` Florian Fainelli
2015-02-23 5:16 ` [PATCH v3] " Brian Norris
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