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authorBrian Norris <computersforpeace@gmail.com>2015-02-22 21:16:49 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-02-26 01:21:26 +0100
commit1d4a9c17d4d204a159139361e8d4db7f9f267879 (patch)
treea419a5a715a3506e7972b556591b252f3b6ee10b /include/linux/pm-trace.h
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
PM / sleep: add configurable delay for pm_test
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. This patch turns this 5 second delay into a configurable module parameter, so users can determine how long to wait in this pseudo-suspend state before resuming the system. Example (wait 30 seconds); # echo 30 > /sys/module/suspend/parameters/pm_test_delay # echo core > /sys/power/pm_test # time echo mem > /sys/power/state ... [ 17.583625] suspend debug: Waiting for 30 second(s). ... real 0m30.381s user 0m0.017s sys 0m0.080s Signed-off-by: Brian Norris <computersforpeace@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Kevin Cernekee <cernekee@chromium.org> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/pm-trace.h')
0 files changed, 0 insertions, 0 deletions