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1d4a9c17d4
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> |
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| .. | ||
| powercap | ||
| regulator | ||
| 00-INDEX | ||
| apm-acpi.txt | ||
| basic-pm-debugging.txt | ||
| charger-manager.txt | ||
| devices.txt | ||
| drivers-testing.txt | ||
| freezing-of-tasks.txt | ||
| interface.txt | ||
| notifiers.txt | ||
| opp.txt | ||
| pci.txt | ||
| pm_qos_interface.txt | ||
| power_supply_class.txt | ||
| runtime_pm.txt | ||
| s2ram.txt | ||
| states.txt | ||
| suspend-and-cpuhotplug.txt | ||
| suspend-and-interrupts.txt | ||
| swsusp-and-swap-files.txt | ||
| swsusp-dmcrypt.txt | ||
| swsusp.txt | ||
| tricks.txt | ||
| userland-swsusp.txt | ||
| video.txt | ||