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authorRafael J. Wysocki <rjw@sisk.pl>2012-04-29 22:53:22 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-05-01 21:25:38 +0200
commit7483b4a4d9abf9dcf1ffe6e805ead2847ec3264e (patch)
treed03af746dc3be6480580ec569e0c2d708031f0bd /kernel/power/Kconfig
parent6791e36c4a40e8930e08669e60077eea6770c429 (diff)
PM / Sleep: Implement opportunistic sleep, v2
Introduce a mechanism by which the kernel can trigger global transitions to a sleep state chosen by user space if there are no active wakeup sources. It consists of a new sysfs attribute, /sys/power/autosleep, that can be written one of the strings returned by reads from /sys/power/state, an ordered workqueue and a work item carrying out the "suspend" operations. If a string representing the system's sleep state is written to /sys/power/autosleep, the work item triggering transitions to that state is queued up and it requeues itself after every execution until user space writes "off" to /sys/power/autosleep. That work item enables the detection of wakeup events using the functions already defined in drivers/base/power/wakeup.c (with one small modification) and calls either pm_suspend(), or hibernate() to put the system into a sleep state. If a wakeup event is reported while the transition is in progress, it will abort the transition and the "system suspend" work item will be queued up again. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'kernel/power/Kconfig')
-rw-r--r--kernel/power/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index deb5461e3216..67947083f842 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -103,6 +103,14 @@ config PM_SLEEP_SMP
select HOTPLUG
select HOTPLUG_CPU
+config PM_AUTOSLEEP
+ bool "Opportunistic sleep"
+ depends on PM_SLEEP
+ default n
+ ---help---
+ Allow the kernel to trigger a system transition into a global sleep
+ state automatically whenever there are no active wakeup sources.
+
config PM_RUNTIME
bool "Run-time PM core functionality"
depends on !IA64_HP_SIM