Merge branch 'for-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

[deliverable/linux.git] / kernel / power / Kconfig

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 9c39de095ba905558d2f032278f63efa9d3ad081..d444c4e834f4526ec318f71b1076a02c909e34a8 100644 (file)
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -262,6 +262,26 @@ config PM_GENERIC_DOMAINS
        bool
        depends on PM
 
+config WQ_POWER_EFFICIENT_DEFAULT
+       bool "Enable workqueue power-efficient mode by default"
+       depends on PM
+       default n
+       help
+         Per-cpu workqueues are generally preferred because they show
+         better performance thanks to cache locality; unfortunately,
+         per-cpu workqueues tend to be more power hungry than unbound
+         workqueues.
+
+         Enabling workqueue.power_efficient kernel parameter makes the
+         per-cpu workqueues which were observed to contribute
+         significantly to power consumption unbound, leading to measurably
+         lower power usage at the cost of small performance overhead.
+
+         This config option determines whether workqueue.power_efficient
+         is enabled by default.
+
+         If in doubt, say N.
+
 config PM_GENERIC_DOMAINS_SLEEP
        def_bool y
        depends on PM_SLEEP && PM_GENERIC_DOMAINS