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

[linux-imx.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 2fe6e767b3d6013f3d1023c2e518b0466fa27e2f..81732b8abd3afe45acbfd6d9dfa26afd2c8ed730 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3341,6 +3341,21 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        that this also can be controlled per-workqueue for
                        workqueues visible under /sys/bus/workqueue/.
 
+       workqueue.power_efficient
+                       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 this 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.
+
+                       The default value of this parameter is determined by
+                       the config option CONFIG_WQ_POWER_EFFICIENT_DEFAULT.
+
        x2apic_phys     [X86-64,APIC] Use x2apic physical mode instead of
                        default x2apic cluster mode on platforms
                        supporting x2apic.