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authorAlex Chiang <achiang@hp.com>2009-10-22 07:45:36 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-31 00:59:52 +0300
commite6dcfa7c61c4d31797a12d738bfe0bdec0ca2be1 (patch)
tree276ff03cba0298dce1b790b278f682c84c91797a
parent663fb2fc733006f685400fb44551303b72b61a88 (diff)
downloadlinux-e6dcfa7c61c4d31797a12d738bfe0bdec0ca2be1.tar.xz
Documentation: ABI: /sys/devices/system/cpu/sched_[mc|smt]_power_savings
Document sched_[mc|smt]_power_savings by reading existing code and git logs. Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-cpu24
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 2ade5c0809a0..8cdda1c56980 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -9,6 +9,30 @@ Description:
/sys/devices/system/cpu/cpu#/
+What: /sys/devices/system/cpu/sched_mc_power_savings
+ /sys/devices/system/cpu/sched_smt_power_savings
+Date: June 2006
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description: Discover and adjust the kernel's multi-core scheduler support.
+
+ Possible values are:
+
+ 0 - No power saving load balance (default value)
+ 1 - Fill one thread/core/package first for long running threads
+ 2 - Also bias task wakeups to semi-idle cpu package for power
+ savings
+
+ sched_mc_power_savings is dependent upon SCHED_MC, which is
+ itself architecture dependent.
+
+ sched_smt_power_savings is dependent upon SCHED_SMT, which
+ is itself architecture dependent.
+
+ The two files are independent of each other. It is possible
+ that one file may be present without the other.
+
+ Introduced by git commit 5c45bf27.
+
What: /sys/devices/system/cpu/kernel_max
/sys/devices/system/cpu/offline