linux-kernel - [PATCH 5/7] Documentation: ABI: /sys/devices/system/cpu/sched_[mc|smt]_power

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Message-ID: <20091022034536.13399.98197.stgit@bob.kio>
Date:	Wed, 21 Oct 2009 21:45:36 -0600
From:	Alex Chiang <achiang@...com>
To:	randy.dunlap@...cle.com, greg@...ah.com
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, rientjes@...gle.com
Subject: [PATCH 5/7] 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@...el.com>
Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Alex Chiang <achiang@...com>
---

 Documentation/ABI/testing/sysfs-devices-system-cpu |   24 ++++++++++++++++++++
 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 2ade5c0..8cdda1c 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@...r.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

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