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authorAlex Chiang <achiang@hp.com>2009-10-21 23:45:36 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-30 17:59:52 -0400
commite6dcfa7c61c4d31797a12d738bfe0bdec0ca2be1 (patch)
tree276ff03cba0298dce1b790b278f682c84c91797a /Documentation
parent663fb2fc733006f685400fb44551303b72b61a88 (diff)
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>
Diffstat (limited to 'Documentation')
-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:
9 9
10 /sys/devices/system/cpu/cpu#/ 10 /sys/devices/system/cpu/cpu#/
11 11
12What: /sys/devices/system/cpu/sched_mc_power_savings
13 /sys/devices/system/cpu/sched_smt_power_savings
14Date: June 2006
15Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
16Description: Discover and adjust the kernel's multi-core scheduler support.
17
18 Possible values are:
19
20 0 - No power saving load balance (default value)
21 1 - Fill one thread/core/package first for long running threads
22 2 - Also bias task wakeups to semi-idle cpu package for power
23 savings
24
25 sched_mc_power_savings is dependent upon SCHED_MC, which is
26 itself architecture dependent.
27
28 sched_smt_power_savings is dependent upon SCHED_SMT, which
29 is itself architecture dependent.
30
31 The two files are independent of each other. It is possible
32 that one file may be present without the other.
33
34 Introduced by git commit 5c45bf27.
35
12 36
13What: /sys/devices/system/cpu/kernel_max 37What: /sys/devices/system/cpu/kernel_max
14 /sys/devices/system/cpu/offline 38 /sys/devices/system/cpu/offline