path: root/Documentation/cpu-freq
diff options
authorKristen Carlson Accardi <>2015-01-28 15:03:28 -0800
committerRafael J. Wysocki <>2015-01-30 01:52:17 +0100
commit0522424ecb333c0874c4e74bc053dd662bed40df (patch)
tree2d04b3435d5b078c906a52272723546a8bc45545 /Documentation/cpu-freq
parentd01b1f48c5fd95901203bd830458eaf619ed6c47 (diff)
intel_pstate: Add num_pstates to sysfs
Add a sysfs interface to display the total number of supported pstates. This value is independent of whether turbo has been enabled or disabled. Signed-off-by: Kristen Carlson Accardi <> Signed-off-by: Rafael J. Wysocki <>
Diffstat (limited to 'Documentation/cpu-freq')
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt
index 7767ce6756be..655750743fb0 100644
--- a/Documentation/cpu-freq/intel-pstate.txt
+++ b/Documentation/cpu-freq/intel-pstate.txt
@@ -41,6 +41,10 @@ controlling P state selection. These files have been added to
is supported by hardware that is in the turbo range. This number
is independent of whether turbo has been disabled or not.
+ num_pstates: displays the number of pstates that are supported
+ by hardware. This number is independent of whether turbo has
+ been disabled or not.
For contemporary Intel processors, the frequency is controlled by the
processor itself and the P-states exposed to software are related to
performance levels. The idea that frequency can be set to a single