thinkpad-acpi: bump up version to 0.23

[safe/jmp/linux-2.6] / Documentation / cpu-freq / user-guide.txt

diff --git a/Documentation/cpu-freq/user-guide.txt b/Documentation/cpu-freq/user-guide.txt
index e3443dd..75f4119 100644 (file)
--- a/Documentation/cpu-freq/user-guide.txt
+++ b/Documentation/cpu-freq/user-guide.txt
@@ -152,6 +152,18 @@ cpuinfo_min_freq :         this file shows the minimum operating
                                frequency the processor can run at(in kHz) 
 cpuinfo_max_freq :             this file shows the maximum operating
                                frequency the processor can run at(in kHz) 
+cpuinfo_transition_latency     The time it takes on this CPU to
+                               switch between two frequencies in nano
+                               seconds. If unknown or known to be
+                               that high that the driver does not
+                               work with the ondemand governor, -1
+                               (CPUFREQ_ETERNAL) will be returned.
+                               Using this information can be useful
+                               to choose an appropriate polling
+                               frequency for a kernel governor or
+                               userspace daemon. Make sure to not
+                               switch the frequency too often
+                               resulting in performance loss.
 scaling_driver :               this file shows what cpufreq driver is
                                used to set the frequency on this CPU
 
@@ -195,19 +207,3 @@ scaling_setspeed.          By "echoing" a new frequency into this
                                you can change the speed of the CPU,
                                but only within the limits of
                                scaling_min_freq and scaling_max_freq.
-                               
-
-3.2 Deprecated Interfaces
--------------------------
-
-Depending on your kernel configuration, you might find the following 
-cpufreq-related files:
-/proc/cpufreq
-/proc/sys/cpu/*/speed
-/proc/sys/cpu/*/speed-min
-/proc/sys/cpu/*/speed-max
-
-These are files for deprecated interfaces to cpufreq, which offer far
-less functionality. Because of this, these interfaces aren't described
-here.
-