docs: cpu-freq: convert cpufreq-stats.txt to ReST

- Add a SPDX header;
- Add a document title, based on the original contents of
  cpu-freq/index.txt;
- Use lists where needed;
- Comment out the existing text-only index;
- Adjust some title marks;
- Use bold on some places;
- Mark literal blocks as such;
- Some whitespace fixes and new line breaks;
- Add it to cpu-freq/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 127 deletions

diff --git a/Documentation/cpu-freq/cpufreq-stats.txt b/Documentation/cpu-freq/cpufreq-stats.txt
deleted file mode 100644
index 14378cecb172..000000000000
--- a/Documentation/cpu-freq/cpufreq-stats.txt
+++ /dev/null
@@ -1,127 +0,0 @@
-
-     CPU frequency and voltage scaling statistics in the Linux(TM) kernel
-
-
-             L i n u x    c p u f r e q - s t a t s   d r i v e r
-
-                       - information for users -
-
-
-             Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
-
-Contents
-1. Introduction
-2. Statistics Provided (with example)
-3. Configuring cpufreq-stats
-
-
-1. Introduction
-
-cpufreq-stats is a driver that provides CPU frequency statistics for each CPU.
-These statistics are provided in /sysfs as a bunch of read_only interfaces. This
-interface (when configured) will appear in a separate directory under cpufreq
-in /sysfs (<sysfs root>/devices/system/cpu/cpuX/cpufreq/stats/) for each CPU.
-Various statistics will form read_only files under this directory.
-
-This driver is designed to be independent of any particular cpufreq_driver
-that may be running on your CPU. So, it will work with any cpufreq_driver.
-
-
-2. Statistics Provided (with example)
-
-cpufreq stats provides following statistics (explained in detail below).
--  time_in_state
--  total_trans
--  trans_table
-
-All the statistics will be from the time the stats driver has been inserted
-(or the time the stats were reset) to the time when a read of a particular
-statistic is done. Obviously, stats driver will not have any information
-about the frequency transitions before the stats driver insertion.
-
---------------------------------------------------------------------------------
-<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # ls -l
-total 0
-drwxr-xr-x  2 root root    0 May 14 16:06 .
-drwxr-xr-x  3 root root    0 May 14 15:58 ..
---w-------  1 root root 4096 May 14 16:06 reset
--r--r--r--  1 root root 4096 May 14 16:06 time_in_state
--r--r--r--  1 root root 4096 May 14 16:06 total_trans
--r--r--r--  1 root root 4096 May 14 16:06 trans_table
---------------------------------------------------------------------------------
-
--  reset
-Write-only attribute that can be used to reset the stat counters. This can be
-useful for evaluating system behaviour under different governors without the
-need for a reboot.
-
--  time_in_state
-This gives the amount of time spent in each of the frequencies supported by
-this CPU. The cat output will have "<frequency> <time>" pair in each line, which
-will mean this CPU spent <time> usertime units of time at <frequency>. Output
-will have one line for each of the supported frequencies. usertime units here 
-is 10mS (similar to other time exported in /proc).
-
---------------------------------------------------------------------------------
-<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat time_in_state 
-3600000 2089
-3400000 136
-3200000 34
-3000000 67
-2800000 172488
---------------------------------------------------------------------------------
-
-
--  total_trans
-This gives the total number of frequency transitions on this CPU. The cat 
-output will have a single count which is the total number of frequency
-transitions.
-
---------------------------------------------------------------------------------
-<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat total_trans
-20
---------------------------------------------------------------------------------
-
--  trans_table
-This will give a fine grained information about all the CPU frequency
-transitions. The cat output here is a two dimensional matrix, where an entry
-<i,j> (row i, column j) represents the count of number of transitions from 
-Freq_i to Freq_j. Freq_i rows and Freq_j columns follow the sorting order in
-which the driver has provided the frequency table initially to the cpufreq core
-and so can be sorted (ascending or descending) or unsorted.  The output here
-also contains the actual freq values for each row and column for better
-readability.
-
-If the transition table is bigger than PAGE_SIZE, reading this will
-return an -EFBIG error.
-
---------------------------------------------------------------------------------
-<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat trans_table
-   From  :    To
-         :   3600000   3400000   3200000   3000000   2800000 
-  3600000:         0         5         0         0         0 
-  3400000:         4         0         2         0         0 
-  3200000:         0         1         0         2         0 
-  3000000:         0         0         1         0         3 
-  2800000:         0         0         0         2         0 
---------------------------------------------------------------------------------
-
-
-3. Configuring cpufreq-stats
-
-To configure cpufreq-stats in your kernel
-Config Main Menu
-	Power management options (ACPI, APM)  --->
-		CPU Frequency scaling  --->
-			[*] CPU Frequency scaling
-			[*]   CPU frequency translation statistics
-
-
-"CPU Frequency scaling" (CONFIG_CPU_FREQ) should be enabled to configure
-cpufreq-stats.
-
-"CPU frequency translation statistics" (CONFIG_CPU_FREQ_STAT) provides the
-statistics which includes time_in_state, total_trans and trans_table.
-
-Once this option is enabled and your CPU supports cpufrequency, you
-will be able to see the CPU frequency statistics in /sysfs.