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authorMarkus Mayer <mmayer@broadcom.com>2016-11-07 10:02:23 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-11-11 01:51:11 +0100
commitee7930ee27fe5240398cc302fa8eb4454725f188 (patch)
tree4ad6af7f88a71a8238e3e48778876c3fff64f6f5 /Documentation/cpu-freq
parent26f0dbc9ab158afe86bac5ece2fcaf873d6bd8ad (diff)
downloadlwn-ee7930ee27fe5240398cc302fa8eb4454725f188.tar.gz
lwn-ee7930ee27fe5240398cc302fa8eb4454725f188.zip
cpufreq: stats: New sysfs attribute for clearing statistics
Allow CPUfreq statistics to be cleared by writing anything to /sys/.../cpufreq/stats/reset. Signed-off-by: Markus Mayer <mmayer@broadcom.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/cpu-freq')
-rw-r--r--Documentation/cpu-freq/cpufreq-stats.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/cpu-freq/cpufreq-stats.txt b/Documentation/cpu-freq/cpufreq-stats.txt
index 8d9773f23550..3c355f6ad834 100644
--- a/Documentation/cpu-freq/cpufreq-stats.txt
+++ b/Documentation/cpu-freq/cpufreq-stats.txt
@@ -44,11 +44,17 @@ the stats driver insertion.
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