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authorSameer Nanda <snanda@chromium.org>2012-06-19 22:23:33 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-07-01 13:31:22 +0200
commit4b7760ba0dd3319f66886ab2335a0fbecdbc808a (patch)
treef619ead7186c286a5f8c786091af8c46de0decf3 /Documentation/ABI/testing/sysfs-power
parent443772d408a25af62498793f6f805ce3c559309a (diff)
PM / Sleep: add knob for printing device resume times
Added a new knob called /sys/power/pm_print_times. Setting it to 1 enables printing of time taken by devices to suspend and resume. Setting it to 0 disables this printing (unless overridden by initcall_debug kernel command line option). Signed-off-by: Sameer Nanda <snanda@chromium.org> Acked-by: Greg KH <gregkh@linuxfoundation.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-power')
-rw-r--r--Documentation/ABI/testing/sysfs-power13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index 31725ffeeb3a..217772615d02 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -231,3 +231,16 @@ Description:
Reads from this file return a string consisting of the names of
wakeup sources created with the help of /sys/power/wake_lock
that are inactive at the moment, separated with spaces.
+
+What: /sys/power/pm_print_times
+Date: May 2012
+Contact: Sameer Nanda <snanda@chromium.org>
+Description:
+ The /sys/power/pm_print_times file allows user space to
+ control whether the time taken by devices to suspend and
+ resume is printed. These prints are useful for hunting down
+ devices that take too long to suspend or resume.
+
+ Writing a "1" enables this printing while writing a "0"
+ disables it. The default value is "0". Reading from this file
+ will display the current value.