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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-19 03:38:44 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-22 03:31:27 +0300 |
| commit | 8d8b2441db9647890251538f60b75a4e45fdef8d (patch) | |
| tree | 57f0acb27062c75ece6982231b81d67f7909f834 /Documentation/ABI | |
| parent | bd8c9ba3b1e2037af5af4e48aea1087212838179 (diff) | |
| download | linux-8d8b2441db9647890251538f60b75a4e45fdef8d.tar.xz | |
PM / sleep: Do not print debug messages by default
Debug messages from the system suspend/hibernation infrastructure can
fill up the entire kernel log buffer in some cases and anyway they
are only useful for debugging. They depend on CONFIG_PM_DEBUG, but
that is set as a rule as some generally useful diagnostic facilities
depend on it too.
For this reason, avoid printing those messages by default, but make
it possible to turn them on as needed with the help of a new sysfs
attribute under /sys/power/.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-power | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power index f523e5a3ac33..713cab1d5f12 100644 --- a/Documentation/ABI/testing/sysfs-power +++ b/Documentation/ABI/testing/sysfs-power @@ -273,3 +273,15 @@ Description: This output is useful for system wakeup diagnostics of spurious wakeup interrupts. + +What: /sys/power/pm_debug_messages +Date: July 2017 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/power/pm_debug_messages file controls the printing + of debug messages from the system suspend/hiberbation + infrastructure to the kernel log. + + Writing a "1" to this file enables the debug messages and + writing a "0" (default) to it disables them. Reads from + this file return the current value. |