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PM / sleep: Do not print debug messages by default

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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>
This commit is contained in:
Rafael J. Wysocki
2017-07-19 02:38:44 +02:00
parent bd8c9ba3b1
commit 8d8b2441db
6 changed files with 91 additions and 25 deletions
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12
Documentation/ABI/testing/sysfs-power
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@@ -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.