PM / sleep: Add pm_debug_messages boot command control
Subsystems (2)
PATCH 1/1 PM / sleep: Add pm_debug_messages boot command control
Debug messages from the system suspend/hibernation infrastructure is disabled by default, and can only be enabled after the system has boot up via /sys/power/pm_debug_messages. This makes the hibernation resume hard to track as it involves system boot up across hibernation. There's no chance for software_resume() to track the resume process, eg.
Turning on the pm_debug_messages during boot up by appending 'pm_debug_message'.
--- kernel/power/main.c | 7 +++++++ 1 file changed, 7 insertions(+)
kernel/power/main.c +7 -0
@@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj,power_attr (pm_debug_messages); +static int __init pm_debug_message_setup (char *str) +{ + pm_debug_messages_on = true; +return 1 ; +} +__setup ("pm_debug_message" , pm_debug_message_setup); +/** * __pm_pr_dbg - Print a suspend debug message to the kernel log. * @defer: Whether or not to use printk_deferred() to print the message.
Signature · 1 line
2.17.1
Quoted 9 lines · Chen Yu
Debug messages from the system suspend/hibernation infrastructure is disabled by default, and can only be enabled after the system has boot up via
/sys/power/pm_debug_messages. This makes the hibernation resume hard to track as it involves system boot up across hibernation. There's no chance forsoftware_resume()to track the resume process, eg.Turning on the
pm_debug_messagesduring boot up by appending 'pm_debug_message'.
Please add that command line option toDocumentation/admin-guide/kernel-parameters.txt.
Thanks.
Quoted 27 lines
Cc "Rafael J. Wysocki" <[email protected]>Cc Len Brown <[email protected]>Cc Andy Shevchenko <[email protected]>Signed-off-by Chen Yu <[email protected]>--- kernel/power/main.c | 7 +++++++ 1 file changed, 7 insertions(+)kernel/power/main.c +7
-0@@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj,power_attr (pm_debug_messages); +static int __init pm_debug_message_setup (char *str) +{ + pm_debug_messages_on = true; +return 1 ; +} +__setup ("pm_debug_message" , pm_debug_message_setup); +/** * __pm_pr_dbg - Print a suspend debug message to the kernel log. * @defer: Whether or not to use printk_deferred() to print the message.
Signature · 2 lines
~Randy Reported-by: Randy Dunlap <[email protected]>
Hi Randy,
Quoted 8 lines · Randy Dunlap
Quoted 7 lines · Chen Yu
Debug messages from the system suspend/hibernation infrastructure is disabled by default, and can only be enabled after the system has boot up via
/sys/power/pm_debug_messages. This makes the hibernation resume hard to track as it involves system boot up across hibernation. There's no chance forsoftware_resume()to track the resume process, eg.
Quoted 7 lines
Quoted 2 lines
Turning on the
pm_debug_messagesduring boot up by appending 'pm_debug_message'.Please add that command line option to
Documentation/admin-guide/kernel-parameters.txt.
Thanks.
Thanks for pointing it out, I'll add it in the v2 patch. Thanks,
Chenyu
Quoted 2 lines
~Randy
Reported-by Randy Dunlap <[email protected]>