diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 37c645f36a57..63e65e3ee85b 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4859,6 +4859,7 @@ Kernel parameters panic_print= Bitmask for printing system info when panic happens. User can chose combination of the following bits: + bit 0: print all tasks info bit 1: print system memory info bit 2: print timer info @@ -4867,10 +4868,16 @@ Kernel parameters bit 5: replay all kernel messages on consoles at the end of panic bit 6: print all CPUs backtrace (if available in the arch) bit 7: print only tasks in uninterruptible (blocked) state - *Be aware* that this option may print a _lot_ of lines, - so there are risks of losing older messages in the log. - Use this option carefully, maybe worth to setup a - bigger log buffer with "log_buf_len" along with this. + + *Be aware* that this option may print a _lot_ of lines. + + There is an increased risk of losing older messages in + the log. Maybe worth to setup a bigger log buffer with + "log_buf_len" along with this. + + Also consider using "printk.console_no_auto_verbose=Y" + if using this along with pstore, to avoid extra delays + due to increased console verbosity during panic. panic_sys_info= A comma separated list of extra information to be dumped on panic. @@ -4885,7 +4892,9 @@ Kernel parameters all_bt: print all CPUs backtrace (if available in the arch) blocked_tasks: print only tasks in uninterruptible (blocked) state - This is a human readable alternative to the 'panic_print' option. + This is a human readable alternative to the 'panic_print' + option above. Please be aware of the caveats using this, + check the 'panic_print' parameter for more details. panic_console_replay When panic happens, replay all kernel messages on