On Sat, Aug 03, 2013 at 10:08:42AM -0400, Valdis.Kletnieks@xxxxxx wrote: > On Sat, 03 Aug 2013 20:27:55 +0800, Woody Wu said: > > Hi, > > > > My kernel is printing too many messages at boot time from a special > > device driver (j2ffs filesystem). I belive these kernel messages are > > level DEBUG. If don't change the kernel code, is there anyway to print > > only some higher level of messages? > > In your kernel source tree, there's a file called Documentation/kernel-parameters.txt > and in it, we find documentation of the following two boot-time parameters: > > > ignore_loglevel [KNL] > Ignore loglevel setting - this will print /all/ > kernel messages to the console. Useful for debugging. > We also add it as printk module parameter, so users > could change it dynamically, usually by > /sys/module/printk/parameters/ignore_loglevel. > ... > > loglevel= All Kernel Messages with a loglevel smaller than the > console loglevel will be printed to the console. It can > also be changed with klogd or other programs. The > loglevels are defined as follows: > > 0 (KERN_EMERG) system is unusable > 1 (KERN_ALERT) action must be taken immediately > 2 (KERN_CRIT) critical conditions > 3 (KERN_ERR) error conditions > 4 (KERN_WARNING) warning conditions > 5 (KERN_NOTICE) normal but significant condition > 6 (KERN_INFO) informational > 7 (KERN_DEBUG) debug-level messages Valdis, thank you very much. I just passed loglevel=7 as kernel command line and hope it can suspress KERN_DEBUG messages printed out to console at boot time. But, it seems not work. A lot of debug level messages from jffs2 module still print out. I will go to check where is wrong. > > In addition, there may or may not be a module parameter to control the > logging level of the particular module - look for the word 'debug' in that > file. There's also the 'dynamic debugging' facility which the module may > be coded to support.... -- I can't go back to yesterday - because I was a different person then _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
