Am 16.04.2014 11:58 schrieb Arun KS:
Hi Martin,
On Wed, Apr 16, 2014 at 2:46 PM, Martin Kepplinger <martink@posteo.de> wrote:
Am 2014-04-16 11:00, schrieb Arun KS:
Hi Martin,
On Wed, Apr 16, 2014 at 2:13 PM, Martin Kepplinger <martink@posteo.de> wrote:
I'm on Debian here and I don't really get pr_debug and printk(KERN_DEBUG ...). Let's stick to pr_debug.
I have DYNAMIC_DEBUG enabled and root@laptop:/proc/sys/kernel# cat /proc/sys/kernel/printk 7 7 1 7 This shows the console log level. This file controls the traffic to console. But all the log messages will be present in logbuf.
How do I view debug messages from logbuf?
I write a module with pr_debug's. I load the module and I *don't* see anything in /var/log/messages (or anywhere in /var/log/* ). Adding #define DEBUG doesn't help.
/sys/kernel/debug/dynamic_debug/control has the pr_debug entries I use in my loaded module.
In short: How do I see debug log messages? Using pr_info() works as expected. What am I missing? Do I need to edit my Makefile?
Did you enable dynamic printing for your file?
Below command enables dynamic printing for file sdhci.c. echo 'file sdhci.c +p' > /sys/kernel/debug/dynamic_debug/control
well. I tried that. The thing is, the pr_debug() symbols are in "control" only after "insmod my_module". Then I can echo -n 'file my_mobule.c +p' > control But my pr_debug() messages get printed directly after insmod, basically in my module_init function. Enabling my file doesn't output anything in /var/log/* So now you know why your pr_debug is absent in logbuf.
You can make your module as a built in and use bootargs.
eg: dyndbg="file your_filename.c +p"
Thanks, Arun
So it's *not* possible at all to get pr_debug() messages just like pr_info() messages? Of what I've read, I assumed pr_debug() is just loglevel 7. thanks for your help!
Thanks, Arun
thanks! martin
-- Martin Kepplinger e-mail martink AT posteo DOT at chat (XMPP) martink AT jabber DOT at
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