Delay in Printk Messages.

[mhornung.linux at gmail.com]

Hello Arun Kumar,

On Sat, 28. Jun 23:03, Arun Kumar wrote:
> I am able to read my printk messages in the kernel buffer only after 
> unloading the module..
> Is there some reason or configuration behind this.
> 
> I used a simple kernel module with only init and exit functions, and 
> after loading the module i cannot see the message printed by the 
> "module_init" function in the output given by "dmesg -c" I can see them 
> only after i unload the module.
> 

Since you do not provide your code I have to guess that your print
statement looks like this:

	  pr_debug("Hello World!");

Please notice that printk doesn't flush until a trailing newline is
provided (Linux Device Drivers Chapter 4). So maybe this is what you want:

	  pr_debug("Hello World!\n");

> i wait for around 15-20 seconds for the init message but it only shows 
> up on removing the module.
> 
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

With best regards

Michael Hornung