Profiling Kernel function blocks

[Domenico Di Leo]

Hi,
I was wondering if anybody has experienced a
hang of the entire OS when profiling
the functions of the kernel module.
In other words, when I run the following script
probe kernel.function("*@kernel/*.c").return{
     printf("%s  %s", threadindent(-1),probefunc());
}
the entire OS gets stuck.
I also tried with
probe kernel.function("*@kernel/*sched.c").return{
     printf("%s  %s", threadindent(-1),probefunc());
}
and after some printing the OS gets stuck again.

I'm using systemtap v1.4 and kernel 2.6.24 on Gentoo.
Thank

-- 
Domenico Di Leo, PhD student, Università degli Studi di Napoli Federico II
Ph:     +39 081 676770
Fax:    +39 081 676574
Web: http://wpage.unina.it/domenico.dileo (WP)