notes/system_tap at master · denis-plotnikov/notes · GitHub

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1. Install SystemTap
	a. Install -devel, -debuginfo and -debuginfo-common-arch packages for the kernel
	   for example the necessary packages for one of our kernels can be found here:
		http://kojistorage.eng.sw.ru/packages/vzkernel/3.10.0/327.28.2.vz7.17.9/x86_64/
	b. Install systemtap packages:
		yum install systemtap systemtap-runtime
        c. Test the systemtap:
		stap -v -e 'probe vfs.read {printf("read performed\n"); exit()}'
           In case of successful installation there is a "read performed" line in the command output
2. start systemtap
	stap <:system_tap_script_file>

	the system tap script file example:

probe kernel.trace("kvm_inj_virq")
{
                  //printf ("%s -> %s\n", thread_indent(1), probefunc())
                  //printf ("%s\n", probefunc())
                  printf ("********************************************\n")
                  print_backtrace()
}

//probe module("kvm").function("kvm_set_irq")
//{
//                printf ("%s -> %s\n", thread_indent(1), probefunc())
//}

//probe module("kvm").function("kvm_set_irq").callee("*")
//{
//                printf ("%s -> %s\n", thread_indent(1), probefunc())
//}

//probe module("kvm").function("kvm_set_irq").return
//{
//                printf ("%s <- %s\n", thread_indent(-1), probefunc())
//}