examples: Print header once in interrupts-by-dev.stp

Trivial change. Avoid printing the header multiple times.
For instance:

	  DEVICE 	 NUMBER OF INTERRUPTS
        virtio0-input :      2
        virtio0-input :      1
        virtio0-input :      1
        virtio0-input :      2
     virtio3-requests :      4

Signed-off-by: Aaron Tomlin <atomlin@redhat.com>

diff --git a/testsuite/systemtap.examples/interrupt/interrupts-by-dev.stp b/testsuite/systemtap.examples/interrupt/interrupts-by-dev.stp
index 3bcfd5e122b919a034761051e166a09c4375721e..561295c27588cc0b3f0c9f86f5a081c646379ab2 100755 (executable)
--- a/testsuite/systemtap.examples/interrupt/interrupts-by-dev.stp
+++ b/testsuite/systemtap.examples/interrupt/interrupts-by-dev.stp
@@ -19,12 +19,15 @@
 
 global devices
 
+probe begin {
+        printf("\t  DEVICE \t NUMBER OF INTERRUPTS \n");
+}
+
 probe irq_handler.entry {
         devices[dev_name]++;
 }
 
 probe timer.ms(100) {
-        printf("\t  DEVICE \t NUMBER OF INTERRUPTS \n");
         foreach ( devname in devices )
                 printf(" %20s :  %5d\n",kernel_string(devname),devices[devname]);
         delete devices