1 files changed, 25 insertions, 0 deletions
diff --git a/testsuite/systemtap.examples/io/iotop.stp b/testsuite/systemtap.examples/io/iotop.stp
new file mode 100644
index 00000000..6050343c
--- /dev/null
+++ b/testsuite/systemtap.examples/io/iotop.stp
@@ -0,0 +1,25 @@
+global reads, writes, total_io
+
+probe kernel.function("vfs_read") {
+    reads[execname()] += $count
+}
+
+probe kernel.function("vfs_write") {
+    writes[execname()] += $count
+}
+
+# print top 10 IO processes every 5 seconds
+probe timer.s(5) {
+    foreach (name in writes)
+        total_io[name] += writes[name]
+    foreach (name in reads)
+        total_io[name] += reads[name]
+    printf ("%16s\t%10s\t%10s\n", "Process", "KB Read", "KB Written")
+    foreach (name in total_io- limit 10)
+        printf("%16s\t%10d\t%10d\n", name,
+               reads[name]/1024, writes[name]/1024)
+    delete reads
+    delete writes
+    delete total_io
+    print("\n")
+}