1 files changed, 44 insertions, 0 deletions
diff --git a/testsuite/systemtap.examples/io/iostats.stp b/testsuite/systemtap.examples/io/iostats.stp
new file mode 100644
index 00000000..90bb4f5b
--- /dev/null
+++ b/testsuite/systemtap.examples/io/iostats.stp
@@ -0,0 +1,44 @@
+#! /usr/bin/env stap
+global opens, reads, writes, totals
+
+probe begin { printf("starting probe\n") }
+
+probe syscall.open {
+  e=execname();
+  opens[e] <<< 1 # statistics array
+}
+
+probe syscall.read.return {
+  count = $return
+  if ( count >= 0 ) {
+    e=execname();
+    reads[e] <<< count # statistics array
+    totals[e] += count
+  }
+}
+
+probe syscall.write.return {
+  count = $return
+  if (count >= 0 ) {
+    e=execname();
+    writes[e] <<< count # statistics array
+    totals[e] += count
+  }
+}
+
+probe end {
+  printf("\n%16s %8s %8s %8s %8s %8s %8s %8s\n",
+    "", "", "", "read", "read", "", "write", "write")
+  printf("%16s %8s %8s %8s %8s %8s %8s %8s\n",
+    "name", "open", "read", "KB tot", "B avg", "write", "KB tot", "B avg")
+  foreach (name in totals- limit 20) { # sort by total io
+    printf("%16s %8d %8d %8d %8d %8d %8d %8d\n",
+      name, @count(opens[name]),
+      @count(reads[name]),
+      (@count(reads[name]) ? @sum(reads[name])>>10 : 0 ),
+      (@count(reads[name]) ? @avg(reads[name]) : 0 ),
+      @count(writes[name]),
+      (@count(writes[name]) ? @sum(writes[name])>>10 : 0 ),
+      (@count(writes[name]) ? @avg(writes[name]) : 0 ))
+  }
+}