Merge branch 'master' into pr6866

Conflicts:
	ChangeLog: Removed
	runtime/ChangeLog: Removed
	runtime/sym.c: Merged
	runtime/task_finder.c: Merged
	tapset/ChangeLog: Removed
	testsuite/ChangeLog: Removed

2 files changed, 34 insertions, 0 deletions

diff --git a/testsuite/systemtap.examples/interrupt/scf.meta b/testsuite/systemtap.examples/interrupt/scf.meta
new file mode 100644
index 00000000..1d6ec3d8
--- /dev/null
+++ b/testsuite/systemtap.examples/interrupt/scf.meta
@@ -0,0 +1,13 @@
+title: Tally Backtraces for Inter-Processor Interrupt (IPI)
+name: scf.stp
+version: 1.0
+author: William Cohen
+keywords: interrupt backtrace
+subsystem: kernel
+status: production
+exit: user-controlled
+output: sorted-list
+scope: system-wide
+description: The Linux kernel function smp_call_function causes expensive inter-processor interrupts (IPIs). The scf.stp script tallies the processes and backtraces causing the interprocessor interrupts to identify the cause of the expensive IPI. On exit the script prints the tallies in descending frequency.
+test_check: stap -p4 scf.stp
+test_installcheck: stap scf.stp -c "sleep 1"
diff --git a/testsuite/systemtap.examples/interrupt/scf.stp b/testsuite/systemtap.examples/interrupt/scf.stp
new file mode 100644
index 00000000..f84c2494
--- /dev/null
+++ b/testsuite/systemtap.examples/interrupt/scf.stp
@@ -0,0 +1,21 @@
+#! /usr/bin/env stap
+# scf.stp
+# A reimplementation of user script:smp_call_function example given at OLS 2005
+# in the current language.
+
+global traces
+
+probe begin { print("Starting probe, type control-c to stop.\n") }
+
+probe kernel.function("smp_call_function")
+{
+  traces[pid(), pexecname(), backtrace()] ++
+}
+
+probe end {
+  foreach ([pid, name, stack] in traces-) { # sort by frequency encountered
+    printf ("traces[%d,%s,\n", pid, name)
+    print_stack (stack)
+    printf ("] = %d\n", traces[pid, name, stack]);
+  }
+}