Message-ID: <20140923173846.603cb49c@gandalf.local.home>
Date:	Tue, 23 Sep 2014 17:38:46 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Shuah Khan <shuah.kh@...sung.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [RFC][PATCH] ftracetest: Add a couple of ftrace test cases


[
  Masami, I took two of my test scripts and added some basic comments
  to them and copied them pretty much unchanged into a ftrace directory
  under test.d. Is this fine, or is there more massaging I need to do
  to them?

  I know the echos don't show up, but I kept them anyway. What should
  happen with them?
]

Added two test cases to get the feel of adding tests to ftracetest.
The two cases are:

  function profiling test, to make sure function profiling still works
   with function tracing (was a regression)

  function graph filter test to make sure that the function graph filter
   does filter and also continues to filter when another function tracer
   is running (like the stack tracer)

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 .../ftrace/test.d/ftrace/fgraph-filter.tc          | 111 +++++++++++++++++++++
 .../ftrace/test.d/ftrace/func_profiler.tc          |  78 +++++++++++++++
 2 files changed, 189 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter.tc b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter.tc
new file mode 100644
index 000000000000..42f764d1f8d2
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter.tc
@@ -0,0 +1,111 @@
+#!/bin/sh
+# description: ftrace - function graph filters
+
+# Make sure that function graph filtering works, and is not
+# affected by other tracers enabled (like stack tracer)
+
+if ! grep -q function_graph available_tracers; then
+    echo "no function graph tracer configured"
+    exit 0;
+fi
+
+if [ ! -f set_ftrace_filter ]; then
+    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
+    exit 0
+fi
+
+do_reset() {
+    echo nop > current_tracer
+    echo 0 > /proc/sys/kernel/stack_tracer_enabled
+    echo 1 > tracing_on
+    echo > trace
+    echo > set_ftrace_filter
+}
+
+echo 0 > tracing_on
+# clear trace
+echo > trace
+# filter something, schedule is always good
+if ! echo "schedule" > set_ftrace_filter; then
+    # test for powerpc 64
+    if ! echo ".schedule" > set_ftrace_filter; then
+	echo "can not enable schedule filter"
+	exit -1
+    fi
+fi
+
+echo function_graph > current_tracer
+echo 1 > tracing_on
+sleep 1
+# search for functions (has "()" on the line), and make sure
+# that only the schedule function was found
+count=`cat trace | grep '()' | grep -v schedule | wc -l`
+if [ $count -ne 0 ]; then
+    echo "Graph filtering not working by itself?"
+    exit -1;
+fi
+
+# Make sure we did find something
+count=`cat trace | grep 'schedule()' | wc -l` 
+if [ $count -eq 0 ]; then
+    echo "No schedule traces found?"
+    exit -1
+fi
+
+echo "Graph filtering works by itself"
+
+if [ ! -f stack_trace ]; then
+    echo "Stack tracer not configured, can't continue test"
+    # stack tracer not configured in this kernel? pass test anyway
+    do_reset
+    exit 0;
+fi
+
+echo "Now testing with stack tracer"
+
+echo 1 > /proc/sys/kernel/stack_tracer_enabled
+
+echo 0 > tracing_on
+echo > trace
+echo 1 > tracing_on
+sleep 1
+
+count=`cat trace | grep '()' | grep -v schedule | wc -l`
+
+if [ $count -ne 0 ]; then
+    echo "Graph filtering not working with stack tracer?"
+    exit -1
+fi
+
+count=`cat trace | grep 'schedule()' | wc -l` 
+if [ $count -eq 0 ]; then
+    echo "No schedule traces found?"
+    exit -1
+fi
+
+echo "Graph filtering works with stack tracer"
+
+echo "Now testing if filtering still works without stack tracer"
+
+echo 0 > /proc/sys/kernel/stack_tracer_enabled
+echo > trace
+sleep 1
+
+
+count=`cat trace | grep '()' | grep -v schedule | wc -l`
+
+if [ $count -ne 0 ]; then
+    echo "Graph filtering not working after stack tracer disabled?"
+    exit -1
+fi
+
+count=`cat trace | grep 'schedule()' | wc -l` 
+if [ $count -eq 0 ]; then
+    echo "No schedule traces found?"
+    exit -1
+fi
+
+do_reset
+
+echo "SUCCESS!"
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
new file mode 100644
index 000000000000..f35c58968d09
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc
@@ -0,0 +1,78 @@
+#!/bin/sh
+# description: ftrace - function profiler with function tracing
+
+# There was a bug after a rewrite of the ftrace infrastructure that
+# caused the function_profiler not to be able to run with the function
+# tracer, because the function_profiler used the function_graph tracer
+# and it was assumed the two could not run simultaneously.
+#
+# There was another related bug where the solution to the first bug
+# broke the way filtering of the function tracer worked.
+#
+# This test triggers those bugs on those kernels.
+#
+# We need function_graph and profiling to to run this test
+if ! grep -q function_graph available_tracers; then
+    echo "no function graph tracer configured"
+    # allow it to pass, as the kernel doesn't support it
+    exit 0;
+fi
+
+if [ ! -f set_ftrace_filter ]; then
+    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
+    exit 0
+fi
+
+if [ ! -f function_profile_enabled ]; then
+    echo "function_profile_enabled not found, function profiling enabled?"
+    exit 0
+fi
+
+echo "Testing function tracer with profiler:"
+echo "enable function tracer"
+echo function > current_tracer || exit 1
+echo "enable profiler"
+echo 1 > function_profile_enabled || exit 1
+
+sleep 1
+
+echo "Now filter on just schedule"
+echo '*schedule' > set_ftrace_filter
+> trace
+
+echo "Now disable function profiler"
+echo 0 > function_profile_enabled || exit 1
+
+sleep 1
+
+# make sure only schedule functions exist
+
+echo "testing if only schedule is being traced"
+if grep -v -e '^#' -e 'schedule' trace; then
+	echo "more than schedule was found"
+	exit 1
+fi
+
+echo "Make sure schedule was traced"
+if ! grep -e 'schedule' trace > /dev/null; then
+	cat trace
+	echo "can not find schedule in trace"
+	exit 1
+fi
+
+echo "clear filter"
+echo > set_ftrace_filter || exit 1
+> trace
+
+sleep 1
+
+echo "make sure something other than scheduler is being traced"
+if ! grep -v -e '^#' -e 'schedule' trace > /dev/null; then
+	cat trace
+	echo "no other functions besides schedule was found"
+	exit 1
+fi
+
+echo nop > current_tracer || exit 1
+
+exit 0
-- 
1.8.1.4

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