[PATCH v3 27/27] selftests/ftrace: Add fgraph-multi.tc test

Steven Rostedt
2024-06-03T19:07:14Z

From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

Add a test that creates 3 instances and enables function_graph tracer in
each as well as the top instance, where each will enable a filter (but one
that traces all functions) and check that they are filtering properly.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
.../ftrace/test.d/ftrace/fgraph-multi.tc | 103 ++++++++++++++++++
1 file changed, 103 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc
new file mode 100644
index 000000000000..ff88f97e41fb
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc
@@ -0,0 +1,103 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: ftrace - function graph filters
+# requires: set_ftrace_filter function_graph:tracer
+
+# Make sure that function graph filtering works
+
+INSTANCE1="instances/test1_$$"
+INSTANCE2="instances/test2_$$"
+INSTANCE3="instances/test3_$$"
+
+WD=`pwd`
+
+do_reset() {
+ cd $WD
+ if [ -d $INSTANCE1 ]; then
+ echo nop > $INSTANCE1/current_tracer
+ rmdir $INSTANCE1
+ fi
+ if [ -d $INSTANCE2 ]; then
+ echo nop > $INSTANCE2/current_tracer
+ rmdir $INSTANCE2
+ fi
+ if [ -d $INSTANCE3 ]; then
+ echo nop > $INSTANCE3/current_tracer
+ rmdir $INSTANCE3
+ fi
+}
+
+mkdir $INSTANCE1
+if ! grep -q function_graph $INSTANCE1/available_tracers; then
+ echo "function_graph not allowed with instances"
+ rmdir $INSTANCE1
+ exit_unsupported
+fi
+
+mkdir $INSTANCE2
+mkdir $INSTANCE3
+
+fail() { # msg
+ do_reset
+ echo $1
+ exit_fail
+}
+
+disable_tracing
+clear_trace
+
+do_test() {
+ REGEX=$1
+ TEST=$2
+
+ # filter something, schedule is always good
+ if ! echo "$REGEX" > set_ftrace_filter; then
+ fail "can not enable filter $REGEX"
+ fi
+
+ echo > trace
+ echo function_graph > current_tracer
+ enable_tracing
+ sleep 1
+ # search for functions (has "{" or ";" on the line)
+ echo 0 > tracing_on
+ count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep -v "$TEST" | wc -l`
+ echo 1 > tracing_on
+ if [ $count -ne 0 ]; then
+ fail "Graph filtering not working by itself against $TEST?"
+ fi
+
+ # Make sure we did find something
+ echo 0 > tracing_on
+ count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep "$TEST" | wc -l`
+ echo 1 > tracing_on
+ if [ $count -eq 0 ]; then
+ fail "No traces found with $TEST?"
+ fi
+}
+
+do_test '*sched*' 'sched'
+cd $INSTANCE1
+do_test '*lock*' 'lock'
+cd $WD
+cd $INSTANCE2
+do_test '*rcu*' 'rcu'
+cd $WD
+cd $INSTANCE3
+echo function_graph > current_tracer
+
+sleep 1
+count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep "$TEST" | wc -l`
+if [ $count -eq 0 ]; then
+ fail "No traces found with all tracing?"
+fi
+
+cd $WD
+echo nop > current_tracer
+echo nop > $INSTANCE1/current_tracer
+echo nop > $INSTANCE2/current_tracer
+echo nop > $INSTANCE3/current_tracer
+
+do_reset
+
+exit 0
--
2.43.0