linux-kernel - [PATCH v3 2/2] selftests/ftrace: Add new test case which checks for optimized probes

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Message-Id: <20230428163842.95118-3-akanksha@linux.ibm.com>
Date:   Fri, 28 Apr 2023 22:08:42 +0530
From:   Akanksha J N <akanksha@...ux.ibm.com>
To:     linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     rostedt@...dmis.org, mhiramat@...nel.org, shuah@...nel.org,
        naveen.n.rao@...ux.ibm.com, akanksha@...ux.ibm.com
Subject: [PATCH v3 2/2] selftests/ftrace: Add new test case which checks for optimized probes

Add new test case kprobe_opt_types.tc which enables and checks
if each probe has been optimized in order to test potential issues with
optimized probes.
The '|| continue' is added with the echo statement to ignore errors that
are caused by trying to add kprobes to non probeable lines and continue
with the test.

Signed-off-by: Akanksha J N <akanksha@...ux.ibm.com>
---
 .../ftrace/test.d/kprobe/kprobe_opt_types.tc  | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc
new file mode 100644
index 000000000000..9f5d99328086
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc
@@ -0,0 +1,34 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2023 Akanksha J N, IBM corporation
+# description: Register/unregister optimized probe
+# requires: kprobe_events
+
+case `uname -m` in
+x86_64)
+;;
+arm*)
+;;
+ppc*)
+;;
+*)
+  echo "Please implement other architecture here"
+  exit_unsupported
+esac
+
+DEFAULT=$(cat /proc/sys/debug/kprobes-optimization)
+echo 1 > /proc/sys/debug/kprobes-optimization
+for i in `seq 0 255`; do
+        echo  "p:testprobe $FUNCTION_FORK+${i}" > kprobe_events || continue
+        echo 1 > events/kprobes/enable || continue
+        (echo "forked")
+	PROBE=$(grep $FUNCTION_FORK /sys/kernel/debug/kprobes/list)
+        echo 0 > events/kprobes/enable
+        echo > kprobe_events
+	if echo $PROBE | grep -q OPTIMIZED; then
+                echo "$DEFAULT" >  /proc/sys/debug/kprobes-optimization
+                exit_pass
+        fi
+done
+echo "$DEFAULT" >  /proc/sys/debug/kprobes-optimization
+exit_unresolved
-- 
2.31.1