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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org, linux-trace-devel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	"Tzvetomir Stoyanov" <tz.stoyanov@gmail.com>,
	Tom Zanussi <zanussi@kernel.org>, Shuah Khan <shuah@kernel.org>,
	Shuah Khan <skhan@linuxfoundation.org>,
	linux-kselftest@vger.kernel.org
Subject: [PATCH v8 4/5] selftests/ftrace: Add selftest for testing eprobe events
Date: Thu, 19 Aug 2021 11:26:08 -0400	[thread overview]
Message-ID: <20210819152825.526931866@goodmis.org> (raw)
In-Reply-To: <20210819152604.704335282@goodmis.org>

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

Add a test to test event probes, by creating a synthetic event across
sys_enter_openat and sys_exit_openat that passes the filename pointer from
the enter of the system call to the exit, and then add an event probe to
the synthetic event to make sure that the file name is seen.

Link: https://lkml.kernel.org/r/20210819041842.884828019@goodmis.org

Cc: Shuah Khan <shuah@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 .../test.d/dynevent/add_remove_eprobe.tc      | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc

diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc
new file mode 100644
index 000000000000..7b242f29b916
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_eprobe.tc
@@ -0,0 +1,53 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Generic dynamic event - add/remove eprobe events
+# requires: dynamic_events "e[:[<group>/]<event>] <attached-group>.<attached-event> [<args>]":README
+
+echo 0 > events/enable
+
+clear_dynamic_events
+
+SYSTEM="syscalls"
+START="sys_enter_openat"
+END="sys_exit_openat"
+FIELD="filename"
+SYNTH="synth_open"
+EPROBE="eprobe_open"
+
+echo "$SYNTH u64 filename; s64 ret;" > synthetic_events
+echo "hist:keys=common_pid:__arg__1=$FIELD" > events/$SYSTEM/$START/trigger
+echo "hist:keys=common_pid:filename=\$__arg__1,ret=ret:onmatch($SYSTEM.$START).trace($SYNTH,\$filename,\$ret)" > events/$SYSTEM/$END/trigger
+
+echo "e:$EPROBE synthetic/$SYNTH file=+0(\$filename):ustring ret=\$ret:s64" >> dynamic_events
+
+grep -q "$SYNTH" dynamic_events
+grep -q "$EPROBE" dynamic_events
+test -d events/synthetic/$SYNTH
+test -d events/eprobes/$EPROBE
+
+echo 1 > events/eprobes/$EPROBE/enable
+ls
+echo 0 > events/eprobes/$EPROBE/enable
+
+content=`grep '^ *ls-' trace | grep 'file='`
+nocontent=`grep '^ *ls-' trace | grep 'file=' | grep -v -e '"/' -e '"."'` || true
+
+if [ -z "$content" ]; then
+	exit_fail
+fi
+
+if [ ! -z "$nocontent" ]; then
+	exit_fail
+fi
+
+echo "-:$EPROBE" >> dynamic_events
+echo '!'"hist:keys=common_pid:filename=\$__arg__1,ret=ret:onmatch($SYSTEM.$START).trace($SYNTH,\$filename,\$ret)" > events/$SYSTEM/$END/trigger
+echo '!'"hist:keys=common_pid:__arg__1=$FIELD" > events/$SYSTEM/$START/trigger
+echo '!'"$SYNTH u64 filename; s64 ret;" >> synthetic_events
+
+! grep -q "$SYNTH" dynamic_events
+! grep -q "$EPROBE" dynamic_events
+! test -d events/synthetic/$SYNTH
+! test -d events/eprobes/$EPROBE
+
+clear_trace
-- 
2.30.2

  parent reply	other threads:[~2021-08-19 15:28 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19 15:26 [PATCH v8 0/5] tracing: Creation of event probe Steven Rostedt
2021-08-19 15:26 ` [PATCH v8 1/5] tracing/probes: Reject events which have the same name of existing one Steven Rostedt
2021-08-19 15:26 ` [PATCH v8 2/5] tracing: Add a probe that attaches to trace events Steven Rostedt
2021-08-20  0:10   ` Masami Hiramatsu
2021-08-19 15:26 ` [PATCH v8 3/5] selftests/ftrace: Add clear_dynamic_events() to test cases Steven Rostedt
2021-08-20  0:13   ` Masami Hiramatsu
2021-08-19 15:26 ` Steven Rostedt [this message]
2021-08-20  0:46   ` [PATCH v8 4/5] selftests/ftrace: Add selftest for testing eprobe events Masami Hiramatsu
2021-08-20 14:08     ` Steven Rostedt
2021-08-19 15:26 ` [PATCH v8 5/5] selftests/ftrace: Add selftest for testing duplicate eprobes and kprobes Steven Rostedt
2021-08-20  0:53   ` Masami Hiramatsu
2021-08-20 14:13     ` Steven Rostedt

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