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Message-Id: <171932864022.584123.13092042198625511966.stgit@devnote2>
Date: Wed, 26 Jun 2024 00:17:20 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Shuah Khan <shuah@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Tom Zanussi <zanussi@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: [RFC PATCH 3/3] selftests/tracing: Add hist poll() support test
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Add a testcase for poll() on hist file. This introduces a helper binary
to the ftracetest, because there is no good way to reliably execute
poll() on hist file.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
tools/testing/selftests/ftrace/Makefile | 3 +
tools/testing/selftests/ftrace/poll.c | 34 +++++++++++++++
.../ftrace/test.d/trigger/trigger-hist-poll.tc | 46 ++++++++++++++++++++
3 files changed, 83 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/poll.c
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc
diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile
index a1e955d2de4c..830b2299ea27 100644
--- a/tools/testing/selftests/ftrace/Makefile
+++ b/tools/testing/selftests/ftrace/Makefile
@@ -6,4 +6,7 @@ TEST_PROGS := ftracetest-ktap
TEST_FILES := test.d settings
EXTRA_CLEAN := $(OUTPUT)/logs/*
+LDFLAGS += -static
+TEST_GEN_PROGS = poll
+
include ../lib.mk
diff --git a/tools/testing/selftests/ftrace/poll.c b/tools/testing/selftests/ftrace/poll.c
new file mode 100644
index 000000000000..800d1114629c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/poll.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Simple poll on a file.
+ *
+ * Copyright (c) 2024 Google LLC.
+ */
+
+#include <fcntl.h>
+#include <poll.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#define BUFSIZE 4096
+
+int main(int argc, char *argv[])
+{
+ struct pollfd pfd = {.events = POLLPRI};
+ char buf[BUFSIZE];
+
+ if (argc < 2)
+ return -1;
+ pfd.fd = open(argv[1], O_RDONLY);
+ if (pfd.fd < 0) {
+ perror("open");
+ return -1;
+ }
+
+ if (poll(&pfd, 1, -1) < 0) {
+ perror("poll");
+ return -1;
+ }
+ close(pfd.fd);
+ return 0;
+}
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc
new file mode 100644
index 000000000000..ac3999dee40b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc
@@ -0,0 +1,46 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: event trigger - test poll wait on histogram
+# requires: set_event events/sched/sched_process_free/trigger events/sched/sched_process_free/hist
+# flags: instance
+
+POLL=${FTRACETEST_ROOT}/poll
+
+if [ ! -x ${POLL} ]; then
+ echo "poll program is not compiled!"
+ exit_unresolved
+fi
+
+EVENT=events/sched/sched_process_free/
+
+echo "hist:key=comm" > ${EVENT}/trigger
+echo 1 > ${EVENT}/enable
+
+# setting timeout
+PID=$$
+SIG_FAIL=37
+trap exit_fail $SIG_FAIL
+sleep 10 && (kill -s ${SIG_FAIL} ${PID} ||:) &
+TOPID=$!
+
+# sleep command will exit after 2 seconds
+sleep 2 &
+BGPID=$!
+${POLL} ${EVENT}/hist
+# stop timeout
+kill -KILL ${TOPID} ||:
+
+cat trace > ${TMPDIR}/trace
+
+if [ -d /proc/${BGPID} ]; then
+ echo "poll exits too soon"
+ kill -KILL ${BGPID} ||:
+ exit_fail
+fi
+
+if ! grep -qw "sleep" ${TMPDIR}/trace; then
+ echo "poll exits before event happens"
+ exit_fail
+fi
+
+exit_pass
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