perf tests: Add daemon reconfig test

Add a test for daemon reconfiguration. The test changes the
configuration file and checks that the session is changed properly.

Committer testing:

  [root@five ~]# perf test daemon
  76: daemon operations                                               : Ok
  [root@five ~]# time perf test daemon
  76: daemon operations                                               : Ok

  real	0m6.055s
  user	0m0.174s
  sys	0m0.147s
  [root@five ~]# time perf test -v daemon
  76: daemon operations                                               :
  --- start ---
  test child forked, pid 786863
  test daemon list
  test daemon reconfig
  test child finished with 0
  ---- end ----
  daemon operations: Ok

  real	0m6.127s
  user	0m0.222s
  sys	0m0.165s
  [root@five ~]#
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20210208200908.1019149-21-jolsa@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/daemon.sh

@@ -177,8 +177,127 @@ EOF
 	rm -f ${config}
 }
 
+test_reconfig()
+{
+	echo "test daemon reconfig"
+
+	local config=$(mktemp /tmp/perf.daemon.config.XXX)
+	local base=$(mktemp -d /tmp/perf.daemon.base.XXX)
+
+	# prepare config
+	cat <<EOF > ${config}
+[daemon]
+base=BASE
+
+[session-size]
+run = -e cpu-clock
+
+[session-time]
+run = -e task-clock
+EOF
+
+	sed -i -e "s|BASE|${base}|" ${config}
+
+	# start daemon
+	daemon_start ${config} size
+
+	# check 2nd session
+	# pid:time:-e task-clock:base/time:base/time/output:base/time/control:base/time/ack:0
+	local line=`perf daemon --config ${config} -x: | head -3 | tail -1`
+	check_line_other "${line}" time "-e task-clock" ${base}/session-time \
+			 ${base}/session-time/output ${base}/session-time/control ${base}/session-time/ack "0"
+	local pid=`echo "${line}" | awk 'BEGIN { FS = ":" } ; { print $1 }'`
+
+	# prepare new config
+	local config_new=${config}.new
+	cat <<EOF > ${config_new}
+[daemon]
+base=BASE
+
+[session-size]
+run = -e cpu-clock
+
+[session-time]
+run = -e cpu-clock
+EOF
+
+	# TEST 1 - change config
+
+	sed -i -e "s|BASE|${base}|" ${config_new}
+	cp ${config_new} ${config}
+
+	# wait for old session to finish
+	tail --pid=${pid} -f /dev/null
+
+	# wait for new one to start
+	local state="FAIL"
+	while [ "${state}" != "OK" ]; do
+		state=`perf daemon ping --config ${config} --session time | awk '{ print $1 }'`
+	done
+
+	# check reconfigured 2nd session
+	# pid:time:-e task-clock:base/time:base/time/output:base/time/control:base/time/ack:0
+	local line=`perf daemon --config ${config} -x: | head -3 | tail -1`
+	check_line_other "${line}" time "-e cpu-clock" ${base}/session-time \
+			 ${base}/session-time/output ${base}/session-time/control ${base}/session-time/ack "0"
+
+	# TEST 2 - empty config
+
+	local config_empty=${config}.empty
+	cat <<EOF > ${config_empty}
+[daemon]
+base=BASE
+EOF
+
+	# change config
+	sed -i -e "s|BASE|${base}|" ${config_empty}
+	cp ${config_empty} ${config}
+
+	# wait for sessions to finish
+	local state="OK"
+	while [ "${state}" != "FAIL" ]; do
+		state=`perf daemon ping --config ${config} --session time | awk '{ print $1 }'`
+	done
+
+	local state="OK"
+	while [ "${state}" != "FAIL" ]; do
+		state=`perf daemon ping --config ${config} --session size | awk '{ print $1 }'`
+	done
+
+	local one=`perf daemon --config ${config} -x: | wc -l`
+
+	if [ ${one} -ne "1" ]; then
+		echo "FAILED: wrong list output"
+		error=1
+	fi
+
+	# TEST 3 - config again
+
+	cp ${config_new} ${config}
+
+	# wait for size to start
+	local state="FAIL"
+	while [ "${state}" != "OK" ]; do
+		state=`perf daemon ping --config ${config} --session size | awk '{ print $1 }'`
+	done
+
+	# wait for time to start
+	local state="FAIL"
+	while [ "${state}" != "OK" ]; do
+		state=`perf daemon ping --config ${config} --session time | awk '{ print $1 }'`
+	done
+
+	# stop daemon
+	daemon_exit ${base} ${config}
+
+	rm -rf ${base}
+	rm -f ${config}
+	rm -f ${config_new}
+	rm -f ${config_empty}
+}
 error=0
 
 test_list
+test_reconfig
 
 exit ${error}