perf test: Add 30s timeout for wait for daemon start.

Retry the ping loop upto 600 times, or approximately 30 seconds, to make
sure the test does hang at start up.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210317005505.2794804-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/daemon.sh

@@ -127,9 +127,16 @@ daemon_start()
 
 	# wait for the session to ping
 	local state="FAIL"
+	local retries=0
 	while [ "${state}" != "OK" ]; do
 		state=`perf daemon ping --config ${config} --session ${session} | awk '{ print $1 }'`
 		sleep 0.05
+		retries=$((${retries} +1))
+		if [ ${retries} -ge 600 ]; then
+			echo "FAILED: Timeout waiting for daemon to ping"
+			daemon_exit ${config}
+			exit 1
+		fi
 	done
 }