[PATCH v3] ftracetest: Do not use usleep directly

[Namhyung Kim <namhyung@kernel.org>]

The usleep is only provided on distros from Redhat so running ftracetest
on other distro resulted in failures due to the missing usleep.

The reason of using [u]sleep in the test was to generate (scheduler)
events.  It can be done various ways like this:

yield() {  ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1; }

For more information to the history of this patch, please refer to:

Link: http://lkml.kernel.org/r/1427329943-16896-1-git-send-email-namhyung@kernel.org

Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Reported-by: Luis Henriques <luis.henriques@canonical.com>
Suggested-by: Pádraig Brady <P@draigBrady.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/testing/selftests/ftrace/test.d/event/event-enable.tc | 13 ++++++++++---
 .../selftests/ftrace/test.d/event/subsystem-enable.tc       | 13 ++++++++++---
 .../selftests/ftrace/test.d/event/toplevel-enable.tc        | 13 +++++++++++++
 3 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/event/event-enable.tc b/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
index dbddb7836f73..87eb9d6dd4ca 100644
--- a/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
+++ b/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
@@ -12,6 +12,10 @@ fail() { #msg
     exit $FAIL
 }
 
+yield() {
+    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
+}
+
 if [ ! -f set_event -o ! -d events/sched ]; then
     echo "event tracing is not supported"
     exit_unsupported
@@ -21,7 +25,8 @@ reset_tracer
 do_reset
 
 echo 'sched:sched_switch' > set_event
-usleep 1
+
+yield
 
 count=`cat trace | grep sched_switch | wc -l`
 if [ $count -eq 0 ]; then
@@ -31,7 +36,8 @@ fi
 do_reset
 
 echo 1 > events/sched/sched_switch/enable
-usleep 1
+
+yield
 
 count=`cat trace | grep sched_switch | wc -l`
 if [ $count -eq 0 ]; then
@@ -41,7 +47,8 @@ fi
 do_reset
 
 echo 0 > events/sched/sched_switch/enable
-usleep 1
+
+yield
 
 count=`cat trace | grep sched_switch | wc -l`
 if [ $count -ne 0 ]; then
diff --git a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
index ef9b95dc10c5..ced27ef0638f 100644
--- a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
+++ b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
@@ -12,6 +12,10 @@ fail() { #msg
     exit $FAIL
 }
 
+yield() {
+    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
+}
+
 if [ ! -f set_event -o ! -d events/sched ]; then
     echo "event tracing is not supported"
     exit_unsupported
@@ -21,7 +25,8 @@ reset_tracer
 do_reset
 
 echo 'sched:*' > set_event
-usleep 1
+
+yield
 
 count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
 if [ $count -lt 3 ]; then
@@ -31,7 +36,8 @@ fi
 do_reset
 
 echo 1 > events/sched/enable
-usleep 1
+
+yield
 
 count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
 if [ $count -lt 3 ]; then
@@ -41,7 +47,8 @@ fi
 do_reset
 
 echo 0 > events/sched/enable
-usleep 1
+
+yield
 
 count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
 if [ $count -ne 0 ]; then
diff --git a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
index af8cf01fc3a7..0bb5df3c00d4 100644
--- a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
+++ b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
@@ -12,6 +12,10 @@ fail() { #msg
     exit $FAIL
 }
 
+yield() {
+    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
+}
+
 if [ ! -f available_events -o ! -f set_event -o ! -d events ]; then
     echo "event tracing is not supported"
     exit_unsupported
@@ -21,6 +25,9 @@ reset_tracer
 do_reset
 
 echo '*:*' > set_event
+
+yield
+
 count=`cat trace | grep -v ^# | wc -l`
 if [ $count -eq 0 ]; then
     fail "none of events are recorded"
@@ -29,6 +36,9 @@ fi
 do_reset
 
 echo 1 > events/enable
+
+yield
+
 count=`cat trace | grep -v ^# | wc -l`
 if [ $count -eq 0 ]; then
     fail "none of events are recorded"
@@ -37,6 +47,9 @@ fi
 do_reset
 
 echo 0 > events/enable
+
+yield
+
 count=`cat trace | grep -v ^# | wc -l`
 if [ $count -ne 0 ]; then
     fail "any of events should not be recorded"
-- 
2.3.4