From: Masami Hiramatsu (Google) <mhira...@kernel.org>
Commit eb50d0f250e9 ("selftests/ftrace: Choose target function for filter
test from samples") choose the target function from samples, but sometimes
this test failes randomly because the target function does not hit at the
next time. So retry getting samples up to 10 times.
Fixes: eb50d0f250e9 ("selftests/ftrace: Choose target function for filter test
from samples")
Signed-off-by: Masami Hiramatsu (Google) <mhira...@kernel.org>
---
.../ftrace/test.d/filter/event-filter-function.tc | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git
a/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
b/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
index 3f74c09c56b6..118247b8dd84 100644
--- a/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
+++ b/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
@@ -10,7 +10,6 @@ fail() { #msg
}
sample_events() {
- echo > trace
echo 1 > events/kmem/kmem_cache_free/enable
echo 1 > tracing_on
ls > /dev/null
@@ -22,6 +21,7 @@ echo 0 > tracing_on
echo 0 > events/enable
echo "Get the most frequently calling function"
+echo > trace
sample_events
target_func=`cat trace | grep -o 'call_site=\([^+]*\)' | sed 's/call_site=//'
| sort | uniq -c | sort | tail -n 1 | sed 's/^[ 0-9]*//'`
@@ -32,7 +32,16 @@ echo > trace
echo "Test event filter function name"
echo "call_site.function == $target_func" > events/kmem/kmem_cache_free/filter
+
+sample_events
+max_retry=10
+while [ `grep kmem_cache_free trace| wc -l` -eq 0 ]; do
sample_events
+max_retry=$((max_retry - 1))
+if [ $max_retry -eq 0 ]; then
+ exit_fail
+fi
+done
hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
@@ -49,7 +58,16 @@ address=`grep " ${target_func}\$" /proc/kallsyms | cut -d' '
-f1`
echo "Test event filter function address"
echo "call_site.function == 0x$address" > events/kmem/kmem_cache_free/filter
+echo > trace
+sample_events
+max_retry=10
+while [ `grep kmem_cache_free trace| wc -l` -eq 0 ]; do
sample_events
+max_retry=$((max_retry - 1))
+if [ $max_retry -eq 0 ]; then
+ exit_fail
+fi
+done
hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
