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selftests/tracing: Fix event filter test to retry up to 10 times

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Commit eb50d0f250 ("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: eb50d0f250 ("selftests/ftrace: Choose target function for filter test from samples")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu (Google) 2024-05-31 18:43:37 +09:00 committed by Shuah Khan
parent cb708ab9f5
commit 0f42bdf59b
1 changed files with 19 additions and 1 deletions
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20
tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
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@ -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`