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rtla/tests: Reset osnoise options before check 

Remove any dangling tracing instances from previous improperly exited
runs of rtla, and reset osnoise options to default before running a test
case.

This ensures that the test results are deterministic. Specific test
cases checked that rtla behaves correctly even when the tracer state is
not clean will be added later.

Cc: John Kacur <jkacur@redhat.com>
Cc: Luis Goncalves <lgoncalv@redhat.com>
Link: https://lore.kernel.org/20250320092500.101385-6-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
pull/1188/head
Tomas Glozar 2025-03-20 10:24:59 +01:00 committed by Steven Rostedt (Google)
parent 0122938a7a
commit 6c6182728a
1 changed files with 40 additions and 0 deletions
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40
tools/tracing/rtla/tests/engine.sh
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@ -8,12 +8,44 @@ test_begin() {
[ -n "$TEST_COUNT" ] && echo "1..$TEST_COUNT"
}
reset_osnoise() {
# Reset osnoise options to default and remove any dangling instances created
# by improperly exited rtla runs.
pushd /sys/kernel/tracing || return 1
# Remove dangling instances created by previous rtla run
echo 0 > tracing_thresh
cd instances
for i in osnoise_top osnoise_hist timerlat_top timerlat_hist
do
[ ! -d "$i" ] && continue
rmdir "$i"
done
# Reset options to default
# Note: those are copied from the default values of osnoise_data
# in kernel/trace/trace_osnoise.c
cd ../osnoise
echo all > cpus
echo DEFAULTS > options
echo 1000000 > period_us
echo 0 > print_stack
echo 1000000 > runtime_us
echo 0 > stop_tracing_total_us
echo 0 > stop_tracing_us
echo 1000 > timerlat_period_us
popd
}
check() {
# Simple check: run rtla with given arguments and test exit code.
# If TEST_COUNT is set, run the test. Otherwise, just count.
ctr=$(($ctr + 1))
if [ -n "$TEST_COUNT" ]
then
# Reset osnoise options before running test.
[ "$NO_RESET_OSNOISE" == 1 ] || reset_osnoise
# Run rtla; in case of failure, include its output as comment
# in the test results.
result=$(stdbuf -oL $TIMEOUT "$RTLA" $2 2>&1); exitcode=$?
@ -37,6 +69,14 @@ unset_timeout() {
unset TIMEOUT
}
set_no_reset_osnoise() {
NO_RESET_OSNOISE=1
}
unset_no_reset_osnoise() {
unset NO_RESET_OSNOISE
}
test_end() {
# If running without TEST_COUNT, tests are not actually run, just
# counted. In that case, re-run the test with the correct count.