Hi Linus,
Please pull this kselftest fixes update for Linux 6.18-rc6
Fixes event-filter-function.tc tracing test failure caused when a first
run to sample events triggers kmem_cache_free which interferes with the
rest of the test. Fix this calling sample_events twice to eliminate the
kmem_cache_free related noise from the sampling.
diff is attached.
thanks,
-- Shuah
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The following changes since commit 920aa3a7705a061cb3004572d8b7932b54463dbf:
selftests: cachestat: Fix warning on declaration under label (2025-10-22
09:23:18 -0600)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
tags/linux_kselftest-fixes-6.18-rc6
for you to fetch changes up to dd4adb986a86727ed8f56c48b6d0695f1e211e65:
selftests/tracing: Run sample events to clear page cache events (2025-11-10
18:00:07 -0700)
----------------------------------------------------------------
linux_kselftest-fixes-6.18-rc6
Fixes event-filter-function.tc tracing test failure caused when a first
run to sample events triggers kmem_cache_free which interferes with the
rest of the test. Fix this calling sample_events twice to eliminate the
kmem_cache_free related noise from the sampling.
----------------------------------------------------------------
Steven Rostedt (1):
selftests/tracing: Run sample events to clear page cache events
tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc | 4 ++++
1 file changed, 4 insertions(+)
----------------------------------------------------------------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 c62165fabd0c..cfa16aa1f39a 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
@@ -20,6 +20,10 @@ sample_events() {
echo 0 > tracing_on
echo 0 > events/enable
+# Clear functions caused by page cache; run sample_events twice
+sample_events
+sample_events
+
echo "Get the most frequently calling function"
echo > trace
sample_events
