Shuah,
Can you take this through your urgent branch? -- Steve On Tue, 28 Oct 2025 12:27:24 -0400 Steven Rostedt <[email protected]> wrote: > From: Steven Rostedt <[email protected]> > > The tracing selftest "event-filter-function.tc" was failing because it > first runs the "sample_events" function that triggers the kmem_cache_free > event and it looks at what function was used during a call to "ls". > > But the first time it calls this, it could trigger events that are used to > pull pages into the page cache. > > The rest of the test uses the function it finds during that call to see if > it will be called in subsequent "sample_events" calls. But if there's no > need to pull pages into the page cache, it will not trigger that function > and the test will fail. > > Call the "sample_events" twice to trigger all the page cache work before > it calls it to find a function to use in subsequent checks. > > Cc: [email protected] > Fixes: eb50d0f250e96 ("selftests/ftrace: Choose target function for filter > test from samples") > Signed-off-by: Steven Rostedt (Google) <[email protected]> > --- > .../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..003f612f57b0 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
