kernel/tools/perf/tests/shell/test_intel_pt.sh, branch linux-6.2.y

perf test: Do not fail Intel-PT misc test w/o libpython

2022-10-25T20:40:48Z

The virtual LBR test uses a python script to check the max size of branch stack in the Intel-PT generated LBR. But it didn't check whether python scripting is available (as it's optional). Let's skip the test if the python support is not available. Fixes: f77811a0f62577d2 ("perf test: test_intel_pt.sh: Add 9 tests") Reviewed-by: Adrian Hunter Signed-off-by: Namhyung Kim Acked-by: Ian Rogers Cc: Ammy Yi Cc: Ingo Molnar Cc: Jiri Olsa Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20221021181055.60183-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Add 9 tests

2022-10-15T13:13:16Z

Add tests: Test with MTC and TSC disabled Test with branches disabled Test with/without CYC Test recording with sample mode Test with kernel trace Test virtual LBR Test power events Test with TNT packets disabled Test with event_trace These tests mostly check that perf record works with the corresponding Intel PT config terms, sometimes also checking that certain packets do or do not appear in the resulting trace as appropriate. The "Test virtual LBR" is slightly trickier, using a Python script to check that branch stacks are actually synthesized. Signed-off-by: Ammy Yi Tested-by: Arnaldo Carvalho de Melo Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20221014170905.64069-8-adrian.hunter@intel.com Signed-off-by: Adrian Hunter Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Add jitdump test

2022-10-15T13:13:16Z

Add a test for decoding self-modifying code using a jitdump file. The test creates a workload that uses self-modifying code and generates its own jitdump file. The result is processed with perf inject --jit and checked for decoding errors. Note the test will fail without patch "perf inject: Fix GEN_ELF_TEXT_OFFSET for jit" applied. Signed-off-by: Adrian Hunter Tested-by: Arnaldo Carvalho de Melo Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20221014170905.64069-6-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Tidy some alignment

2022-10-15T13:13:16Z

Tidy alignment of test function lines to make them more readable. Signed-off-by: Adrian Hunter Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20221014170905.64069-5-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Print a message when skipping kernel tracing

2022-10-15T13:13:16Z

Messages display with the perf test -v option. Add a message to show when skipping a test because the user cannot do kernel tracing. Signed-off-by: Adrian Hunter Tested-by: Arnaldo Carvalho de Melo Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20221014170905.64069-4-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Tidy some perf record options

2022-10-15T13:13:16Z

When not decoding, the options "-B -N --no-bpf-event" speed up perf record. Make a common function for them. Signed-off-by: Adrian Hunter Tested-by: Arnaldo Carvalho de Melo Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20221014170905.64069-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Fix return checking again

2022-10-15T13:13:16Z

count_result() does not always reset ret=0 which means the value can spill into the next test result. Fix by explicitly setting it to zero between tests. Committer testing: # perf test "Miscellaneous Intel PT testing" 110: Miscellaneous Intel PT testing : Ok # Tested as well with: # perf test -v "Miscellaneous Intel PT testing" Fixes: fd9b45e39cfaf885 ("perf test: test_intel_pt.sh: Fix return checking") Tested-by: Arnaldo Carvalho de Melo Signed-off-by: Adrian Hunter Cc: Adrian Hunter Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20221014170905.64069-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Move helper functions for waiting

2022-10-04T11:55:23Z

Move helper functions for waiting to a separate file so they can be shared. Signed-off-by: Adrian Hunter Acked-by: Namhyung Kim Cc: Ian Rogers Cc: Jiri Olsa Link: https://lore.kernel.org/r/20220914080150.5888-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Add per-thread test

2022-10-04T11:55:23Z

When tracing the kernel with Intel PT, text_poke events are recorded per-cpu. In per-thread mode that results in a mixture of per-thread and per-cpu events and mmaps. Check that happens correctly. The debug output from perf record -vvv is recorded and then awk used to process the debug messages that indicate what file descriptors were opened and whether they were mmapped or set-output. Signed-off-by: Adrian Hunter Cc: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lore.kernel.org/lkml/20220912083412.7058-12-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: test_intel_pt.sh: Add more output in preparation for more tests

2022-10-04T11:55:23Z

When there are more tests it won't be obvious which test failed. Add more output so that it is. Signed-off-by: Adrian Hunter Acked-by: Namhyung Kim Cc: Ian Rogers Cc: Jiri Olsa Link: https://lore.kernel.org/r/20220912083412.7058-10-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo