kernel/tools/perf/tests/shell/diff.sh, branch linux-6.16.y

perf test: Fixes to variable expansion and stdout for diff test

2025-03-15T01:15:13Z

When make_data fails its error message needs to go to stderr rather than stdout and the stdout value is captured in a variable. Quote the $err value so that it is always a valid input for test. This error is commonly encountered if no sample data is gathered by the test. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250312001841.1515779-1-irogers@google.com Signed-off-by: Namhyung Kim

perf test shell diff: Skip test if test_loop symbol is missing in the perf binary

2023-12-06T16:01:36Z

The diff test depends on finding the symbol test_loop in perf and will fail if perf has been stripped and no debug object is available. In that case, skip the test instead. Suggested-by: Adrian Hunter Signed-off-by: Ian Rogers Tested-by: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20231205164924.835682-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: Add basic 'perf diff' test

2023-12-05T18:48:52Z

There are some old bug reports on perf diff crashing: https://rhaas.blogspot.com/2012/06/perf-good-bad-ugly.html Happening across them I was prompted to add two very basic tests that will give some 'perf diff' coverage. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Athira Jajeev Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20231120190408.281826-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo