From 8ab12a2038e36beda4062a8e7562a8cfe9655553 Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Thu, 8 Jun 2023 16:28:21 -0700 Subject: perf callchain: Use pthread keys for tls callchain_cursor Pthread keys are more portable than __thread and allow the association of a destructor with the key. Use the destructor to clean up TLS callchain cursors to aid understanding memory leaks. Committer notes: Had to fixup a series of unconverted places and also check for the return of get_tls_callchain_cursor() as it may fail and return NULL. In that unlikely case we now either print something to a file, if the caller was expecting to print a callchain, or return an error code to state that resolving the callchain isn't possible. In some cases this was made easier because thread__resolve_callchain() already can fail for other reasons, so this new one (cursor == NULL) can be added and the callers don't have to explicitely check for this new condition. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ali Saidi Cc: Andi Kleen Cc: Athira Rajeev Cc: Brian Robbins Cc: Changbin Du Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Fangrui Song Cc: German Gomez Cc: Ingo Molnar Cc: Ivan Babrou Cc: James Clark Cc: Jing Zhang Cc: Jiri Olsa Cc: John Garry Cc: K Prateek Nayak Cc: Kan Liang Cc: Leo Yan Cc: Liam Howlett Cc: Mark Rutland Cc: Miguel Ojeda Cc: Mike Leach Cc: Namhyung Kim Cc: Naveen N. Rao Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Sean Christopherson Cc: Steinar H. Gunderson Cc: Suzuki Poulouse Cc: Wenyu Liu Cc: Will Deacon Cc: Yang Jihong Cc: Ye Xingchen Cc: Yuan Can Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230608232823.4027869-25-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-script.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) (limited to 'tools/perf/builtin-script.c') diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index 784d478c2e05..e3f435e6a7d0 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -1557,11 +1557,13 @@ static int perf_sample__fprintf_bts(struct perf_sample *sample, unsigned int print_opts = output[type].print_ip_opts; struct callchain_cursor *cursor = NULL; - if (symbol_conf.use_callchain && sample->callchain && - thread__resolve_callchain(al->thread, &callchain_cursor, evsel, - sample, NULL, NULL, scripting_max_stack) == 0) - cursor = &callchain_cursor; - + if (symbol_conf.use_callchain && sample->callchain) { + cursor = get_tls_callchain_cursor(); + if (thread__resolve_callchain(al->thread, cursor, evsel, + sample, NULL, NULL, + scripting_max_stack)) + cursor = NULL; + } if (cursor == NULL) { printed += fprintf(fp, " "); if (print_opts & EVSEL__PRINT_SRCLINE) { @@ -2203,11 +2205,13 @@ static void process_event(struct perf_script *script, if (script->stitch_lbr) thread__set_lbr_stitch_enable(al->thread, true); - if (symbol_conf.use_callchain && sample->callchain && - thread__resolve_callchain(al->thread, &callchain_cursor, evsel, - sample, NULL, NULL, scripting_max_stack) == 0) - cursor = &callchain_cursor; - + if (symbol_conf.use_callchain && sample->callchain) { + cursor = get_tls_callchain_cursor(); + if (thread__resolve_callchain(al->thread, cursor, evsel, + sample, NULL, NULL, + scripting_max_stack)) + cursor = NULL; + } fputc(cursor ? '\n' : ' ', fp); sample__fprintf_sym(sample, al, 0, output[type].print_ip_opts, cursor, symbol_conf.bt_stop_list, fp); -- cgit v1.2.3