From b77f8c36ce0b23da97f5442c2f55cc98c2cb5567 Mon Sep 17 00:00:00 2001 From: Levi Yun Date: Wed, 25 Sep 2024 14:20:22 +0100 Subject: [PATCH] perf stat: Stop repeating when ref_perf_stat() returns -1 Exit when run_perf_stat() returns an error to avoid continuously repeating the same error message. It's not expected that COUNTER_FATAL or internal errors are recoverable so there's no point in retrying. This fixes the following flood of error messages for permission issues, for example when perf_event_paranoid==3: perf stat -r 1044 -- false Error: Access to performance monitoring and observability operations is limited. ... Error: Access to performance monitoring and observability operations is limited. ... (repeating for 1044 times). Signed-off-by: Levi Yun Reviewed-by: James Clark Cc: nd@arm.com Cc: howardchu95@gmail.com Link: https://lore.kernel.org/r/20240925132022.2650180-3-yeoreum.yun@arm.com Signed-off-by: Namhyung Kim --- tools/perf/builtin-stat.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 2c46bdbd9914d..6cad3435b1984 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -968,6 +968,14 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) return err; } +/* + * Returns -1 for fatal errors which signifies to not continue + * when in repeat mode. + * + * Returns < -1 error codes when stat record is used. These + * result in the stat information being displayed, but writing + * to the file fails and is non fatal. + */ static int run_perf_stat(int argc, const char **argv, int run_idx) { int ret; @@ -2899,7 +2907,10 @@ int cmd_stat(int argc, const char **argv) evlist__reset_prev_raw_counts(evsel_list); status = run_perf_stat(argc, argv, run_idx); - if (forever && status != -1 && !interval) { + if (status == -1) + break; + + if (forever && !interval) { print_counters(NULL, argc, argv); perf_stat__reset_stats(); }