From cb5ef60067c11cc8887122f6f168c21941c5d624 Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Thu, 11 Jun 2015 02:32:40 -0400 Subject: [PATCH] perf stat: Error out unsupported group leader immediately perf stat ignores the unsupported event and continue to count supported event. But if the unsupported event is group leader, perf tool will crash. After applying this patch, the unsupported group leader will error out immediately. Without this patch: $ perf stat -x, -e '{node-prefetch-refs,cycles}' -- sleep 1 perf: util/evsel.c:1009: get_group_fd: Assertion `!(fd == -1)' failed. Aborted (core dumped) With this patch: $ perf stat -x, -e '{node-prefetch-refs,cycles}' -- sleep 1 Error: The node-prefetch-refs event is not supported. Commiter note: Here I got a different output, but no core dump: [acme@zoo linux]$ perf stat -x, -e '{node-prefetch-refs,cycles}' -- sleep 1 Error: The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (node-prefetch-refs). /bin/dmesg may provide additional information. No CONFIG_PERF_EVENTS=y kernel support configured? Signed-off-by: Kan Liang Tested-by: Arnaldo Carvalho de Melo Cc: Andi Kleen Link: http://lkml.kernel.org/r/1434004360-8570-1-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-stat.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index ff3d25803400..b24ecee95fec 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -549,7 +549,10 @@ static int __run_perf_stat(int argc, const char **argv) ui__warning("%s event is not supported by the kernel.\n", perf_evsel__name(counter)); counter->supported = false; - continue; + + if ((counter->leader != counter) || + !(counter->leader->nr_members > 1)) + continue; } perf_evsel__open_strerror(counter, &target, -- 2.20.1