Some metrics (such as DRAM_BW_Use) consists of uncore events and duration_time. For uncore events, counter->core.system_wide is true. But for duration_time, counter->core.system_wide is false so target.system_wide is set to false.
Then 'enable_on_exec' is set in perf_event_attr of uncore event. Kernel will return error when trying to open the uncore event. This patch skips the duration_time in setup_system_wide then target.system_wide will be set to true for the evlist of uncore events + duration_time. Before (tested on skylake desktop): # perf stat -M DRAM_BW_Use -- sleep 1 Error: The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (arb/event=0x84,umask=0x1/). /bin/dmesg | grep -i perf may provide additional information. After: # perf stat -M DRAM_BW_Use -- sleep 1 Performance counter stats for 'system wide': 169 arb/event=0x84,umask=0x1/ # 0.00 DRAM_BW_Use 40,427 arb/event=0x81,umask=0x1/ 1,000,902,197 ns duration_time 1.000902197 seconds time elapsed Fixes: 648b5af3f3ae ("libperf: Move 'system_wide' from 'struct evsel' to 'struct perf_evsel'") Signed-off-by: Jin Yao <yao....@linux.intel.com> --- tools/perf/builtin-stat.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 7f8d756d9408..9bcc93bc0973 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -2047,8 +2047,10 @@ static void setup_system_wide(int forks) struct evsel *counter; evlist__for_each_entry(evsel_list, counter) { - if (!counter->core.system_wide) + if (!counter->core.system_wide && + strcmp(counter->name, "duration_time")) { return; + } } if (evsel_list->core.nr_entries) -- 2.17.1