This is a note to let you know that I've just added the patch titled perf stat: Skip duration_time in setup_system_wide to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: perf-stat-skip-duration_time-in-setup_system_wide.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 01a42027133e240630819952113e74c3c329ff1e Author: Jin Yao <yao.jin@xxxxxxxxxxxxxxx> Date: Tue Sep 22 09:50:04 2020 +0800 perf stat: Skip duration_time in setup_system_wide [ Upstream commit 002a3d690f95804bdef6b70b26154103518e13d9 ] 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: e3ba76deef23064f ("perf tools: Force uncore events to system wide monitoring") Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx> Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Jin Yao <yao.jin@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Link: http://lore.kernel.org/lkml/20200922015004.30114-1-yao.jin@xxxxxxxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index ac2feddc75fdd..ea183922c4ef1 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -1671,8 +1671,10 @@ 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)