Hi, Not sure if this has been reported before, but we noticed that LTP test perf_event_open02 [1] fails on 4.19.59-rt24 (and of course passes on the corresponding stable kernel): --- 4.19.59 --- # /mnt/tests/ltp-full-20190517/testcases/kernel/syscalls/perf_event_open/perf_event_open02 -v at iteration:0 value:300248705 time_enabled:59735349 time_running:59735349 at iteration:1 value:300257285 time_enabled:61370669 time_running:61370669 at iteration:2 value:300270267 time_enabled:65415976 time_running:65415976 at iteration:3 value:300275002 time_enabled:65775683 time_running:65775683 at iteration:4 value:300279509 time_enabled:67043153 time_running:67043153 at iteration:5 value:300271722 time_enabled:64872370 time_running:64872370 at iteration:6 value:300272600 time_enabled:65373637 time_running:65373637 at iteration:7 value:300269069 time_enabled:63948439 time_running:63948439 at iteration:8 value:300286123 time_enabled:67285143 time_running:67285143 at iteration:9 value:265004128 time_enabled:50212657 time_running:44998204 max hwctrs=9 perf_event_open02 0 TINFO : overall task clock: 44753322 perf_event_open02 0 TINFO : hw sum: 2702062269, task clock sum: 402442898 hw counters: 194164023 191715624 195214062 201992170 208770596 215560607 218849512 218851570 218851437 217860513 213522050 206742793 199967312 task clock counters: 28725966 28724910 29224060 30220734 31216660 32211515 32706172 32700336 32693327 32503365 31504015 30505413 29506425 perf_event_open02 0 TINFO : ratio: 8.992470 perf_event_open02 1 TPASS : test passed --- --- 4.19.59-rt24 --- # /mnt/tests/ltp-full-20190517/testcases/kernel/syscalls/perf_event_open/perf_event_open02 -v at iteration:0 value:308782766 time_enabled:69987925 time_running:69987925 at iteration:1 value:307230646 time_enabled:66629165 time_running:66629165 at iteration:2 value:307127853 time_enabled:64519500 time_running:64519500 at iteration:3 value:306408195 time_enabled:57616719 time_running:57616719 at iteration:4 value:306473441 time_enabled:57184704 time_running:57184704 at iteration:5 value:306324296 time_enabled:56319529 time_running:56319529 at iteration:6 value:307060120 time_enabled:62417456 time_running:62417456 at iteration:7 value:307666551 time_enabled:58920211 time_running:58920211 at iteration:8 value:306415586 time_enabled:56617543 time_running:56617543 at iteration:9 value:308025740 time_enabled:62503263 time_running:59956753 max hwctrs=9 perf_event_open02 0 TINFO : overall task clock: 49178216 perf_event_open02 0 TINFO : hw sum: 2773035141, task clock sum: 451529028 hw counters: 66671274 199200415 204422748 236485504 307467135 307472701 307478266 307483830 307489394 242524983 110001408 104784638 71552845 task clock counters: 11982838 33102129 33990719 38442306 49748594 49734632 49716493 49695178 49670953 39049846 17924067 17029183 11442090 perf_event_open02 0 TINFO : ratio: 9.181485 perf_event_open02 1 TFAIL : perf_event_open02.c:370: test failed (ratio was greater than ) --- --- Box info --- Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 36 On-line CPU(s) list: 0-35 Thread(s) per core: 1 Core(s) per socket: 18 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 63 Model name: Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz Stepping: 2 CPU MHz: 1237.805 BogoMIPS: 4594.31 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 46080K NUMA node0 CPU(s): 0-8,18-26 NUMA node1 CPU(s): 9-17,27-35 --- I just started looking into this issue, but thought to report early as to have more eyes on it. Best, Juri 1 - https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/perf_event_open/perf_event_open02.c#L21
