------- Comment From tmri...@de.ibm.com 2019-05-14 08:35 EDT------- I have debugged this issue Klaus reported.
I have installed the following system: root@s8360046:~/linux/tools/perf# uname -a Linux s8360046 4.18.0-17-generic #18-Ubuntu SMP Wed Mar 13 14:29:38 UTC 2019 s390x s390x s390x GNU/Linux root@s8360046:~/linux/tools/perf# and ran into the issue Klaus reported by running command root@s8360046:~/ # perf top in one window and in another window running this command while perf top was running: root@s8360046:~/ # for i in $(seq 15); do find / >/dev/null 2>&1; echo $i; done The issue shows up pretty quickly. I then cloned the linux kernel tree and build the perf tool from the downloaded linux kernel in directory linux/tools/perf. I did the same test with the locally compiled perf tools and the issue did not show up. To me it looked like the latest version did not have this problem. Next bisected the linux kernel tree (which also includes the perf tool) and the bisecting process stopped at the mentioned commit. Thats how I arrived at the commit id stated im comment 4. Obviously it did not fix the issue otherwise the patch would work. Sorry for that. It looks like we are back to start again. PS: I'm not sure but I have the feeling the issue only shows up when the debuginfo packages for the kernel are not installed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1828166 Title: perf top problem on z with Ubuntu 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1828166/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
