Public bug reported: ---Problem Description--- ubuntu 20.04: perf on z15: some counters reported with lscpumf are not usable with perf stat -e ---uname output--- Linux ubu204 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:57:22 UTC 2020 s390x s390x s390x GNU/Linux Machine Type = z15 8561 ---Steps to Reproduce--- lscpumf -c gives a list of available counters, but a few of them are not usable: DFLT_ACCESS,DFLT_CYCLES,DFLT_CC,DFLT_CCERROR perf list is also not offering these counters.
A solution will be a backport to 20.04, and tried to made available for next SRU , code needed before 06-12. Addl Info from Dev: I have downloaded the following repository https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal and checked out branch master-next. Both patches appended apply without warning and the compilation showed no error. For the perf tool: e7950166e40271c02 perf vendor events s390: Add new deflate counters for IBM z15 For the s390 kernel d68d5d51dc898895b s390/cpum_cf: Add new extended counters for IBM z15 All accepted for kernel 5.7 rc1 Please include both patches into Ubuntu 20.04 ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Skipper Bug Screeners (skipper-screen-team) Status: New ** Tags: architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 ** Tags added: architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1881096 Title: [UBUNTU 20.04] Deflate counters reported by lscpumf are not valid or available with perf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881096/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
