** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1881096
Title:
[UBUNTU 20.04] Deflate counters reported by lscpumf are not valid or
available with perf
Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Focal:
New
Bug description:
---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
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