** Changed in: linux (Ubuntu Jammy)
Status: Deferred => Won't Fix
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https://bugs.launchpad.net/bugs/2103415
Title:
[25.04 FEAT] [post announcement] [KRN2304] CPU-MF Counters for new IBM
Z hardware - perf part
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Won't Fix
Status in linux source package in Jammy:
Won't Fix
Status in linux source package in Noble:
Fix Committed
Status in linux source package in Plucky:
Fix Committed
Status in linux source package in Questing:
Won't Fix
Bug description:
[ Impact ]
perf list: Add IBM z17 event descriptions
Update IBM z17 counter description using document SA23-2260-08:
"The Load-Program-Parameter and the CPU-Measurement Facilities"
released in May 2025 to include counter definitions for IBM z17
counter sets:
* Basic counter set
* Problem/user counter set
* Crypto counter set.
Use document SA23-2261-09:
"The CPU-Measurement Facility Extended Counters Definition
for z10, z196/z114, zEC12/zBC12, z13/z13s, z14, z15, z16 and z17"
released on April 2025 to include counter definitions for IBM z17
* Extended counter set
* MT-Diagnostic counter set.
Use document SA22-7832-14:
"z/Architecture Principles of Operation."
released in April 2025 to include counter definitions for IBM z17
* PAI-Crypto counter set
* PAI-Extention counter set.
Use document
"CPU MF Formulas and Updates April 2025"
released in April 2025 to include metric calculations.
[ Fix ]
Backport the following upstream commit to Jammy, Noble and Plucky:
- 508b228942b2 perf list: Add IBM z17 event descriptions
Since Jammy is missing also IBM z16 descriptions, the following commits are
needed too:
- 7f76b3113068 perf list: Add IBM z16 event description for s390
- 74395567a301 perf vendor events s390: Add common metrics
- 850eea236f8a perf vendor events s390: Add cache metrics for z13
- add7894a25d1 perf vendor events s390: Add cache metrics for z14
- bdecfecac8ab perf vendor events s390: Add cache metrics for z15
- f8a6cea4839b perf vendor events s390: Add cache metrics for z16
- 4c290d4fa3ae perf vendor events s390: Add metric for TLB and cache
- eb2feb68cb7d perf vendor events s390: Remove UTF-8 characters from JSON file
- b6968f9b5035 perf list: fix short description for some cache events
- c2f3d7dfc737 perf stat: Do not fail on metrics on s390 z/VM systems
- b74bc5a633a7 perf report: Fix PAI counter names for s390 virtual machines
- 508b228942b2 perf list: Add IBM z17 event descriptions
[ Test Plan ]
Boot a z17 instance and verify that z17-specific events appear in perf list:
$ perf list
[ Regression Potential ]
The regression potential of this patch is very low,
since it only adds IBM z17-specific perf event descriptions
without touching core perf or kernel logic.
Any issues would be limited to inaccurate or
unsupported counters on z17 systems,
with no impact on other architectures.
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Feature Description:
Support for CPU-MF counters of new IBM Z hardware in kernel,
s390-tools, perf (kernel) and libpfm4.
This part covers the perf tools changes.
The related patches / commit IDs will be provided as soon as the
required information has been publicly disclosed.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/2103415/+subscriptions
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