| 2020-05-28 09:49:25 |
bugproxy |
bug |
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added bug |
| 2020-05-28 09:49:27 |
bugproxy |
tags |
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architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 |
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| 2020-05-28 09:49:28 |
bugproxy |
attachment added |
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s390/cpum_cf: Add new extended counters for IBM z15 https://bugs.launchpad.net/bugs/1881096/+attachment/5377755/+files/0001-s390-cpum_cf-Add-new-extended-counters-for-IBM-z15.patch |
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| 2020-05-28 09:49:29 |
bugproxy |
attachment added |
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perf vendor events s390: Add new deflate counters for IBM z15 https://bugs.launchpad.net/bugs/1881096/+attachment/5377756/+files/0001-perf-vendor-events-s390-Add-new-deflate-counters-for.patch |
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| 2020-05-28 09:49:31 |
bugproxy |
ubuntu: assignee |
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Skipper Bug Screeners (skipper-screen-team) |
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| 2020-05-28 09:49:34 |
bugproxy |
affects |
ubuntu |
linux (Ubuntu) |
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| 2020-05-28 09:55:20 |
Heinz-Werner Seeck |
summary |
Deflate counters reported by lscpumf are not valid or available with perf |
[UBUNTU 20.04] Deflate counters reported by lscpumf are not valid or available with perf |
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| 2020-05-28 10:00:34 |
Frank Heimes |
bug task added |
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ubuntu-z-systems |
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| 2020-05-28 10:04:05 |
Frank Heimes |
ubuntu-z-systems: assignee |
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Skipper Bug Screeners (skipper-screen-team) |
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| 2020-05-28 10:04:21 |
Frank Heimes |
linux (Ubuntu): assignee |
Skipper Bug Screeners (skipper-screen-team) |
Canonical Kernel Team (canonical-kernel-team) |
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| 2020-05-28 10:04:27 |
Frank Heimes |
ubuntu-z-systems: importance |
Undecided |
Medium |
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| 2020-05-28 10:04:42 |
Frank Heimes |
bug |
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added subscriber Terry Rudd |
| 2020-05-28 10:04:58 |
Frank Heimes |
bug |
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added subscriber Canonical Kernel Team |
| 2020-06-04 21:17:01 |
Terry Rudd |
nominated for series |
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Ubuntu Focal |
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| 2020-06-04 21:17:01 |
Terry Rudd |
bug task added |
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linux (Ubuntu Focal) |
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| 2020-06-24 20:14:11 |
Frank Heimes |
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 |
SRU Justification:
==================
[Impact]
* With perf from Ubuntu 20.04 on IBM z15 hardware, some counters reported with lscpumf are not usable with 'perf stat -e'.
* 'lscpumf -c' provides a list of available counters, but the following are not usable: DFLT_ACCESS, DFLT_CYCLES, DFLT_CC, DFLT_CCERROR
* 'perf list' is also not offering these counters.
* On the kernel side this is fixed with the following upstream accepted commit:
[Fix]
* d68d5d51dc898895b4e15bea52e5668ca9e76180 d68d5d51dc898895b "s390/cpum_cf: Add new extended counters for IBM z15"
[Test Case]
* Requires the fix/patch of the perf tool, as mentioned in the bug, too.
* An IBM z15 (or LinuxONE III) system with Ubuntu 20.04 installed in LPAR is needed where the counters are enabled in the activation profile.
* Use 'perf list' to determine if the counters DFLT_ACCESS, DFLT_CYCLES, DFLT_CC, DFLT_CCERROR are listed
* Use 'perf stat -e' to enable amd make use of these counters.
[Regression Potential]
* The regression can be considered as low, since:
* it's architecture specific (s390x)
* limited to IBM z15 hardware
* and only additional (s390x) hardware counters are defined and added.
[Other]
* This requires a patch to be included into the perf itself, too - please see bug description for more details.
* Since this patch is upstream in kernel 5.7 it will automatically land in groovy.
__________
---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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| 2020-06-24 20:14:50 |
Frank Heimes |
linux (Ubuntu Focal): status |
New |
In Progress |
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| 2020-06-24 20:14:58 |
Frank Heimes |
linux (Ubuntu): status |
New |
In Progress |
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| 2020-06-24 20:15:06 |
Frank Heimes |
ubuntu-z-systems: status |
New |
In Progress |
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| 2020-08-03 20:21:49 |
Kelsey Steele |
linux (Ubuntu Focal): status |
In Progress |
Fix Committed |
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| 2020-08-04 05:56:16 |
Frank Heimes |
linux (Ubuntu): status |
In Progress |
Fix Committed |
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| 2020-08-04 05:56:20 |
Frank Heimes |
ubuntu-z-systems: status |
In Progress |
Fix Committed |
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| 2020-08-10 14:17:30 |
Ubuntu Kernel Bot |
tags |
architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 |
architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 verification-needed-focal |
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| 2020-08-11 14:34:21 |
Frank Heimes |
tags |
architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 verification-needed-focal |
architecture-s39064 bugnameltc-185899 severity-medium targetmilestone-inin2004 verification-done-focal |
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| 2020-08-27 13:59:42 |
Frank Heimes |
linux (Ubuntu Focal): status |
Fix Committed |
Fix Released |
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| 2020-09-03 10:59:39 |
Frank Heimes |
linux (Ubuntu): status |
Fix Committed |
Fix Released |
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| 2020-09-03 10:59:43 |
Frank Heimes |
ubuntu-z-systems: status |
Fix Committed |
Fix Released |
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