APPLIED/CMT: [SRU][F][PATCH 0/1] perf vendor events s390: Add new deflate counters for IBM z15
Kelsey Skunberg
kelsey.skunberg at canonical.com
Thu Aug 6 22:52:50 UTC 2020
Applied to Focal/master-next. Verified the following patch is applied to
Focal/master-next already as requested:
7da7c2da2f65 ("s390/cpum_cf: Add new extended counters for IBM z15")
-Kelsey
On 2020-07-22 10:10:54 , Sultan Alsawaf wrote:
> BugLink: https://bugs.launchpad.net/bugs/1888551
>
> 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]
>
> * e7950166e40271c025e0eec348cdf5c63ac734fa "perf vendor events s390: Add new deflate counters for IBM z15"
>
> [Test Case]
>
> * Requires the fix/patch of the kernel (d68d5d51dc898895b4e15bea52e5668ca9e76180 "s390/cpum_cf: Add new extended counters for IBM z15")
>
> * 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]
>
> * Since these patches are upstream in kernel 5.7 they will automatically land in groovy.
>
> Thomas Richter (1):
> perf vendor events s390: Add new deflate counters for IBM z15
>
> .../pmu-events/arch/s390/cf_z15/crypto6.json | 8 ++---
> .../pmu-events/arch/s390/cf_z15/extended.json | 30 ++++++++++++++++++-
> 2 files changed, 33 insertions(+), 5 deletions(-)
>
> --
> 2.20.1
>
>
> --
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
More information about the kernel-team
mailing list