ACK: [SRU][F][PATCH 0/1] perf vendor events s390: Add new deflate counters for IBM z15

[Kleber Souza]

On 22.07.20 19:10, 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(-)
> 

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>