linux-kernel - Re: [PATCH 2/6] tools/perf/json: Add cache metrics for s390 z16

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Date:   Tue, 14 Mar 2023 09:20:38 +0100
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ian Rogers <irogers@...gle.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        sumanthk@...ux.ibm.com, svens@...ux.ibm.com, gor@...ux.ibm.com,
        hca@...ux.ibm.com
Subject: Re: [PATCH 2/6] tools/perf/json: Add cache metrics for s390 z16

On 3/13/23 19:33, Arnaldo Carvalho de Melo wrote:
> Em Mon, Mar 13, 2023 at 08:22:44AM -0700, Ian Rogers escreveu:
>> On Mon, Mar 13, 2023 at 1:30 AM Thomas Richter <tmricht@...ux.ibm.com> wrote:
>>>
>>> Add metrics for s390 z16
>>> - Percentage sourced from Level 2 cache
>>> - Percentage sourced from Level 3 on same chip cache
>>> - Percentage sourced from Level 4 Local cache on same book
>>> - Percentage sourced from Level 4 Remote cache on different book
>>> - Percentage sourced from memory
>>>
>>> For details about the formulas see this documentation:
>>> https://www.ibm.com/support/pages/system/files/inline-files/CPU%20MF%20Formulas%20including%20z16%20-%20May%202022_1.pdf
>>>
>>> Outpuf after:
>>>  # ./perf stat -M l4rp -- dd if=/dev/zero of=/dev/null bs=10M count=10K
>>>  .... dd output deleted
>>>
>>>  Performance counter stats for 'dd if=/dev/zero of=/dev/null bs=10M count=10K':
>>>
>>>                  0      IDCW_OFF_DRAWER_CHIP_HIT         #     0.00 l4rp
>>>            431,866      L1I_DIR_WRITES
>>>              2,395      IDCW_OFF_DRAWER_IV
>>>                  0      ICW_OFF_DRAWER
>>>                  0      IDCW_OFF_DRAWER_DRAWER_HIT
>>>              1,437      DCW_OFF_DRAWER
>>>        425,960,793      L1D_DIR_WRITES
>>>
>>>       12.165030699 seconds time elapsed
>>>
>>>        0.001037000 seconds user
>>>       12.162140000 seconds sys
>>>
>>>  #
>>>
>>> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
>>> Acked-By: Sumanth Korikkar <sumanthk@...ux.ibm.com>
>>
>> Acked-by: Ian Rogers <irogers@...gle.com>
> 
> Thanks, applied the first two patches, please address the review
> suggestions for patches 3-6 and resubmit only those.
> 
> The patches will be in the public perf-tools-next branch later today.
> 
> - Arnaldo
> 

I would really prefer the current implementation without using "ScaleUnit": "100%"
The reason is that these formulars are given to me from the s390 Performance team.
They want to use the exact same formulars on all platforms running on s390
which includes z/OS and z/VM. This way they are sure to get the same numbers.

Hope this background info helps.

Thanks a lot.
-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
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