linux-kernel - Re: [PATCH v5 2/3] perf vendor events amd: add Zen2 events

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Date:   Wed, 18 Mar 2020 11:21:12 -0400
From:   Vijay Thakkar <vijaythakkar@...com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Kim Phillips <kim.phillips@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Martin Liška <mliska@...e.cz>,
        Jon Grimm <jon.grimm@....com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v5 2/3] perf vendor events amd: add Zen2 events

>   floating point:
>     fpu_pipe_assignment.total                         
>          [Total number of fp uOps]
>   
>   
>   Metric Groups:
>  

I just realized that I did not add back the counters for per pipe total
assignment as I said in the commit message. Patch 3/3 adds the total
uOp assignments per pipe for Zen1 based processors. Although the PPR for
Matisse does not list these counters, I can still sample them on my
Ryzen 3900X system and they seem to report correct numbers. For example,
here is the result of running:

$> perf stat -e r100,r200,r400,r800,rf00 ls

$> Performance counter stats for 'ls':

            5,047      r100:u
            5,236      r200:u
            31,300     r400:u
            2,040      r800:u
            43,623     fpu_pipe_assignment.total:u

Note that the per pipe total counters add up the overall total, which
makes me think I should submit a v6 of this patch adding the per pipe
totals for zen2 as well, especially since it is mentioned in the commit
message.

-Vijay