linux-kernel - Re: [RFC/PATCHSET 00/19] perf stat: Cleanup counter aggregation (v1)

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Date:   Mon, 10 Oct 2022 20:25:16 -0400
From:   Andi Kleen <ak@...ux.intel.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        James Clark <james.clark@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>
Subject: Re: [RFC/PATCHSET 00/19] perf stat: Cleanup counter aggregation (v1)


On 10/10/2022 10:35 PM, Namhyung Kim wrote:
> Hello,
>
> Current perf stat code is somewhat hard to follow since it handles
> many combinations of PMUs/events for given display and aggregation
> options.  This is my attempt to clean it up a little. ;-)


My main concern would be subtle regressions since there are so many 
different combinations and way to travel through the code, and a lot of 
things are not covered by unit tests. When I worked on the code it was 
difficult to keep it all working. I assume you have some way to 
enumerate them all and tested that the output is identical?

-Andi