linux-kernel - Re: [PATCH v2 8/9] perf jevents: Generate metrics and events as separate tables

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Message-ID: <f5d0e9f0-7076-07f5-483b-57eaee26ff3f@oracle.com>
Date:   Mon, 23 Jan 2023 15:18:19 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Kim Phillips <kim.phillips@....com>,
        Florian Fischer <florian.fischer@...q.space>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        Kang Minchul <tegongkang@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sandipan Das <sandipan.das@....com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        linuxppc-dev@...ts.ozlabs.org, Kajol Jain <kjain@...ux.ibm.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [PATCH v2 8/9] perf jevents: Generate metrics and events as
 separate tables

On 21/12/2022 22:34, Ian Rogers wrote:
> Turn a perf json event into an event, metric or both. This reduces the
> number of events needed to scan to find an event or metric. As events
> no longer need the relatively seldom used metric fields, 4 bytes is
> saved per event. This reduces the big C string's size by 335kb (14.8%)
> on x86.
> 
> Signed-off-by: Ian Rogers<irogers@...gle.com>

It would have been good to show an example of how the output changes. I 
could not apply the series (see cover), and knowing what to expect makes 
reviewing the code easier...

Thanks,
John