linux-kernel - Re: [PATCH v6 3/7] perf jevents: Support more event fields

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Date:   Mon, 7 Aug 2023 10:24:02 +0100
From:   John Garry <john.g.garry@...cle.com>
To:     Jing Zhang <renyu.zj@...ux.alibaba.com>,
        Ian Rogers <irogers@...gle.com>
Cc:     Will Deacon <will@...nel.org>, James Clark <james.clark@....com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-doc@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>
Subject: Re: [PATCH v6 3/7] perf jevents: Support more event fields

On 07/08/2023 08:51, Jing Zhang wrote:
> The usual event descriptions are "event=xxx" or "config=xxx", while the
> event descriptions of CMN are "type=xxx, eventid=xxx" or more complex.
> 
> $cat /sys/bus/event_source/devices/arm_cmn_0/events/hnf_cache_fill
> type=0x5,eventid=0x3
> 
> When adding aliases for events described as "event=xxx" or "config=xxx",
> EventCode or ConfigCode can be used in the JSON files to describe the
> events. But "eventid=xxx, type=xxx" cannot be supported at present.
> 
> If EventCode and ConfigCode is not added in the alias JSON file, the
> event description will add "event=0" by default. So, even if the event
> field is added to supplement "eventid=xxx" and "type=xxx", the final
> parsing result will be "event=0, eventid=xxx, type=xxx".
> 
> Therefore, when EventCode and ConfigCode are missing in JSON, "event=0" is
> no longer added by default. EventIdCode and Type are added to the event
> field, and ConfigCode is moved into the event_field array which can also
> guarantee its original function.
> 
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>

I'll let Ian check this change as he is more familiar with this code.

Thanks