linux-kernel - Re: [PATCH v4 1/4] perf metric: Event "Compat" value supports matching multiple identifiers

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Date:   Tue, 25 Jul 2023 09:20:32 +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>, Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...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 v4 1/4] perf metric: Event "Compat" value supports
 matching multiple identifiers

On 23/07/2023 09:21, Jing Zhang wrote:
> The jevent "Compat" is used for uncore PMU alias or metric definitions.
> 
> The same PMU driver has different PMU identifiers due to different hardware
> versions and types, but they may have some common PMU event/metric. Since a
> Compat value can only match one identifier, when adding the same event
> alias and metric to PMUs with different identifiers, each identifier needs
> to be defined once, which is not streamlined enough.
> 
> So let "Compat" value supports matching multiple identifiers. For example,
> the Compat value {abcde;123*} can match the PMU identifier "abcde" and the
> the PMU identifier with the prefix "123", where "*" is a wildcard.
> Tokens in Unit field are delimited by ';' with no spaces.
> 
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
> ---
>   tools/perf/util/metricgroup.c | 27 ++++++++++++++++++++++++++-

Why only support for metrics? Why not support for regular events 
aliases? I would have expected pmu_add_sys_aliases_iter_fn() to have 
been updated for this.

On the basis that we will support regular events aliases, we need perf 
tool self-test cases for this in tools/perf/test/pmu-events.c (I think 
that pmu-events.c would be the most appropriate file)

Thanks,
John