linux-kernel - Re: [PATCH v3 2/7] perf metric: Event "Compat" value supports matching multiple identifiers

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Date:   Tue, 13 Jun 2023 17:36:08 +0100
From:   John Garry <john.g.garry@...cle.com>
To:     Jing Zhang <renyu.zj@...ux.alibaba.com>,
        Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Robin Murphy <robin.murphy@....com>
Cc:     James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        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,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH v3 2/7] perf metric: Event "Compat" value supports
 matching multiple identifiers

On 12/06/2023 19:15, John Garry wrote:
> On 08/06/2023 10:44, Jing Zhang wrote:
>>> Unit is the format of the event_source device name. We should match 
>>> based on that as well as compat. I need to check the code again to 
>>> understand how that is done... it has changed a good bit in 3 years.
>>>
>> This situation only happens on uncore metric. I happened to write 
>> wrong Unit, but the metric still matches.
>>
> 
> I'm just double checking this now. I think any possible fix should be 
> easy enough for current code but may be tricky for backport with lots of 
> metric code changes.

I also have code to re-work sys event metric support such that we don't 
require "compat" or "Unit" values for a metric when the metric is 
described in terms of event aliases. That code is 2 years old, so may 
take a bit of time to rebase. I'll look to do that now.

Thanks,
John