linux-kernel - Re: [PATCH RFC 4/9] perf jevents: Add sys_events_find_events

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Date:   Wed, 19 Jul 2023 16:36:52 +0100
From:   John Garry <john.g.garry@...cle.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     namhyung@...nel.org, acme@...nel.org, jolsa@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        renyu.zj@...ux.alibaba.com, shangxiaojing@...wei.com,
        kjain@...ux.ibm.com, kan.liang@...ux.intel.com
Subject: Re: [PATCH RFC 4/9] perf jevents: Add sys_events_find_events_table()

On 19/07/2023 16:25, Ian Rogers wrote:
>> I was thinking about this a little further. So you suggest that the
>> metric expression contains PMU name per term, like
>> "cpu_atom@...tructions@ / cpu_atom@...les@" - how would/could this work
>> for PMUs with more complex naming, like the form hisi_siclXXX_cpa_YYY?
>> Would we use the "Unit" expression for the metric name, like
>> "@hisi_sicl,cpa@...nt_foo"?
> How does this work for events? The "@hisi_sicl,cpa@...nt_foo" looks
> strange, shouldn't it be "hisi_sicl,cpa@...nt_foo@" but then hisi_sicl
> looks like an event name.

Yeah, that was a typo from me - like you say, it would be 
hisi_sicl,cpa@...nt_foo@

So is that what you would be suggesting then, such that we specify the 
PMU in the metric terms? It does look a bit odd :)

> 
>>>> BTW, which git repo/branch do you guys use for dev? I thought that it
>>>> would be acme git, but Namhyung says "We moved to new repos from acme to
>>>> perf/perf-tools and perf/perf-tools-next" - where is repo "perf"?
>>> Current development is here now:
>>> https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/log/?h=perf-tools-next__;!!ACWV5N9M2RV99hQ!OQDHOClSjd6nVZhmgzrK3RwzXuQpP54QhqyIKpITa_MFD4PLdS7yPYSnvInFja9nrFx9Sd-UnlsJ6XUqAh4$
>> Can that be added to the MAINTAINERS file? I suppose it is ok under
>> "PERFORMANCE EVENTS SUBSYTEM", since the two would-be git repos listed
>> under that same entry would be pretty obvious in purpose.
> Arnaldo could you take a look at doing this?

Thanks,
John