linux-kernel - Re: [PATCH] perf parse: Allow names to start with digits

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Date:   Mon, 4 Jul 2022 08:58:45 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Jiri Olsa <olsajiri@...il.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf parse: Allow names to start with digits

Jiri Olsa wrote on Sun, Jul 03, 2022 at 03:46:33PM +0200:
> > not sure if there'd be any other way of testing, there's nothing else in
> > 'perf list' that starts with a number.
> 
> maybe we could do it same way we did for fake pmu events like below

hmm, I'll have to defer to you on that honestly.

It looks good to me though and I've tested your diff (test succeeds even
with 9pnet module unloaded).

Just a note though, this makes test no longer checks the sys event
directories exist for all other tests in these arrays (test__events,
test__events_pmu and test__hybrid_events); if we have guarantees the
probes exist I believe at least a few should keep checking the format
path correctly.
It might be worth adding a check_format flag to test_event() and add a
new list that doesn't check formats just for 9p?

If you're ok with that I can resend this as three patches: my original
patch, a patch with your diff and test_event() keeping current
behaviour, and a last patch adding that last flag and testing 9p without
format check.

(and if you don't think it's worth checking probe existence same thing
but even simpler)
--
Dominique