linux-kernel - Re: [PATCH v5 4/4] perf parse-events: Reapply "Prefer sysfs/JSON hardware events over legacy"

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Message-ID: <CAP-5=fW9f2mxuTV2FGCdhKm7M9g8v6VsLJJXTPTLRr5tUv9rOA@mail.gmail.com>
Date: Mon, 3 Feb 2025 16:41:11 -0800
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Atish Kumar Patra <atishp@...osinc.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	James Clark <james.clark@...aro.org>, Ze Gao <zegao2021@...il.com>, 
	Weilin Wang <weilin.wang@...el.com>, Dominique Martinet <asmadeus@...ewreck.org>, 
	Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, Junhao He <hejunhao3@...wei.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	bpf@...r.kernel.org, Aditya Bodkhe <Aditya.Bodkhe1@....com>, Leo Yan <leo.yan@....com>, 
	Beeman Strong <beeman@...osinc.com>, Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH v5 4/4] perf parse-events: Reapply "Prefer sysfs/JSON
 hardware events over legacy"

On Mon, Feb 3, 2025 at 4:15 PM Namhyung Kim <namhyung@...nel.org> wrote:
[snip]
> Yep, I agree it's confusing.  So my opinion is to use legacy encoding
> and no default wildcard. :)

Making it so that all non-legacy, non-core PMU events require a PMU is
a breaking change and a regression for all users, command line event
name suggesting, any tool built off of perf, and so on. Breaking all
perf users and requiring all perf metrics be rewritten is well..
something..

Ian