linux-kernel - Re: [PATCH v1 08/23] perf perf_regs: Switch from arch string to int e

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Message-ID: <aW_OV72q5rAVrgRE@x1>
Date: Tue, 20 Jan 2026 15:49:59 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	James Clark <james.clark@...aro.org>,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	Leo Yan <leo.yan@...ux.dev>, Guo Ren <guoren@...nel.org>,
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Shimin Guo <shimin.guo@...dio.com>,
	Athira Rajeev <atrajeev@...ux.ibm.com>,
	Stephen Brennan <stephen.s.brennan@...cle.com>,
	Howard Chu <howardchu95@...il.com>,
	Thomas Falcon <thomas.falcon@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Krzysztof Łopatowski <krzysztof.m.lopatowski@...il.com>,
	Chun-Tse Shao <ctshao@...gle.com>,
	Aditya Bodkhe <aditya.b1@...ux.ibm.com>,
	Haibo Xu <haibo1.xu@...el.com>,
	Sergei Trofimovich <slyich@...il.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
	linux-riscv@...ts.infradead.org, Mark Wielaard <mark@...mp.org>
Subject: Re: [PATCH v1 08/23] perf perf_regs: Switch from arch string to int
 e_machine

On Fri, Jan 16, 2026 at 09:28:34PM -0800, Ian Rogers wrote:
> The arch string requires multiple strcmp to identify things like the
> IP and SP. Switch to passing in an e_machine that in the bulk of cases
> is computed using a current thread load. The e_machine also allows
> identification of 32-bit vs 64-bit processes.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/builtin-script.c                   |  17 ++-
>  tools/perf/util/evsel.c                       |  14 ++-
>  tools/perf/util/perf_regs.c                   | 105 +++++++++++-------

[ Include dwarf-regs.h to get conditional defines for EM_CSKY and EM_LOONGARCH, not available in old distros ]

- Arnaldo