linux-kernel - [PATCH v1 0/4] perf e

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Message-ID: <20260123222209.1181249-1-irogers@google.com>
Date: Fri, 23 Jan 2026 14:22:05 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@...aro.org>, Guo Ren <guoren@...nel.org>, 
	Tianyou Li <tianyou.li@...el.com>, Athira Rajeev <atrajeev@...ux.ibm.com>, 
	Stephen Brennan <stephen.s.brennan@...cle.com>, Aditya Bodkhe <aditya.b1@...ux.ibm.com>, 
	Chun-Tse Shao <ctshao@...gle.com>, Swapnil Sapkal <swapnil.sapkal@....com>, 
	Howard Chu <howardchu95@...il.com>, Sergei Trofimovich <slyich@...il.com>, 
	Shimin Guo <shimin.guo@...dio.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-csky@...r.kernel.org
Subject: [PATCH v1 0/4] perf e_flags support for CSKY

The ELF machine type for CSKY is insufficent to describe the perf
registers, the e_flags from the ELF header is also required. Expand
the thread__e_machine and associated APIs to optionally fill in an
e_flags output field. For uses in `perf trace` the e_flags doesn't
matter and the e_flags needn't be computed. For `perf annotate` the
e_flags are computed and passed around, however, this is optimized so
the e_flags are only read for EM_CSKY. Call chain unwinding needs to
know about perf registers during recording and in the unwinding logic,
this is similarly wired up with the e_flags.

Ian Rogers (4):
  perf dso: Factor out e_machine reading for use in thread
  perf thread: Add optional e_flags output argument to thread__e_machine
  perf perf_regs: Accurately compute register names for CSKY
  perf unwind-libdw: Wire up e_flags for CSKY

 tools/perf/builtin-script.c                   |  38 +++--
 tools/perf/builtin-trace.c                    |  12 +-
 tools/perf/util/annotate.c                    |   5 +-
 tools/perf/util/disasm.c                      |   5 +-
 tools/perf/util/disasm.h                      |   2 +-
 tools/perf/util/dso.c                         | 139 ++++++++++++------
 tools/perf/util/dso.h                         |  12 +-
 tools/perf/util/parse-regs-options.c          |   4 +-
 .../perf/util/perf-regs-arch/perf_regs_csky.c |  13 +-
 tools/perf/util/perf_regs.c                   |   4 +-
 tools/perf/util/perf_regs.h                   |   4 +-
 .../scripting-engines/trace-event-python.c    |  17 ++-
 tools/perf/util/session.c                     |  26 ++--
 tools/perf/util/thread.c                      |  62 +++++---
 tools/perf/util/thread.h                      |  16 +-
 tools/perf/util/unwind-libdw.c                |   9 +-
 tools/perf/util/unwind-libdw.h                |   1 +
 17 files changed, 244 insertions(+), 125 deletions(-)

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2.52.0.457.g6b5491de43-goog