linux-kernel - [PATCH v1 0/2] Build ID mmap related fixes

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Message-ID: <20250823000024.724394-1-irogers@google.com>
Date: Fri, 22 Aug 2025 17:00:22 -0700
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>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Collin Funk <collin.funk1@...il.com>, "Masami Hiramatsu (Google)" <mhiramat@...nel.org>, 
	Stephen Brennan <stephen.s.brennan@...cle.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Haibo Xu <haibo1.xu@...el.com>, Dmitry Vyukov <dvyukov@...gle.com>, Song Liu <song@...nel.org>, 
	Thomas Falcon <thomas.falcon@...el.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/2] Build ID mmap related fixes

Now that build ID mmap is the default I was seeing hangs during event
synthesis in the perftool-testsuite_report. The hang was happening due
to data pages giving block device file paths and opening the file to
read a build ID was blocking in the open. In investigating this issue
a bug in symbol-minimal was found. These 2 patches fix both issues. As
the issues are present in v6.17-rc2, I think it would be worthwhile to
add the patches as v6.17 fixes.

Ian Rogers (2):
  perf symbol-minimal: Fix ehdr reading in filename__read_build_id
  perf symbol: Add blocking argument to filename__read_build_id

 tools/perf/bench/inject-buildid.c  |  2 +-
 tools/perf/builtin-buildid-cache.c |  8 ++--
 tools/perf/builtin-inject.c        |  4 +-
 tools/perf/tests/sdt.c             |  2 +-
 tools/perf/util/build-id.c         |  4 +-
 tools/perf/util/debuginfo.c        |  8 +++-
 tools/perf/util/dsos.c             |  4 +-
 tools/perf/util/symbol-elf.c       |  9 +++--
 tools/perf/util/symbol-minimal.c   | 59 +++++++++++++++---------------
 tools/perf/util/symbol.c           |  8 ++--
 tools/perf/util/symbol.h           |  2 +-
 tools/perf/util/synthetic-events.c |  2 +-
 12 files changed, 58 insertions(+), 54 deletions(-)

-- 
2.51.0.rc2.233.g662b1ed5c5-goog