perf env: Add perf_env__e_machine helper and use in perf_env__arch

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Add a helper that lazily computes the e_machine and falls back to EM_HOST.
Use the perf_env's arch to compute the e_machine if available, using a
binary search for efficiency while handling duplicate rules.

Switch perf_env__arch to be derived from e_machine for consistency.
To support 32-bit compat binaries on 64-bit hosts during dynamic local
or live operations, unpopulated arch fallback paths query uname() at
runtime to dynamically resolve the correct host e_machine, safely
preventing bitness misclassification regressions.

Update session and header to use the helper to safely record e_machine
and flags without forcing premature thread scanning.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Honglei Wang <jameshongleiwang@126.com>
Cc: Jan Polensky <japo@linux.ibm.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

...

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Ian Rogers 2026-06-02 08:24:58 -07:00 • committed by Arnaldo Carvalho de Melo

parent 078fc0430b

commit ed52302f51

4 changed files with 282 additions and 64 deletions

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290

tools/perf/util/env.c

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2

tools/perf/util/env.h

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32

tools/perf/util/header.c

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26

tools/perf/util/session.c

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