[PATCH 0/4] perf: Support thread maps larger than one record

[Leo Yan <leo.yan@arm.com>]

PERF_RECORD_THREAD_MAP has a 16-bit size field and can hold at most
2,729 entries. Larger maps overflow the size field, producing records
that readers reject.

This series splits large maps into records with a continuation flag and
updates perf script and perf stat report to assemble the complete map
before allocating per-thread counters. It also adds boundary tests and
documents the format.

Maps that fit in one record keep their existing encoding. Split maps
require updated readers.

Signed-off-by: Leo Yan <leo.yan@arm.com>
---
Leo Yan (4):
      perf synthetic-events: Split oversized thread maps into records
      perf: Assemble split thread maps in script and stat report
      perf test: Cover multi-record thread map synthesis
      perf docs: Describe multi-record thread maps

 tools/lib/perf/include/perf/event.h                |   8 ++
 tools/perf/Documentation/perf.data-file-format.txt |  24 +++++
 tools/perf/builtin-script.c                        |  21 +++-
 tools/perf/builtin-stat.c                          |  25 +++--
 tools/perf/tests/thread-map.c                      | 111 +++++++++++++++++++++
 tools/perf/util/synthetic-events.c                 |  46 +++++++--
 tools/perf/util/thread_map.c                       |  51 ++++++++--
 tools/perf/util/thread_map.h                       |   2 +
 8 files changed, 256 insertions(+), 32 deletions(-)
---
base-commit: e8b3879165c74999b15e918b14ece7564cb09c59
change-id: 20261019-perf_fix_large_threads-f81558a92988

Best regards,
-- 
Leo Yan <leo.yan@arm.com>