This is the user space side of perf changes to handle deferred unwinding.
It is based on the kernel side of perf patch series here:

  https://lore.kernel.org/linux-trace-kernel/20250908171412.268168931@kernel.org/

Changes since v15: https://lore.kernel.org/linux-trace-kernel/20250825180638.877627656@kernel.org/

- Separate out the kernel changes from the user space changes of perf.

- Have the matching deferred code only skip when TID does not match.
  Otherwise, process the sample but do not merge if the cookies do not match.
  (Namhyung Kim)

Namhyung Kim (4):
      perf tools: Minimal CALLCHAIN_DEFERRED support
      perf record: Enable defer_callchain for user callchains
      perf script: Display PERF_RECORD_CALLCHAIN_DEFERRED
      perf tools: Merge deferred user callchains

----
 tools/lib/perf/include/perf/event.h       |  8 +++
 tools/perf/Documentation/perf-script.txt  |  5 ++
 tools/perf/builtin-script.c               | 92 +++++++++++++++++++++++++++++++
 tools/perf/util/callchain.c               | 24 ++++++++
 tools/perf/util/callchain.h               |  3 +
 tools/perf/util/event.c                   |  1 +
 tools/perf/util/evlist.c                  |  1 +
 tools/perf/util/evlist.h                  |  1 +
 tools/perf/util/evsel.c                   | 42 ++++++++++++++
 tools/perf/util/evsel.h                   |  1 +
 tools/perf/util/machine.c                 |  1 +
 tools/perf/util/perf_event_attr_fprintf.c |  1 +
 tools/perf/util/sample.h                  |  4 +-
 tools/perf/util/session.c                 | 81 +++++++++++++++++++++++++++
 tools/perf/util/tool.c                    |  2 +
 tools/perf/util/tool.h                    |  4 +-
 16 files changed, 269 insertions(+), 2 deletions(-)