Build ID mmap2 events have been available since Linux v5.12 and avoid
post-processing the perf.data file to inject build IDs for DSOs
referenced by samples. Enable these by default as discussed in:
https://lore.kernel.org/linux-perf-users/CAP-5=fXP7jN_QrGUcd55_QH5J-Y-FCaJ6=NaHVtyx0oyNh8_-Q@mail.gmail.com/

The dso_id is used to indentify a DSO that may change by being
overwritten. The inode generation isn't present in /proc/pid/maps and
so was already only optionally filled in. With build ID mmap events
the other major, minor and inode varialbes aren't filled in. Change
the dso_id implementation to make optional values explicit, rather
than injecting a dso_id we want to improve it during find operations,
add the buildid to the dso_id for sorting and so that matching fails
when build IDs vary between DSOs.

Other minor bits of build_id clean up.

Ian Rogers (5):
  perf build-id: Reduce size of "size" variable
  perf build-id: Truncate to avoid overflowing the build_id data
  perf build-id: Change sprintf functions to snprintf
  perf dso: Move build_id to dso_id
  perf record: Make --buildid-mmap the default

 tools/perf/builtin-buildid-cache.c            |  12 +-
 tools/perf/builtin-buildid-list.c             |   6 +-
 tools/perf/builtin-inject.c                   |  32 ++---
 tools/perf/builtin-record.c                   |  35 ++++--
 tools/perf/builtin-report.c                   |  11 +-
 tools/perf/include/perf/perf_dlfilter.h       |   2 +-
 tools/perf/tests/symbols.c                    |   4 +-
 tools/perf/util/build-id.c                    |  40 +++----
 tools/perf/util/build-id.h                    |   8 +-
 tools/perf/util/disasm.c                      |   2 +-
 tools/perf/util/dso.c                         | 111 ++++++++++--------
 tools/perf/util/dso.h                         |  75 ++++++------
 tools/perf/util/dsos.c                        |  20 ++--
 tools/perf/util/event.c                       |   2 +-
 tools/perf/util/header.c                      |   2 +-
 tools/perf/util/machine.c                     |  28 ++---
 tools/perf/util/map.c                         |  15 ++-
 tools/perf/util/map.h                         |   5 +-
 tools/perf/util/probe-file.c                  |   4 +-
 .../scripting-engines/trace-event-python.c    |   7 +-
 tools/perf/util/sort.c                        |  27 +++--
 tools/perf/util/symbol.c                      |   2 +-
 tools/perf/util/symbol_conf.h                 |   2 +-
 tools/perf/util/synthetic-events.c            |  42 ++++---
 24 files changed, 271 insertions(+), 223 deletions(-)

-- 
2.49.0.805.g082f7c87e0-goog