gistfile1.txt

b9007b6c548f91e88fd3f2ffa23de740431fa969 is the first bad commit
commit b9007b6c548f91e88fd3f2ffa23de740431fa969
Author: Koichi Sasada <ko1@atdot.net>
Date:   Wed Jan 8 16:14:01 2020 +0900

    Introduce disposable call-cache.

    This patch contains several ideas:

    (1) Disposable inline method cache (IMC) for race-free inline method cache
        * Making call-cache (CC) as a RVALUE (GC target object) and allocate new
          CC on cache miss.
        * This technique allows race-free access from parallel processing
          elements like RCU.
    (2) Introduce per-Class method cache (pCMC)
        * Instead of fixed-size global method cache (GMC), pCMC allows flexible
          cache size.
        * Caching CCs reduces CC allocation and allow sharing CC's fast-path
          between same call-info (CI) call-sites.
    (3) Invalidate an inline method cache by invalidating corresponding method
        entries (MEs)
        * Instead of using class serials, we set "invalidated" flag for method
          entry itself to represent cache invalidation.
        * Compare with using class serials, the impact of method modification
          (add/overwrite/delete) is small.
        * Updating class serials invalidate all method caches of the class and
          sub-classes.
        * Proposed approach only invalidate the method cache of only one ME.

    See [Feature #16614] for more details.

 class.c                                   |  45 +-
 common.mk                                 |   1 +
 compile.c                                 |  38 +-
 debug_counter.h                           |  92 ++--
 eval.c                                    |   2 +-
 ext/objspace/objspace.c                   |   1 +
 gc.c                                      | 204 +++++++-
 id_table.c                                |   2 +-
 insns.def                                 |  13 +-
 internal/class.h                          |   2 +
 internal/imemo.h                          |   4 +
 internal/vm.h                             |  41 +-
 iseq.c                                    |  17 +
 method.h                                  |  11 +-
 mjit.c                                    |  19 +-
 mjit.h                                    |  29 ++
 mjit_compile.c                            |  42 +-
 mjit_worker.c                             |  30 +-
 test/-ext-/tracepoint/test_tracepoint.rb  |  12 +-
 test/ruby/test_gc.rb                      |   3 +
 test/ruby/test_inlinecache.rb             |  64 +++
 tool/mk_call_iseq_optimized.rb            |   2 +-
 tool/ruby_vm/views/_mjit_compile_send.erb |  23 +-
 tool/ruby_vm/views/mjit_compile.inc.erb   |   2 +-
 vm.c                                      |  26 +-
 vm_callinfo.h                             | 235 ++++++++-
 vm_core.h                                 |   3 +-
 vm_dump.c                                 |   4 +-
 vm_eval.c                                 |  50 +-
 vm_insnhelper.c                           | 814 ++++++++++++++++--------------
 vm_insnhelper.h                           |  15 +-
 vm_method.c                               | 630 ++++++++++++++---------
 32 files changed, 1606 insertions(+), 870 deletions(-)
 create mode 100644 test/ruby/test_inlinecache.rb
bisect run success