Please refer this ticket for details.
This change also introduces the following changes.
* Remove RGENGC_AGE2_PROMOTION and introduce object age (0 to 3).
Age can be count with FL_PROMOTE0 and FL_PROMOTE1 flags in
RBasic::flags (2 bit). Age == 3 objects become old objects.
* WB_PROTECTED flag in RBasic to WB_UNPROTECTED bitmap.
* LONG_LIVED bitmap to represent living objects while minor GCs
It specifies (1) Old objects and (2) remembered shady objects.
* Introduce rb_objspace_t::marked_objects which counts marked
objects in current marking phase. marking count is needed to
introduce incremental marking.
* rename mark related function and sweep related function to
gc_(marks|sweep)_(start|finish|step|rest|continue).
* rename rgengc_report() to gc_report().
* Add obj_info() function to get cstr of object details.
* Add MEASURE_LINE() macro to measure execution time of specific line.
* and many small fixes.
* include/ruby/ruby.h: add flag USE_RINCGC.
Now USE_RINCGC can be set only with USE_RGENGC.
* include/ruby/ruby.h: introduce FL_PROMOTED0 and add FL_PROMOTED1
to count object age.
* include/ruby/ruby.h: rewrite write barriers for incremental marking.
* debug.c: catch up flag name changes.
* internal.h: add rb_gc_writebarrier_remember() instead of
rb_gc_writebarrier_remember_promoted().
* array.c (ary_memcpy0): use rb_gc_writebarrier_remember().
* array.c (rb_ary_modify): ditto.
* hash.c (rb_hash_keys): ditto.
* hash.c (rb_hash_values): ditto.
* object.c (init_copy): use rb_copy_wb_protected_attribute() because
FL_WB_PROTECTED is moved from RBasic::flags.
* test/objspace/test_objspace.rb: catch up ObjectSpace.dump() changes.
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* ext/objspace/objspace_dump.c (dump_object): include fstring flag on
strings. include gc flags (old, remembered, wb_protected) on all objects.
* ext/objspace/objspace_dump.c (Init_objspace_dump): initialize lazy
IDs before first use.
* gc.c (rb_obj_gc_flags): new function to retrieve object flags
* internal.h (RB_OBJ_GC_FLAGS_MAX): maximum flags allowed for one obj
* test/objspace/test_objspace.rb (test_dump_flags): test for above
* test/objspace/test_objspace.rb (test_trace_object_allocations):
resolve name before dump (for rb_class_path_cached)
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* ext/objspace/gc_hook.c: remove this file
* ext/-test-/tracepoint/gc_hook.c: new filename for above
* ext/objspace/objspace.c: remove ObjectSpace.after_gc_start_hook=
* test/objspace/test_objspace.rb: remove test
* test/-ext-/tracepoint/test_tracepoint.rb: add above test for
tracepoint re-entry
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* string.c (str_new4): copy the original capacity so that memsize of
frozen shared string returns correct size.
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* ext/objspace/objspace_dump.c (dump_output): allow IO object as
output, and use Tempfile.create and return open file instead of
mkstemp() and path name for :file output.
[ruby-core:58266] [Bug #9102]
* test/objspace/test_objspace.rb (TestObjSpace#dump_my_heap_please):
remove temporary output file.
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shorter to be an embedded string on 32bit environment as well as
64bit environment.
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objectspace as json: ObjectSpace.dump_all and ObjectSpace.dump(obj).
These methods are useful for debugging reference leaks and memory growth
in large ruby applications. [Bug #9026] [ruby-core:57893] [Fixes GH-423]
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ObjectSpace.reachable_objects_from_root returns all objects refered
from root (called "root objects").
This feature is for deep object analysis.
* test/objspace/test_objspace.rb: add a test.
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* thread.c (rb_threadptr_execute_interrupts): flush postponed job only
once at last.
* vm_trace.c (rb_postponed_job_flush): defer calling postponed jobs
registered while flushing to get rid of infinite reentrance of
ObjectSpace.after_gc_start_hook. [ruby-dev:47400] [Bug #8492]
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* ObjectSpace::trace_object_allocations_start
* ObjectSpace::trace_object_allocations_stop
* ObjectSpace::trace_object_allocations_clear
And some refactoring.
* test/objspace/test_objspace.rb: add a test for new methods.
* NEWS: add a description for new methods.
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"[ruby-core:55182] [ruby-trunk - Bug #8456][Open] Sugfault in Ruby Head"
Care about the case TracePoint#path #=> `nil'.
* ext/objspace/object_tracing.c: add two new methods:
* ObjectSpace.allocation_class_path(o)
* ObjectSpace.allocation_method_id(o)
They are not useful for Object.new because they are always
"Class" and :new.
To trace more useful information, we need to maintain call-tree
using call/return hooks, which is implemented by
ll-prof <http://sunagae.net/wiki/doku.php?id=software:llprof>
* test/objspace/test_objspace.rb: add a test.
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Read the following test to know HOWTO.
This feature is a sample of RUBY_INTERNAL_EVENT.
* test/objspace/test_objspace.rb: add a test.
* ext/objspace/object_tracing.c: ditto.
* gc.c (rb_gc_count): add. THis function returns GC count.
* internal.h: add decl. of rb_gc_count(). Same as `GC.count'.
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These speed will slow down when there are many objects like test-all.
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for ObjectSpace.memsize_of().
* test/objspace/test_objspace.rb: add a test.
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* test/objspace/test_objspace.rb (test_reachable_objects_from): use
proper assertions, and show messages than comments.
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This method returns an array of objects referenced by given object.
If given object is special objects such as true/false/nil/Fixnum etc
then it returns nil. See rdoc for details.
[ruby-core:39772]
* test/objspace/test_objspace.rb: add a test for this method.
* gc.c: add rb_objspace_reachable_objects_from().
To make this function, add several member `mark_func_data'
to rb_objspace_t. If mark_func_data is not null, then
gc_mark() calls mark_func_data::mark_func.
* gc.h: export rb_objspace_reachable_objects_from().
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ObjectSpace.total_memsize_of_all_objects() to
ObjectSpace.memsize_of_all([klass]).
Accept Class object to filter the objects.
* test/objspace/test_objspace.rb: fix test for above change.
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* ext/objspace/objspace.c (total_memsize_of_all_objects): added.
* test/objspace/test_objspace.rb:
- add a test for ObjectSpace.total_memsize_of_all_objects.
- add two tests for ObjectSpace.memsize_of (for nil and Fixnum).
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