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Refactor VM root modules

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This `st_table` is used to both mark and pin classes
defined from the C API. But `vm->mark_object_ary` already
does both much more efficiently.

Currently a Ruby process starts with 252 rooted classes,
which uses `7224B` in an `st_table` or `2016B` in an `RArray`.

So a baseline of 5kB saved, but since `mark_object_ary` is
preallocated with `1024` slots but only use `405` of them,
it's a net `7kB` save.

`vm->mark_object_ary` is also being refactored.

Prior to this changes, `mark_object_ary` was a regular `RArray`, but
since this allows for references to be moved, it was marked a second
time from `rb_vm_mark()` to pin these objects.

This has the detrimental effect of marking these references on every
minors even though it's a mostly append only list.

But using a custom TypedData we can save from having to mark
all the references on minor GC runs.

Addtionally, immediate values are now ignored and not appended
to `vm->mark_object_ary` as it's just wasted space.
This commit is contained in:
Jean Boussier 2024-03-03 10:46:46 +01:00 • committed by Peter Zhu
parent 16ec54ec41
commit d4f3dcf4df
27 changed files with 167 additions and 101 deletions
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4
symbol.c
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@ -95,12 +95,12 @@ Init_sym(void)
VALUE dsym_fstrs = rb_ident_hash_new();
symbols->dsymbol_fstr_hash = dsym_fstrs;
rb_gc_register_mark_object(dsym_fstrs);
rb_vm_register_global_object(dsym_fstrs);
rb_obj_hide(dsym_fstrs);
symbols->str_sym = st_init_table_with_size(&symhash, 1000);
symbols->ids = rb_ary_hidden_new(0);
rb_gc_register_mark_object(symbols->ids);
rb_vm_register_global_object(symbols->ids);
Init_op_tbl();
Init_id();