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GH-126491: GC: Mark objects reachable from roots before doing cycle collection (GH-127110)

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* Mark almost all reachable objects before doing collection phase

* Add stats for objects marked

* Visit new frames before each increment

* Update docs

* Clearer calculation of work to do.
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Mark Shannon 2024-12-02 10:12:17 +00:00 • committed by GitHub
parent 2a373da770
commit a8dd821d5b
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14 changed files with 365 additions and 113 deletions
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4
Include/internal/pycore_object.h
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@ -471,8 +471,8 @@ static inline void _PyObject_GC_TRACK(
PyGC_Head *last = (PyGC_Head*)(generation0->_gc_prev);
_PyGCHead_SET_NEXT(last, gc);
_PyGCHead_SET_PREV(gc, last);
/* Young objects will be moved into the visited space during GC, so set the bit here */
gc->_gc_next = ((uintptr_t)generation0) | (uintptr_t)interp->gc.visited_space;
uintptr_t not_visited = 1 ^ interp->gc.visited_space;
gc->_gc_next = ((uintptr_t)generation0) | not_visited;
generation0->_gc_prev = (uintptr_t)gc;
#endif
}