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gh-112529: Make the GC scheduling thread-safe (#114880)

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The GC keeps track of the number of allocations (less deallocations)
since the last GC. This buffers the count in thread-local state and uses
atomic operations to modify the per-interpreter count. The thread-local
buffering avoids contention on shared state.

A consequence is that the GC scheduling is not as precise, so
"test_sneaky_frame_object" is skipped because it requires that the GC be
run exactly after allocating a frame object.
This commit is contained in:
Sam Gross 2024-02-16 11:22:27 -05:00 • committed by GitHub
parent f92857a930
commit b24c9161a6
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7 changed files with 71 additions and 16 deletions
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7
Include/internal/pycore_gc.h
View file

@ -260,6 +260,13 @@ struct _gc_runtime_state {
Py_ssize_t long_lived_pending;
};
#ifdef Py_GIL_DISABLED
struct _gc_thread_state {
/* Thread-local allocation count. */
Py_ssize_t alloc_count;
};
#endif
extern void _PyGC_InitState(struct _gc_runtime_state *);

1
Include/internal/pycore_tstate.h
View file

@ -28,6 +28,7 @@ typedef struct _PyThreadStateImpl {
PyThreadState base;
#ifdef Py_GIL_DISABLED
struct _gc_thread_state gc;
struct _mimalloc_thread_state mimalloc;
struct _Py_object_freelists freelists;
struct _brc_thread_state brc;