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gh-112075: Avoid locking shared keys on every assignment (#116087)

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Dino Viehland 2024-02-29 13:38:50 -08:00 committed by GitHub
parent 41d5391c55
commit 556749c3e3
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1 changed files with 20 additions and 12 deletions
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32
Objects/dictobject.c
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@ -1597,19 +1597,11 @@ insertion_resize(PyInterpreterState *interp, PyDictObject *mp, int unicode)
}
static Py_ssize_t
insert_into_splitdictkeys(PyDictKeysObject *keys, PyObject *name)
insert_into_splitdictkeys(PyDictKeysObject *keys, PyObject *name, Py_hash_t hash)
{
assert(PyUnicode_CheckExact(name));
ASSERT_KEYS_LOCKED(keys);
Py_hash_t hash = unicode_get_hash(name);
if (hash == -1) {
hash = PyUnicode_Type.tp_hash(name);
if (hash == -1) {
PyErr_Clear();
return DKIX_EMPTY;
}
}
Py_ssize_t ix = unicodekeys_lookup_unicode(keys, name, hash);
if (ix == DKIX_EMPTY) {
if (keys->dk_usable <= 0) {
@ -6692,8 +6684,25 @@ _PyObject_StoreInstanceAttribute(PyObject *obj, PyDictValues *values,
assert(Py_TYPE(obj)->tp_flags & Py_TPFLAGS_MANAGED_DICT);
Py_ssize_t ix = DKIX_EMPTY;
if (PyUnicode_CheckExact(name)) {
LOCK_KEYS(keys);
ix = insert_into_splitdictkeys(keys, name);
Py_hash_t hash = unicode_get_hash(name);
if (hash == -1) {
hash = PyUnicode_Type.tp_hash(name);
assert(hash != -1);
}
#ifdef Py_GIL_DISABLED
// Try a thread-safe lookup to see if the index is already allocated
ix = unicodekeys_lookup_unicode_threadsafe(keys, name, hash);
if (ix == DKIX_EMPTY) {
// Lock keys and do insert
LOCK_KEYS(keys);
ix = insert_into_splitdictkeys(keys, name, hash);
UNLOCK_KEYS(keys);
}
#else
ix = insert_into_splitdictkeys(keys, name, hash);
#endif
#ifdef Py_STATS
if (ix == DKIX_EMPTY) {
if (PyUnicode_CheckExact(name)) {
@ -6709,7 +6718,6 @@ _PyObject_StoreInstanceAttribute(PyObject *obj, PyDictValues *values,
}
}
#endif
UNLOCK_KEYS(keys);
}
if (ix == DKIX_EMPTY) {
PyObject *dict = make_dict_from_instance_attributes(