[3.15] gh-152075: Avoid lock contention in _Py_Specialize_LoadGlobal under free threading (gh-153720) - #158905
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…nder free threading (pythongh-153720) Under high thread concurrency in free-threaded builds, `_Py_Specialize_LoadGlobal` suffers from lock contention when acquiring the critical section mutexes for the `globals` and `builtins` dictionaries during bytecode specialization. This PR skips LOAD_GLOBAL bytecode specialization if acquiring the two object mutexes would block. (cherry picked from commit ac8ba0c) Co-authored-by: Peter Hawkins <phawkins@google.com>
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Under high thread concurrency in free-threaded builds,
_Py_Specialize_LoadGlobalsuffers from lock contention when acquiring the critical section mutexes for theglobalsandbuiltinsdictionaries during bytecode specialization.This PR skips LOAD_GLOBAL bytecode specialization if acquiring the two object mutexes would block.
(cherry picked from commit ac8ba0c)
Co-authored-by: Peter Hawkins phawkins@google.com