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Title: gh-101659: Isolate "obmalloc" State to Each Interpreter by ericsnowcurrently · Pull Request #101660 · python/cpython · GitHub

Open Graph Title: gh-101659: Isolate "obmalloc" State to Each Interpreter by ericsnowcurrently · Pull Request #101660 · python/cpython

X Title: gh-101659: Isolate "obmalloc" State to Each Interpreter by ericsnowcurrently · Pull Request #101660 · python/cpython

Description: This is strictly about moving the "obmalloc" runtime state from _PyRuntimeState to PyInterpreterState. Doing so improves isolation between interpreters, specifically most of the memory (incl. objects) allocated for each interpreter's use. This is important for a per-interpreter GIL, but such isolation is valuable even without it. FWIW, a per-interpreter obmalloc is the proverbial canary-in-the-coalmine when it comes to the isolation of objects between interpreters. Any object that leaks (unintentionally) to another interpreter is highly likely to cause a crash (on debug builds at least). That's a useful thing to know, relative to interpreter isolation. Benchmarking indicates the performance impact is negligible. (I'll re-run soon to double-check.) Issue: gh-101659

Open Graph Description: This is strictly about moving the "obmalloc" runtime state from _PyRuntimeState to PyInterpreterState. Doing so improves isolation between interpreters, specifically most of the memory (...

X Description: This is strictly about moving the "obmalloc" runtime state from _PyRuntimeState to PyInterpreterState. Doing so improves isolation between interpreters, specifically most of the ...

Opengraph URL: https://github.com/python/cpython/pull/101660

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07a09d4 Pass PyInterpreterState to pymalloc_*(). ericsnowcurrently Oct 6, 2022 https://github.com/python/cpython/pull/101660/commits/07a09d43cbb98d5939400274beedda0e449c63aa
ca75048 Move the object arenas to the interpreter state. ericsnowcurrently Oct 7, 2022 https://github.com/python/cpython/pull/101660/commits/ca75048cf44fa81004558a14e7d81e3aeb27e1f6
4ee199b Drop an errant #define. ericsnowcurrently Feb 7, 2023 https://github.com/python/cpython/pull/101660/commits/4ee199b166365a0222a12c3a12c47127032ce40e
2768fa4 Leave dump_debug_stats in the global state. ericsnowcurrently Feb 7, 2023 https://github.com/python/cpython/pull/101660/commits/2768fa44a765900493a20f4b5825b50571dc4d0d
bf9425f Dynamically initialize obmalloc for subinterpreters. ericsnowcurrently Feb 9, 2023 https://github.com/python/cpython/pull/101660/commits/bf9425fae8bab3e024de7241840c83686fb00ab1
d5da34b Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Mar 9, 2023 https://github.com/python/cpython/pull/101660/commits/d5da34b717f8ed3c59857575d1b799f700104a95
6c3111c Pass around struct _obmalloc_state* instead of PyInterpeterState*. ericsnowcurrently Mar 8, 2023 https://github.com/python/cpython/pull/101660/commits/6c3111c8029e853807db322d3654ce4ecedbcf35
4dc087d Add _PyInterpreterConfig.use_main_obmalloc. ericsnowcurrently Mar 9, 2023 https://github.com/python/cpython/pull/101660/commits/4dc087dea276b3f5c0b8b98b79614661c777971d
1ae33a0 Add a comment about why per-interpreter obmalloc requires multi-phase… ericsnowcurrently Mar 9, 2023 https://github.com/python/cpython/pull/101660/commits/1ae33a05b95b6458a7fbadbc7b31bc98a8b06a09
5b54d63 Add a TODO comment. ericsnowcurrently Mar 9, 2023 https://github.com/python/cpython/pull/101660/commits/5b54d632e862005f0768c05a62d2832a16985d40
9f4f8f3 Optionally use the main interpreter's obmalloc state. ericsnowcurrently Mar 9, 2023 https://github.com/python/cpython/pull/101660/commits/9f4f8f36a2d3c7ecec42af15c3b731d7f9d1ec13
aa10204 Pass use_main_obmalloc to run_in_subinterp() in test_import. ericsnowcurrently Mar 9, 2023 https://github.com/python/cpython/pull/101660/commits/aa102049e999ace80e530bd6653f27234f8d2344
69d9a2d _Py_GetAllocatedBlocks() -> _Py_GetGlobalAllocatedBlocks(). ericsnowcurrently Mar 10, 2023 https://github.com/python/cpython/pull/101660/commits/69d9a2df4248adbe61cb75bae4fdfe5f6b28f6fe
25378f8 Errors from _Py_NewInterpreterFromConfig() are no longer fatal. ericsnowcurrently Mar 10, 2023 https://github.com/python/cpython/pull/101660/commits/25378f87f0a9dc9a28f0d99e343baefa172cc900
1c5b109 Chain the exceptions. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/1c5b109b85b4df789ef2cfe31523a060b88887fc
f36426b Swap out the failed tstate. ericsnowcurrently Mar 10, 2023 https://github.com/python/cpython/pull/101660/commits/f36426bf8261f9189d3dd78ec905e8ca8a4e3d74
54b9f09 Remaining static builtin types must be fixed. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/54b9f09e5da4ef534fc20bd9bd90c444db4f24fe
2358a42 Add PyInterpreterState.sysdict_copy. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/2358a42e03579f2c499010c53b223ef918639f39
b6502e1 Set m_copy to None for sys and builtins. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/b6502e10a040ddfe87226e45a0607ea1e9072488
678e67b Add _PyIO_InitTypes(). ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/678e67bb5b6b79bcddccbd738fcff9b92398b068
69a5829 Fix test_capi. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/69a582923681359a601f87bd829ec4cc02748ec3
3feb408 Avoid allocation for shared exceptions. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/3feb408ac01a850ae3149964342fae1497a7f316
05806fc Fix the ChannelID tp_name. ericsnowcurrently Mar 13, 2023 https://github.com/python/cpython/pull/101660/commits/05806fcd3c1524628d826df289faf6af2ce7b749
b1cd7bb Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Mar 29, 2023 https://github.com/python/cpython/pull/101660/commits/b1cd7bb04b5e3c27f8e6e2fc8b79f681d6402646
4feb2b7 Do not include the total from interpreters sharing with main. ericsnowcurrently Mar 29, 2023 https://github.com/python/cpython/pull/101660/commits/4feb2b73682775b2565437b8503c0f0a761d6778
136ad2f Add _PyRuntime.obmalloc.interpreter_leaks. ericsnowcurrently Mar 29, 2023 https://github.com/python/cpython/pull/101660/commits/136ad2f80335647f1ba2951c86cdf6c58cb5d8a3
e19bb37 Track leaked blocks across init/fini cycles. ericsnowcurrently Mar 29, 2023 https://github.com/python/cpython/pull/101660/commits/e19bb37b98eaefa03caf5b5733a286dd0294db73
6c51997 Clean up assumptions around runtime fini. ericsnowcurrently Mar 29, 2023 https://github.com/python/cpython/pull/101660/commits/6c519972e15da96694c656d772d9a11e94cc3d03
f0fcaf6 Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Mar 29, 2023 https://github.com/python/cpython/pull/101660/commits/f0fcaf68f279f0857e3fdf5288c42284675b3d91
0ff65ff Add stubs for when WITH_PYMALLOC isn't defined. ericsnowcurrently Mar 30, 2023 https://github.com/python/cpython/pull/101660/commits/0ff65ff3cf9638be0178eb64ac93b2c2d6e840ce
7db8d4a Decref the key in the right interpreter in _extensions_cache_set(). ericsnowcurrently Mar 31, 2023 https://github.com/python/cpython/pull/101660/commits/7db8d4a92c87bb61cb932ba11398608e8b852914
38bee89 Don't test against sys (for now). ericsnowcurrently Mar 31, 2023 https://github.com/python/cpython/pull/101660/commits/38bee896ff4c0a3f70c02bc45a72854ff6ad2dc3
375a8f2 Clean up SubinterpImportTests. ericsnowcurrently Mar 31, 2023 https://github.com/python/cpython/pull/101660/commits/375a8f244051cfac2c0752d1dd78d648d57ff7db
b0a9e11 Ensure we are testing against the right type of extension. ericsnowcurrently Mar 31, 2023 https://github.com/python/cpython/pull/101660/commits/b0a9e11ee23fce841562b44322a20060cbfd1dc2
5e5d5d5 Add a test that uses an isolated interpreter. ericsnowcurrently Mar 31, 2023 https://github.com/python/cpython/pull/101660/commits/5e5d5d52136dca6fb04777aa299c0f8f0257a87d
25809ce Fix is_core_module(). ericsnowcurrently Apr 4, 2023 https://github.com/python/cpython/pull/101660/commits/25809ce4d4b538686320f82a4ebe73ff99104630
616d3dd Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Apr 4, 2023 https://github.com/python/cpython/pull/101660/commits/616d3ddf73609787fdb1560f1670b7ca431d33dd
43a836b Ignore last_final_leaks. ericsnowcurrently Apr 4, 2023 https://github.com/python/cpython/pull/101660/commits/43a836bfe137fa74fde46456b6f9ea34959429ba
1841b55 Fix a typo. ericsnowcurrently Apr 4, 2023 https://github.com/python/cpython/pull/101660/commits/1841b55f8900a16f111c37984e41d26c4096a4b4
299527e Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Apr 4, 2023 https://github.com/python/cpython/pull/101660/commits/299527eaa156c8d7c14fbf058776ddb727b43afb
0091e48 Add a note about global state owned by the module. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/0091e4839cba4d5b96710d93d69b8dd441bd009f
9f74f7b Factor out GLOBAL_MALLOC() and GLOBAL_FREE(). ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/9f74f7bde326f1cdb278a66c3aee48f4d8719211
10c3589 Switch to the raw allocator. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/10c35890e88a5390ea367d57bfcb1018090fe543
ff727ec Merge branch 'channels-raw-allocator' into per-interpreter-alloc ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/ff727ecdae22372e7408d2301f9b75e26fc70355
593430b Use the raw allocator for _PyCrossInterpreterData_InitWithSize(). ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/593430b7ccfdfd0b7799e9c6b6b5360405769a50
f5ae710 atexit_callback -> atexit_py_callback. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/f5ae7107974ccd6cb942093f9a878635e2f7d327
e6d4776 Add pycore_atexit.h. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/e6d4776ad1861b05bf3b16ac74151ee33a583c83
c719f02 Add _Py_AtExit(). ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/c719f0214891d0a0dceee30d27a00cf9f7719694
47c302d Add a TODO comment. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/47c302d459fff4d16ebf1f72fb1ae7c835d27fc9
aaeaaa6 Move _Py_AtExit() to the public API. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/aaeaaa6b1d8aeed439f598298291b4650aa4224a
b5396e4 Test a constraint. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/b5396e421d1bcc6f92bfc36d4aa61a9b33f18c61
448b48a Add an atexit callback for _xxinterpchannels. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/448b48a9c1f44cf0b261bf66bacce9cef2c5b9c0
c86f738 Implement the callback. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/c86f7380047394a72a19edd8249d2860041df0f3
1827feb Drop the _PyCrossInterpreterData_Clear() call in _xxinterpchannels. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/1827feb2e7d866b1ef71e1398b1e07425dd12aba
82b395c Drop the _PyCrossInterpreterData_Clear() call in _xxsubinterpreters. ericsnowcurrently Apr 5, 2023 https://github.com/python/cpython/pull/101660/commits/82b395cc4dc3ad498f1fcc35eebacd02024d5e47
df77a64 Merge branch 'atexit-c-callback' into per-interpreter-alloc ericsnowcurrently Apr 6, 2023 https://github.com/python/cpython/pull/101660/commits/df77a647279a609d83483f970336d782b4936cf7
22758a3 Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Apr 6, 2023 https://github.com/python/cpython/pull/101660/commits/22758a327d7fbe0d21c61cfc6f6541a33dabe909
0fd74a9 Merge branch 'main' into per-interpreter-alloc ericsnowcurrently Apr 24, 2023 https://github.com/python/cpython/pull/101660/commits/0fd74a9d11e8e479f6a52d15f52c26b1ac6f93a5
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