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Title: gh-115999: Implement thread-local bytecode and enable specialization for `BINARY_OP` by mpage · Pull Request #123926 · python/cpython · GitHub

Open Graph Title: gh-115999: Implement thread-local bytecode and enable specialization for `BINARY_OP` by mpage · Pull Request #123926 · python/cpython

X Title: gh-115999: Implement thread-local bytecode and enable specialization for `BINARY_OP` by mpage · Pull Request #123926 · python/cpython

Description: This PR implements the foundational work necessary for making the specializing interpreter thread-safe in free-threaded builds and enables specialization for BINARY_OP as an end-to-end example. To enable future incremental work, specialization can now be toggled on a per-family basis. Subsequent PRs will enable specialization in free-threaded builds for the remaining families. Each thread specializes a thread-local copy of the bytecode, created on the first RESUME, in free-threaded builds. All copies of the bytecode for a code object are stored in the co_tlbc array on the code object. Threads reserve a globally unique index identifying its copy of the bytecode in all co_tlbc arrays at thread creation and release the index at thread destruction. The first entry in every co_tlbc array always points to the "main" copy of the bytecode that is stored at the end of the code object. This ensures that no bytecode is copied for programs that do not use threads. Thread-local bytecode can be disabled at runtime by providing either -X tlbc=0 or PYTHON_TLBC=0. Disabling thread-local bytecode also disables specialization. Concurrent modifications to the bytecode made by the specializing interpreter and instrumentation use atomics, with specialization taking care not to overwrite an instruction that was instrumented concurrently. Issue: gh-115999

Open Graph Description: This PR implements the foundational work necessary for making the specializing interpreter thread-safe in free-threaded builds and enables specialization for BINARY_OP as an end-to-end example. To ...

X Description: This PR implements the foundational work necessary for making the specializing interpreter thread-safe in free-threaded builds and enables specialization for BINARY_OP as an end-to-end example. To ...

Opengraph URL: https://github.com/python/cpython/pull/123926

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gh-115999: Implement thread-local bytecode and enable specialization for BINARY_OP https://github.com/python/cpython/pull/123926/files#top
Show all changes 84 commits https://github.com/python/cpython/pull/123926/files
776a1e1 Assign threads indices into bytecode copies mpage Aug 15, 2024 https://github.com/python/cpython/pull/123926/commits/776a1e1ca877894b899b775ae562312adb65b6f2
2b40870 Replace most usage of PyCode_CODE mpage Aug 27, 2024 https://github.com/python/cpython/pull/123926/commits/2b40870422ee524cad3a8cf31424b629e5161a7b
344d7ad Get bytecode copying working mpage Aug 20, 2024 https://github.com/python/cpython/pull/123926/commits/344d7adb8a8f9eafad15c8864d39c1cb825beae3
f203d00 Refactor remove_tools mpage Aug 30, 2024 https://github.com/python/cpython/pull/123926/commits/f203d00158744ab0c19b4755b1feadb666d3d1d9
82b456a Refactor remove_line_tools mpage Aug 30, 2024 https://github.com/python/cpython/pull/123926/commits/82b456a301e29f9daaf053694a0f1079f5962a5b
b021704 Instrument thread-local bytecode mpage Sep 1, 2024 https://github.com/python/cpython/pull/123926/commits/b02170421a66969376075f9f1e3ba48f8e4870d9
aea69c5 Use locks for instrumentation mpage Sep 3, 2024 https://github.com/python/cpython/pull/123926/commits/aea69c56a7c33f95a454acc73ea253783e5c6e6a
552277d Add ifdef guards for each specialization family mpage Sep 3, 2024 https://github.com/python/cpython/pull/123926/commits/552277d8db532b1475fd5fa1396d72493515e9ee
50a6089 Specialize BINARY_OP mpage Sep 4, 2024 https://github.com/python/cpython/pull/123926/commits/50a6089a6c73b302ad991469aeb6bb893462339c
3f1d941 Limit the amount of memory consumed by bytecode copies mpage Sep 6, 2024 https://github.com/python/cpython/pull/123926/commits/3f1d94175e3bdab06156f6f0cc408f4fb444cacc
7d2eb27 Make thread-local bytecode limits user configurable mpage Sep 7, 2024 https://github.com/python/cpython/pull/123926/commits/7d2eb2750d13b40ca7df7a470d8e0778d61c487f
d5476b9 Fix a few data races when (de)instrumenting opcodes mpage Sep 8, 2024 https://github.com/python/cpython/pull/123926/commits/d5476b92a41190edb5a11243d4f716e832505bd8
e3b367a Make branch taken recording thread-safe mpage Sep 8, 2024 https://github.com/python/cpython/pull/123926/commits/e3b367a8351b799b6ed812332d5e756906051b94
b2375bf Lock thread-local bytecode when specializing mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/b2375bf9678dc4b362f9271968b57680f4aff962
2707f8e Load bytecode on RESUME_CHECK mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/2707f8e5d854b63f886472813bbab04ea4a55ee0
3fdcb28 Load tlbc on generator.throw() mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/3fdcb288e56e45b6681ffdf85fb095a58207fc49
4a55ce5 Use tlbc instead of thread_local_bytecode mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/4a55ce5924d2dd9c193325497413d3143f116b42
8b3ff60 Use tlbc everywhere mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/8b3ff60c1d5e97c8e0b3abdbfd663929a4d0a943
862afa1 Explicitly manage tlbc state mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/862afa181e2222106cf0a516a1513453bc59e86b
0b4d952 Refactor API for fetching tlbc mpage Sep 9, 2024 https://github.com/python/cpython/pull/123926/commits/0b4d9522652e1f2e9be8a80bbb7d2c4b65b5591a
7795e99 Add unit tests mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/7795e99a3220421f91a953eafb0d416aff203b4e
693a4cc Fix initconfig in default build mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/693a4cc96313506bc6678ba9123ba22ab711170d
b43531e Fix instrumentation in default build mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/b43531e1de1392cc7c7fc980f2354379cef05823
9025f43 Synchronize bytecode modifications between specialization and instrum… mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/9025f431aceeb44b1f8e532502d0554b2708818b
c44c7d9 Add a high-level comment mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/c44c7d902cf4a4c7326510d7888d0727de267931
e2a6656 Fix unused variable warning in default build mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/e2a6656c20e66880a7d73febccf75f638229eba7
e6513d1 Fix test_config in free-threaded builds mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/e6513d1a945f63826ace6f21c75e11bdec1a1774
a18396f Fix formatting mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/a18396fa60ea54b04e3a375c951fa27e0288f31a
81fe1a2 Remove comment mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/81fe1a213f2943e777cc0c4355e65dda52d8f117
837645e Fix data race in _PyInstruction_GetLength mpage Sep 10, 2024 https://github.com/python/cpython/pull/123926/commits/837645e31166e141149cc7a984ab832ac73d4896
f13e132 Fix tier2 optimizer mpage Sep 11, 2024 https://github.com/python/cpython/pull/123926/commits/f13e132eed50dba5f7e0382dd68dc30b5d27eb4a
942f628 Use __VA_ARGS__ for macros mpage Sep 11, 2024 https://github.com/python/cpython/pull/123926/commits/942f62898182d61cc889214de715391f06df6a16
66cb24d Update vcxproj files to include newly added files mpage Sep 11, 2024 https://github.com/python/cpython/pull/123926/commits/66cb24d82d6557cf07725f8bacf720dcc0134fab
ad12bd4 Mark unused params mpage Sep 11, 2024 https://github.com/python/cpython/pull/123926/commits/ad12bd42d7cd91d008cde3236a238a5f7f60bd56
1bbbbbc Keep tier2 and the JIT disabled in free-threaded builds mpage Sep 12, 2024 https://github.com/python/cpython/pull/123926/commits/1bbbbbc8dbbcbb4b0efc6b0a3067b1bdbfe289d3
e63e403 Only allow enabling/disabling tlbc mpage Sep 13, 2024 https://github.com/python/cpython/pull/123926/commits/e63e403641eccdb118dce4b0efaf42198adbc4e9
8b97771 Update libpython for gdb mpage Sep 13, 2024 https://github.com/python/cpython/pull/123926/commits/8b97771fb39e25e74f915455bd79f1f6a5310b79
d34adeb Merge branch 'main' into gh-115999-thread-local-bytecode mpage Sep 13, 2024 https://github.com/python/cpython/pull/123926/commits/d34adebb31aef54d0ceb6fd8e2abe9bdb8247ffe
6d4fe73 Handle out of memory errors mpage Sep 13, 2024 https://github.com/python/cpython/pull/123926/commits/6d4fe7354356fe2841e7600e88850595839ca3fc
c2d8693 Merge branch 'main' into gh-115999-thread-local-bytecode mpage Sep 17, 2024 https://github.com/python/cpython/pull/123926/commits/c2d86931f95c24b0a56408d7db6ac0b27efd67ea
b104782 Fix warnings on windows mpage Sep 17, 2024 https://github.com/python/cpython/pull/123926/commits/b10478268c1363a44b23005bb46e846e4f388268
deb5216 Fix another warning mpage Sep 18, 2024 https://github.com/python/cpython/pull/123926/commits/deb52167c1eefc3992f8a814d5feae92ba862d35
2f11cc7 Ugh actually fix it mpage Sep 18, 2024 https://github.com/python/cpython/pull/123926/commits/2f11cc781d891e2e9f9b793d8658680e79022586
04f1ac3 Add high-level comment about index pools mpage Sep 25, 2024 https://github.com/python/cpython/pull/123926/commits/04f1ac3d55e9f1e3526c2ec8af7e3a95895cc4ff
aa330b1 Merge branch 'main' into gh-115999-thread-local-bytecode mpage Sep 25, 2024 https://github.com/python/cpython/pull/123926/commits/aa330b1af21688aa3a81bb41a249f9d7c572aa79
7dfd1ca Merge branch 'main' into gh-115999-thread-local-bytecode mpage Sep 26, 2024 https://github.com/python/cpython/pull/123926/commits/7dfd1ca3b4261f7b79e3cf2ac6fe2caf11dac87b
7c9da24 Exclude tlbc from refleak counts mpage Sep 27, 2024 https://github.com/python/cpython/pull/123926/commits/7c9da242ef59824697e500ab0bab80420f516c22
dd144d0 Merge branch 'main' into gh-115999-thread-local-bytecode mpage Sep 28, 2024 https://github.com/python/cpython/pull/123926/commits/dd144d0d0794827c3c4bcda97ed13a34878dfd71
ad180d1 Regen files mpage Sep 28, 2024 https://github.com/python/cpython/pull/123926/commits/ad180d183c9f1bbe6689df21d35a4f1375574ef4
95d2264 Move `get_tlbc_blocks` into the sys module mpage Sep 30, 2024 https://github.com/python/cpython/pull/123926/commits/95d22644c85da15a87902ce7f4e43f71354d026f
b6380de Merge branch 'main' into gh-115999-thread-local-bytecode mpage Sep 30, 2024 https://github.com/python/cpython/pull/123926/commits/b6380de9f4aee1b98fbc8590b19df78fd484cc81
adb59ef Merge branch 'main' into gh-115999-thread-local-bytecode mpage Oct 5, 2024 https://github.com/python/cpython/pull/123926/commits/adb59ef10da8a3f909fd2475be264ca5a0087f96
39c947d Merge branch 'main' into gh-115999-thread-local-bytecode mpage Oct 10, 2024 https://github.com/python/cpython/pull/123926/commits/39c947d251ed9404a8701a30fd98a7e4d2c11001
2cc5830 Work around `this_instr` now being const mpage Oct 11, 2024 https://github.com/python/cpython/pull/123926/commits/2cc5830a28048165bd2710394283c31f38ef642c
96ec126 Make RESUME_CHECK cheaper mpage Oct 11, 2024 https://github.com/python/cpython/pull/123926/commits/96ec1262c71007055d89cfc0fa33fbeaee839400
5ecebd9 Pass tstate to _PyCode_GetTLBCFast mpage Oct 11, 2024 https://github.com/python/cpython/pull/123926/commits/5ecebd9f849432d17b08e6c8910517f9bfaa661a
815b2fe Rename test_tlbc.py to test_thread_local_bytecode.py mpage Oct 11, 2024 https://github.com/python/cpython/pull/123926/commits/815b2fed5bdab3acb463092bf574da4bb381712e
fb90d23 Remove per-family defines for specialization mpage Oct 11, 2024 https://github.com/python/cpython/pull/123926/commits/fb90d2376cc7a037208a8bd04af164d6fca1b347
4e42414 Replace bytecode pointer with tlbc_index mpage Oct 13, 2024 https://github.com/python/cpython/pull/123926/commits/4e424140daac45e736956810c58dba1c734f0250
814e4ca Add a test verifying that we clean up tlbc when the code object is de… mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/814e4ca4e54165a7081b1633eeaee1d5e078ee47
ba3930a Merge branch 'main' into gh-115999-thread-local-bytecode mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/ba3930aa904e43a039d9b8c1bbca662201859916
cb8a774 Fix indentation mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/cb8a7749031cb4bd45f39942820fd469f0c644bd
0f8a55b Clarify comment mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/0f8a55b151f2bb96ff553829a6486402859c7801
70ce0fe Fix TSAN mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/70ce0fe7a0ab8c8661b47171e8fce07ddd7b0668
f512353 Add test for cleaning up tlbc in correct place, not old emacs buffer mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/f512353e861da3d5b5f1017b17ae5c8bb158dbd9
4be2b1f Remove test_tlbc.py mpage Oct 14, 2024 https://github.com/python/cpython/pull/123926/commits/4be2b1fc3dc52620266250f974667cfbc6420264
61c7aa9 Merge branch 'main' into gh-115999-thread-local-bytecode mpage Oct 17, 2024 https://github.com/python/cpython/pull/123926/commits/61c7aa9981d9611a986d0864dfb0b8b8699f4cd6
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