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Per-interpreter runtime state and a process-wide GC stop-the-world - #8517

Merged

youknowone merged 27 commits into

RustPython:mainfrom

youknowone:subinterpreter-foundation

Aug 16, 2026

Merged

Per-interpreter runtime state and a process-wide GC stop-the-world#8517
youknowone merged 27 commits into
RustPython:mainfrom
youknowone:subinterpreter-foundation

Commits on Aug 15, 2026
- vm: add per-interpreter runtime state and interpreter registry
  youknowone
  committed
  5c341d2
- gc: stop every interpreter while collecting
  youknowone
  committed
  43f4b23
- vm: scope the interpreter registry per thread without threading
  youknowone
  committed
  ffd3d1e
- vm: keep the interpreter registry usable across bootstrap, drop and fork
  youknowone
  committed
  0079994
- vm: attach and detach thread slots when switching interpreters
  youknowone
  committed
  8f108ff
- vm: list only the current interpreter's subclasses
  youknowone
  committed
  696a8c1
- gc: give each interpreter its own collector state
  youknowone
  committed
  562b657
- _queue, _thread: detach before taking locks held across waits
  youknowone
  committed
  30e2020
- _io, _winapi: detach on the remaining stopped-holdable lock takes
  youknowone
  committed
  5ce062e
- gc: size the interpreter owner tag to the header padding
  youknowone
  committed
  87b6c68
- vm: reuse cleared frame blocks and shorten interpreter hot paths
  youknowone
  committed
  fd27902
- gc, vm: address review notes on owner tags and interpreter docs
  youknowone
  committed
  c3fcc70
- vm: gate interpreter registration on stop-the-world admission
  youknowone
  committed
  57428cd
- gc: keep the tracking counters off the barrier path
  youknowone
  committed
  8d07831
- dict: settle lookups and iteration steps under one read guard
  youknowone
  committed
  4e518d3
- vm: build a call's argument vector once
  youknowone
  committed
  eb94daf
- vm: reach an instance dict without cloning it
  youknowone
  committed
  f70db35
- vm: shorten the per-instruction safepoint and the call preamble
  youknowone
  committed
  4a76424
- vm: give KwArgs a zero-sized hasher
  youknowone
  committed
  b0f0dcc
- vm: promote borrowed stack refs before a yield
  youknowone
  committed
  f9bbc6d
- vm: run the exact-args vectorcall on a heap frame again
  youknowone
  committed
  b4bb43c
Commits on Aug 16, 2026

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Per-interpreter runtime state and a process-wide GC stop-the-world - #8517

Per-interpreter runtime state and a process-wide GC stop-the-world#8517
youknowone merged 27 commits into
RustPython:mainfrom
youknowone:subinterpreter-foundation

Commits on Aug 15, 2026

vm: add per-interpreter runtime state and interpreter registry

gc: stop every interpreter while collecting

vm: scope the interpreter registry per thread without threading

vm: keep the interpreter registry usable across bootstrap, drop and fork

vm: attach and detach thread slots when switching interpreters

vm: list only the current interpreter's subclasses

gc: give each interpreter its own collector state

_queue, _thread: detach before taking locks held across waits

_io, _winapi: detach on the remaining stopped-holdable lock takes

gc: size the interpreter owner tag to the header padding

vm: reuse cleared frame blocks and shorten interpreter hot paths

gc, vm: address review notes on owner tags and interpreter docs

vm: gate interpreter registration on stop-the-world admission

gc: keep the tracking counters off the barrier path

dict: settle lookups and iteration steps under one read guard

vm: build a call's argument vector once

vm: reach an instance dict without cloning it

vm: shorten the per-instruction safepoint and the call preamble

vm: give KwArgs a zero-sized hasher

vm: promote borrowed stack refs before a yield

vm: run the exact-args vectorcall on a heap frame again

Commits on Aug 16, 2026

vm: release a tail call's function at the callee's return

vm: stop copying a running frame's locals when it materializes

vm: key data stack frame reuse on the exact frame size

vm: store the frame object payload address in the cross-thread slot

vm: copy a foreign thread's frames instead of linking them

vm: resolve the two rustdoc links this branch added