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GeezerVison is showing github.com — gh-159137: Restore known-root marking for the GIL garbage collector by pablogsal · Pull Request #159162 · python/cpython

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@pablogsal

@pablogsal pablogsal commented Oct 11, 2026 •
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Part of gh-159137.

This brings back known-root marking for full collections in the GIL build. This was added it to the incremental collector in #127110, and it was removed when #148746 restored the generational collector. Excluding objects already known to be alive from trial reference counting is still useful without incremental collection. The free-threaded mark-alive pass in #128808 uses the same underlying idea.

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@bedevere-app bedevere-app Bot mentioned this pull request Oct 11, 2026
Speed up garbage collector #159137
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@pablogsal
pablogsal requested a review from nascheme October 11, 2026 02:41
@pablogsal
pablogsal marked this pull request as ready for review October 11, 2026 02:41
@bedevere-app bedevere-app Bot added the awaiting core review label Oct 11, 2026
@pablogsal
pablogsal force-pushed the gh-159137-restore-gc-root-marking branch from fa6d878 to 7bf0330 Compare October 11, 2026 02:49
@pablogsal
pablogsal requested a review from ericsnowcurrently as a code owner October 11, 2026 02:49
@pablogsal
pythongh-159137: Restore known-root marking for the GIL garbage colle…
945ef05 
…ctor
@pablogsal
pablogsal force-pushed the gh-159137-restore-gc-root-marking branch from 7bf0330 to 945ef05 Compare October 11, 2026 03:07
@pablogsal

pablogsal commented Oct 12, 2026

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Closing this PR. I’ve learned that @brandtbucher's mentee has been working on something very close to this for a while and was planning to open source it once a few things cleared up. Rather than duplicate that effort, I’d prefer to focus on their work and help get it upstream, so I’ll be following up on that instead :)
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@pablogsal pablogsal closed this Oct 12, 2026
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@nascheme nascheme Awaiting requested review from nascheme
@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner

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@pablogsal
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