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  • !2257

Closed
Opened Dec 01, 2019 by Ben Gamari@bgamari🐢Maintainer
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Check out, review, and merge locally

Step 1. Fetch and check out the branch for this merge request

git fetch origin
git checkout -b "wip/gc/clear-bitmap-during-sweep" "origin/wip/gc/clear-bitmap-during-sweep"

Step 2. Review the changes locally

Step 3. Merge the branch and fix any conflicts that come up

git fetch origin
git checkout "master"
git merge --no-ff "wip/gc/clear-bitmap-during-sweep"

Step 4. Push the result of the merge to GitLab

git push origin "master"

Note that pushing to GitLab requires write access to this repository.

Tip: You can also checkout merge requests locally by following these guidelines.

nonmoving: Clear segment bitmaps during sweep

  • Overview 16
  • Commits 1
  • Pipelines 1
  • Changes 3

Previously we would clear the bitmaps of segments which we are going to sweep during the preparatory pause. However, this is unnecessary: the existence of the mark epoch ensures that the sweep will correctly identify non-reachable objects, even if we do not clear the bitmap.

We now defer clearing the bitmap to sweep, which happens concurrently with mutation.

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9.0.1
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Reference: ghc/ghc!2257
Source branch: wip/gc/clear-bitmap-during-sweep