Skip to content

8339960: GenShen: Fix inconsistencies in generational Shenandoah behavior #497

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 26 commits into from

Conversation

kdnilsen
Copy link
Contributor

@kdnilsen kdnilsen commented Sep 11, 2024

This fixes some bugs found in recent code review and playback of an assertion failure.


Progress

  • Change must not contain extraneous whitespace
  • Commit message must refer to an issue
  • Change must be properly reviewed (1 review required, with at least 1 Committer)

Issue

  • JDK-8339960: GenShen: Fix inconsistencies in generational Shenandoah behavior (Bug - P4)

Reviewers

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/shenandoah.git pull/497/head:pull/497
$ git checkout pull/497

Update a local copy of the PR:
$ git checkout pull/497
$ git pull https://git.openjdk.org/shenandoah.git pull/497/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 497

View PR using the GUI difftool:
$ git pr show -t 497

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/shenandoah/pull/497.diff

Webrev

Link to Webrev Comment

When we round up, we introduce the risk that the new size exceeds the
maximum LAB size, resulting in an assertion error.
@bridgekeeper
Copy link

bridgekeeper bot commented Sep 11, 2024

👋 Welcome back kdnilsen! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

@openjdk
Copy link

openjdk bot commented Sep 11, 2024

@kdnilsen This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8339960: GenShen: Fix inconsistencies in generational Shenandoah behavior

Reviewed-by: wkemper

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 2 new commits pushed to the master branch:

  • b7405b1: 8339870: Remove yet more stale TODOs
  • 08c6411: 8339695: GenShen: Concurrent reset performance has regressed

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

@@ -1424,10 +1425,14 @@ void ShenandoahFreeSet::find_regions_with_alloc_capacity(size_t &young_cset_regi
old_collector_leftmost, old_collector_rightmost, old_collector_leftmost_empty, old_collector_rightmost_empty,
old_collector_regions, old_collector_used);

_partitions.establish_mutator_intervals(mutator_leftmost, mutator_rightmost, mutator_leftmost_empty, mutator_rightmost_empty,
idx_t rightmost_idx = (mutator_leftmost == max_regions)? -1: (idx_t) mutator_rightmost;
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Does this also affect upstream? Should we have a non-genshen patch too?

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

We should do this upstream as well. (or it will go upstream when we merge, but that might take a while). I wanted to test and integrate "quickly" into our internal test distribution.

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@kdnilsen kdnilsen changed the title Generational gc fixes 8339960: GenShen: Fix inconsistencies in generational Shenandoah behavior Sep 11, 2024
@openjdk openjdk bot added the rfr Pull request is ready for review label Sep 11, 2024
@mlbridge
Copy link

mlbridge bot commented Sep 11, 2024

Webrevs

@openjdk openjdk bot added the ready Pull request is ready to be integrated label Sep 13, 2024
@kdnilsen
Copy link
Contributor Author

/integrate

@openjdk
Copy link

openjdk bot commented Sep 13, 2024

Going to push as commit 1a7d597.
Since your change was applied there have been 2 commits pushed to the master branch:

  • b7405b1: 8339870: Remove yet more stale TODOs
  • 08c6411: 8339695: GenShen: Concurrent reset performance has regressed

Your commit was automatically rebased without conflicts.

@openjdk openjdk bot added the integrated Pull request has been integrated label Sep 13, 2024
@openjdk openjdk bot closed this Sep 13, 2024
@openjdk openjdk bot removed ready Pull request is ready to be integrated rfr Pull request is ready for review labels Sep 13, 2024
@openjdk
Copy link

openjdk bot commented Sep 13, 2024

@kdnilsen Pushed as commit 1a7d597.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
integrated Pull request has been integrated
Development

Successfully merging this pull request may close these issues.

2 participants