On Tue, 22 Feb 2022 07:05:40 GMT, Aleksey Shipilev <sh...@openjdk.org> wrote:

> Since last year, GHA allows concurrency control over GHA runs:
>  
> https://github.blog/changelog/2021-04-19-github-actions-limit-workflow-run-or-job-concurrency/
>  
> https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
> 
> Our GHA workflows trigger on every PR update, sometimes doing multiple runs 
> per PR. This is seldom useful and wastes resources with our very large jobs. 
> For example, one can push a commit, quickly realize there is a mistake, push 
> another commit, and this would do *two* GHA runs, both taking many hours.
> 
> I think we can say that only one run per branch is good, and all 
> running/pending runs should be cancelled when a new run starts.
> 
> Additional testing:
>  - [x] Verified queued run gets cancelled on new commit
>  - [x] Verified in-progress run gets cancelled on new commit
>  - [x] Verified in-progress run gets cancelled on merge
>  - [x] Verified in-progress run gets cancelled on rebase + force-push

Looks good.

-------------

Marked as reviewed by ihse (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7570

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