On Tue, 22 Feb 2022 16:18:24 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
>
> Aleksey Shipilev has updated the pull request incrementally with one 
> additional commit since the last revision:
> 
>   Also specialize by workflow

I think this is pretty simple, so I shall be integrating with one review. Or 
anyone else may put stamp their review on it :)

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

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