Request for assistance: Verify and update mailing list filter rules for jdk/jdk in preparation for Skara transition

Kevin Rushforth kevin.rushforth at
Mon Aug 31 13:11:42 UTC 2020

The minimum number of reviewers will remain at 1. Any "R"eviewer can 
raise the minimum usnig the `/reviewers` command, for example:

/reviewers 2

This will then require 2 reviewers. We use this for JavaFX and it has 
worked well. Having certain areas (e.g., 2d, swing, awt) default to 
`/reviewers 2` might be a useful RFE for Skara (Erik or Robin can 
comment as to whether they thing this is feasible).

I can't think of any good way for automated tooling to be able to 
recognize that the "right sort" of reviewers with the right expertise 
(someone from 2D someone from build, etc) have reviewed it.

-- Kevin

On 8/29/2020 9:34 AM, Philip Race wrote:
> I have some questions which at least tangentially relate to the list 
> mappings which raise
> what to me are tricky problems but maybe they've already been thought 
> through and solved.
> First, what is the minimum number of reviewers required a fix for the 
> JDK project ?
> Second, how can we have that by default adjusted depending on mailing 
> list, with the
> ability to either raise or lower that number according to the 
> judgement of the fixer.
> In the client area 2 reviewers is the big rule, only one has to be a 
> Capital R reviewer,
> but for trivial and urgent fixes we allow just one reviewer.
> Third, if a fix is cross-posted to (say) build-dev and 2d-dev, how do 
> you ensure it
> gets both a build reviewer and a 2D reviewer's approval before pushing 
> ? That
> is after all the point of the cross-posting.
> -phil.
> On 8/27/20, 10:37 AM, Joe Darcy wrote:
>> Hello,
>> The mapping of 
>> changed-file-to-OpenJDK-mailing-list(s)-to-review-the-file can be 
>> non-obvious, both to new contributors and to experienced contributors 
>> working in an unfamiliar area. If an automated mapping gets this 95+% 
>> correct, with the ability for manual tweaking, that strikes me as an 
>> overall improvement over the current situation.
>> The current mapping has various entries that should be changed, but 
>> that is why it is being sent out for review before the Skara 
>> transition :-)
>> As a general comment, I would expect both the mapping and other 
>> aspects of the Skara tooling to get updated in response to feedback 
>> after jdk/jdk moves over.
>> -Joe
>> On 8/27/2020 9:53 AM, Igor Ignatyev wrote:
>>> Hi Robin,
>>> although I really like the idea of having mapping b/w files and 
>>> groups/components/subcomponents, I agree w/ David that in its 
>>> *current* form it's unworkable. having the mapping in Skara repo is 
>>> impractical, as it introduces additional overhead for maintenance, 
>>> not to speak of possible desynchronization. Thus I suggest moving 
>>> the mapping to jdk/jdk repo and updating Skara tooling accordingly.
>>> I also have a question regarding the format, why did you decide to 
>>> invent your own format instead of using CODEOWNER-like format which 
>>> fits the needs rather nicely and is used for similar purposes by 
>>> github and gitlab?
>>> Thanks,
>>> -- Igor
>>>> On Aug 27, 2020, at 6:26 AM, David Holmes <david.holmes at> 
>>>> wrote:
>>>> In all seriousness I just don't think this is a reasonable or 
>>>> necessary thing to do. When you create a PR you should specify the 
>>>> mailing lists to be used, as you do today with a RFR. Trying to 
>>>> maintain a file by file mapping is just a huge initial setup cost 
>>>> and a maintenance nightmare. It is not necessary to try and 
>>>> automate this IMO.
>>>> I wish this intent had been flagged/discussed some time ago. :(
>>>> David
>>>> -----
>>>> On 27/08/2020 8:34 pm, Robin Westberg wrote:
>>>>> Hi all,
>>>>> As part of transitioning the jdk/jdk repository to Git with 
>>>>> project Skara, we have created a set of rules that determine which 
>>>>> mailing list(s) should be the default recipient of a review 
>>>>> request, depending on which files are changed. The initial version 
>>>>> of these rules was created by looking at historical commits and 
>>>>> matching them with existing mailing list review threads. This has 
>>>>> produced a reasonable basis, but it can most certainly be made 
>>>>> better with some additional manual curating.
>>>>> Therefore, it would be very helpful if people with good knowledge 
>>>>> of the various subsystems and source files that make up the JDK 
>>>>> would be willing to take a look at these rules, and also suggest 
>>>>> improvements where needed. In addition, lists like [1] would also 
>>>>> be very useful insofar they exist.
>>>>> The current version of these rules is located in a JSON file in 
>>>>> the Skara repository at [2]. In order to check the validity of the 
>>>>> rules, there is also a CLI tool that can be used to apply it to 
>>>>> either a subset of files or existing commits and produce a 
>>>>> suggestion [3] [4]. If you are interested in helping out with 
>>>>> curating these rules, these are the steps to get started:
>>>>> 1. Install the Skara CLI tools: 
>>>>> 2. Locate a suitable clone of the jdk/jdk repository (either 
>>>>> Mercurial or Git is fine)
>>>>> 3. Change (cd) to the root of your jdk/jdk repository
>>>>> 3. Run the “debug mlrules” command on your favorite subset of 
>>>>> files, for example like this (use the actual location of jdk.json 
>>>>> on your system):
>>>>> $ git skara debug mlrules -v 
>>>>> ~/git/skara/config/mailinglist/rules/jdk.json src/hotspot/share/jfr/
>>>>> Reading rules file...
>>>>> src/hotspot/share/jfr/dcmd: [hotspot-jfr-dev]
>>>>> src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp: 
>>>>> [hotspot-jfr-dev]
>>>>> src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.hpp: 
>>>>> [hotspot-jfr-dev]
>>>>> src/hotspot/share/jfr/instrumentation/jfrJvmtiAgent.cpp: 
>>>>> [hotspot-jfr-dev, serviceability-dev]
>>>>>>>>>> Final list suggestion is: [hotspot-jfr-dev, serviceability-dev]
>>>>> The command accepts multiple folder and/or file names to make it 
>>>>> possible to simulate a potential change to a given set of files:
>>>>> $ git skara debug mlrules -v 
>>>>> ../skara/config/mailinglist/rules/jdk.json doc/ 
>>>>> src/hotspot/cpu/x86/ src/hotspot/os/linux/gc/z/zNUMA_linux.cpp
>>>>> Reading rules file...
>>>>> doc: [build-dev]
>>>>> src/hotspot/cpu: [hotspot-compiler-dev]
>>>>> src/hotspot/os: [hotspot-runtime-dev, hotspot-gc-dev]
>>>>> Combined list suggestion: [build-dev, hotspot-compiler-dev, 
>>>>> hotspot-gc-dev, hotspot-runtime-dev]
>>>>> Final list suggestion is: [build-dev, hotspot-dev]
>>>>> If the suggestions look fine, all is well. If not, you are welcome 
>>>>> to propose a change to the rules, preferably by editing the 
>>>>> jdk.json file [6] and creating a pull request towards the Skara 
>>>>> project as described in [5]. Coincidentally, this is the same way 
>>>>> that future changes to the jdk/jdk repository will be integrated, 
>>>>> so this exercise could also serve as a way of getting started with 
>>>>> Git / Skara!
>>>>> Best regards,
>>>>> Robin
>>>>> [1]
>>>>> [2] 
>>>>> [3]
>>>>> $ git skara debug mlrules -v 
>>>>> ~/git/skara/config/mailinglist/rules/jdk.json 
>>>>> src/java.desktop/unix/native
>>>>> Reading rules file...
>>>>> src/java.desktop/unix/native/common: [2d-dev]
>>>>> src/java.desktop/unix/native/include: []
>>>>> src/java.desktop/unix/native/libawt: [2d-dev]
>>>>> src/java.desktop/unix/native/libawt_headless: [awt-dev]
>>>>> src/java.desktop/unix/native/libawt_xawt: [awt-dev]
>>>>> src/java.desktop/unix/native/libfontmanager: [2d-dev]
>>>>> src/java.desktop/unix/native/libjawt: [awt-dev]
>>>>> src/java.desktop/unix/native/libsplashscreen: [awt-dev]
>>>>> Combined list suggestion: [2d-dev, awt-dev]
>>>>> Final list suggestion is: [2d-dev, awt-dev]
>>>>> [4]
>>>>> $ git skara debug mlrules -d 30 -v 
>>>>> ~/git/skara/config/mailinglist/rules/jdk.json .
>>>>> ...
>>>>> ✅ [2d-dev, awt-dev, serviceability-dev] c32923e0: 8240487: Cleanup 
>>>>> whitespace in .cc, .hh, .m, and .mm files
>>>>> ❌ [awt-dev] 7f74c7dd: 8212226: SurfaceManager throws "Invalid 
>>>>> Image variant" for MultiResolutionImage (Windows)
>>>>>      Suggested lists: [2d-dev, awt-dev]
>>>>>      Rules matching unmentioned lists [2d-dev]:
>>>>> src/java.desktop/share/classes/sun/java2d/ - 
>>>>> [2d-dev: ^src/java.desktop/share/classes/sun/java2d/]
>>>>>>>>>> [5]
>>>>> [6]
>>>>> The rules are made up of sets of regular expressions for the 
>>>>> various mailing lists that are used for reviewing changes going 
>>>>> into the JDK. If any rule matches, that mailing list will get a 
>>>>> copy of the review request email. For directories containing files 
>>>>> that belong to different subsystems, it’s usually a good idea to 
>>>>> write the rules in a complementary fashion if possible, so that 
>>>>> anything not explicitly mentioned gets a reasonable default. As an 
>>>>> example, see these rules for a subset of awt / 2d / i18n files:
>>>>> “awt-dev”: 
>>>>> "src/java.desktop/share/classes/sun/awt/(?!font|sunhints|color/|font/|geom/|im/|image/|print/)”
>>>>> “2d-dev”: 
>>>>> "src/java.desktop/share/classes/sun/awt/(font|sunhints|color/|font/|geom/|image/|print/)"
>>>>> “I18n-dev”: "src/java.desktop/share/classes/sun/awt/im/“
>>>>> In this example, anything not explicitly indicated as belonging to 
>>>>> either 2d-dev or i18-dev will be matched by awt-dev.

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