Proposal for back-porting JFR to OpenJDK8u

[李三红(三红)]

Hi, 
Thanks for all comments, let's concentrate a bit on how should we proceed further with this work.
Maybe we can consider shared repo(Oracle helps on creating this?) so that Alibaba can post patches and hopefully everybody can collaboratively work on this.

Thanks!
Sanhong
-----邮件原件-----
发件人: jdk8u-dev [mailto:jdk8u-dev-bounces at openjdk.java.net] 代表 Volker Simonis
发送时间: 2018年12月11日 22:47
收件人: Andrew Haley <aph at redhat.com>
抄送: jdk8u-dev <jdk8u-dev at openjdk.java.net>
主题: Re: Proposal for back-porting JFR to OpenJDK8u

On Tue, Dec 11, 2018 at 10:59 AM Andrew Haley <aph at redhat.com> wrote:
>
> On 12/11/18 8:34 AM, Volker Simonis wrote:
>
> > I think it would be good to have a staging repository for this 
> > purpose. For the PowerPC/AIX port we had a "porting" repository 
> > where we freely committed changes and fixed bugs (without JBS bug 
> > IDs and without the usual review process). After that, when we were 
> > confident that the port is in a good shape, we created a staging 
> > repository. For pushes into the staging repository, we cut the 
> > changes from the "porting" repo into handy pieces, we created JBS 
> > issues for them and reviewed them on the corresponding mailing lists 
> > (e.g. hostspot-dev, core-libs-dev, etc).
>
> I see some advantages to doing that, but it'd be too much for us to do 
> to begin with. Let's concentrate for now on the smaller patches and 
> bug fixes that we have to do.
>
> > Repositories have to belong to a project but I don't think it makes 
> > sense to create a new project just for the sake of downporting JFR.
>
> Indeed not, no.
>
> > If we want to get started right away
>
> I don't, but we can certainly start thinking about it.
>
> I know that substantial feature backports like JFR are exciting and 
> interesting, but that's not the main part of the job. Let's not get 
> too distracted by JFR from the practical business of making jdk8u work
> well: we're in this for the long haul.
>

I totally agree. JFR shouldn't be part of the first community-baked 8u release.

But creating a new forest under jdk8u shouldn't be too complicated.
And once it's there, the people interested in the JFR downport can start to work collaboratively on the downport without "disturbing" the main jdk8u work.

> --
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671