Experiment: Merging hs-rt and hs-gc
mikael.vidstedt at oracle.com
Wed Jun 3 14:28:08 UTC 2015
Given that the feedback on this has been positive we're going to move
ahead with this experiment. The plan is to do a final integration from
jdk9/hs-gc up to jdk9/hs *tomorrow* and then lock down hs-gc. More
detailed information will be sent out in separate emails.
If you have feedback on how the experiment is working out please let us
On 2015-05-29 10:31, Mikael Vidstedt wrote:
> As you all know the JDK 9 development of Hotspot is done in three
> different mercurial forests: hs-rt, hs-gc and hs-comp. This
> division has served as a way of isolating changes from each other in
> order to get more testing done on them before they are shared to other
> forests. However, as a side effect of this the propagation time of
> fixes is also impacted, and in some cases we have seen fixes stuck for
> several weeks waiting for the respective forests to stabilize.
> We would like to propose an experiment, which will merge the hs-rt and
> hs-gc forests, having hs-rt be the forest through which all the hs-rt
> and hs-gc changes are integrated. For the duration of the experiment
> the hs-gc forest will be locked down so that no accidental
> integrations are made to it. This change would mean that the combined
> hs-rt gets more testing faster, and that the fix propagation time goes
> to zero for changes between hs-rt and hs-gc. The hs-comp forest will
> not be affected.
> We suggest that the experiment starts June 4th and goes on for at
> least two weeks (giving us some time to adapt in case of issues).
> Monitoring and evaluation of the new structure will take place
> continuously, with an option to revert back if things do not work out.
> This will remain an experiment for at least a few months, after which
> we will evaluate it and depending on the results consider making it
> the new standard. If so, the hs-gc forest will eventually be retired,
> with an option of looking at further reduction of forests going forward.
> It's worth pointing out explicitly that if you have any changes based
> on the hs-gc forest those changes would have to be rebased on top of
> hs-rt instead once the hs-gc forest has been locked down.
> Please let us know if you have any feedback or questions!
>  http://hg.openjdk.java.net/jdk9/hs-rt
>  http://hg.openjdk.java.net/jdk9/hs-gc
>  http://hg.openjdk.java.net/jdk9/hs-comp
More information about the hotspot-dev