RFR: JDK-8201483 Make it possible to disable JVM features

David Holmes david.holmes at oracle.com
Thu Apr 12 12:15:31 UTC 2018


Hi Magnus,

On 12/04/2018 9:39 PM, Magnus Ihse Bursie wrote:
> It is currently easy to add new JVM features to the JVM build, but it is 
> not possible to remove features.
> 
> With this change, features can be both added or removed from the default 
> set. They are added using --with-jvm-features=f1,f2 and removed using 
> --with-jvm-features=-f1,-f2. The syntax can be combined, so 
> --with-jvm-features=dtrace,-nmt will enable dtrace but disable native 
> memory tracking.

I need to point out that we have never tested disabling individual VM 
features likes this. They are either all on, or all off for the minimal 
VM! There may be implicit dependencies between features.

David

> I also included some additional code cleanup and fixes, such as printing 
> the JVM feature set at the summary.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8201483
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8201483-disable-JVM-features/webrev.01
> 


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