RFR [9] 8153181: Examine sun.misc.VMSupport

[Mandy Chung]

Hi Chris,

Would jdk.internal.vm be appropriate for this VMSupoprt class?

VMSupport::getAgentProperties simply calls JVM_InitAgentProperties.  java.management could call JVM_InitAgentProperties directly.

src/jdk.jdwp.agent/share/native/libjdwp/util.c 
   JDWP calls it and needs to be updated.

VMSupport.getVMTemporaryDirectory() is for jdk.jvmstat to use and I suggest to move this method to jdk.internal.perf.Perf.

Mandy

> On Mar 31, 2016, at 9:02 AM, Chris Hegarty <chris.hegarty at oracle.com> wrote:
> 
> As part of JEP 260, all non-Critical APIs in sun.misc are being examined.
> 
> sun.misc.VMSupport is a utility class supporting two functions: 
>  1) the initialization of management Agent properties, and 
>  2) the retrieval of the VM temporary directory used by the attach and perf data files. 
> 
> The initialization of Agent properties is used statically by the java.managment module, 
> or can be provoked by a serviceability tool on a VM that has had an agent loaded in it. 
> The location of VM temporary files is a low-level interface between the libraries and VM. 
> For these reasons, VMSupport should remain in the base module, but be moved to an 
> internal package.
> 
> http://cr.openjdk.java.net/~chegar/8153181/00/
> https://bugs.openjdk.java.net/browse/JDK-8153181
> 
> -Chris.