RFR: 8152896: Convert PrintCompressedOopsMode to Unified Logging

[Thomas Stüfe]

Hi Rachel,

one question, does this change the output for -XX:PrintCompressedOopsMode
much? It seems to be wired now to "LOG_TAGS(gc, heap)", which prints much
more than just heap reservation for the compressed oops mode. Would it be
possible to add a "coops" tag or similar to isolate this output?

The reason I ask is that we used this flag extensively when optimizing heap
reservation on AIX for compressed oops, and may want to continue using it
or an alternative which gives the same output.

Kind Regards, Thomas


On Tue, Apr 5, 2016 at 8:00 PM, Rachel Protacio <rachel.protacio at oracle.com>
wrote:

> Hello,
>
> Please review this change, converting -XX:+PrintCompressedOopsMode to
> -Xlog:gc+heap. The existing diagnostic flag has been aliased to the info
> level of this tagset (for the "Heap address" message that for example
> appears in the hs_err file), and there are both debug and trace levels of
> logging available as well, as per our established schema for assigning
> levels.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8152896
> Open webrev: http://cr.openjdk.java.net/~rprotacio/8152896.00/
>
> Passes JPRT and RBT quick/non-colo tests.
>
> Thanks!
> Rachel
>