RFR: Backport of 6412968 and 6990419 to 7u

[Poonam Bajaj]

Hi,

As per Jon Masamitsu's suggestion, we would be having the 
CMSParallelInitialMarkEnabled and CMSEdenChunksRecordAlways flags' value 
'false' by default for 7u so as not to introduce any behavior changes in 
7 update release. The updated webrev is here:
http://cr.openjdk.java.net/~poonam/6412968_6990419/webrev.01/

Thanks,
Poonam

On 2/9/2014 5:13 PM, Poonam Bajaj wrote:
> Hi All,
>
> Could I have some reviews for the backport of the following two fixes 
> from jdk8 to 7u:
> 6412968 <https://bugs.openjdk.java.net/browse/JDK-6412968>: CMS: Long 
> initial mark pauses
> 6990419 <https://bugs.openjdk.java.net/browse/JDK-6990419>: CMS: 
> Remaining work for 6572569: consistently skewed work distribution in 
> (long) re-mark pauses
>
> These changes parallelize the initial-mark phase of the CMS collector 
> and improve the work distribution among parallel worker threads.
> Webrev: http://cr.openjdk.java.net/~poonam/6412968_6990419/webrev.00/
>
> Original fixes:
> 6412968 : http://hg.openjdk.java.net/hsx/hsx25/hotspot/rev/ca9dedeebdec
> 6990419: http://hg.openjdk.java.net/hsx/hsx25/hotspot/rev/7b06ae405d7b
>
> Testing:
> JPRT, Customer verification testing
>
> Thanks,
> Poonam
>
>
>
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