RFR: Backport of 6412968 and 6990419 to 7u

Poonam Bajaj poonam.bajaj at oracle.com
Wed Feb 12 18:14:30 PST 2014


Hi,

Could I have some reviews on the following backport changes, please.
http://cr.openjdk.java.net/~poonam/6412968_6990419/webrev.01/

Thanks,
Poonam

On 2/11/2014 10:30 AM, Poonam Bajaj wrote:
> 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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