RFR: Backport of 6412968 and 6990419 to 7u

Srinivas Ramakrishna ysr1729 at gmail.com
Thu Feb 13 01:00:01 PST 2014


Hi Poonam --

Awesome, thanks for doing the backport (and thanks to Yasumasa for the
original fixes)!  Are there performance numbers to share? (Unfortunately
the original jira's aren't publicly visible on openjdk, in case performance
data is attached there.)

Which version of 7u is this slated to make an appearance?

thanks!
-- ramki



On Wed, Feb 12, 2014 at 6:14 PM, Poonam Bajaj <poonam.bajaj at oracle.com>wrote:

>  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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