Request for review (xs) - 8000325

Jon Masamitsu jon.masamitsu at oracle.com
Fri Nov 30 00:19:29 UTC 2012


Ramki,

My favorite javac test didn't show any difference but
my PrintGCStats script needs some work so I'm
not sure I'm looking at all of the stats correctly.
I have some refworkload runs going currently
and will see what pops out tomorrow.

Jon

On 11/29/12 15:17, Srinivas Ramakrishna wrote:
> Looks good. Would be great to prominently release-note this change 
> when it appears in a public/GA update/release.
>
> Out of curiosity, any perf data on CMS pause time diffs from this 
> change with current NPG?
>
> -- ramki
>
> On Thu, Nov 29, 2012 at 9:46 AM, Jon Masamitsu 
> <jon.masamitsu at oracle.com <mailto:jon.masamitsu at oracle.com>> wrote:
>
>     This is a change in the default class unloading policy for CMS.
>
>     8000325:        Change default for CMSClassUnloadingEnabled to true
>
>     http://cr.openjdk.java.net/~jmasa/8000325/webrev.00/
>     <http://cr.openjdk.java.net/%7Ejmasa/8000325/webrev.00/>
>
>     With perm gen removal it becomes important for CMS to unload
>     classes to avoid excessive consumption of native memory for
>     metadata.
>
>
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