CRR (S/M): 6929868 G1: introduce min / max young gen size bounds

Bengt Rutisson bengt.rutisson at oracle.com
Thu Sep 8 02:22:52 PDT 2011


Hi again,

John Cuthbertson reviewed Tony's change and Jesper reviewed mine. So, 
both Tony and I are all set to push.

Thanks John and Jesper!
Bengt


On 2011-09-07 23:23, Bengt Rutisson wrote:
>
> Hi again,
>
> I still need one more review for these changes. Anyone feel up to it? 
> It is not such a big change, but it is probably a good idea to first 
> review Tony's changes "CRR (M): 7084509: G1: fix inconsistencies and 
> mistakes in the young list target length calculations", which, by the 
> way, also need another review as far as I know...
>
> Bengt
>
> On 2011-09-01 15:01, Bengt Rutisson wrote:
>>
>> Hi all,
>>
>> I'd like one more review for this change (Tony has already reviewed it).
>>
>> http://cr.openjdk.java.net/~brutisso/6929868/webrev.01/
>>
>> The change is based on Tony's change that he has out for review in 
>> the thread "CRR (M): 7084509: G1: fix inconsistencies and mistakes in 
>> the young list target length calculations". Since the feature 
>> complete date for hs22 is creeping up on us I would like to get this 
>> reviewed already now rather than waiting for Tony's changes to go in.
>>
>> The change tries to make G1 more intuitive in the way it uses the 
>> command line flags for setting the young gen size.
>>
>> Here is a short summary of what the changes contain:
>>
>> * UseAdaptiveSizePolicy is ignored by G1
>> * Setting -Xmn is equivalent to setting -XX:NewSize == -XX:MaxNewSize 
>> and will keep the young gen size at the specified value
>> * If NewSize < MaxNewSize the young gen size will adjust to a value 
>> based on the pause target. But it will not go above MaxNewSize or 
>> below NewSize.
>> * If NewRatio is set the young gen size will only change when the 
>> heap size changes.
>> * NewSize and MaxNewSize overrides NewRatio if all of them are 
>> specified.
>>
>> CR:
>> 6929868 G1: introduce min / max young gen size bounds
>> http://monaco.us.oracle.com/detail.jsf?cr=6929868
>>
>> Thanks,
>> Bengt
>>
>>
>



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