RFR: 8218746: SA: Implement discontiguous bitmap for ZGC
stefan.karlsson at oracle.com
Thu Feb 14 16:53:42 UTC 2019
On 2019-02-14 17:04, Jini George wrote:
> Hi Stefan,
> Looks good to me. Nit: Could you please modify the copyright year? And
> don't we have to add the copyright message to the new file
> ZExternalBitMap.java ?
Thanks. I've gone through all my SA patches and updated the copyright year.
> On 2/11/2019 7:25 PM, Stefan Karlsson wrote:
>> Hi all,
>> Please review this patch to implement a discontiuous bitmap for ZGC
>> in the SA.
>> ZGC uses a 16TB virtual memory address range, so the normal scheme to
>> map a bitmap over the entire address range uses too much memory. This
>> patch lazily creates smaller bitmaps per ZPage, when at() or atPut()
>> is called.
>> This patch builds upon JDK-8218743.
>> Tested with serviceability/sa and manually running Reverse Object
>> Analysis in the SA.
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