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List: openjdk-serviceability-dev
Subject: Re: RFR: 8218743: SA: Add support for large bitmaps
From: Stefan Karlsson <stefan.karlsson () oracle ! com>
Date: 2019-02-14 9:12:18
Message-ID: 5b55d335-b9b5-fef2-9f78-7844f86dd844 () oracle ! com
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Thanks, Erik.
Stefank
On 2019-02-14 10:11, Erik Ă–sterlund wrote:
> Hi Stefan,
>
> Looks good.
>
> Thanks,
> /Erik
>
> On 2019-02-11 13:36, Stefan Karlsson wrote:
>> Hi all,
>>
>> Please review this patch to add support for large bitmaps in the SA.
>>
>> http://cr.openjdk.java.net/~stefank/8218743/webrev.01/
>> https://bugs.openjdk.java.net/browse/JDK-8218743
>>
>> I've added a minimal interface (at, atPut, clear) that uses longs
>> instead of ints, and changed MarkBits to use this interface.
>>
>> I've implemented a segmented bitmap that, currently, all GCs use when
>> asked for a bitmap in MarkBits. Later ZGC will provide its own
>> discontiguous bitmap, implementing the new interface, but that will be
>> sent out as a separate RFE.
>>
>> I've tested this with a temporary patch that lowers the segment size
>> and implements a jtreg test:
>> http://cr.openjdk.java.net/~stefank/8218743/webrev.test.01
>>
>> I ran through the all the tests in serviceability/sa with both these
>> patches.
>>
>> Thanks,
>> StefanK
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