RFC: Draft JEP: Generational ZGC

[Leslie Zhai]

Hi Stefan,

gcc 8.3.0 failed to work after the commit 
7d0b267e87ec6120a74e5b6282c5e395786d2546: 
https://github.com/openjdk/zgc/commit/7d0b267e87ec6120a74e5b6282c5e395786d2546 


Building target 'images' in configuration 'linux-aarch64-server-fastdebug'
Updating support/modules_libs/java.base/server/libjvm.so due to 1 file(s)
/home/zhaixiang/zgc/src/hotspot/share/gc/z/zPageTable.cpp: In constructor 'ZPageTable::FoundOld::FoundOld()':
/home/zhaixiang/zgc/src/hotspot/share/gc/z/zPageTable.cpp:59:15: error: use of deleted function 'CHeapBitMap::CHeapBitMap(const CHeapBitMap&)'
      _current{0} {}
                ^
In file included from /home/zhaixiang/zgc/src/hotspot/share/memory/allocation.hpp:29,
                  from /home/zhaixiang/zgc/src/hotspot/share/classfile/classLoaderData.hpp:28,
                  from /home/zhaixiang/zgc/src/hotspot/share/precompiled/precompiled.hpp:34:
/home/zhaixiang/zgc/src/hotspot/share/utilities/bitMap.hpp:488:15: note: declared here
    NONCOPYABLE(CHeapBitMap);
                ^~~~~~~~~~~
/home/zhaixiang/zgc/src/hotspot/share/utilities/globalDefinitions.hpp:84:24: note: in definition of macro 'NONCOPYABLE'
  #define NONCOPYABLE(C) C(C const&) = delete; C& operator=(C const&) = delete /* next token must be ; */
                         ^
make[3]: *** [lib/CompileJvm.gmk:149: /home/zhaixiang/zgc/build/linux-aarch64-server-fastdebug/hotspot/variant-server/libjvm/objs/zPageTable.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [make/Main.gmk:252: hotspot-server-libs] Error 2

ERROR: Build failed for target 'images' in configuration 'linux-aarch64-server-fastdebug' (exit code 2)

So I just reverted the commit then continue my porting work.

How to compatible with low version GNU compiler?

Thanks,

Leslie Zhai

在 2022/10/17 下午5:47, Stefan Karlsson 写道:
> The development of Generational ZGC happens in this project branch:
> https://github.com/openjdk/zgc/tree/zgc_generational
>
> StefanK
>
> On 2022-10-14 14:47, Stefan Karlsson wrote:
>> Hi all,
>>
>> I have created a draft JEP for Generational ZGC. For details, see the 
>> JBS entry:
>>
>> https://bugs.openjdk.org/browse/JDK-8272979
>>
>> Comments and feedback are welcome.
>>
>> Thanks,
>> StefanK