On Mon, 9 Sep 2024 12:49:05 GMT, Roman Kennke wrote:
>>> If we get a promotion failure in the young gen, we are leaving the dead
>>> objects marked as forwarded.
>>
>> True; need to do sth like `obj->init_mark();` for the non-self-forwarded
>> case. The postcondition is that no forwarded objs
On Fri, 30 Aug 2024 18:10:44 GMT, Albert Mingkun Yang wrote:
>> FWIW, the ParallelGC does something very similar to what you propose, except
>> that it walks bitmaps instead of paring the space to find the self-forwarded
>> objects. It then has a check inside object_iterate to make sure that it
On Fri, 30 Aug 2024 11:15:23 GMT, Stefan Karlsson wrote:
>> I was thinking the same, but there's a problem with that. If we get a
>> promotion failure in the young gen, we are leaving the dead objects marked
>> as forwarded. Then when the Full GC scans these regions with dead objects it
>> wil
On Thu, 22 Aug 2024 17:12:09 GMT, Albert Mingkun Yang wrote:
>> Roman Kennke has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Remove hashcode leftovers from SA
>
> src/hotspot/share/gc/serial/defNewGeneration.cpp line 707:
>
>> 705:
On Fri, 30 Aug 2024 11:07:46 GMT, Stefan Karlsson wrote:
>> src/hotspot/share/gc/serial/defNewGeneration.cpp line 707:
>>
>>> 705: } else if (obj->is_forwarded()) {
>>> 706: // To restore the klass-bits in the header.
>>> 707: obj->forward_safe_init_mark();
>>
>> I wonder
On Fri, 30 Aug 2024 07:25:54 GMT, Stefan Karlsson wrote:
>> src/hotspot/share/gc/serial/serialArguments.cpp line 33:
>>
>>> 31: void SerialArguments::initialize_heap_flags_and_sizes() {
>>> 32: GenArguments::initialize_heap_flags_and_sizes();
>>> 33: GCForwarding::initialize_flags(MaxNewSize
On Thu, 22 Aug 2024 17:30:14 GMT, Albert Mingkun Yang wrote:
>> Roman Kennke has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Remove hashcode leftovers from SA
>
> src/hotspot/share/gc/serial/serialArguments.cpp line 33:
>
>> 31: void Se
On Thu, 22 Aug 2024 16:23:48 GMT, Roman Kennke wrote:
>> This is the main body of the JEP 450: Compact Object Headers (Experimental).
>>
>> It is also a follow-up to #20640, which now also includes (and supersedes)
>> #20603 and #20605, plus the Tiny Class-Pointers parts that have been
>> prev
> This is the main body of the JEP 450: Compact Object Headers (Experimental).
>
> It is also a follow-up to #20640, which now also includes (and supersedes)
> #20603 and #20605, plus the Tiny Class-Pointers parts that have been
> previously missing.
>
> Main changes:
> - Introduction of the (
On Thu, 22 Aug 2024 11:05:18 GMT, Roman Kennke wrote:
>> This is the main body of the JEP 450: Compact Object Headers (Experimental).
>>
>> Main changes:
>> - Introduction of the (experimental) flag UseCompactObjectHeaders. All
>> changes in this PR are protected by this flag. The purpose of t
> This is the main body of the JEP 450: Compact Object Headers (Experimental).
>
> Main changes:
> - Introduction of the (experimental) flag UseCompactObjectHeaders. All
> changes in this PR are protected by this flag. The purpose of the flag is to
> provide a fallback, in case that users unexp
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