RFR: 8297186: G1 triggers unnecessary full GCs when heap utilization is low

[Thomas Schatzl]

On Thu, 17 Nov 2022 23:41:08 GMT, Man Cao <manc at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this change that better enforces that after gc there is at least one eden region to allocate into?
>> 
>> That avoids the problem described in the PR.
>> 
>> Thanks,
>>   Thomas
>
> src/hotspot/share/gc/g1/g1Policy.cpp line 191:
> 
>> 189: 
>> 190: void G1Policy::update_young_length_bounds() {
>> 191:   assert_at_safepoint();
> 
> This assertion seems to fail in pre-submit build. Might come from G1Policy::init()?

We should also allow for initialization/startup. Fixed.

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PR: https://git.openjdk.org/jdk/pull/11209