[jdk21u-dev] RFR: 8322279: Generational ZGC: Use ZFragmentationLimit and ZYoungCompactionLimit as percentage instead of multiples

[Goetz Lindenmaier]

On Tue, 16 Jan 2024 03:40:14 GMT, Liang Mao <lmao at openjdk.org> wrote:

> This commit fixed incorrect use of production options of generational ZGC. Since JDK21 is the only LST version with generational ZGC， we need to fix the potential bugs.
> Additional testing on fastdebug against test/hotspot/jtreg/gc/z

Hi @mmyxym,
please give a risk estimate. What will be the effects of this this change? It looks as if a heurisitc will be changed by a factor of 100.
Will normal ZGC be affected? Any other GC?  Will pause time, heap size etc be affected?

-------------

PR Comment: https://git.openjdk.org/jdk21u-dev/pull/173#issuecomment-1893347027