On Thu, 19 Sep 2024 11:43:12 GMT, Thomas Stuefe <stu...@openjdk.org> wrote:
>> src/hotspot/share/oops/compressedKlass.cpp line 231: >> >>> 229: // The reason is that we want to avoid, if possible, shifts larger >>> than >>> 230: // a cacheline size. >>> 231: _base = addr; >> >> Why is this important? > > It lessens the cache effects of Klass hyperaligning. Note that if we go with my KLUT proposal for post-Lilliput (the GC oop iteration improvements), this will not matter anymore and can be simplified to a fixed shift of 10. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1766688756
