8036698: Add trace event for updates to metaspace gc threshold Reviewed-by: stefank, mgerdin

8036696: Add metaspace gc threshold to metaspace summary trace event Reviewed-by: jmasa, stefank, mgerdin

8036673: G1: Abort weak reference processing if mark stack overflows Reviewed-by: brutisso, tschatzl

8036672: G1: alloc_purpose in copy_to_survivor_space() used incorrectly Reviewed-by: brutisso, tschatzl

Merge

Merge

8037407: G1: Remove heapRegionSets.cpp Reviewed-by: tschatzl, pliden

8036860: Pad and cache-align the BiasedMappedArray Summary: Pad and cache-align BiasedMappedArray instances by default to avoid performance variability problems due to false sharing, as instances of this data structures are typically used for performance sensitive code. Reviewed-by: brutisso, stefank

8035330: Remove G1ParScanPartialArrayClosure and G1ParScanHeapEvacClosure Summary: Mentioned closures are actually wrapped methods. This adds confusion to readers, and in this case also increases code size as G1ParScanHeapEvacClosure is part of the oop_oop_iterate() methods. Move them into G1ParScanThreadState as methods. Reviewed-by: stefank

8034868: Extract G1 From Card Cache into separate class Summary: Refactor the From Card Cache into a separate class. Reviewed-by: jmasa

8035654: Add times for evacuation failure handling in "Other" time Summary: Detailed breakdown of time spent in the evacuation failure handling phases to make the "Other" time roughly correspond to the sum of its parts. Reviewed-by: jwilhelm, jmasa

8035398: Add card redirty time in "Other" time in G1 Summary: Show the time taken by card redirtying during GC in a new "Redirty Cards" line. Reviewed-by: jwilhelm, brutisso

8027295: Free CSet takes ~50% of young pause time Summary: Improve fast card cache iteration and avoid taking locks when freeing the collection set. Reviewed-by: brutisso

8035815: Cache-align and pad the from card cache Summary: The from card cache is a very frequently accessed data structure. It is essentially a 2d array of per-region values, one row of values for every GC thread. Pad and align the data structure to avoid false sharing. Reviewed-by: stefank

8035406: Improve data structure for Code Cache remembered sets Summary: Change the code cache remembered sets data structure from a GrowableArray to a chunked list of nmethods. This makes the data structure more amenable to parallelization, and decreases freeing time. Reviewed-by: mgerdin, brutisso