Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps.
Reviewed-by: mgerdin, brutisso, jwilhelm

Summary: Wrapped memory with standard bounds checking "GuardedMemory".
Reviewed-by: zgu, fparain, dcubed

Reviewed-by: brutisso, tschatzl

Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso

Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso

Summary: Added -XX:+/-ClassUnloadingWithConcurrentMark
Reviewed-by: jmasa, brutisso, mgerdin

Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

Summary: Change parent of G1OffsetTableContigSpace to CompactibleSpace, reimplement missing functionality
Reviewed-by: stefank, jmasa, tschatzl

Reviewed-by: ehelin, mgerdin

Summary: Get rid of some duplicated implementations and change nonsense implementations to pure virtuals
Reviewed-by: stefank, jmasa

Summary: Only declare the functions where they are actually needed.
Reviewed-by: tschatzl, stefank

Reviewed-by: brutisso, tschatzl, stefank

Reviewed-by: tschatzl, stefank

Reviewed-by: tschatzl, coleenp

Reviewed-by: tschatzl, brutisso

Reviewed-by: tschatzl, mgerdin, jmasa

Reviewed-by: stefank, jmasa

Summary: Removed all write barriers during reference processing and added explicit write barriers when iterating through the discovered list.
Reviewed-by: pliden, jmasa, tschatzl

Summary: In case of allocation failure, restore the value of _chunk in Arena
Reviewed-by: dholmes, dcubed

Reviewed-by: twisti, stefank

8043029: Change 8037816 breaks HS build with older GCC versions which don't support diagnostic pragmas
8043164: Format warning in traceStream.hpp
Summary: Backport of main fix + two corrections, enables clang compilation, turns on format attributes, corrects/mutes warnings
Reviewed-by: kvn, coleenp, iveresov, twisti

Summary: Only prune metaspace virtual spaces at safepoint so walking them is safe outside a safepoint.
Reviewed-by: mgerdin, mgronlun, hseigel, stefank

Reviewed-by: dholmes, kvn, stefank, twisti

Reviewed-by: jwilhelm, ehelin, tschatzl

Summary: Making sure that if NewSize is set on the command line it should be used for both min and initial size even if it is re-aligned.
Reviewed-by: jwilhelm, jmasa

Summary: Now using NewRatio to size initial NewSize if not specified on commandline.
Reviewed-by: jmasa, jwilhelm

Summary: Preventing GCs to occur before VM is completely initialized. This was previously partly done by one part of the GC locker which not was removed.
Reviewed-by: coleenp, pliden

Reviewed-by: jmasa, coleenp

Reviewed-by: mgerdin, jmasa
Contributed-by: matthias.baesken@sap.com

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

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

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

Reviewed-by: stefank, mgerdin, coleenp, egahlin

Reviewed-by: stefank, mgerdin

Reviewed-by: jmasa, stefank

Reviewed-by: stefank, mgerdin

Reviewed-by: tschatzl, mgerdin
Contributed-by: goetz.lindenmaier@sap.com

Reviewed-by: tonyp, tschatzl

Reviewed-by: tschatzl, stefank, jmasa

Summary: Refactor the strong root processing to avoid using a boolean in addition to the ScanOption enum.
Reviewed-by: stefank, tschatzl, ehelin, jmasa