Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose.
Reviewed-by: jcoomes, mchung, stefank

Summary: It introduces ergonomic decision logging in G1 for the following heuristics: heap sizing, collection set construction, concurrent cycle initiation, and partially-young GC start/end. The code has a bit of refactoring in a few places to make the decision logging possible. It also replaces alternative ad-hoc logging that we have under different parameters and switches (G1_DEBUG, G1PolicyVerbose).
Reviewed-by: johnc, ysr

Summary: Remove the sentinelRef and let the last Reference in a discovered chain point back to itself.
Reviewed-by: ysr, jmasa

Summary: Remove the macro assembler routine br_on_reg_cond() and replace the remaining calls to that routine with an equivalent.
Reviewed-by: kvn, iveresov

Summary: Refactor code marking code in the evacuation pause copy closures so that an evacuated object is only marked by the thread that successfully copies it.
Reviewed-by: stefank, brutisso, tonyp

Summary: Support interleaving on NUMA systems for collectors that don't have NUMA-awareness.
Reviewed-by: iveresov, ysr
Contributed-by: NTom Deneau <tom.deneau@amd.com>

Summary: Call {pre,post}_full_gc_dump() before and after a STW full gc of G1CollectedHeap. Also adjusted the prefix message, including the addition of missing whitespace.
Reviewed-by: brutisso, tonyp

7081064: G1: remove develop params G1FixedSurvivorSpaceSize, G1FixedTenuringThreshold, and G1FixedEdenSize
Summary: Remove three develop parameters we don't use.
Reviewed-by: brutisso, jwilhelm

Summary: Removed the possibility to turn off generational mode for G1.
Reviewed-by: johnc, ysr, tonyp

Summary: Move code from finalize_offsets_and_shorten() to fill_buffer() to restore previous behavior.
Reviewed-by: never

Summary: on T4 2 BIS instructions should be issued to prefetch 64 bytes
Reviewed-by: iveresov, phh, twisti

Summary: save/restore label and block in scratch_emit_size()
Reviewed-by: never

Reviewed-by: kvn, never, bdelsart

Summary: Refactor the allocation code during GC to use the G1AllocRegion abstraction. Use separate subclasses of G1AllocRegion for survivor and old regions. Avoid BOT updates and dirty survivor cards incrementally for the former.
Reviewed-by: brutisso, johnc, ysr

Summary: Use new short branch instruction in C2 generated code.
Reviewed-by: never

Summary: Handlize MemoryUsage klass oop in createGCInfo routine
Reviewed-by: tonyp, fparain, ysr, jcoomes

Summary: Use cl->is_valid_counted_loop() check.
Reviewed-by: never

Summary: Buffer overflow in os::get_line_chars
Reviewed-by: coleenp, dholmes, dcubed
Contributed-by: aph@redhat.com

Summary: Align the reserved size of the heap and perm to the heap region size to get a preferred heap base that is aligned to the region size, and call the correct heap reservation constructor. Also add a check in the heap reservation code that the reserved space starts at the requested address (if any).
Reviewed-by: kvn, ysr

Summary: replace MemBarAcquire/MemBarRelease nodes on the monitor enter/exit code paths with new MemBarAcquireLock/MemBarReleaseLock nodes
Reviewed-by: kvn, twisti

Reviewed-by: gbenson, twisti
Contributed-by: NChris Phillips <chphilli@redhat.com>

Summary: Avoid overcounting when CMS has concurrent mode failure.
Reviewed-by: ysr
Contributed-by: rednaxelafx@gmail.com

Summary: In root processing, move the scanning of the reference processor's discovered lists to before RSet updating and scanning. When scanning the reference processor's discovered lists, use a buffering closure so that the time spent copying any reference object is correctly attributed. Also removed a couple of unused and irrelevant timers.
Reviewed-by: ysr, jmasa

Summary: Removed predicate cloning from loop peeling optimization and from split fall-in paths.
Reviewed-by: never

Reviewed-by: kvn, iveresov

Reviewed-by: jrose, twisti
Contributed-by: NXerxes Ranby <xerxes@zafena.se>

Summary: Remove flags which duplicate information in Node::NodeClasses.
Reviewed-by: never

Reviewed-by: kvn

Summary: Do not move data nodes which are attached to a predicate test to a dominating test.
Reviewed-by: never

Summary: Update the OOME stacktrace to contain Throwable.UNASSIGNED_STACK when the backtrace is filled in
Reviewed-by: mchung, phh

Summary: Add new short branch instruction to Hotspot sparc assembler.
Reviewed-by: never, twisti, jrose

Reviewed-by: kvn, twisti, jrose

Summary: Added feedback disabling flag to common(), fixed handling of TieredStopAtLevel.
Reviewed-by: kvn, never

Summary: Pass arguments to runtime via java array for arrays with > 5 dimensions
Reviewed-by: never, kvn, jrose, pbk

Summary: Use new VIS3 mov instructions on T4 for move data between general and float registers.
Reviewed-by: never, twisti

Reviewed-by: dholmes, never, jwilhelm, kvn

Summary: do explicit lookup emulating old LD_LIBRARY_PATH search
Reviewed-by: kvn, jrose

Reviewed-by: dholmes, never, jwilhelm, kvn

Reviewed-by: dholmes, never, jwilhelm, kvn

Reviewed-by: dholmes, never, jwilhelm, kvn