Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp

Summary: Changing the behavior of -XX:+PrintHeapAtGC for G1 from printing lengthy, per-region information to instead printing a concise summary.
Reviewed-by: ysr, apetrusenko, jcoomes

Summary: Missed updating two variable names when improving the code for 6850869.
Reviewed-by: iveresov, jmasa, ysr

Summary: RSet scrubbing incorrectly deletes RSet entries that point to regions tagged as "continues humongous" due to a race when RSet scrubbing iterates over regions in parallel.
Reviewed-by: apetrusenko, iveresov

Summary: extend G1 marking verification to use either the "prev" or "next" marking information, as appropriate.
Reviewed-by: johnc, ysr

Summary: Typo fix
Reviewed-by: jcoomes

Reviewed-by: tonyp, iveresov, jmasa, ysr

Summary: For heaps larger than 32Gb, the number of heap regions overflows the data type used to hold the region index in the SparsePRT structure. Changed the region indexes, card indexes, and RSet hash table buckets to ints and added some size overflow guarantees.
Reviewed-by: ysr, tonyp

Summary: The field is now initialized in the constructor.
Reviewed-by: iveresov, jmasa, johnc

Reviewed-by: iveresov, tonyp

Summary: During parallel rset updating we have to make sure that the worker ids of the refinement threads do not intersect with the worker ids that can be claimed by the mutator threads.
Reviewed-by: tonyp

6826318: G1: remove traversal-based refinement code
Summary: Removed traversal-based refinement code as it's no longer used. Made the concurrent refinement (queue-based) parallel.
Reviewed-by: tonyp

Summary: The code that calculates the heap region index for an object address incorrectly used signed arithmetic.
Reviewed-by: jcoomes, ysr

Summary: Change G1 flag names to be more consistent and disable some in 'product' mode.
Reviewed-by: tonyp, iveresov

Summary: Added a feedback-driven exponential skipping for parallel RSet scanning.
Reviewed-by: tonyp, apetrusenko

Summary: Turn off G1VerifyConcMarkPrintReachable by default to minimize the amount of verbose output we generate by default.
Reviewed-by: jmasa

Summary: When using compressed oops, rather than chaining the overflowed grey objects' pre-images through their klass words, we use GC-worker thread-local overflow stacks.
Reviewed-by: jcoomes, jmasa

Summary: Make object_iterate() traverse the perm gen
Reviewed-by: apetrusenko, tonyp

Reviewed-by: iveresov, tonyp

Summary: Small fixes to sort out some verbosegc-related incorrectness and a failure
Reviewed-by: apetrusenko

Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never

Summary: We should mark the regions that continue humongous regions as live if the first region is live.
Reviewed-by: tonyp

Summary: Allow Hotspot builds with latest Windows SDK 6.1 on 64bit Windows 2003
Reviewed-by: ohair, tbell, jcoomes

Summary: Introduces two flags, -XX:-/+G1EnableParallelRSetUpdating and -XX:-/+G1EnableParallelRSetScanning, to turn on/off the "band aid" fix that serializes RSet updating / scanning during GCs.
Reviewed-by: iveresov

Summary: Enabled full verification for humongous regions. Also made sure that the VerifyAfterGC works with deferred updates and G1HRRSFlushLogBuffersOnVerify.
Reviewed-by: tonyp

6728271: G1: Cleanup G1CollectedHeap::get_gc_alloc_regions()
Summary: It allows the last half-full region to be allocated to during a GC to be reused during the next GC.
Reviewed-by: apetrusenko, jcoomes

Summary: Correct the overflow check in ParGCAllocBuffer::allocate(); simplify ParGCAllocBuffer::undo_allocation().
Reviewed-by: apetrusenko, jcoomes, jmasa, minqi, phh, tonyp

Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp

Reviewed-by: iveresov, tonyp

Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair

Summary: A few small fixes to remove some inconsistencies in the concurrent mark-related verbose GC output.
Reviewed-by: jmasa

Summary: The length of the fast cset test vector is decided at the beginning of a GC, but more regions can be added during the GC. The simple fix is to set the length of the fast cset test vector to the max.
Reviewed-by: iveresov

Summary: The _expanded flag of the sparse RSets is not reset and this can leave a RSet in an inconsistent state if it is expanded more than once. Also, we should be iterating over the _cur, instead of the _next, sparse table
Reviewed-by: apetrusenko, iveresov

6720334: G1: don't update RSets of collection set regions during an evacuation pause
Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause
Reviewed-by: apetrusenko, tonyp

Reviewed-by: tonyp

Summary: Allocate worker-local overflow stacks, introduced in 6819891, along with ParNewGeneration, rather than with the per-scavenge ParScanThreadState.
Reviewed-by: jmasa

Summary: Call newly created CollectedHeap::dump_{pre,post}_full_gc before and after every stop-world full collection cycle on GenCollectedHeap and ParallelScavengeHeap. (Support for G1CollectedHeap forthcoming under CR 6810861.) Small modifications to existing heap dumping and class histogram implementation, especially to allow multiple on-the-fly histos/dumps by the VM thread during a single safepoint.
Reviewed-by: jmasa, alanb, mchung

Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

Summary: Under certain circumstances (evacuation failure) the pause time is not communicated to the policy and, as a result, the pause time field is not initialized properly.
Reviewed-by: jmasa

Reviewed-by: tonyp