6994297: G1: do first-level slow-path allocations with a CAS Summary: First attempt to allocate out the current alloc region using a CAS instead of taking the Heap_lock (first level of G1's slow allocation path). Only if that fails and it's necessary to replace the current alloc region take the Heap_lock (that's the second level of G1's slow allocation path). Reviewed-by: johnc, brutisso, ysr

7007068: G1: refine the BOT during evac failure handling Summary: During evacuation failure handling we refine the BOT to reflect the location of all the objects in the regions we scan. The changeset includes some minor cleanup: a) non-product print_on() method on the G1 BOT class, b) added more complete BOT verification during heap / region verification, c) slight modification to the BOT set up for humongous regions to be more consistent with the BOT set up during evac failure handling, and d) removed a couple of unused methods. Reviewed-by: johnc, ysr

7008136: CMS: assert((HeapWord*)nextChunk <= _limit) failed: sweep invariant Summary: The recorded _sweep_limit may not necessarily remain a block boundary as the old generation expands during a concurrent cycle. Terminal actions inside the sweep closure need to be aware of this as they cross over the limit. Reviewed-by: johnc, minqi

Merge

7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined Summary: Change get_temp_directory() back to /tmp and %TEMP% like it always was and where the tools expect it to be. Reviewed-by: phh, dcubed, kamg, alanb

6994753: Implement optional hook to a Java method at VM startup. Reviewed-by: mchung, acorn

Merge

7011463: Sparc MacroAssembler::incr_allocated_bytes() needs a RegisterOrConstant argument Summary: Replaced incr_allocated_bytes() formals var_size_in_bytes and con_size_in_bytes with a single RegisterOrConstant formal. Reviewed-by: twisti, jcoomes

6814943: getcpool001 catches more than one JvmtiThreadState problem Summary: Mark field volatile, use membars, and change access order to close race Reviewed-by: dcubed, dholmes

6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent Summary: Make JvmtiGCMark safe to run non-safepoint and instrument CMS Reviewed-by: ysr, dcubed