6765954: par compact - stress mode for splitting young gen spaces Reviewed-by: jmasa

6765745: par compact - allow young gen spaces to be split Reviewed-by: jmasa

6578152: fill_region_with_object has usability and safety issues Reviewed-by: apetrusenko, ysr

6782457: CMS: Livelock in CompactibleFreeListSpace::block_size() 6736295: SIGSEGV in product jvm, assertion "these are the only valid states during a mark sweep" in fastdebug Summary: Restructured the code in the perm gen allocation retry loop so as to avoid "safepoint-blocking" on locks, in this case the Heap_lock, while holding uninitialized allocated heap storage. Reviewed-by: apetrusenko, iveresov, jcoomes, jmasa, poonam

Merge

6639341: sometimes contended-exit event comes after contended-entered on another thread Summary: DTrace probe "contended-exit" should be fired before unparking object, or context could be lost. Probe firing was moved to proper place. Reviewed-by: coleenp, kamg

6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE Summary: Make reguard_stack change access to RW, not execute and use os::protect_memory with the new parameter when change needed to X. Reviewed-by: acorn, jcoomes

Merge

6771309: debugging AD files is difficult without #line directives in generated code Summary: more and better #line and #define directives in the generated code; ADLC itself accepts #line directives Reviewed-by: never, kvn

6779339: turn off LinkWellKnownClasses by default pending further testing Summary: temporarily turn off LinkWellKnownClasses optimization Reviewed-by: never, kvn