Merge

Merge

8022872: G1: Use correct GC cause for young GC triggered by humongous allocations Reviewed-by: tonyp, tschatzl

8022817: CMS should not shrink if compaction was not done Reviewed-by: ysr, mgerdin

Merge

8007074: SIGSEGV at ParMarkBitMap::verify_clear() Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages. Reviewed-by: tschatzl, dcubed, brutisso

8022683: JNI GetStringUTFChars should return NULL on allocation failure not abort the VM Summary: Return NULL on OOM from GetStringChars, GetStringUTFChars and Get<PrimitiveType>ArrayElements family of functions. Reviewed-by: dholmes, coleenp

8022183: GCC 4.6 change sdefault setting for omit-frame-pointer which breaks hotspot stack walking Summary: Explicitly specify -fno-omit-frame-pointer. Reviewed-by: coleenp, dholmes, dcubed

Merge

8023457: Event based tracing framework needs a mutex for thread groups Reviewed-by: acorn, sla