Summary: SymbolTable and StringTable can make calls to GC_locker::is_active() outside a safepoint. This isn't safe because the GC_locker active state (lock count) is only updated at a safepoint and only remains valid as long as _needs_gc is true. However, outside a safepoint_needs_gc can change to false at any time, which makes it impossible to do a correct call to is_active() in that context. In this case these calls can just be removed since the input argument to basic_add() should never be on the heap and so there's no need to check the GC_locker state. This change also adjusts the assert() in is_active() to makes sure all calls to this function are always done under a safepoint.
Reviewed-by: brutisso, dcubed
Contributed-by: per.liden@oracle.com

Reviewed-by: stefank, dholmes, coleenp

8024396: VM crashing with assert(!UseLargePages || UseParallelOldGC || use_large_pages) failed: Wrong alignment to use large pages
Summary: Loosen wrong assert for UseParallelOldGC to UseParallelGC
Reviewed-by: stefank, brutisso

Reviewed-by: brutisso, mgerdin, coleenp

Reviewed-by: jmasa, brutisso

Reviewed-by: jwilhelm, brutisso, tschatzl

Reviewed-by: brutisso, mgerdin, coleenp, jmasa

Reviewed-by: brutisso, ehelin

Reviewed-by: stefank, hseigel, mgerdin

Summary: Use conservative assumptions of required alignment for the various garbage collector components into account when determining the maximum heap size that supports compressed oops. Using this conservative value avoids several circular dependencies in the calculation.
Reviewed-by: stefank, dholmes

Summary: Use best-fit block-splitting freelist allocation from the block freelist.
Reviewed-by: jmasa, stefank

8023381: VM fails to initialize in runtime/CDSCompressedKPtrs/XShareAuto.java runtime/SharedArchiveFile/CdsSameObjectAlignment.java
Summary: Improve handling when CDS archive cannot be mapped
Reviewed-by: kvn, dholmes, mseledtsov

Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification
Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung
Contributed-by: lois.foltan@oracle.com

Summary: Return NULL on OOM from GetStringChars, GetStringUTFChars and Get<PrimitiveType>ArrayElements family of functions.
Reviewed-by: dholmes, coleenp

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

8016729: ObjectAlignmentInBytes=16 now forces the use of heap based compressed oops
8005933: The -Xshare:auto option is ignored for -server
Summary: Move klass metaspace above the heap and support CDS with compressed klass ptrs.
Reviewed-by: coleenp, kvn, mgerdin, tschatzl, stefank

Reviewed-by: stefank, ehelin

Summary: Add a list of nmethods to the RSet for a region that contain references into the region. Skip scanning the code cache during root scanning and scan the nmethod lists during RSet scanning instead.
Reviewed-by: tschatzl, brutisso, mgerdin, twisti, kvn

Reviewed-by: jmasa, ehelin

Summary: ActiveMethodOopsCache was used to keep track of old versions of some methods that are cached in Universe but is buggy with permgen removal and not needed anymore
Reviewed-by: sspitsyn, dcubed, mseledtsov

Reviewed-by: coleenp, mgerdin, hseigel

Reviewed-by: mgerdin, coleenp, hseigel, jmasa, ctornqvi

Reviewed-by: acorn, jmasa, coleenp, dcubed, mgerdin

Reviewed-by: rasbold, tschatzl, jmasa
Contributed-by: yamauchi@google.com

6990419: CMS Remaining work for 6572569: consistently skewed work distribution in (long) re-mark pauses
Reviewed-by: rasbold, tschatzl, jmasa
Contributed-by: yamauchi@google.com

Summary: Changed initial size to Chunk::tiny_size (216 bytes)
Reviewed-by: coleenp, dholmes, sspitsyn

Summary: Remove -Xaprof and Klass::_alloc_count & ArrayKlass::_alloc_size.
Reviewed-by: stefank, coleenp

8015391: NPG: With -XX:+UseCompressedKlassPointers OOME due to exhausted metadata space could occur when metaspace is almost empty
Summary: Allocate medium chunks for class metaspace when class loader has lots of classes
Reviewed-by: mgerdin, jmasa

Reviewed-by: tbell, darcy

Reviewed-by: jmasa, mgerdin

Reviewed-by: johnc, tschatzl

Summary: Minimize redundant verifications of Klasses.
Reviewed-by: hseigel, jmasa

Reviewed-by: tschatzl, dholmes, coleenp, johnc

Summary: Parallelize the scanning of the intern string table by having each GC worker claim a given number of buckets. Changes were also reviewed by Per Liden <per.liden@oracle.com>.
Reviewed-by: tschatzl, stefank, twisti

Reviewed-by: kvn, dcubed

Reviewed-by: dholmes, sla

Summary: Fixed MetaspaceShared::is_in_shared_space
Reviewed-by: coleenp, hseigel

Reviewed-by: sla, rbackman

Reviewed-by: dholmes, coleenp
Contributed-by: jeremymanson@google.com, calvin.cheung@oracle.com

8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
Summary: Detect mmap() commit failures in Linux and Solaris os::commit_memory() impls and call vm_exit_out_of_memory(). Add os::commit_memory_or_exit(). Also tidy up some NMT accounting and some mmap() return value checking.
Reviewed-by: zgu, stefank, dholmes, dsamersoff