Summary: Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.
Reviewed-by: johnc

Reviewed-by: ysr

6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field.
Reviewed-by: jmasa, johnc, poonam

6942771: SEGV in ParScanThreadState::take_from_overflow_stack
Reviewed-by: apetrusenko, ysr, pbk

Summary: Re-enable use of the lock-free versions of region stack push() and pop() by recording aborted regions in a thread-local structure, which are then processed when scanning of the region stack restarts. The previous locking versions of these routines are retained for diagnostic purposes.
Reviewed-by: tonyp, ysr

Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr

Summary: Pass correct value for length to NumberSeq constructor. Guard dereferences of "body_summary" pointer with a NULL check.
Reviewed-by: tonyp, ysr

Summary: Emit a fake frame that makes it look like the thread is in the OutOfMemoryError zero-parameter constructor
Reviewed-by: dcubed

Summary: Fixed comment/documentation typos; converted some guarantee()s to assert()s.
Reviewed-by: jmasa

Summary: Must check locals for null when processing chop frame
Reviewed-by: dholmes, dcubed

Summary: Implementation of a nonproduct boolean flag XX:PrintFlagsWithComments
Reviewed-by: kamg, dholmes, dsamersoff

Reviewed-by: kvn

Summary: Fix code in TypeAryPtr::xmeet() for constant array.
Reviewed-by: never

Reviewed-by: kvn

Summary: Use resource memory instead of c-heap for the exception message
Reviewed-by: phh, jmasa

Summary: An assert in the management.cpp is too strong and assumes the max size is always defined on memory pools, even when we don't need to use it.
Reviewed-by: mchung, johnc

Summary: This is a preparation for 6961690.
Reviewed-by: kvn, never

Summary: Use NULL as klass for TypeAryPtr::RANGE. Add klass verification into TypeAryPtr ctor.
Reviewed-by: never

Reviewed-by: tonyp, ysr

Summary: The way we were caluclating the max value meant that it might fluctuate during the run and this broke some assumptions inside the MBeans framework. This change sets the max value of each pool to -1, which means undefined according to the spec.
Reviewed-by: mchung, johnc

Summary: This is the renaming part of 6961697 to keep the actual changes small for review.
Reviewed-by: kvn, never

Summary: Weakened a too-strong, off-by-one assert; added code to keep track of and report any overflows at appropriate level of verbosity.
Reviewed-by: jcoomes, tonyp

6896381: CTW fails share/vm/ci/bcEscapeAnalyzer.cpp:99, assert(_stack_height < _max_stack,"stack overflow")
Summary: Check constant Tag type instead of calling get_constant().
Reviewed-by: never

Reviewed-by: kvn

Reviewed-by: kvn

Reviewed-by: jcoomes, jmasa, tonyp

6885308: The incorrect -XX:StackRedPages, -XX:StackShadowPages, -XX:StackYellowPages could cause VM crash
Summary: Test minimal stack sizes given (also fixed linux compilation error)
Reviewed-by: never, phh, coleenp

Summary: Allow for the possibility (when the heap is expanding) that the sweep might skip over and past, rather than necessarily step on, the sweep limit determined at the beginning of a concurrent marking cycle.
Reviewed-by: jmasa, tonyp

Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh

Summary: A number of fixes for Zero and Shark.
Reviewed-by: twisti
Contributed-by: NGary Benson <gbenson@redhat.com>

6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
Summary: we're renaming "evacuation failure" to "to-space overflow". I'm also piggy-backing a small additional change which removes the "Mark closure took..." output.
Reviewed-by: ysr, johnc

Summary: as the title says, sometimes we are allocating humongous objects in young regions and we shouldn't.
Reviewed-by: ysr, johnc

Summary: There are a few issues in the code that calculates whether to resize the heap and by how much: a) some calculations can overflow 32-bit size_t's, b) min_desired_capacity is not bounded by the max heap size, and c) the assrt that fires is in the wrong place. The fix also includes some tidying up of the related verbose code.
Reviewed-by: ysr, jmasa

Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode.
Reviewed-by: chrisphi, johnc, poonam

Reviewed-by: kvn, twisti

Reviewed-by: kvn, twisti

Reviewed-by: kvn, twisti

Reviewed-by: tonyp

Summary: Recompile without subsuming loads if RA try to clone a node with anti_dependence.
Reviewed-by: never

Summary: Shark is a JIT compiler for Zero that uses the LLVM compiler infrastructure.
Reviewed-by: kvn, twisti
Contributed-by: NGary Benson <gbenson@redhat.com>