Summary: Closed a timing hole during which concurrent full gc requests can be missed. The hole can increase the latency of the response to a full gc request by up to the value of CMSWaitDuration. If CMSWaitDuration=0 is, as currently, interpreted as an unbounded wait, suitable in certain tuning scenarios, the application can potentially hang. Made two obscure tunables, including CMSWaitDuration, manageable.
Reviewed-by: jcoomes, tonyp

Summary: There is a race between the concurrent refinement threads and the humongous object allocation that can cause the concurrent refinement threads to corrupt the part of the BOT that it is being initialized by the humongous object allocation operation. The solution is to do the humongous object allocation in careful steps to ensure that the concurrent refinement threads always have a consistent view over the BOT, region contents, and top. The fix includes some very minor tidying up in sparsePRT.
Reviewed-by: jcoomes, johnc, ysr

6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
Summary: The changes from 6941395 did not clear the CMTask::_aborted_region fields when concurrent marking aborted because of overflow. As a result, the next time around we could see a memory region whose start address was above the global finger and the assertion tripped. Moved the clearing of the aborted regions to ConcurrentMark::clear_marking_state, which is executed on all of the exit paths.
Reviewed-by: tonyp, ysr, jmasa

Summary: The remembered set iterator for sparse tables incorrectly assumes that index 0 corresponds to the bottom of the heap, not address 0 as it is the case.
Reviewed-by: ysr, jmasa

Summary: When an entry is stolen, don't push it on the task queue but process it directly.
Reviewed-by: iveresov, ysr, jcoomes

Reviewed-by: iveresov, tonyp

Summary: Remove G1RemSet base class and StupidG1RemSet class; rename HRInto_G1RemSet to just G1RemSet.
Reviewed-by: ysr, tonyp

Summary: Set upper limit 256 for ObjectAlignmentInBytes value.
Reviewed-by: never, iveresov

Summary: Fix ciMethod::instructions_size() to return correct value
Reviewed-by: kvn, twisti

Summary: Under certain circumstances a safepoint could happen between a JavaThread object being created and that object being added to the Java threads list. This could cause the active field of that thread's SATB queue to get out-of-sync with respect to the other Java threads. The solution is to activate the SATB queue, when necessary, before adding the thread to the Java threads list, not when the JavaThread object is created. The changeset also includes a small fix to rename the surrogate locker thread from "Surrogate Locker Thread (CMS)" to "Surrogate Locker Thread (Concurrent GC)" since it's also used in G1.
Reviewed-by: iveresov, ysr, johnc, jcoomes

Summary: Clear the concurrent marking "in progress" flag while the FullGCCount_lock is held. This avoids a race that can cause back to back System.gc() calls, when ExplicitGCInvokesConcurrent is enabled, to fail to initiate a marking cycle causing the requesting thread to hang.
Reviewed-by: tonyp, ysr

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

Summary: Missing check for not empty worklist when puting memory node back on worklist and expecting address type update.
Reviewed-by: never

Reviewed-by: ysr

Summary: adjusted profiling code generation to use the new ValueStack implementation; lowered optimization level for c1_LinearScan.cpp on solaris x64.
Reviewed-by: kvn, never

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

Summary: fixes build break
Reviewed-by: never, kvn

6987634: JSR 292 assert(start_bci() >= 0 && start_bci() < code_size()) failed: correct osr_bci argument
Reviewed-by: never, kvn

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

Reviewed-by: roland, kvn, iveresov

Summary: Fixed NonTieredCompPolicy::compiler_count() to return correct thread count.
Reviewed-by: twisti, kvn

6986944: JSR 292 assert(caller_nm->is_method_handle_return(caller_frame.pc())) failed: must be MH call site
Reviewed-by: never, kvn

Reviewed-by: kvn, twisti

Reviewed-by: kvn

Reviewed-by: kvn

6986270: guarantee(*bcp != Bytecodes::_monitorenter || exec_mode != Deoptimization::Unpack_exception) fails
Summary: Propagate the compiler type of the deopting method to vframeArrayElement::unpack_on_stack()
Reviewed-by: jrose, never

Summary: Naked oop in verificationType::is_reference_assignable_from()
Reviewed-by: never, kvn, coleenp

Summary: Uses JDK_Version to determinate to set vm vendor to "Oracle Corporation" for JDK7 and later.
Reviewed-by: kamg, ohair, coleenp

Reviewed-by: kvn

Summary: take into account HeapBaseMinAddress and round down MaxPermSize
Reviewed-by: never

Reviewed-by: never

Summary: Remove code which use UseNewCode in type.hpp
Reviewed-by: never

Summary: Added profiling of instanceof and aastore.
Reviewed-by: kvn, jrose, never

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

6934483: GCC 4.5 errors "suggest parentheses around something..." when compiling with -Werror and -Wall
Summary: These are minor changes fixing compile failure when -Wall -Werror flags are used under gcc 4.5.
Reviewed-by: twisti, kvn, rasbold
Contributed-by: NPavel Tisnovsky <ptisnovs@redhat.com>

Reviewed-by: kvn

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