# HG changeset patch
# User brutisso
# Date 1413444994 -7200
#      Thu Oct 16 09:36:34 2014 +0200
# Node ID 0f808003ec5dcefdc2325d31290aee80660cca2c
# Parent  1698cbc9fa21d51bd7f139fed20bc5b1bfbb75c9
[mq]: inccms

diff --git a/agent/src/share/classes/sun/jvm/hotspot/memory/DefNewGeneration.java b/agent/src/share/classes/sun/jvm/hotspot/memory/DefNewGeneration.java
--- a/agent/src/share/classes/sun/jvm/hotspot/memory/DefNewGeneration.java
+++ b/agent/src/share/classes/sun/jvm/hotspot/memory/DefNewGeneration.java
@@ -64,8 +64,8 @@
   }
 
   // Accessing spaces
-  public EdenSpace eden() {
-    return (EdenSpace) VMObjectFactory.newObject(EdenSpace.class, edenSpaceField.getValue(addr));
+  public ContiguousSpace eden() {
+    return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, edenSpaceField.getValue(addr));
   }
 
   public ContiguousSpace from() {
diff --git a/agent/src/share/classes/sun/jvm/hotspot/memory/EdenSpace.java b/agent/src/share/classes/sun/jvm/hotspot/memory/EdenSpace.java
deleted file mode 100644
--- a/agent/src/share/classes/sun/jvm/hotspot/memory/EdenSpace.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-package sun.jvm.hotspot.memory;
-
-import java.util.*;
-import sun.jvm.hotspot.debugger.*;
-import sun.jvm.hotspot.runtime.*;
-import sun.jvm.hotspot.types.*;
-
-/** <P> Class EdenSpace describes eden-space in new
-    generation. (Currently it does not add any significant
-    functionality beyond ContiguousSpace.) */
-
-public class EdenSpace extends ContiguousSpace {
-  public EdenSpace(Address addr) {
-    super(addr);
-  }
-}
diff --git a/src/cpu/ppc/vm/templateTable_ppc_64.cpp b/src/cpu/ppc/vm/templateTable_ppc_64.cpp
--- a/src/cpu/ppc/vm/templateTable_ppc_64.cpp
+++ b/src/cpu/ppc/vm/templateTable_ppc_64.cpp
@@ -3513,7 +3513,7 @@
                  Rtags            = R3_ARG1,
                  Rindex           = R5_ARG3;
 
-  const bool allow_shared_alloc = Universe::heap()->supports_inline_contig_alloc() && !CMSIncrementalMode;
+  const bool allow_shared_alloc = Universe::heap()->supports_inline_contig_alloc();
 
   // --------------------------------------------------------------------------
   // Check if fast case is possible.
diff --git a/src/cpu/sparc/vm/macroAssembler_sparc.cpp b/src/cpu/sparc/vm/macroAssembler_sparc.cpp
--- a/src/cpu/sparc/vm/macroAssembler_sparc.cpp
+++ b/src/cpu/sparc/vm/macroAssembler_sparc.cpp
@@ -3196,7 +3196,7 @@
   assert(0 <= con_size_in_bytes && Assembler::is_simm13(con_size_in_bytes), "illegal object size");
   assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
 
-  if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
+  if (!Universe::heap()->supports_inline_contig_alloc()) {
     // No allocation in the shared eden.
     ba(slow_case);
     delayed()->nop();
@@ -3331,7 +3331,7 @@
   assert_different_registers(top, t1, t2, t3, G4, G5 /* preserve G4 and G5 */);
   Label do_refill, discard_tlab;
 
-  if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
+  if (!Universe::heap()->supports_inline_contig_alloc()) {
     // No allocation in the shared eden.
     ba(slow_case);
     delayed()->nop();
diff --git a/src/cpu/sparc/vm/templateTable_sparc.cpp b/src/cpu/sparc/vm/templateTable_sparc.cpp
--- a/src/cpu/sparc/vm/templateTable_sparc.cpp
+++ b/src/cpu/sparc/vm/templateTable_sparc.cpp
@@ -3309,7 +3309,7 @@
   // (creates a new TLAB, etc.)
 
   const bool allow_shared_alloc =
-    Universe::heap()->supports_inline_contig_alloc() && !CMSIncrementalMode;
+    Universe::heap()->supports_inline_contig_alloc();
 
   if(UseTLAB) {
     Register RoldTopValue = RallocatedObject;
diff --git a/src/cpu/x86/vm/macroAssembler_x86.cpp b/src/cpu/x86/vm/macroAssembler_x86.cpp
--- a/src/cpu/x86/vm/macroAssembler_x86.cpp
+++ b/src/cpu/x86/vm/macroAssembler_x86.cpp
@@ -2964,7 +2964,7 @@
                                    Label& slow_case) {
   assert(obj == rax, "obj must be in rax, for cmpxchg");
   assert_different_registers(obj, var_size_in_bytes, t1);
-  if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
+  if (!Universe::heap()->supports_inline_contig_alloc()) {
     jmp(slow_case);
   } else {
     Register end = t1;
@@ -4437,7 +4437,7 @@
   assert_different_registers(top, thread_reg, t1, t2, /* preserve: */ rbx, rdx);
   Label do_refill, discard_tlab;
 
-  if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
+  if (!Universe::heap()->supports_inline_contig_alloc()) {
     // No allocation in the shared eden.
     jmp(slow_case);
   }
diff --git a/src/cpu/x86/vm/templateTable_x86_32.cpp b/src/cpu/x86/vm/templateTable_x86_32.cpp
--- a/src/cpu/x86/vm/templateTable_x86_32.cpp
+++ b/src/cpu/x86/vm/templateTable_x86_32.cpp
@@ -3214,7 +3214,7 @@
   // (creates a new TLAB, etc.)
 
   const bool allow_shared_alloc =
-    Universe::heap()->supports_inline_contig_alloc() && !CMSIncrementalMode;
+    Universe::heap()->supports_inline_contig_alloc();
 
   const Register thread = rcx;
   if (UseTLAB || allow_shared_alloc) {
diff --git a/src/cpu/x86/vm/templateTable_x86_64.cpp b/src/cpu/x86/vm/templateTable_x86_64.cpp
--- a/src/cpu/x86/vm/templateTable_x86_64.cpp
+++ b/src/cpu/x86/vm/templateTable_x86_64.cpp
@@ -3269,7 +3269,7 @@
   // (creates a new TLAB, etc.)
 
   const bool allow_shared_alloc =
-    Universe::heap()->supports_inline_contig_alloc() && !CMSIncrementalMode;
+    Universe::heap()->supports_inline_contig_alloc();
 
   if (UseTLAB) {
     __ movptr(rax, Address(r15_thread, in_bytes(JavaThread::tlab_top_offset())));
diff --git a/src/share/vm/Xusage.txt b/src/share/vm/Xusage.txt
--- a/src/share/vm/Xusage.txt
+++ b/src/share/vm/Xusage.txt
@@ -7,7 +7,6 @@
     -Xbootclasspath/p:<directories and zip/jar files separated by ;>
                       prepend in front of bootstrap class path
     -Xnoclassgc       disable class garbage collection
-    -Xincgc           enable incremental garbage collection
     -Xloggc:<file>    log GC status to a file with time stamps
     -Xbatch           disable background compilation
     -Xms<size>        set initial Java heap size
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.cpp b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.cpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.cpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.cpp
@@ -89,9 +89,3 @@
     _gc_policy_counters = new GCPolicyCounters("Copy:CMS", 2, 3);
   }
 }
-
-// Returns true if the incremental mode is enabled.
-bool ConcurrentMarkSweepPolicy::has_soft_ended_eden()
-{
-  return CMSIncrementalMode;
-}
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp
@@ -42,9 +42,6 @@
   virtual void initialize_size_policy(size_t init_eden_size,
                                       size_t init_promo_size,
                                       size_t init_survivor_size);
-
-  // Returns true if the incremental mode is enabled.
-  virtual bool has_soft_ended_eden();
 };
 
 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSCOLLECTORPOLICY_HPP
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
@@ -167,16 +167,6 @@
 };
 
 
-// Wrapper class to temporarily disable icms during a foreground cms collection.
-class ICMSDisabler: public StackObj {
- public:
-  // The ctor disables icms and wakes up the thread so it notices the change;
-  // the dtor re-enables icms.  Note that the CMSCollector methods will check
-  // CMSIncrementalMode.
-  ICMSDisabler()  { CMSCollector::disable_icms(); CMSCollector::start_icms(); }
-  ~ICMSDisabler() { CMSCollector::enable_icms(); }
-};
-
 //////////////////////////////////////////////////////////////////
 //  Concurrent Mark-Sweep Generation /////////////////////////////
 //////////////////////////////////////////////////////////////////
@@ -363,7 +353,6 @@
   _cms_used_at_gc0_end = 0;
   _allow_duty_cycle_reduction = false;
   _valid_bits = 0;
-  _icms_duty_cycle = CMSIncrementalDutyCycle;
 }
 
 double CMSStats::cms_free_adjustment_factor(size_t free) const {
@@ -442,71 +431,6 @@
   return work - deadline;
 }
 
-// Return a duty cycle based on old_duty_cycle and new_duty_cycle, limiting the
-// amount of change to prevent wild oscillation.
-unsigned int CMSStats::icms_damped_duty_cycle(unsigned int old_duty_cycle,
-                                              unsigned int new_duty_cycle) {
-  assert(old_duty_cycle <= 100, "bad input value");
-  assert(new_duty_cycle <= 100, "bad input value");
-
-  // Note:  use subtraction with caution since it may underflow (values are
-  // unsigned).  Addition is safe since we're in the range 0-100.
-  unsigned int damped_duty_cycle = new_duty_cycle;
-  if (new_duty_cycle < old_duty_cycle) {
-    const unsigned int largest_delta = MAX2(old_duty_cycle / 4, 5U);
-    if (new_duty_cycle + largest_delta < old_duty_cycle) {
-      damped_duty_cycle = old_duty_cycle - largest_delta;
-    }
-  } else if (new_duty_cycle > old_duty_cycle) {
-    const unsigned int largest_delta = MAX2(old_duty_cycle / 4, 15U);
-    if (new_duty_cycle > old_duty_cycle + largest_delta) {
-      damped_duty_cycle = MIN2(old_duty_cycle + largest_delta, 100U);
-    }
-  }
-  assert(damped_duty_cycle <= 100, "invalid duty cycle computed");
-
-  if (CMSTraceIncrementalPacing) {
-    gclog_or_tty->print(" [icms_damped_duty_cycle(%d,%d) = %d] ",
-                           old_duty_cycle, new_duty_cycle, damped_duty_cycle);
-  }
-  return damped_duty_cycle;
-}
-
-unsigned int CMSStats::icms_update_duty_cycle_impl() {
-  assert(CMSIncrementalPacing && valid(),
-         "should be handled in icms_update_duty_cycle()");
-
-  double cms_time_so_far = cms_timer().seconds();
-  double scaled_duration = cms_duration_per_mb() * _cms_used_at_gc0_end / M;
-  double scaled_duration_remaining = fabsd(scaled_duration - cms_time_so_far);
-
-  // Avoid division by 0.
-  double time_until_full = MAX2(time_until_cms_gen_full(), 0.01);
-  double duty_cycle_dbl = 100.0 * scaled_duration_remaining / time_until_full;
-
-  unsigned int new_duty_cycle = MIN2((unsigned int)duty_cycle_dbl, 100U);
-  if (new_duty_cycle > _icms_duty_cycle) {
-    // Avoid very small duty cycles (1 or 2); 0 is allowed.
-    if (new_duty_cycle > 2) {
-      _icms_duty_cycle = icms_damped_duty_cycle(_icms_duty_cycle,
-                                                new_duty_cycle);
-    }
-  } else if (_allow_duty_cycle_reduction) {
-    // The duty cycle is reduced only once per cms cycle (see record_cms_end()).
-    new_duty_cycle = icms_damped_duty_cycle(_icms_duty_cycle, new_duty_cycle);
-    // Respect the minimum duty cycle.
-    unsigned int min_duty_cycle = (unsigned int)CMSIncrementalDutyCycleMin;
-    _icms_duty_cycle = MAX2(new_duty_cycle, min_duty_cycle);
-  }
-
-  if (PrintGCDetails || CMSTraceIncrementalPacing) {
-    gclog_or_tty->print(" icms_dc=%d ", _icms_duty_cycle);
-  }
-
-  _allow_duty_cycle_reduction = false;
-  return _icms_duty_cycle;
-}
-
 #ifndef PRODUCT
 void CMSStats::print_on(outputStream *st) const {
   st->print(" gc0_alpha=%d,cms_alpha=%d", _gc0_alpha, _cms_alpha);
@@ -519,9 +443,6 @@
             cms_time_since_begin(), cms_time_since_end());
   st->print(",cms_used_beg=" SIZE_FORMAT ",cms_used_end=" SIZE_FORMAT,
             _cms_used_at_gc0_begin, _cms_used_at_gc0_end);
-  if (CMSIncrementalMode) {
-    st->print(",dc=%d", icms_duty_cycle());
-  }
 
   if (valid()) {
     st->print(",promo_rate=%g,cms_alloc_rate=%g",
@@ -579,8 +500,6 @@
 #endif
   _collection_count_start(0),
   _verifying(false),
-  _icms_start_limit(NULL),
-  _icms_stop_limit(NULL),
   _verification_mark_bm(0, Mutex::leaf + 1, "CMS_verification_mark_bm_lock"),
   _completed_initialization(false),
   _collector_policy(cp),
@@ -1124,131 +1043,6 @@
   return (size_t)(delta * 100.0 / (space->capacity() / HeapWordSize));
 }
 
-void CMSCollector::icms_update_allocation_limits()
-{
-  Generation* young = GenCollectedHeap::heap()->get_gen(0);
-  EdenSpace* eden = young->as_DefNewGeneration()->eden();
-
-  const unsigned int duty_cycle = stats().icms_update_duty_cycle();
-  if (CMSTraceIncrementalPacing) {
-    stats().print();
-  }
-
-  assert(duty_cycle <= 100, "invalid duty cycle");
-  if (duty_cycle != 0) {
-    // The duty_cycle is a percentage between 0 and 100; convert to words and
-    // then compute the offset from the endpoints of the space.
-    size_t free_words = eden->free() / HeapWordSize;
-    double free_words_dbl = (double)free_words;
-    size_t duty_cycle_words = (size_t)(free_words_dbl * duty_cycle / 100.0);
-    size_t offset_words = (free_words - duty_cycle_words) / 2;
-
-    _icms_start_limit = eden->top() + offset_words;
-    _icms_stop_limit = eden->end() - offset_words;
-
-    // The limits may be adjusted (shifted to the right) by
-    // CMSIncrementalOffset, to allow the application more mutator time after a
-    // young gen gc (when all mutators were stopped) and before CMS starts and
-    // takes away one or more cpus.
-    if (CMSIncrementalOffset != 0) {
-      double adjustment_dbl = free_words_dbl * CMSIncrementalOffset / 100.0;
-      size_t adjustment = (size_t)adjustment_dbl;
-      HeapWord* tmp_stop = _icms_stop_limit + adjustment;
-      if (tmp_stop > _icms_stop_limit && tmp_stop < eden->end()) {
-        _icms_start_limit += adjustment;
-        _icms_stop_limit = tmp_stop;
-      }
-    }
-  }
-  if (duty_cycle == 0 || (_icms_start_limit == _icms_stop_limit)) {
-    _icms_start_limit = _icms_stop_limit = eden->end();
-  }
-
-  // Install the new start limit.
-  eden->set_soft_end(_icms_start_limit);
-
-  if (CMSTraceIncrementalMode) {
-    gclog_or_tty->print(" icms alloc limits:  "
-                           PTR_FORMAT "," PTR_FORMAT
-                           " (" SIZE_FORMAT "%%," SIZE_FORMAT "%%) ",
-                           p2i(_icms_start_limit), p2i(_icms_stop_limit),
-                           percent_of_space(eden, _icms_start_limit),
-                           percent_of_space(eden, _icms_stop_limit));
-    if (Verbose) {
-      gclog_or_tty->print("eden:  ");
-      eden->print_on(gclog_or_tty);
-    }
-  }
-}
-
-// Any changes here should try to maintain the invariant
-// that if this method is called with _icms_start_limit
-// and _icms_stop_limit both NULL, then it should return NULL
-// and not notify the icms thread.
-HeapWord*
-CMSCollector::allocation_limit_reached(Space* space, HeapWord* top,
-                                       size_t word_size)
-{
-  // A start_limit equal to end() means the duty cycle is 0, so treat that as a
-  // nop.
-  if (CMSIncrementalMode && _icms_start_limit != space->end()) {
-    if (top <= _icms_start_limit) {
-      if (CMSTraceIncrementalMode) {
-        space->print_on(gclog_or_tty);
-        gclog_or_tty->stamp();
-        gclog_or_tty->print_cr(" start limit top=" PTR_FORMAT
-                               ", new limit=" PTR_FORMAT
-                               " (" SIZE_FORMAT "%%)",
-                               p2i(top), p2i(_icms_stop_limit),
-                               percent_of_space(space, _icms_stop_limit));
-      }
-      ConcurrentMarkSweepThread::start_icms();
-      assert(top < _icms_stop_limit, "Tautology");
-      if (word_size < pointer_delta(_icms_stop_limit, top)) {
-        return _icms_stop_limit;
-      }
-
-      // The allocation will cross both the _start and _stop limits, so do the
-      // stop notification also and return end().
-      if (CMSTraceIncrementalMode) {
-        space->print_on(gclog_or_tty);
-        gclog_or_tty->stamp();
-        gclog_or_tty->print_cr(" +stop limit top=" PTR_FORMAT
-                               ", new limit=" PTR_FORMAT
-                               " (" SIZE_FORMAT "%%)",
-                               p2i(top), p2i(space->end()),
-                               percent_of_space(space, space->end()));
-      }
-      ConcurrentMarkSweepThread::stop_icms();
-      return space->end();
-    }
-
-    if (top <= _icms_stop_limit) {
-      if (CMSTraceIncrementalMode) {
-        space->print_on(gclog_or_tty);
-        gclog_or_tty->stamp();
-        gclog_or_tty->print_cr(" stop limit top=" PTR_FORMAT
-                               ", new limit=" PTR_FORMAT
-                               " (" SIZE_FORMAT "%%)",
-                               top, space->end(),
-                               percent_of_space(space, space->end()));
-      }
-      ConcurrentMarkSweepThread::stop_icms();
-      return space->end();
-    }
-
-    if (CMSTraceIncrementalMode) {
-      space->print_on(gclog_or_tty);
-      gclog_or_tty->stamp();
-      gclog_or_tty->print_cr(" end limit top=" PTR_FORMAT
-                             ", new limit=" PTR_FORMAT,
-                             top, NULL);
-    }
-  }
-
-  return NULL;
-}
-
 oop ConcurrentMarkSweepGeneration::promote(oop obj, size_t obj_size) {
   assert(obj_size == (size_t)obj->size(), "bad obj_size passed in");
   // allocate, copy and if necessary update promoinfo --
@@ -1291,14 +1085,6 @@
 }
 
 
-HeapWord*
-ConcurrentMarkSweepGeneration::allocation_limit_reached(Space* space,
-                                             HeapWord* top,
-                                             size_t word_sz)
-{
-  return collector()->allocation_limit_reached(space, top, word_sz);
-}
-
 // IMPORTANT: Notes on object size recognition in CMS.
 // ---------------------------------------------------
 // A block of storage in the CMS generation is always in
@@ -1811,9 +1597,6 @@
   // we want to do a foreground collection.
   _foregroundGCIsActive = true;
 
-  // Disable incremental mode during a foreground collection.
-  ICMSDisabler icms_disabler;
-
   // release locks and wait for a notify from the background collector
   // releasing the locks in only necessary for phases which
   // do yields to improve the granularity of the collection.
@@ -2137,7 +1920,7 @@
 
 void CMSCollector::print_eden_and_survivor_chunk_arrays() {
   DefNewGeneration* dng = _young_gen->as_DefNewGeneration();
-  EdenSpace* eden_space = dng->eden();
+  ContiguousSpace* eden_space = dng->eden();
   ContiguousSpace* from_space = dng->from();
   ContiguousSpace* to_space   = dng->to();
   // Eden
@@ -2785,10 +2568,6 @@
   //
   _cmsGen->update_counters(cms_used);
 
-  if (CMSIncrementalMode) {
-    icms_update_allocation_limits();
-  }
-
   bitMapLock()->unlock();
   releaseFreelistLocks();
 
@@ -4276,12 +4055,10 @@
   assert_lock_strong(_bit_map_lock);
   _bit_map_lock->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // It is possible for whichever thread initiated the yield request
   // not to get a chance to wake up and take the bitmap lock between
@@ -4311,7 +4088,6 @@
                    ConcurrentMarkSweepThread::should_yield() &&
                    !CMSCollector::foregroundGCIsActive(); ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
@@ -5242,7 +5018,7 @@
 
 void CMSParMarkTask::work_on_young_gen_roots(uint worker_id, OopsInGenClosure* cl) {
   DefNewGeneration* dng = _collector->_young_gen->as_DefNewGeneration();
-  EdenSpace* eden_space = dng->eden();
+  ContiguousSpace* eden_space = dng->eden();
   ContiguousSpace* from_space = dng->from();
   ContiguousSpace* to_space   = dng->to();
 
@@ -6478,19 +6254,16 @@
         assert_lock_strong(bitMapLock());
         bitMapLock()->unlock();
         ConcurrentMarkSweepThread::desynchronize(true);
-        ConcurrentMarkSweepThread::acknowledge_yield_request();
         stopTimer();
         if (PrintCMSStatistics != 0) {
           incrementYields();
         }
-        icms_wait();
 
         // See the comment in coordinator_yield()
         for (unsigned i = 0; i < CMSYieldSleepCount &&
                          ConcurrentMarkSweepThread::should_yield() &&
                          !CMSCollector::foregroundGCIsActive(); ++i) {
           os::sleep(Thread::current(), 1, false);
-          ConcurrentMarkSweepThread::acknowledge_yield_request();
         }
 
         ConcurrentMarkSweepThread::synchronize(true);
@@ -6513,10 +6286,6 @@
     _collectorState = Idling;
   }
 
-  // Stop incremental mode after a cycle completes, so that any future cycles
-  // are triggered by allocation.
-  stop_icms();
-
   NOT_PRODUCT(
     if (RotateCMSCollectionTypes) {
       _cmsGen->rotate_debug_collection_type();
@@ -6968,12 +6737,10 @@
   _bit_map->lock()->unlock();
   _freelistLock->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // See the comment in coordinator_yield()
   for (unsigned i = 0;
@@ -6982,7 +6749,6 @@
        !CMSCollector::foregroundGCIsActive();
        ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
@@ -7128,19 +6894,16 @@
   _bitMap->lock()->unlock();
   _freelistLock->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // See the comment in coordinator_yield()
   for (unsigned i = 0; i < CMSYieldSleepCount &&
                    ConcurrentMarkSweepThread::should_yield() &&
                    !CMSCollector::foregroundGCIsActive(); ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
@@ -7200,19 +6963,16 @@
   // Relinquish the bit map lock
   _bit_map->lock()->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // See the comment in coordinator_yield()
   for (unsigned i = 0; i < CMSYieldSleepCount &&
                        ConcurrentMarkSweepThread::should_yield() &&
                        !CMSCollector::foregroundGCIsActive(); ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
@@ -7358,19 +7118,16 @@
   assert_lock_strong(_bitMap->lock());
   _bitMap->lock()->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // See the comment in coordinator_yield()
   for (unsigned i = 0; i < CMSYieldSleepCount &&
                        ConcurrentMarkSweepThread::should_yield() &&
                        !CMSCollector::foregroundGCIsActive(); ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
@@ -7392,7 +7149,7 @@
   _finger = ptr + obj->size();
   assert(_finger > ptr, "we just incremented it above");
   // On large heaps, it may take us some time to get through
-  // the marking phase (especially if running iCMS). During
+  // the marking phase. During
   // this time it's possible that a lot of mutations have
   // accumulated in the card table and the mod union table --
   // these mutation records are redundant until we have
@@ -7509,7 +7266,7 @@
   _finger = ptr + obj->size();
   assert(_finger > ptr, "we just incremented it above");
   // On large heaps, it may take us some time to get through
-  // the marking phase (especially if running iCMS). During
+  // the marking phase. During
   // this time it's possible that a lot of mutations have
   // accumulated in the card table and the mod union table --
   // these mutation records are redundant until we have
@@ -7998,20 +7755,16 @@
   bml->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
 
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
-
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // See the comment in coordinator_yield()
   for (unsigned i = 0; i < CMSYieldSleepCount &&
                        ConcurrentMarkSweepThread::should_yield() &&
                        !CMSCollector::foregroundGCIsActive(); ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
@@ -8679,19 +8432,16 @@
   _bitMap->lock()->unlock();
   _freelistLock->unlock();
   ConcurrentMarkSweepThread::desynchronize(true);
-  ConcurrentMarkSweepThread::acknowledge_yield_request();
   _collector->stopTimer();
   if (PrintCMSStatistics != 0) {
     _collector->incrementYields();
   }
-  _collector->icms_wait();
 
   // See the comment in coordinator_yield()
   for (unsigned i = 0; i < CMSYieldSleepCount &&
                        ConcurrentMarkSweepThread::should_yield() &&
                        !CMSCollector::foregroundGCIsActive(); ++i) {
     os::sleep(Thread::current(), 1, false);
-    ConcurrentMarkSweepThread::acknowledge_yield_request();
   }
 
   ConcurrentMarkSweepThread::synchronize(true);
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp
@@ -383,17 +383,7 @@
 
   unsigned int _valid_bits;
 
-  unsigned int _icms_duty_cycle;        // icms duty cycle (0-100).
-
  protected:
-
-  // Return a duty cycle that avoids wild oscillations, by limiting the amount
-  // of change between old_duty_cycle and new_duty_cycle (the latter is treated
-  // as a recommended value).
-  static unsigned int icms_damped_duty_cycle(unsigned int old_duty_cycle,
-                                             unsigned int new_duty_cycle);
-  unsigned int icms_update_duty_cycle_impl();
-
   // In support of adjusting of cms trigger ratios based on history
   // of concurrent mode failure.
   double cms_free_adjustment_factor(size_t free) const;
@@ -458,12 +448,6 @@
 
   // End of higher level statistics.
 
-  // Returns the cms incremental mode duty cycle, as a percentage (0-100).
-  unsigned int icms_duty_cycle() const { return _icms_duty_cycle; }
-
-  // Update the duty cycle and return the new value.
-  unsigned int icms_update_duty_cycle();
-
   // Debugging.
   void print_on(outputStream* st) const PRODUCT_RETURN;
   void print() const { print_on(gclog_or_tty); }
@@ -725,13 +709,6 @@
   // Timing, allocation and promotion statistics, used for scheduling.
   CMSStats      _stats;
 
-  // Allocation limits installed in the young gen, used only in
-  // CMSIncrementalMode.  When an allocation in the young gen would cross one of
-  // these limits, the cms generation is notified and the cms thread is started
-  // or stopped, respectively.
-  HeapWord*     _icms_start_limit;
-  HeapWord*     _icms_stop_limit;
-
   enum CMS_op_type {
     CMS_op_checkpointRootsInitial,
     CMS_op_checkpointRootsFinal
@@ -867,10 +844,6 @@
   // collector.
   bool waitForForegroundGC();
 
-  // Incremental mode triggering:  recompute the icms duty cycle and set the
-  // allocation limits in the young gen.
-  void icms_update_allocation_limits();
-
   size_t block_size_using_printezis_bits(HeapWord* addr) const;
   size_t block_size_if_printezis_bits(HeapWord* addr) const;
   HeapWord* next_card_start_after_block(HeapWord* addr) const;
@@ -928,9 +901,6 @@
   void promoted(bool par, HeapWord* start,
                 bool is_obj_array, size_t obj_size);
 
-  HeapWord* allocation_limit_reached(Space* space, HeapWord* top,
-                                     size_t word_size);
-
   void getFreelistLocks() const;
   void releaseFreelistLocks() const;
   bool haveFreelistLocks() const;
@@ -1001,14 +971,6 @@
   // Timers/stats for gc scheduling and incremental mode pacing.
   CMSStats& stats() { return _stats; }
 
-  // Convenience methods that check whether CMSIncrementalMode is enabled and
-  // forward to the corresponding methods in ConcurrentMarkSweepThread.
-  static void start_icms();
-  static void stop_icms();    // Called at the end of the cms cycle.
-  static void disable_icms(); // Called before a foreground collection.
-  static void enable_icms();  // Called after a foreground collection.
-  void icms_wait();          // Called at yield points.
-
   // Adaptive size policy
   AdaptiveSizePolicy* size_policy();
 
@@ -1211,9 +1173,6 @@
     return allocate(size, tlab);
   }
 
-  // Incremental mode triggering.
-  HeapWord* allocation_limit_reached(Space* space, HeapWord* top,
-                                     size_t word_size);
 
   // Used by CMSStats to track direct allocation.  The value is sampled and
   // reset after each young gen collection.
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp
@@ -234,36 +234,6 @@
   }
 }
 
-inline void CMSCollector::start_icms() {
-  if (CMSIncrementalMode) {
-    ConcurrentMarkSweepThread::start_icms();
-  }
-}
-
-inline void CMSCollector::stop_icms() {
-  if (CMSIncrementalMode) {
-    ConcurrentMarkSweepThread::stop_icms();
-  }
-}
-
-inline void CMSCollector::disable_icms() {
-  if (CMSIncrementalMode) {
-    ConcurrentMarkSweepThread::disable_icms();
-  }
-}
-
-inline void CMSCollector::enable_icms() {
-  if (CMSIncrementalMode) {
-    ConcurrentMarkSweepThread::enable_icms();
-  }
-}
-
-inline void CMSCollector::icms_wait() {
-  if (CMSIncrementalMode) {
-    cmsThread()->icms_wait();
-  }
-}
-
 inline void CMSCollector::save_sweep_limits() {
   _cmsGen->save_sweep_limit();
 }
@@ -400,15 +370,6 @@
   return (gc0_promoted() + cms_allocated()) / gc0_period();
 }
 
-inline unsigned int CMSStats::icms_update_duty_cycle() {
-  // Update the duty cycle only if pacing is enabled and the stats are valid
-  // (after at least one young gen gc and one cms cycle have completed).
-  if (CMSIncrementalPacing && valid()) {
-    return icms_update_duty_cycle_impl();
-  }
-  return _icms_duty_cycle;
-}
-
 inline void ConcurrentMarkSweepGeneration::save_sweep_limit() {
   cmsSpace()->save_sweep_limit();
 }
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp
@@ -49,13 +49,6 @@
 int  ConcurrentMarkSweepThread::_CMS_flag         = CMS_nil;
 
 volatile jint ConcurrentMarkSweepThread::_pending_yields      = 0;
-volatile jint ConcurrentMarkSweepThread::_pending_decrements  = 0;
-
-volatile jint ConcurrentMarkSweepThread::_icms_disabled   = 0;
-volatile bool ConcurrentMarkSweepThread::_should_run     = false;
-// When icms is enabled, the icms thread is stopped until explicitly
-// started.
-volatile bool ConcurrentMarkSweepThread::_should_stop    = true;
 
 SurrogateLockerThread*
      ConcurrentMarkSweepThread::_slt = NULL;
@@ -99,7 +92,6 @@
     }
   }
   _sltMonitor = SLT_lock;
-  assert(!CMSIncrementalMode || icms_is_enabled(), "Error");
 }
 
 void ConcurrentMarkSweepThread::run() {
@@ -184,11 +176,6 @@
 }
 
 void ConcurrentMarkSweepThread::stop() {
-  if (CMSIncrementalMode) {
-    // Disable incremental mode and wake up the thread so it notices the change.
-    disable_icms();
-    start_icms();
-  }
   // it is ok to take late safepoints here, if needed
   {
     MutexLockerEx x(Terminator_lock);
@@ -387,23 +374,13 @@
 
 void ConcurrentMarkSweepThread::sleepBeforeNextCycle() {
   while (!_should_terminate) {
-    if (CMSIncrementalMode) {
-      icms_wait();
-      if(CMSWaitDuration >= 0) {
-        // Wait until the next synchronous GC, a concurrent full gc
-        // request or a timeout, whichever is earlier.
-        wait_on_cms_lock_for_scavenge(CMSWaitDuration);
-      }
-      return;
+    if(CMSWaitDuration >= 0) {
+      // Wait until the next synchronous GC, a concurrent full gc
+      // request or a timeout, whichever is earlier.
+      wait_on_cms_lock_for_scavenge(CMSWaitDuration);
     } else {
-      if(CMSWaitDuration >= 0) {
-        // Wait until the next synchronous GC, a concurrent full gc
-        // request or a timeout, whichever is earlier.
-        wait_on_cms_lock_for_scavenge(CMSWaitDuration);
-      } else {
-        // Wait until any cms_lock event or check interval not to call shouldConcurrentCollect permanently
-        wait_on_cms_lock(CMSCheckInterval);
-      }
+      // Wait until any cms_lock event or check interval not to call shouldConcurrentCollect permanently
+      wait_on_cms_lock(CMSCheckInterval);
     }
     // Check if we should start a CMS collection cycle
     if (_collector->shouldConcurrentCollect()) {
@@ -414,42 +391,6 @@
   }
 }
 
-// Incremental CMS
-void ConcurrentMarkSweepThread::start_icms() {
-  assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking");
-  MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag);
-  trace_state("start_icms");
-  _should_run = true;
-  iCMS_lock->notify_all();
-}
-
-void ConcurrentMarkSweepThread::stop_icms() {
-  assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking");
-  MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag);
-  if (!_should_stop) {
-    trace_state("stop_icms");
-    _should_stop = true;
-    _should_run = false;
-    asynchronous_yield_request();
-    iCMS_lock->notify_all();
-  }
-}
-
-void ConcurrentMarkSweepThread::icms_wait() {
-  assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking");
-  if (_should_stop && icms_is_enabled()) {
-    MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag);
-    trace_state("pause_icms");
-    _collector->stats().stop_cms_timer();
-    while(!_should_run && icms_is_enabled()) {
-      iCMS_lock->wait(Mutex::_no_safepoint_check_flag);
-    }
-    _collector->stats().start_cms_timer();
-    _should_stop = false;
-    trace_state("pause_icms end");
-  }
-}
-
 // Note: this method, although exported by the ConcurrentMarkSweepThread,
 // which is a non-JavaThread, can only be called by a JavaThread.
 // Currently this is done at vm creation time (post-vm-init) by the
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp
@@ -64,20 +64,14 @@
   static bool clear_CMS_flag(int b)         { return (_CMS_flag &= ~b) != 0; }
   void sleepBeforeNextCycle();
 
-  // CMS thread should yield for a young gen collection, direct allocation,
-  // and iCMS activity.
+  // CMS thread should yield for a young gen collection and direct allocations
   static char _pad_1[64 - sizeof(jint)];    // prevent cache-line sharing
   static volatile jint _pending_yields;
-  static volatile jint _pending_decrements; // decrements to _pending_yields
   static char _pad_2[64 - sizeof(jint)];    // prevent cache-line sharing
 
   // Tracing messages, enabled by CMSTraceThreadState.
   static inline void trace_state(const char* desc);
 
-  static volatile int _icms_disabled;   // a counter to track #iCMS disable & enable
-  static volatile bool _should_run;     // iCMS may run
-  static volatile bool _should_stop;    // iCMS should stop
-
   // debugging
   void verify_ok_to_terminate() const PRODUCT_RETURN;
 
@@ -135,44 +129,13 @@
   void wait_on_cms_lock_for_scavenge(long t_millis);
 
   // The CMS thread will yield during the work portion of its cycle
-  // only when requested to.  Both synchronous and asychronous requests
-  // are provided:
-  // (1) A synchronous request is used for young gen collections and
-  //     for direct allocations.  The requesting thread increments
-  //     _pending_yields at the beginning of an operation, and decrements
-  //     _pending_yields when that operation is completed.
-  //     In turn, the CMS thread yields when _pending_yields is positive,
-  //     and continues to yield until the value reverts to 0.
-  // (2) An asynchronous request, on the other hand, is used by iCMS
-  //     for the stop_icms() operation. A single yield satisfies all of
-  //     the outstanding asynch yield requests, of which there may
-  //     occasionally be several in close succession. To accomplish
-  //     this, an asynch-requesting thread atomically increments both
-  //     _pending_yields and _pending_decrements. An asynchr requesting
-  //     thread does not wait and "acknowledge" completion of an operation
-  //     and deregister the request, like the synchronous version described
-  //     above does. In turn, after yielding, the CMS thread decrements both
-  //     _pending_yields and _pending_decrements by the value seen in
-  //     _pending_decrements before the decrement.
-  //  NOTE: The above scheme is isomorphic to having two request counters,
-  //  one for async requests and one for sync requests, and for the CMS thread
-  //  to check the sum of the two counters to decide whether it should yield
-  //  and to clear only the async counter when it yields. However, it turns out
-  //  to be more efficient for CMS code to just check a single counter
-  //  _pending_yields that holds the sum (of both sync and async requests), and
-  //  a second counter _pending_decrements that only holds the async requests,
-  //  for greater efficiency, since in a typical CMS run, there are many more
-  //  potential (i.e. static) yield points than there are actual
-  //  (i.e. dynamic) yields because of requests, which are few and far between.
-  //
-  // Note that, while "_pending_yields >= _pending_decrements" is an invariant,
-  // we cannot easily test that invariant, since the counters are manipulated via
-  // atomic instructions without explicit locking and we cannot read
-  // the two counters atomically together: one suggestion is to
-  // use (for example) 16-bit counters so as to be able to read the
-  // two counters atomically even on 32-bit platforms. Notice that
-  // the second assert in acknowledge_yield_request() below does indeed
-  // check a form of the above invariant, albeit indirectly.
+  // only when requested to.
+  // A synchronous request is used for young gen collections and
+  // for direct allocations.  The requesting thread increments
+  // _pending_yields at the beginning of an operation, and decrements
+  // _pending_yields when that operation is completed.
+  // In turn, the CMS thread yields when _pending_yields is positive,
+  // and continues to yield until the value reverts to 0.
 
   static void increment_pending_yields()   {
     Atomic::inc(&_pending_yields);
@@ -182,51 +145,7 @@
     Atomic::dec(&_pending_yields);
     assert(_pending_yields >= 0, "can't be negative");
   }
-  static void asynchronous_yield_request() {
-    assert(CMSIncrementalMode, "Currently only used w/iCMS");
-    increment_pending_yields();
-    Atomic::inc(&_pending_decrements);
-    assert(_pending_decrements >= 0, "can't be negative");
-  }
-  static void acknowledge_yield_request() {
-    jint decrement = _pending_decrements;
-    if (decrement > 0) {
-      assert(CMSIncrementalMode, "Currently only used w/iCMS");
-      // Order important to preserve: _pending_yields >= _pending_decrements
-      Atomic::add(-decrement, &_pending_decrements);
-      Atomic::add(-decrement, &_pending_yields);
-      assert(_pending_decrements >= 0, "can't be negative");
-      assert(_pending_yields >= 0, "can't be negative");
-    }
-  }
   static bool should_yield()   { return _pending_yields > 0; }
-
-  // CMS incremental mode.
-  static void start_icms(); // notify thread to start a quantum of work
-  static void stop_icms();  // request thread to stop working
-  void icms_wait();         // if asked to stop, wait until notified to start
-
-  // Incremental mode is enabled globally by the flag CMSIncrementalMode.  It
-  // must also be enabled/disabled dynamically to allow foreground collections.
-#define ICMS_ENABLING_ASSERT                                                      \
-          assert((CMSIncrementalMode  && _icms_disabled >= 0) ||                  \
-                 (!CMSIncrementalMode && _icms_disabled <= 0), "Error")
-
-  static inline void enable_icms() {
-    ICMS_ENABLING_ASSERT;
-    Atomic::dec(&_icms_disabled);
-  }
-  static inline void disable_icms() {
-   ICMS_ENABLING_ASSERT;
-   Atomic::inc(&_icms_disabled);
-  }
-  static inline bool icms_is_disabled() {
-   ICMS_ENABLING_ASSERT;
-   return _icms_disabled > 0;
-  }
-  static inline bool icms_is_enabled() {
-   return !icms_is_disabled();
-  }
 };
 
 inline void ConcurrentMarkSweepThread::trace_state(const char* desc) {
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp
@@ -207,12 +207,6 @@
   MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
   assert(_full_gc_count_before <= gch->total_full_collections(), "Error");
   if (gch->total_full_collections() == _full_gc_count_before) {
-    // Disable iCMS until the full collection is done, and
-    // remember that we did so.
-    CMSCollector::disable_icms();
-    _disabled_icms = true;
-    // In case CMS thread was in icms_wait(), wake it up.
-    CMSCollector::start_icms();
     // Nudge the CMS thread to start a concurrent collection.
     CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause);
   } else {
@@ -276,8 +270,4 @@
       FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
     }
   }
-  // Enable iCMS back if we disabled it earlier.
-  if (_disabled_icms) {
-    CMSCollector::enable_icms();
-  }
 }
diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp
@@ -128,13 +128,11 @@
 // VM operation to invoke a concurrent collection of the heap as a
 // GenCollectedHeap heap.
 class VM_GenCollectFullConcurrent: public VM_GC_Operation {
-  bool _disabled_icms;
  public:
   VM_GenCollectFullConcurrent(unsigned int gc_count_before,
                               unsigned int full_gc_count_before,
                               GCCause::Cause gc_cause)
-    : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
-      _disabled_icms(false)
+    : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */)
   {
     assert(FullGCCount_lock != NULL, "Error");
     assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
diff --git a/src/share/vm/memory/collectorPolicy.hpp b/src/share/vm/memory/collectorPolicy.hpp
--- a/src/share/vm/memory/collectorPolicy.hpp
+++ b/src/share/vm/memory/collectorPolicy.hpp
@@ -189,11 +189,6 @@
     return CollectorPolicy::CollectorPolicyKind;
   }
 
-  // Returns true if a collector has eden space with soft end.
-  virtual bool has_soft_ended_eden() {
-    return false;
-  }
-
   // Do any updates required to global flags that are due to heap initialization
   // changes
   virtual void post_heap_initialize() = 0;
diff --git a/src/share/vm/memory/defNewGeneration.cpp b/src/share/vm/memory/defNewGeneration.cpp
--- a/src/share/vm/memory/defNewGeneration.cpp
+++ b/src/share/vm/memory/defNewGeneration.cpp
@@ -194,11 +194,7 @@
                 (HeapWord*)_virtual_space.high());
   Universe::heap()->barrier_set()->resize_covered_region(cmr);
 
-  if (GenCollectedHeap::heap()->collector_policy()->has_soft_ended_eden()) {
-    _eden_space = new ConcEdenSpace(this);
-  } else {
-    _eden_space = new EdenSpace(this);
-  }
+  _eden_space = new ContiguousSpace();
   _from_space = new ContiguousSpace();
   _to_space   = new ContiguousSpace();
 
@@ -1038,38 +1034,12 @@
     if (CMSEdenChunksRecordAlways && _next_gen != NULL) {
       _next_gen->sample_eden_chunk();
     }
-    return result;
-  }
-  do {
-    HeapWord* old_limit = eden()->soft_end();
-    if (old_limit < eden()->end()) {
-      // Tell the next generation we reached a limit.
-      HeapWord* new_limit =
-        next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size);
-      if (new_limit != NULL) {
-        Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit);
-      } else {
-        assert(eden()->soft_end() == eden()->end(),
-               "invalid state after allocation_limit_reached returned null");
-      }
-    } else {
-      // The allocation failed and the soft limit is equal to the hard limit,
-      // there are no reasons to do an attempt to allocate
-      assert(old_limit == eden()->end(), "sanity check");
-      break;
-    }
-    // Try to allocate until succeeded or the soft limit can't be adjusted
-    result = eden()->par_allocate(word_size);
-  } while (result == NULL);
-
-  // If the eden is full and the last collection bailed out, we are running
-  // out of heap space, and we try to allocate the from-space, too.
-  // allocate_from_space can't be inlined because that would introduce a
-  // circular dependency at compile time.
-  if (result == NULL) {
+  } else {
+    // If the eden is full and the last collection bailed out, we are running
+    // out of heap space, and we try to allocate the from-space, too.
+    // allocate_from_space can't be inlined because that would introduce a
+    // circular dependency at compile time.
     result = allocate_from_space(word_size);
-  } else if (CMSEdenChunksRecordAlways && _next_gen != NULL) {
-    _next_gen->sample_eden_chunk();
   }
   return result;
 }
@@ -1083,11 +1053,6 @@
   return res;
 }
 
-void DefNewGeneration::gc_prologue(bool full) {
-  // Ensure that _end and _soft_end are the same in eden space.
-  eden()->set_soft_end(eden()->end());
-}
-
 size_t DefNewGeneration::tlab_capacity() const {
   return eden()->capacity();
 }
diff --git a/src/share/vm/memory/defNewGeneration.hpp b/src/share/vm/memory/defNewGeneration.hpp
--- a/src/share/vm/memory/defNewGeneration.hpp
+++ b/src/share/vm/memory/defNewGeneration.hpp
@@ -32,7 +32,6 @@
 #include "memory/generation.inline.hpp"
 #include "utilities/stack.hpp"
 
-class EdenSpace;
 class ContiguousSpace;
 class ScanClosure;
 class STWGCTimer;
@@ -132,7 +131,7 @@
   void adjust_desired_tenuring_threshold();
 
   // Spaces
-  EdenSpace*       _eden_space;
+  ContiguousSpace* _eden_space;
   ContiguousSpace* _from_space;
   ContiguousSpace* _to_space;
 
@@ -214,9 +213,9 @@
   virtual Generation::Name kind() { return Generation::DefNew; }
 
   // Accessing spaces
-  EdenSpace*       eden() const           { return _eden_space; }
-  ContiguousSpace* from() const           { return _from_space;  }
-  ContiguousSpace* to()   const           { return _to_space;    }
+  ContiguousSpace* eden() const           { return _eden_space; }
+  ContiguousSpace* from() const           { return _from_space; }
+  ContiguousSpace* to()   const           { return _to_space;   }
 
   virtual CompactibleSpace* first_compaction_space() const;
 
@@ -282,8 +281,6 @@
 
   HeapWord* par_allocate(size_t word_size, bool is_tlab);
 
-  // Prologue & Epilogue
-  virtual void gc_prologue(bool full);
   virtual void gc_epilogue(bool full);
 
   // Save the tops for eden, from, and to
diff --git a/src/share/vm/memory/generation.hpp b/src/share/vm/memory/generation.hpp
--- a/src/share/vm/memory/generation.hpp
+++ b/src/share/vm/memory/generation.hpp
@@ -265,14 +265,6 @@
   // Like "allocate", but performs any necessary locking internally.
   virtual HeapWord* par_allocate(size_t word_size, bool is_tlab) = 0;
 
-  // A 'younger' gen has reached an allocation limit, and uses this to notify
-  // the next older gen.  The return value is a new limit, or NULL if none.  The
-  // caller must do the necessary locking.
-  virtual HeapWord* allocation_limit_reached(Space* space, HeapWord* top,
-                                             size_t word_size) {
-    return NULL;
-  }
-
   // Some generation may offer a region for shared, contiguous allocation,
   // via inlined code (by exporting the address of the top and end fields
   // defining the extent of the contiguous allocation region.)
diff --git a/src/share/vm/memory/space.cpp b/src/share/vm/memory/space.cpp
--- a/src/share/vm/memory/space.cpp
+++ b/src/share/vm/memory/space.cpp
@@ -684,13 +684,12 @@
 }
 
 // This version requires locking.
-inline HeapWord* ContiguousSpace::allocate_impl(size_t size,
-                                                HeapWord* const end_value) {
+inline HeapWord* ContiguousSpace::allocate_impl(size_t size) {
   assert(Heap_lock->owned_by_self() ||
          (SafepointSynchronize::is_at_safepoint() && Thread::current()->is_VM_thread()),
          "not locked");
   HeapWord* obj = top();
-  if (pointer_delta(end_value, obj) >= size) {
+  if (pointer_delta(end(), obj) >= size) {
     HeapWord* new_top = obj + size;
     set_top(new_top);
     assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");
@@ -701,11 +700,10 @@
 }
 
 // This version is lock-free.
-inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size,
-                                                    HeapWord* const end_value) {
+inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size) {
   do {
     HeapWord* obj = top();
-    if (pointer_delta(end_value, obj) >= size) {
+    if (pointer_delta(end(), obj) >= size) {
       HeapWord* new_top = obj + size;
       HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj);
       // result can be one of two:
@@ -744,12 +742,12 @@
 
 // Requires locking.
 HeapWord* ContiguousSpace::allocate(size_t size) {
-  return allocate_impl(size, end());
+  return allocate_impl(size);
 }
 
 // Lock-free.
 HeapWord* ContiguousSpace::par_allocate(size_t size) {
-  return par_allocate_impl(size, end());
+  return par_allocate_impl(size);
 }
 
 void ContiguousSpace::allocate_temporary_filler(int factor) {
@@ -784,49 +782,6 @@
   }
 }
 
-void EdenSpace::clear(bool mangle_space) {
-  ContiguousSpace::clear(mangle_space);
-  set_soft_end(end());
-}
-
-// Requires locking.
-HeapWord* EdenSpace::allocate(size_t size) {
-  return allocate_impl(size, soft_end());
-}
-
-// Lock-free.
-HeapWord* EdenSpace::par_allocate(size_t size) {
-  return par_allocate_impl(size, soft_end());
-}
-
-HeapWord* ConcEdenSpace::par_allocate(size_t size)
-{
-  do {
-    // The invariant is top() should be read before end() because
-    // top() can't be greater than end(), so if an update of _soft_end
-    // occurs between 'end_val = end();' and 'top_val = top();' top()
-    // also can grow up to the new end() and the condition
-    // 'top_val > end_val' is true. To ensure the loading order
-    // OrderAccess::loadload() is required after top() read.
-    HeapWord* obj = top();
-    OrderAccess::loadload();
-    if (pointer_delta(*soft_end_addr(), obj) >= size) {
-      HeapWord* new_top = obj + size;
-      HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj);
-      // result can be one of two:
-      //  the old top value: the exchange succeeded
-      //  otherwise: the new value of the top is returned.
-      if (result == obj) {
-        assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");
-        return obj;
-      }
-    } else {
-      return NULL;
-    }
-  } while (true);
-}
-
-
 HeapWord* OffsetTableContigSpace::initialize_threshold() {
   return _offsets.initialize_threshold();
 }
diff --git a/src/share/vm/memory/space.hpp b/src/share/vm/memory/space.hpp
--- a/src/share/vm/memory/space.hpp
+++ b/src/share/vm/memory/space.hpp
@@ -41,19 +41,6 @@
 // implementations for keeping track of free and used space,
 // for iterating over objects and free blocks, etc.
 
-// Here's the Space hierarchy:
-//
-// - Space               -- an abstract base class describing a heap area
-//   - CompactibleSpace  -- a space supporting compaction
-//     - CompactibleFreeListSpace -- (used for CMS generation)
-//     - ContiguousSpace -- a compactible space in which all free space
-//                          is contiguous
-//       - EdenSpace     -- contiguous space used as nursery
-//         - ConcEdenSpace -- contiguous space with a 'soft end safe' allocation
-//       - OffsetTableContigSpace -- contiguous space with a block offset array
-//                          that allows "fast" block_start calls
-//         - TenuredSpace -- (used for TenuredGeneration)
-
 // Forward decls.
 class Space;
 class BlockOffsetArray;
@@ -467,8 +454,8 @@
   GenSpaceMangler* mangler() { return _mangler; }
 
   // Allocation helpers (return NULL if full).
-  inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value);
-  inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value);
+  inline HeapWord* allocate_impl(size_t word_size);
+  inline HeapWord* par_allocate_impl(size_t word_size);
 
  public:
   ContiguousSpace();
@@ -685,56 +672,6 @@
   {}
 };
 
-
-// Class EdenSpace describes eden-space in new generation.
-
-class DefNewGeneration;
-
-class EdenSpace : public ContiguousSpace {
-  friend class VMStructs;
- private:
-  DefNewGeneration* _gen;
-
-  // _soft_end is used as a soft limit on allocation.  As soft limits are
-  // reached, the slow-path allocation code can invoke other actions and then
-  // adjust _soft_end up to a new soft limit or to end().
-  HeapWord* _soft_end;
-
- public:
-  EdenSpace(DefNewGeneration* gen) :
-   _gen(gen), _soft_end(NULL) {}
-
-  // Get/set just the 'soft' limit.
-  HeapWord* soft_end()               { return _soft_end; }
-  HeapWord** soft_end_addr()         { return &_soft_end; }
-  void set_soft_end(HeapWord* value) { _soft_end = value; }
-
-  // Override.
-  void clear(bool mangle_space);
-
-  // Set both the 'hard' and 'soft' limits (_end and _soft_end).
-  void set_end(HeapWord* value) {
-    set_soft_end(value);
-    ContiguousSpace::set_end(value);
-  }
-
-  // Allocation (return NULL if full)
-  HeapWord* allocate(size_t word_size);
-  HeapWord* par_allocate(size_t word_size);
-};
-
-// Class ConcEdenSpace extends EdenSpace for the sake of safe
-// allocation while soft-end is being modified concurrently
-
-class ConcEdenSpace : public EdenSpace {
- public:
-  ConcEdenSpace(DefNewGeneration* gen) : EdenSpace(gen) { }
-
-  // Allocation (return NULL if full)
-  HeapWord* par_allocate(size_t word_size);
-};
-
-
 // A ContigSpace that Supports an efficient "block_start" operation via
 // a BlockOffsetArray (whose BlockOffsetSharedArray may be shared with
 // other spaces.)  This is the abstract base class for old generation
diff --git a/src/share/vm/opto/macro.cpp b/src/share/vm/opto/macro.cpp
--- a/src/share/vm/opto/macro.cpp
+++ b/src/share/vm/opto/macro.cpp
@@ -1197,8 +1197,7 @@
   }
 
   if (C->env()->dtrace_alloc_probes() ||
-      !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() ||
-                   (UseConcMarkSweepGC && CMSIncrementalMode))) {
+      !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc())) {
     // Force slow-path allocation
     always_slow = true;
     initial_slow_test = NULL;
diff --git a/src/share/vm/runtime/arguments.cpp b/src/share/vm/runtime/arguments.cpp
--- a/src/share/vm/runtime/arguments.cpp
+++ b/src/share/vm/runtime/arguments.cpp
@@ -1733,7 +1733,7 @@
 #ifdef ASSERT
 static bool verify_serial_gc_flags() {
   return (UseSerialGC &&
-        !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
+        !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
           UseParallelGC || UseParallelOldGC));
 }
 #endif // ASSERT
@@ -2147,10 +2147,6 @@
     warning("Using the ParNew young collector with the Serial old collector is deprecated "
         "and will likely be removed in a future release");
   }
-
-  if (CMSIncrementalMode) {
-    warning("Using incremental CMS is deprecated and will likely be removed in a future release");
-  }
 }
 
 void Arguments::check_deprecated_gc_flags() {
@@ -2272,31 +2268,8 @@
   status = status && ArgumentsExt::check_gc_consistency_user();
   status = status && check_stack_pages();
 
-  if (CMSIncrementalMode) {
-    if (!UseConcMarkSweepGC) {
-      jio_fprintf(defaultStream::error_stream(),
-                  "error:  invalid argument combination.\n"
-                  "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
-                  "selected in order\nto use CMSIncrementalMode.\n");
-      status = false;
-    } else {
-      status = status && verify_percentage(CMSIncrementalDutyCycle,
-                                  "CMSIncrementalDutyCycle");
-      status = status && verify_percentage(CMSIncrementalDutyCycleMin,
-                                  "CMSIncrementalDutyCycleMin");
-      status = status && verify_percentage(CMSIncrementalSafetyFactor,
-                                  "CMSIncrementalSafetyFactor");
-      status = status && verify_percentage(CMSIncrementalOffset,
-                                  "CMSIncrementalOffset");
-      status = status && verify_percentage(CMSExpAvgFactor,
-                                  "CMSExpAvgFactor");
-      // If it was not set on the command line, set
-      // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
-      if (CMSInitiatingOccupancyFraction < 0) {
-        FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
-      }
-    }
-  }
+  status = status && verify_percentage(CMSIncrementalSafetyFactor,
+                                    "CMSIncrementalSafetyFactor");
 
   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
   // insists that we hold the requisite locks so that the iteration is
@@ -2829,14 +2802,6 @@
     // -Xnoclassgc
     } else if (match_option(option, "-Xnoclassgc", &tail)) {
       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
-    // -Xincgc: i-CMS
-    } else if (match_option(option, "-Xincgc", &tail)) {
-      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
-      FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
-    // -Xnoincgc: no i-CMS
-    } else if (match_option(option, "-Xnoincgc", &tail)) {
-      FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
-      FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
     // -Xconcgc
     } else if (match_option(option, "-Xconcgc", &tail)) {
       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
@@ -3664,7 +3629,6 @@
 #if !INCLUDE_ALL_GCS
 static void force_serial_gc() {
   FLAG_SET_DEFAULT(UseSerialGC, true);
-  FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
   UNSUPPORTED_GC_OPTION(UseG1GC);
   UNSUPPORTED_GC_OPTION(UseParallelGC);
   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
diff --git a/src/share/vm/runtime/globals.hpp b/src/share/vm/runtime/globals.hpp
--- a/src/share/vm/runtime/globals.hpp
+++ b/src/share/vm/runtime/globals.hpp
@@ -1633,30 +1633,10 @@
           "The maximum size of young gen chosen by default per GC worker "  \
           "thread available")                                               \
                                                                             \
-  product(bool, CMSIncrementalMode, false,                                  \
-          "Whether CMS GC should operate in \"incremental\" mode")          \
-                                                                            \
-  product(uintx, CMSIncrementalDutyCycle, 10,                               \
-          "Percentage (0-100) of CMS incremental mode duty cycle. If "      \
-          "CMSIncrementalPacing is enabled, then this is just the initial " \
-          "value.")                                                         \
-                                                                            \
-  product(bool, CMSIncrementalPacing, true,                                 \
-          "Whether the CMS incremental mode duty cycle should be "          \
-          "automatically adjusted")                                         \
-                                                                            \
-  product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
-          "Minimum percentage (0-100) of the CMS incremental duty cycle "   \
-          "used when CMSIncrementalPacing is enabled")                      \
-                                                                            \
   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
           "Percentage (0-100) used to add conservatism when computing the " \
           "duty cycle")                                                     \
                                                                             \
-  product(uintx, CMSIncrementalOffset, 0,                                   \
-          "Percentage (0-100) by which the CMS incremental mode duty cycle "\
-          "is shifted to the right within the period between young GCs")    \
-                                                                            \
   product(uintx, CMSExpAvgFactor, 50,                                       \
           "Percentage (0-100) used to weight the current sample when "      \
           "computing exponential averages for CMS statistics")              \
@@ -1715,12 +1695,6 @@
           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
           "duration exceeds this threshold in milliseconds")                \
                                                                             \
-  develop(bool, CMSTraceIncrementalMode, false,                             \
-          "Trace CMS incremental mode")                                     \
-                                                                            \
-  develop(bool, CMSTraceIncrementalPacing, false,                           \
-          "Trace CMS incremental mode pacing computation")                  \
-                                                                            \
   develop(bool, CMSTraceThreadState, false,                                 \
           "Trace the CMS thread state (enable the trace_state() method)")   \
                                                                             \
diff --git a/src/share/vm/runtime/mutexLocker.cpp b/src/share/vm/runtime/mutexLocker.cpp
--- a/src/share/vm/runtime/mutexLocker.cpp
+++ b/src/share/vm/runtime/mutexLocker.cpp
@@ -72,7 +72,6 @@
 Monitor* CGC_lock                     = NULL;
 Monitor* STS_lock                     = NULL;
 Monitor* SLT_lock                     = NULL;
-Monitor* iCMS_lock                    = NULL;
 Monitor* FullGCCount_lock             = NULL;
 Monitor* CMark_lock                   = NULL;
 Mutex*   CMRegionStack_lock           = NULL;
@@ -175,9 +174,6 @@
 
   def(CGC_lock                   , Monitor, special,     true ); // coordinate between fore- and background GC
   def(STS_lock                   , Monitor, leaf,        true );
-  if (UseConcMarkSweepGC) {
-    def(iCMS_lock                  , Monitor, special,     true ); // CMS incremental mode start/stop notification
-  }
   if (UseConcMarkSweepGC || UseG1GC) {
     def(FullGCCount_lock           , Monitor, leaf,        true ); // in support of ExplicitGCInvokesConcurrent
   }
diff --git a/src/share/vm/runtime/mutexLocker.hpp b/src/share/vm/runtime/mutexLocker.hpp
--- a/src/share/vm/runtime/mutexLocker.hpp
+++ b/src/share/vm/runtime/mutexLocker.hpp
@@ -66,7 +66,6 @@
                                                  // fore- & background GC threads.
 extern Monitor* STS_lock;                        // used for joining/leaving SuspendibleThreadSet.
 extern Monitor* SLT_lock;                        // used in CMS GC for acquiring PLL
-extern Monitor* iCMS_lock;                       // CMS incremental mode start/stop notification
 extern Monitor* FullGCCount_lock;                // in support of "concurrent" full gc
 extern Monitor* CMark_lock;                      // used for concurrent mark thread coordination
 extern Mutex*   CMRegionStack_lock;              // used for protecting accesses to the CM region stack
diff --git a/src/share/vm/runtime/vmStructs.cpp b/src/share/vm/runtime/vmStructs.cpp
--- a/src/share/vm/runtime/vmStructs.cpp
+++ b/src/share/vm/runtime/vmStructs.cpp
@@ -527,12 +527,10 @@
   nonstatic_field(DefNewGeneration,            _next_gen,                                     Generation*)                           \
   nonstatic_field(DefNewGeneration,            _tenuring_threshold,                           uint)                                  \
   nonstatic_field(DefNewGeneration,            _age_table,                                    ageTable)                              \
-  nonstatic_field(DefNewGeneration,            _eden_space,                                   EdenSpace*)                            \
+  nonstatic_field(DefNewGeneration,            _eden_space,                                   ContiguousSpace*)                      \
   nonstatic_field(DefNewGeneration,            _from_space,                                   ContiguousSpace*)                      \
   nonstatic_field(DefNewGeneration,            _to_space,                                     ContiguousSpace*)                      \
                                                                                                                                      \
-  nonstatic_field(EdenSpace,                   _gen,                                          DefNewGeneration*)                     \
-                                                                                                                                     \
   nonstatic_field(Generation,                  _reserved,                                     MemRegion)                             \
   nonstatic_field(Generation,                  _virtual_space,                                VirtualSpace)                          \
   nonstatic_field(Generation,                  _level,                                        int)                                   \
@@ -1490,7 +1488,6 @@
   declare_toplevel_type(BitMap)                                           \
            declare_type(CompactibleSpace,             Space)              \
            declare_type(ContiguousSpace,              CompactibleSpace)   \
-           declare_type(EdenSpace,                    ContiguousSpace)    \
            declare_type(OffsetTableContigSpace,       ContiguousSpace)    \
            declare_type(TenuredSpace,                 OffsetTableContigSpace) \
   declare_toplevel_type(BarrierSet)                                       \
@@ -1532,7 +1529,6 @@
   declare_toplevel_type(CollectedHeap*)                                   \
   declare_toplevel_type(ContiguousSpace*)                                 \
   declare_toplevel_type(DefNewGeneration*)                                \
-  declare_toplevel_type(EdenSpace*)                                       \
   declare_toplevel_type(GenCollectedHeap*)                                \
   declare_toplevel_type(Generation*)                                      \
   declare_toplevel_type(GenerationSpec**)                                 \
diff --git a/test/TEST.groups b/test/TEST.groups
--- a/test/TEST.groups
+++ b/test/TEST.groups
@@ -175,11 +175,8 @@
   gc/g1/TestShrinkToOneRegion.java \
   gc/metaspace/G1AddMetaspaceDependency.java \
   gc/startup_warnings/TestCMS.java \
-  gc/startup_warnings/TestCMSIncrementalMode.java \
-  gc/startup_warnings/TestCMSNoIncrementalMode.java \
   gc/startup_warnings/TestDefaultMaxRAMFraction.java \
   gc/startup_warnings/TestDefNewCMS.java \
-  gc/startup_warnings/TestIncGC.java \
   gc/startup_warnings/TestParallelGC.java \
   gc/startup_warnings/TestParallelScavengeSerialOld.java \
   gc/startup_warnings/TestParNewCMS.java \
@@ -273,8 +270,6 @@
   gc/class_unloading/TestCMSClassUnloadingEnabledHWM.java \
   gc/concurrentMarkSweep/ \
   gc/startup_warnings/TestCMS.java \
-  gc/startup_warnings/TestCMSIncrementalMode.java \
-  gc/startup_warnings/TestCMSNoIncrementalMode.java \
   gc/startup_warnings/TestDefNewCMS.java \
   gc/startup_warnings/TestParNewCMS.java
 
diff --git a/test/gc/g1/TestShrinkAuxiliaryData.java b/test/gc/g1/TestShrinkAuxiliaryData.java
--- a/test/gc/g1/TestShrinkAuxiliaryData.java
+++ b/test/gc/g1/TestShrinkAuxiliaryData.java
@@ -279,8 +279,7 @@
             "-XX:\\+UseConcMarkSweepGC",
             "-XX:\\+UseParallelOldGC",
             "-XX:\\+UseParNewGC",
-            "-Xconcgc",
-            "-Xincgc"
+            "-Xconcgc"
         };
     }
 }
diff --git a/test/gc/startup_warnings/TestCMSIncrementalMode.java b/test/gc/startup_warnings/TestCMSIncrementalMode.java
deleted file mode 100644
--- a/test/gc/startup_warnings/TestCMSIncrementalMode.java
+++ /dev/null
@@ -1,46 +0,0 @@
-
-/*
-* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
-* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-*
-* This code is free software; you can redistribute it and/or modify it
-* under the terms of the GNU General Public License version 2 only, as
-* published by the Free Software Foundation.
-*
-* This code is distributed in the hope that it will be useful, but WITHOUT
-* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-* version 2 for more details (a copy is included in the LICENSE file that
-* accompanied this code).
-*
-* You should have received a copy of the GNU General Public License version
-* 2 along with this work; if not, write to the Free Software Foundation,
-* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-*
-* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-* or visit www.oracle.com if you need additional information or have any
-* questions.
-*/
-
-/*
-* @test TestCMSIncrementalMode
-* @key gc
-* @bug 8006398
-* @summary Test that the deprecated CMSIncrementalMode print a warning message
-* @library /testlibrary
-*/
-
-import com.oracle.java.testlibrary.OutputAnalyzer;
-import com.oracle.java.testlibrary.ProcessTools;
-
-public class TestCMSIncrementalMode {
-
-  public static void main(String args[]) throws Exception {
-    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseConcMarkSweepGC", "-XX:+CMSIncrementalMode", "-version");
-    OutputAnalyzer output = new OutputAnalyzer(pb.start());
-    output.shouldContain("warning: Using incremental CMS is deprecated and will likely be removed in a future release");
-    output.shouldNotContain("error");
-    output.shouldHaveExitValue(0);
-  }
-
-}
diff --git a/test/gc/startup_warnings/TestCMSNoIncrementalMode.java b/test/gc/startup_warnings/TestCMSNoIncrementalMode.java
deleted file mode 100644
--- a/test/gc/startup_warnings/TestCMSNoIncrementalMode.java
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
-* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
-* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-*
-* This code is free software; you can redistribute it and/or modify it
-* under the terms of the GNU General Public License version 2 only, as
-* published by the Free Software Foundation.
-*
-* This code is distributed in the hope that it will be useful, but WITHOUT
-* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-* version 2 for more details (a copy is included in the LICENSE file that
-* accompanied this code).
-*
-* You should have received a copy of the GNU General Public License version
-* 2 along with this work; if not, write to the Free Software Foundation,
-* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-*
-* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-* or visit www.oracle.com if you need additional information or have any
-* questions.
-*/
-
-/*
-* @test TestCMSNoIncrementalMode
-* @key gc
-* @bug 8006398
-* @summary Test that CMS with incremental mode turned off does not print a warning message
-* @library /testlibrary
-*/
-
-import com.oracle.java.testlibrary.OutputAnalyzer;
-import com.oracle.java.testlibrary.ProcessTools;
-
-public class TestCMSNoIncrementalMode {
-
-  public static void main(String args[]) throws Exception {
-    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseConcMarkSweepGC", "-XX:-CMSIncrementalMode", "-version");
-    OutputAnalyzer output = new OutputAnalyzer(pb.start());
-    output.shouldNotContain("deprecated");
-    output.shouldNotContain("error");
-    output.shouldHaveExitValue(0);
-  }
-
-}
diff --git a/test/gc/startup_warnings/TestIncGC.java b/test/gc/startup_warnings/TestIncGC.java
deleted file mode 100644
--- a/test/gc/startup_warnings/TestIncGC.java
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
-* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
-* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-*
-* This code is free software; you can redistribute it and/or modify it
-* under the terms of the GNU General Public License version 2 only, as
-* published by the Free Software Foundation.
-*
-* This code is distributed in the hope that it will be useful, but WITHOUT
-* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-* version 2 for more details (a copy is included in the LICENSE file that
-* accompanied this code).
-*
-* You should have received a copy of the GNU General Public License version
-* 2 along with this work; if not, write to the Free Software Foundation,
-* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-*
-* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-* or visit www.oracle.com if you need additional information or have any
-* questions.
-*/
-
-/*
-* @test TestIncGC
-* @key gc
-* @bug 8006398
-* @summary Test that the deprecated -Xincgc print a warning message
-* @library /testlibrary
-*/
-
-import com.oracle.java.testlibrary.OutputAnalyzer;
-import com.oracle.java.testlibrary.ProcessTools;
-
-
-public class TestIncGC {
-
-  public static void main(String args[]) throws Exception {
-    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xincgc", "-version");
-    OutputAnalyzer output = new OutputAnalyzer(pb.start());
-    output.shouldContain("warning: Using incremental CMS is deprecated and will likely be removed in a future release");
-    output.shouldNotContain("error");
-    output.shouldHaveExitValue(0);
-  }
-
-}