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src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
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rev 7209 : [mq]: inccms
*** 165,184 ****
_locker3(mutex3, Mutex::_no_safepoint_check_flag)
{ }
};
- // 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 /////////////////////////////
//////////////////////////////////////////////////////////////////
NOT_PRODUCT(CompactibleFreeListSpace* debug_cms_space;)
--- 165,174 ----
*** 361,371 ****
_cms_used_at_gc0_begin = 0;
_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 {
// TBD: CR 6909490
return 1.0;
--- 351,360 ----
*** 440,514 ****
return 0.0;
}
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);
st->print(",gc0_dur=%g,gc0_per=%g,gc0_promo=" SIZE_FORMAT,
gc0_duration(), gc0_period(), gc0_promoted());
--- 429,438 ----
*** 517,529 ****
cms_period(), cms_allocated());
st->print(",cms_since_beg=%g,cms_since_end=%g",
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",
promotion_rate(), cms_allocation_rate());
st->print(",cms_consumption_rate=%g,time_until_full=%g",
--- 441,450 ----
*** 577,588 ****
#ifndef PRODUCT
_num_par_pushes(0),
#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),
_should_unload_classes(CMSClassUnloadingEnabled),
_concurrent_cycles_since_last_unload(0),
--- 498,507 ----
*** 1122,1256 ****
{
size_t delta = pointer_delta(addr, space->bottom());
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 --
// delegate to underlying space.
assert_lock_strong(freelistLock());
--- 1041,1050 ----
*** 1289,1306 ****
}
return res;
}
- 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
// one of three states. A free block (FREE), an allocated
// object (OBJECT) whose size() method reports the correct size,
--- 1083,1092 ----
*** 1809,1821 ****
// Signal to a possibly ongoing concurrent collection that
// 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.
assert_lock_strong(bitMapLock());
// We need to lock the Free list lock for the space that we are
--- 1595,1604 ----
*** 2135,2145 ****
}
void CMSCollector::print_eden_and_survivor_chunk_arrays() {
DefNewGeneration* dng = _young_gen->as_DefNewGeneration();
! EdenSpace* eden_space = dng->eden();
ContiguousSpace* from_space = dng->from();
ContiguousSpace* to_space = dng->to();
// Eden
if (_eden_chunk_array != NULL) {
gclog_or_tty->print_cr("eden " PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "(" SIZE_FORMAT ")",
--- 1918,1928 ----
}
void CMSCollector::print_eden_and_survivor_chunk_arrays() {
DefNewGeneration* dng = _young_gen->as_DefNewGeneration();
! ContiguousSpace* eden_space = dng->eden();
ContiguousSpace* from_space = dng->from();
ContiguousSpace* to_space = dng->to();
// Eden
if (_eden_chunk_array != NULL) {
gclog_or_tty->print_cr("eden " PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "(" SIZE_FORMAT ")",
*** 2783,2796 ****
// update_counters() that allows the utilization to be passed as a
// parameter, avoiding multiple calls to used().
//
_cmsGen->update_counters(cms_used);
- if (CMSIncrementalMode) {
- icms_update_allocation_limits();
- }
-
bitMapLock()->unlock();
releaseFreelistLocks();
if (!CleanChunkPoolAsync) {
Chunk::clean_chunk_pool();
--- 2566,2575 ----
*** 4274,4289 ****
// do this unlock/lock or modify the MutexUnlocker class to
// serve our purpose. XXX
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
// this thread releasing it and reacquiring it. So, while the
// should_yield() flag is on, let's sleep for a bit to give the
--- 4053,4066 ----
*** 4309,4319 ****
// Tony 2006.06.29
for (unsigned i = 0; i < CMSCoordinatorYieldSleepCount &&
ConcurrentMarkSweepThread::should_yield() &&
!CMSCollector::foregroundGCIsActive(); ++i) {
os::sleep(Thread::current(), 1, false);
- ConcurrentMarkSweepThread::acknowledge_yield_request();
}
ConcurrentMarkSweepThread::synchronize(true);
_bit_map_lock->lock_without_safepoint_check();
_collector->startTimer();
--- 4086,4095 ----
*** 5240,5250 ****
}
};
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* from_space = dng->from();
ContiguousSpace* to_space = dng->to();
HeapWord** eca = _collector->_eden_chunk_array;
size_t ect = _collector->_eden_chunk_index;
--- 5016,5026 ----
}
};
void CMSParMarkTask::work_on_young_gen_roots(uint worker_id, OopsInGenClosure* cl) {
DefNewGeneration* dng = _collector->_young_gen->as_DefNewGeneration();
! ContiguousSpace* eden_space = dng->eden();
ContiguousSpace* from_space = dng->from();
ContiguousSpace* to_space = dng->to();
HeapWord** eca = _collector->_eden_chunk_array;
size_t ect = _collector->_eden_chunk_index;
*** 6476,6498 ****
assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
"CMS thread should hold CMS token");
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);
bitMapLock()->lock_without_safepoint_check();
startTimer();
--- 6252,6271 ----
*** 6511,6524 ****
assert_lock_strong(bitMapLock());
_markBitMap.clear_all();
_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();
}
)
--- 6284,6293 ----
*** 6966,6990 ****
assert_lock_strong(_bit_map->lock());
// relinquish the free_list_lock and bitMaplock()
_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;
i < CMSYieldSleepCount &&
ConcurrentMarkSweepThread::should_yield() &&
!CMSCollector::foregroundGCIsActive();
++i) {
os::sleep(Thread::current(), 1, false);
- ConcurrentMarkSweepThread::acknowledge_yield_request();
}
ConcurrentMarkSweepThread::synchronize(true);
_freelistLock->lock_without_safepoint_check();
_bit_map->lock()->lock_without_safepoint_check();
--- 6735,6756 ----
*** 7126,7148 ****
assert_lock_strong(_bitMap->lock());
// relinquish the free_list_lock and bitMaplock()
_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);
_freelistLock->lock_without_safepoint_check();
_bitMap->lock()->lock_without_safepoint_check();
--- 6892,6911 ----
*** 7198,7220 ****
"CMS thread should hold CMS token");
assert_lock_strong(_bit_map->lock());
// 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);
_bit_map->lock()->lock_without_safepoint_check();
_collector->startTimer();
--- 6961,6980 ----
*** 7356,7378 ****
assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
"CMS thread should hold CMS token");
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);
_bitMap->lock()->lock_without_safepoint_check();
_collector->startTimer();
--- 7116,7135 ----
*** 7390,7400 ****
assert(_finger <= ptr, "_finger runneth ahead");
// advance the finger to right end of this object
_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
// 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
// actually traced into the corresponding card.
// Here, we check whether advancing the finger would make
--- 7147,7157 ----
assert(_finger <= ptr, "_finger runneth ahead");
// advance the finger to right end of this object
_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. 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
// actually traced into the corresponding card.
// Here, we check whether advancing the finger would make
*** 7507,7517 ****
assert(_finger <= ptr, "_finger runneth ahead");
// advance the finger to right end of this object
_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
// 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
// actually traced into the corresponding card.
// Here, we check whether advancing the finger would make
--- 7264,7274 ----
assert(_finger <= ptr, "_finger runneth ahead");
// advance the finger to right end of this object
_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. 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
// actually traced into the corresponding card.
// Here, we check whether advancing the finger would make
*** 7996,8019 ****
"CMS thread should hold CMS token");
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);
bml->lock();
--- 7753,7772 ----
*** 8677,8699 ****
assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
"CMS thread should hold CMS token");
_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);
_freelistLock->lock();
_bitMap->lock()->lock_without_safepoint_check();
--- 8430,8449 ----
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