src/share/vm/gc_implementation/parNew/parNewGeneration.cpp
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hotspot Cdiff src/share/vm/gc_implementation/parNew/parNewGeneration.cpp
src/share/vm/gc_implementation/parNew/parNewGeneration.cpp
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rev 7212 : [mq]: remove_get_gen
rev 7215 : imported patch remove_levels
rev 7216 : imported patch cleanup
*** 61,100 ****
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
#endif
ParScanThreadState::ParScanThreadState(Space* to_space_,
! ParNewGeneration* gen_,
Generation* old_gen_,
int thread_num_,
ObjToScanQueueSet* work_queue_set_,
Stack<oop, mtGC>* overflow_stacks_,
size_t desired_plab_sz_,
! ParallelTaskTerminator& term_) :
! _to_space(to_space_), _old_gen(old_gen_), _young_gen(gen_), _thread_num(thread_num_),
! _work_queue(work_queue_set_->queue(thread_num_)), _to_space_full(false),
_overflow_stack(overflow_stacks_ ? overflow_stacks_ + thread_num_ : NULL),
_ageTable(false), // false ==> not the global age table, no perf data.
_to_space_alloc_buffer(desired_plab_sz_),
! _to_space_closure(gen_, this), _old_gen_closure(gen_, this),
! _to_space_root_closure(gen_, this), _old_gen_root_closure(gen_, this),
! _older_gen_closure(gen_, this),
! _evacuate_followers(this, &_to_space_closure, &_old_gen_closure,
! &_to_space_root_closure, gen_, &_old_gen_root_closure,
! work_queue_set_, &term_),
! _is_alive_closure(gen_), _scan_weak_ref_closure(gen_, this),
_keep_alive_closure(&_scan_weak_ref_closure),
! _strong_roots_time(0.0), _term_time(0.0)
! {
#if TASKQUEUE_STATS
_term_attempts = 0;
_overflow_refills = 0;
_overflow_refill_objs = 0;
#endif // TASKQUEUE_STATS
! _survivor_chunk_array =
! (ChunkArray*) old_gen()->get_data_recorder(thread_num());
_hash_seed = 17; // Might want to take time-based random value.
_start = os::elapsedTime();
_old_gen_closure.set_generation(old_gen_);
_old_gen_root_closure.set_generation(old_gen_);
}
--- 61,111 ----
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
#endif
ParScanThreadState::ParScanThreadState(Space* to_space_,
! ParNewGeneration* young_gen_,
Generation* old_gen_,
int thread_num_,
ObjToScanQueueSet* work_queue_set_,
Stack<oop, mtGC>* overflow_stacks_,
size_t desired_plab_sz_,
! ParallelTaskTerminator& term_)
! : _to_space(to_space_),
! _old_gen(old_gen_),
! _young_gen(young_gen_),
! _thread_num(thread_num_),
! _work_queue(work_queue_set_->queue(thread_num_)),
! _to_space_full(false),
_overflow_stack(overflow_stacks_ ? overflow_stacks_ + thread_num_ : NULL),
_ageTable(false), // false ==> not the global age table, no perf data.
_to_space_alloc_buffer(desired_plab_sz_),
! _to_space_closure(young_gen_, this),
! _old_gen_closure(young_gen_, this),
! _to_space_root_closure(young_gen_, this),
! _old_gen_root_closure(young_gen_, this),
! _older_gen_closure(young_gen_, this),
! _evacuate_followers(this,
! &_to_space_closure,
! &_old_gen_closure,
! &_to_space_root_closure,
! young_gen_,
! &_old_gen_root_closure,
! work_queue_set_,
! &term_),
! _is_alive_closure(young_gen_),
! _scan_weak_ref_closure(young_gen_, this),
_keep_alive_closure(&_scan_weak_ref_closure),
! _strong_roots_time(0.0),
! _term_time(0.0) {
#if TASKQUEUE_STATS
_term_attempts = 0;
_overflow_refills = 0;
_overflow_refill_objs = 0;
#endif // TASKQUEUE_STATS
! _survivor_chunk_array = (ChunkArray*) old_gen()->get_data_recorder(thread_num());
_hash_seed = 17; // Might want to take time-based random value.
_start = os::elapsedTime();
_old_gen_closure.set_generation(old_gen_);
_old_gen_root_closure.set_generation(old_gen_);
}
*** 153,163 ****
// object is in old generation
obj->oop_iterate_range(&_old_gen_closure, start, end);
}
}
-
void ParScanThreadState::trim_queues(int max_size) {
ObjToScanQueue* queue = work_queue();
do {
while (queue->size() > (juint)max_size) {
oop obj_to_scan;
--- 164,173 ----
*** 221,239 ****
overflow_stack()->push(p);
assert(young_gen()->overflow_list() == NULL, "Error");
}
HeapWord* ParScanThreadState::alloc_in_to_space_slow(size_t word_sz) {
!
! // Otherwise, if the object is small enough, try to reallocate the
! // buffer.
HeapWord* obj = NULL;
if (!_to_space_full) {
ParGCAllocBuffer* const plab = to_space_alloc_buffer();
Space* const sp = to_space();
! if (word_sz * 100 <
! ParallelGCBufferWastePct * plab->word_sz()) {
// Is small enough; abandon this buffer and start a new one.
plab->retire(false, false);
size_t buf_size = plab->word_sz();
HeapWord* buf_space = sp->par_allocate(buf_size);
if (buf_space == NULL) {
--- 231,246 ----
overflow_stack()->push(p);
assert(young_gen()->overflow_list() == NULL, "Error");
}
HeapWord* ParScanThreadState::alloc_in_to_space_slow(size_t word_sz) {
! // If the object is small enough, try to reallocate the buffer.
HeapWord* obj = NULL;
if (!_to_space_full) {
ParGCAllocBuffer* const plab = to_space_alloc_buffer();
Space* const sp = to_space();
! if (word_sz * 100 < ParallelGCBufferWastePct * plab->word_sz()) {
// Is small enough; abandon this buffer and start a new one.
plab->retire(false, false);
size_t buf_size = plab->word_sz();
HeapWord* buf_space = sp->par_allocate(buf_size);
if (buf_space == NULL) {
*** 271,283 ****
}
}
return obj;
}
!
! void ParScanThreadState::undo_alloc_in_to_space(HeapWord* obj,
! size_t word_sz) {
// Is the alloc in the current alloc buffer?
if (to_space_alloc_buffer()->contains(obj)) {
assert(to_space_alloc_buffer()->contains(obj + word_sz - 1),
"Should contain whole object.");
to_space_alloc_buffer()->undo_allocation(obj, word_sz);
--- 278,288 ----
}
}
return obj;
}
! void ParScanThreadState::undo_alloc_in_to_space(HeapWord* obj, size_t word_sz) {
// Is the alloc in the current alloc buffer?
if (to_space_alloc_buffer()->contains(obj)) {
assert(to_space_alloc_buffer()->contains(obj + word_sz - 1),
"Should contain whole object.");
to_space_alloc_buffer()->undo_allocation(obj, word_sz);
*** 299,309 ****
ParScanThreadStateSet(int num_threads,
Space& to_space,
ParNewGeneration& gen,
Generation& old_gen,
ObjToScanQueueSet& queue_set,
! Stack<oop, mtGC>* overflow_stacks_,
size_t desired_plab_sz,
ParallelTaskTerminator& term);
~ParScanThreadStateSet() { TASKQUEUE_STATS_ONLY(reset_stats()); }
--- 304,314 ----
ParScanThreadStateSet(int num_threads,
Space& to_space,
ParNewGeneration& gen,
Generation& old_gen,
ObjToScanQueueSet& queue_set,
! Stack<oop, mtGC>* overflow_stacks,
size_t desired_plab_sz,
ParallelTaskTerminator& term);
~ParScanThreadStateSet() { TASKQUEUE_STATS_ONLY(reset_stats()); }
*** 324,348 ****
#endif // TASKQUEUE_STATS
private:
ParallelTaskTerminator& _term;
ParNewGeneration& _gen;
! Generation& _next_gen;
public:
bool is_valid(int id) const { return id < length(); }
ParallelTaskTerminator* terminator() { return &_term; }
};
!
! ParScanThreadStateSet::ParScanThreadStateSet(
! int num_threads, Space& to_space, ParNewGeneration& gen,
! Generation& old_gen, ObjToScanQueueSet& queue_set,
Stack<oop, mtGC>* overflow_stacks,
! size_t desired_plab_sz, ParallelTaskTerminator& term)
: ResourceArray(sizeof(ParScanThreadState), num_threads),
! _gen(gen), _next_gen(old_gen), _term(term)
! {
assert(num_threads > 0, "sanity check!");
assert(ParGCUseLocalOverflow == (overflow_stacks != NULL),
"overflow_stack allocation mismatch");
// Initialize states.
for (int i = 0; i < num_threads; ++i) {
--- 329,356 ----
#endif // TASKQUEUE_STATS
private:
ParallelTaskTerminator& _term;
ParNewGeneration& _gen;
! Generation& _old_gen;
public:
bool is_valid(int id) const { return id < length(); }
ParallelTaskTerminator* terminator() { return &_term; }
};
! ParScanThreadStateSet::ParScanThreadStateSet(int num_threads,
! Space& to_space,
! ParNewGeneration& gen,
! Generation& old_gen,
! ObjToScanQueueSet& queue_set,
Stack<oop, mtGC>* overflow_stacks,
! size_t desired_plab_sz,
! ParallelTaskTerminator& term)
: ResourceArray(sizeof(ParScanThreadState), num_threads),
! _gen(gen),
! _old_gen(old_gen),
! _term(term) {
assert(num_threads > 0, "sanity check!");
assert(ParGCUseLocalOverflow == (overflow_stacks != NULL),
"overflow_stack allocation mismatch");
// Initialize states.
for (int i = 0; i < num_threads; ++i) {
*** 350,361 ****
ParScanThreadState(&to_space, &gen, &old_gen, i, &queue_set,
overflow_stacks, desired_plab_sz, term);
}
}
! inline ParScanThreadState& ParScanThreadStateSet::thread_state(int i)
! {
assert(i >= 0 && i < length(), "sanity check!");
return ((ParScanThreadState*)_data)[i];
}
void ParScanThreadStateSet::trace_promotion_failed(YoungGCTracer& gc_tracer) {
--- 358,368 ----
ParScanThreadState(&to_space, &gen, &old_gen, i, &queue_set,
overflow_stacks, desired_plab_sz, term);
}
}
! inline ParScanThreadState& ParScanThreadStateSet::thread_state(int i) {
assert(i >= 0 && i < length(), "sanity check!");
return ((ParScanThreadState*)_data)[i];
}
void ParScanThreadStateSet::trace_promotion_failed(YoungGCTracer& gc_tracer) {
*** 365,415 ****
thread_state(i).promotion_failed_info().reset();
}
}
}
! void ParScanThreadStateSet::reset(int active_threads, bool promotion_failed)
! {
_term.reset_for_reuse(active_threads);
if (promotion_failed) {
for (int i = 0; i < length(); ++i) {
thread_state(i).print_promotion_failure_size();
}
}
}
#if TASKQUEUE_STATS
void
! ParScanThreadState::reset_stats()
! {
taskqueue_stats().reset();
_term_attempts = 0;
_overflow_refills = 0;
_overflow_refill_objs = 0;
}
! void ParScanThreadStateSet::reset_stats()
! {
for (int i = 0; i < length(); ++i) {
thread_state(i).reset_stats();
}
}
! void
! ParScanThreadStateSet::print_termination_stats_hdr(outputStream* const st)
! {
st->print_raw_cr("GC Termination Stats");
st->print_raw_cr(" elapsed --strong roots-- "
"-------termination-------");
st->print_raw_cr("thr ms ms % "
" ms % attempts");
st->print_raw_cr("--- --------- --------- ------ "
"--------- ------ --------");
}
! void ParScanThreadStateSet::print_termination_stats(outputStream* const st)
! {
print_termination_stats_hdr(st);
for (int i = 0; i < length(); ++i) {
const ParScanThreadState & pss = thread_state(i);
const double elapsed_ms = pss.elapsed_time() * 1000.0;
--- 372,416 ----
thread_state(i).promotion_failed_info().reset();
}
}
}
! void ParScanThreadStateSet::reset(int active_threads, bool promotion_failed) {
_term.reset_for_reuse(active_threads);
if (promotion_failed) {
for (int i = 0; i < length(); ++i) {
thread_state(i).print_promotion_failure_size();
}
}
}
#if TASKQUEUE_STATS
void
! ParScanThreadState::reset_stats() {
taskqueue_stats().reset();
_term_attempts = 0;
_overflow_refills = 0;
_overflow_refill_objs = 0;
}
! void ParScanThreadStateSet::reset_stats() {
for (int i = 0; i < length(); ++i) {
thread_state(i).reset_stats();
}
}
! void ParScanThreadStateSet::print_termination_stats_hdr(outputStream* const st) {
st->print_raw_cr("GC Termination Stats");
st->print_raw_cr(" elapsed --strong roots-- "
"-------termination-------");
st->print_raw_cr("thr ms ms % "
" ms % attempts");
st->print_raw_cr("--- --------- --------- ------ "
"--------- ------ --------");
}
! void ParScanThreadStateSet::print_termination_stats(outputStream* const st) {
print_termination_stats_hdr(st);
for (int i = 0; i < length(); ++i) {
const ParScanThreadState & pss = thread_state(i);
const double elapsed_ms = pss.elapsed_time() * 1000.0;
*** 421,439 ****
term_ms, term_ms * 100 / elapsed_ms, pss.term_attempts());
}
}
// Print stats related to work queue activity.
! void ParScanThreadStateSet::print_taskqueue_stats_hdr(outputStream* const st)
! {
st->print_raw_cr("GC Task Stats");
st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr();
st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr();
}
! void ParScanThreadStateSet::print_taskqueue_stats(outputStream* const st)
! {
print_taskqueue_stats_hdr(st);
TaskQueueStats totals;
for (int i = 0; i < length(); ++i) {
const ParScanThreadState & pss = thread_state(i);
--- 422,438 ----
term_ms, term_ms * 100 / elapsed_ms, pss.term_attempts());
}
}
// Print stats related to work queue activity.
! void ParScanThreadStateSet::print_taskqueue_stats_hdr(outputStream* const st) {
st->print_raw_cr("GC Task Stats");
st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr();
st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr();
}
! void ParScanThreadStateSet::print_taskqueue_stats(outputStream* const st) {
print_taskqueue_stats_hdr(st);
TaskQueueStats totals;
for (int i = 0; i < length(); ++i) {
const ParScanThreadState & pss = thread_state(i);
*** 451,462 ****
DEBUG_ONLY(totals.verify());
}
#endif // TASKQUEUE_STATS
! void ParScanThreadStateSet::flush()
! {
// Work in this loop should be kept as lightweight as
// possible since this might otherwise become a bottleneck
// to scaling. Should we add heavy-weight work into this
// loop, consider parallelizing the loop into the worker threads.
for (int i = 0; i < length(); ++i) {
--- 450,460 ----
DEBUG_ONLY(totals.verify());
}
#endif // TASKQUEUE_STATS
! void ParScanThreadStateSet::flush() {
// Work in this loop should be kept as lightweight as
// possible since this might otherwise become a bottleneck
// to scaling. Should we add heavy-weight work into this
// loop, consider parallelizing the loop into the worker threads.
for (int i = 0; i < length(); ++i) {
*** 473,484 ****
// them all into one.
ageTable *local_table = par_scan_state.age_table();
_gen.age_table()->merge(local_table);
// Inform old gen that we're done.
! _next_gen.par_promote_alloc_done(i);
! _next_gen.par_oop_since_save_marks_iterate_done(i);
}
if (UseConcMarkSweepGC && ParallelGCThreads > 0) {
// We need to call this even when ResizeOldPLAB is disabled
// so as to avoid breaking some asserts. While we may be able
--- 471,482 ----
// them all into one.
ageTable *local_table = par_scan_state.age_table();
_gen.age_table()->merge(local_table);
// Inform old gen that we're done.
! _old_gen.par_promote_alloc_done(i);
! _old_gen.par_oop_since_save_marks_iterate_done(i);
}
if (UseConcMarkSweepGC && ParallelGCThreads > 0) {
// We need to call this even when ResizeOldPLAB is disabled
// so as to avoid breaking some asserts. While we may be able
*** 488,501 ****
CFLS_LAB::compute_desired_plab_size();
}
}
ParScanClosure::ParScanClosure(ParNewGeneration* g,
! ParScanThreadState* par_scan_state) :
! OopsInKlassOrGenClosure(g), _par_scan_state(par_scan_state), _g(g)
! {
! assert(_g->level() == 0, "Optimized for youngest generation");
_boundary = _g->reserved().end();
}
void ParScanWithBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, false); }
void ParScanWithBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); }
--- 486,499 ----
CFLS_LAB::compute_desired_plab_size();
}
}
ParScanClosure::ParScanClosure(ParNewGeneration* g,
! ParScanThreadState* par_scan_state)
! : OopsInKlassOrGenClosure(g),
! _par_scan_state(par_scan_state),
! _g(g) {
_boundary = _g->reserved().end();
}
void ParScanWithBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, false); }
void ParScanWithBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); }
*** 509,553 ****
void ParRootScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, true); }
void ParRootScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, true); }
ParScanWeakRefClosure::ParScanWeakRefClosure(ParNewGeneration* g,
ParScanThreadState* par_scan_state)
! : ScanWeakRefClosure(g), _par_scan_state(par_scan_state)
! {}
void ParScanWeakRefClosure::do_oop(oop* p) { ParScanWeakRefClosure::do_oop_work(p); }
void ParScanWeakRefClosure::do_oop(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); }
#ifdef WIN32
#pragma warning(disable: 4786) /* identifier was truncated to '255' characters in the browser information */
#endif
! ParEvacuateFollowersClosure::ParEvacuateFollowersClosure(
! ParScanThreadState* par_scan_state_,
! ParScanWithoutBarrierClosure* to_space_closure_,
! ParScanWithBarrierClosure* old_gen_closure_,
! ParRootScanWithoutBarrierClosure* to_space_root_closure_,
! ParNewGeneration* par_gen_,
! ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure_,
! ObjToScanQueueSet* task_queues_,
! ParallelTaskTerminator* terminator_) :
!
! _par_scan_state(par_scan_state_),
! _to_space_closure(to_space_closure_),
! _old_gen_closure(old_gen_closure_),
! _to_space_root_closure(to_space_root_closure_),
! _old_gen_root_closure(old_gen_root_closure_),
! _par_gen(par_gen_),
! _task_queues(task_queues_),
! _terminator(terminator_)
! {}
void ParEvacuateFollowersClosure::do_void() {
ObjToScanQueue* work_q = par_scan_state()->work_queue();
while (true) {
-
// Scan to-space and old-gen objs until we run out of both.
oop obj_to_scan;
par_scan_state()->trim_queues(0);
// We have no local work, attempt to steal from other threads.
--- 507,549 ----
void ParRootScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, true); }
void ParRootScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, true); }
ParScanWeakRefClosure::ParScanWeakRefClosure(ParNewGeneration* g,
ParScanThreadState* par_scan_state)
! : ScanWeakRefClosure(g),
! _par_scan_state(par_scan_state) {
! }
void ParScanWeakRefClosure::do_oop(oop* p) { ParScanWeakRefClosure::do_oop_work(p); }
void ParScanWeakRefClosure::do_oop(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); }
#ifdef WIN32
#pragma warning(disable: 4786) /* identifier was truncated to '255' characters in the browser information */
#endif
! ParEvacuateFollowersClosure::ParEvacuateFollowersClosure(ParScanThreadState* par_scan_state,
! ParScanWithoutBarrierClosure* to_space_closure,
! ParScanWithBarrierClosure* old_gen_closure,
! ParRootScanWithoutBarrierClosure* to_space_root_closure,
! ParNewGeneration* par_gen,
! ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure,
! ObjToScanQueueSet* task_queues,
! ParallelTaskTerminator* terminator)
! : _par_scan_state(par_scan_state),
! _to_space_closure(to_space_closure),
! _old_gen_closure(old_gen_closure),
! _to_space_root_closure(to_space_root_closure),
! _old_gen_root_closure(old_gen_root_closure),
! _par_gen(par_gen),
! _task_queues(task_queues),
! _terminator(terminator) {
! }
void ParEvacuateFollowersClosure::do_void() {
ObjToScanQueue* work_q = par_scan_state()->work_queue();
while (true) {
// Scan to-space and old-gen objs until we run out of both.
oop obj_to_scan;
par_scan_state()->trim_queues(0);
// We have no local work, attempt to steal from other threads.
*** 576,597 ****
"Broken overflow list?");
// Finish the last termination pause.
par_scan_state()->end_term_time();
}
! ParNewGenTask::ParNewGenTask(ParNewGeneration* gen, Generation* next_gen,
! HeapWord* young_old_boundary, ParScanThreadStateSet* state_set) :
! AbstractGangTask("ParNewGeneration collection"),
! _gen(gen), _next_gen(next_gen),
_young_old_boundary(young_old_boundary),
! _state_set(state_set)
! {}
// Reset the terminator for the given number of
// active threads.
void ParNewGenTask::set_for_termination(int active_workers) {
! _state_set->reset(active_workers, _gen->promotion_failed());
// Should the heap be passed in? There's only 1 for now so
// grab it instead.
GenCollectedHeap* gch = GenCollectedHeap::heap();
gch->set_n_termination(active_workers);
}
--- 572,595 ----
"Broken overflow list?");
// Finish the last termination pause.
par_scan_state()->end_term_time();
}
! ParNewGenTask::ParNewGenTask(ParNewGeneration* young_gen,
! Generation* old_gen,
! HeapWord* young_old_boundary,
! ParScanThreadStateSet* state_set)
! : AbstractGangTask("ParNewGeneration collection"),
! _young_gen(young_gen), _old_gen(old_gen),
_young_old_boundary(young_old_boundary),
! _state_set(state_set) {
! }
// Reset the terminator for the given number of
// active threads.
void ParNewGenTask::set_for_termination(int active_workers) {
! _state_set->reset(active_workers, _young_gen->promotion_failed());
// Should the heap be passed in? There's only 1 for now so
// grab it instead.
GenCollectedHeap* gch = GenCollectedHeap::heap();
gch->set_n_termination(active_workers);
}
*** 600,613 ****
GenCollectedHeap* gch = GenCollectedHeap::heap();
// Since this is being done in a separate thread, need new resource
// and handle marks.
ResourceMark rm;
HandleMark hm;
- // We would need multiple old-gen queues otherwise.
- assert(gch->n_gens() == 2, "Par young collection currently only works with one older gen.");
! Generation* old_gen = gch->next_gen(_gen);
ParScanThreadState& par_scan_state = _state_set->thread_state(worker_id);
assert(_state_set->is_valid(worker_id), "Should not have been called");
par_scan_state.set_young_old_boundary(_young_old_boundary);
--- 598,609 ----
GenCollectedHeap* gch = GenCollectedHeap::heap();
// Since this is being done in a separate thread, need new resource
// and handle marks.
ResourceMark rm;
HandleMark hm;
! Generation* old_gen = gch->old_gen();
ParScanThreadState& par_scan_state = _state_set->thread_state(worker_id);
assert(_state_set->is_valid(worker_id), "Should not have been called");
par_scan_state.set_young_old_boundary(_young_old_boundary);
*** 617,627 ****
CLDToKlassAndOopClosure cld_scan_closure(&klass_scan_closure,
&par_scan_state.to_space_root_closure(),
false);
par_scan_state.start_strong_roots();
! gch->gen_process_roots(_gen->level(),
true, // Process younger gens, if any,
// as strong roots.
false, // no scope; this is parallel code
SharedHeap::SO_ScavengeCodeCache,
GenCollectedHeap::StrongAndWeakRoots,
--- 613,623 ----
CLDToKlassAndOopClosure cld_scan_closure(&klass_scan_closure,
&par_scan_state.to_space_root_closure(),
false);
par_scan_state.start_strong_roots();
! gch->gen_process_roots(Generation::Young,
true, // Process younger gens, if any,
// as strong roots.
false, // no scope; this is parallel code
SharedHeap::SO_ScavengeCodeCache,
GenCollectedHeap::StrongAndWeakRoots,
*** 638,653 ****
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
#endif
ParNewGeneration::
! ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level)
! : DefNewGeneration(rs, initial_byte_size, level, "PCopy"),
_overflow_list(NULL),
_is_alive_closure(this),
! _plab_stats(YoungPLABSize, PLABWeight)
! {
NOT_PRODUCT(_overflow_counter = ParGCWorkQueueOverflowInterval;)
NOT_PRODUCT(_num_par_pushes = 0;)
_task_queues = new ObjToScanQueueSet(ParallelGCThreads);
guarantee(_task_queues != NULL, "task_queues allocation failure.");
--- 634,648 ----
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
#endif
ParNewGeneration::
! ParNewGeneration(ReservedSpace rs, size_t initial_byte_size)
! : DefNewGeneration(rs, initial_byte_size, "PCopy"),
_overflow_list(NULL),
_is_alive_closure(this),
! _plab_stats(YoungPLABSize, PLABWeight) {
NOT_PRODUCT(_overflow_counter = ParGCWorkQueueOverflowInterval;)
NOT_PRODUCT(_num_par_pushes = 0;)
_task_queues = new ObjToScanQueueSet(ParallelGCThreads);
guarantee(_task_queues != NULL, "task_queues allocation failure.");
*** 655,670 ****
ObjToScanQueue *q = new ObjToScanQueue();
guarantee(q != NULL, "work_queue Allocation failure.");
_task_queues->register_queue(i1, q);
}
! for (uint i2 = 0; i2 < ParallelGCThreads; i2++)
_task_queues->queue(i2)->initialize();
_overflow_stacks = NULL;
if (ParGCUseLocalOverflow) {
-
// typedef to workaround NEW_C_HEAP_ARRAY macro, which can not deal
// with ','
typedef Stack<oop, mtGC> GCOopStack;
_overflow_stacks = NEW_C_HEAP_ARRAY(GCOopStack, ParallelGCThreads, mtGC);
--- 650,665 ----
ObjToScanQueue *q = new ObjToScanQueue();
guarantee(q != NULL, "work_queue Allocation failure.");
_task_queues->register_queue(i1, q);
}
! for (uint i2 = 0; i2 < ParallelGCThreads; i2++) {
_task_queues->queue(i2)->initialize();
+ }
_overflow_stacks = NULL;
if (ParGCUseLocalOverflow) {
// typedef to workaround NEW_C_HEAP_ARRAY macro, which can not deal
// with ','
typedef Stack<oop, mtGC> GCOopStack;
_overflow_stacks = NEW_C_HEAP_ARRAY(GCOopStack, ParallelGCThreads, mtGC);
*** 686,697 ****
#ifdef _MSC_VER
#pragma warning( pop )
#endif
// ParNewGeneration::
! ParKeepAliveClosure::ParKeepAliveClosure(ParScanWeakRefClosure* cl) :
! DefNewGeneration::KeepAliveClosure(cl), _par_cl(cl) {}
template <class T>
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop_work(T* p) {
#ifdef ASSERT
{
--- 681,693 ----
#ifdef _MSC_VER
#pragma warning( pop )
#endif
// ParNewGeneration::
! ParKeepAliveClosure::ParKeepAliveClosure(ParScanWeakRefClosure* cl)
! : DefNewGeneration::KeepAliveClosure(cl), _par_cl(cl) {
! }
template <class T>
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop_work(T* p) {
#ifdef ASSERT
{
*** 713,724 ****
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(oop* p) { ParKeepAliveClosure::do_oop_work(p); }
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(narrowOop* p) { ParKeepAliveClosure::do_oop_work(p); }
// ParNewGeneration::
! KeepAliveClosure::KeepAliveClosure(ScanWeakRefClosure* cl) :
! DefNewGeneration::KeepAliveClosure(cl) {}
template <class T>
void /*ParNewGeneration::*/KeepAliveClosure::do_oop_work(T* p) {
#ifdef ASSERT
{
--- 709,721 ----
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(oop* p) { ParKeepAliveClosure::do_oop_work(p); }
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(narrowOop* p) { ParKeepAliveClosure::do_oop_work(p); }
// ParNewGeneration::
! KeepAliveClosure::KeepAliveClosure(ScanWeakRefClosure* cl)
! : DefNewGeneration::KeepAliveClosure(cl) {
! }
template <class T>
void /*ParNewGeneration::*/KeepAliveClosure::do_oop_work(T* p) {
#ifdef ASSERT
{
*** 766,808 ****
class ParNewRefProcTaskProxy: public AbstractGangTask {
typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask;
public:
ParNewRefProcTaskProxy(ProcessTask& task, ParNewGeneration& gen,
! Generation& next_gen,
HeapWord* young_old_boundary,
ParScanThreadStateSet& state_set);
private:
virtual void work(uint worker_id);
virtual void set_for_termination(int active_workers) {
_state_set.terminator()->reset_for_reuse(active_workers);
}
private:
! ParNewGeneration& _gen;
ProcessTask& _task;
! Generation& _next_gen;
HeapWord* _young_old_boundary;
ParScanThreadStateSet& _state_set;
};
! ParNewRefProcTaskProxy::ParNewRefProcTaskProxy(
! ProcessTask& task, ParNewGeneration& gen,
! Generation& next_gen,
HeapWord* young_old_boundary,
ParScanThreadStateSet& state_set)
: AbstractGangTask("ParNewGeneration parallel reference processing"),
! _gen(gen),
_task(task),
! _next_gen(next_gen),
_young_old_boundary(young_old_boundary),
! _state_set(state_set)
! {
}
! void ParNewRefProcTaskProxy::work(uint worker_id)
! {
ResourceMark rm;
HandleMark hm;
ParScanThreadState& par_scan_state = _state_set.thread_state(worker_id);
par_scan_state.set_young_old_boundary(_young_old_boundary);
_task.work(worker_id, par_scan_state.is_alive_closure(),
--- 763,803 ----
class ParNewRefProcTaskProxy: public AbstractGangTask {
typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask;
public:
ParNewRefProcTaskProxy(ProcessTask& task, ParNewGeneration& gen,
! Generation& old_gen,
HeapWord* young_old_boundary,
ParScanThreadStateSet& state_set);
private:
virtual void work(uint worker_id);
virtual void set_for_termination(int active_workers) {
_state_set.terminator()->reset_for_reuse(active_workers);
}
private:
! ParNewGeneration& _young_gen;
ProcessTask& _task;
! Generation& _old_gen;
HeapWord* _young_old_boundary;
ParScanThreadStateSet& _state_set;
};
! ParNewRefProcTaskProxy::ParNewRefProcTaskProxy(ProcessTask& task,
! ParNewGeneration& young_gen,
! Generation& old_gen,
HeapWord* young_old_boundary,
ParScanThreadStateSet& state_set)
: AbstractGangTask("ParNewGeneration parallel reference processing"),
! _young_gen(young_gen),
_task(task),
! _old_gen(old_gen),
_young_old_boundary(young_old_boundary),
! _state_set(state_set) {
}
! void ParNewRefProcTaskProxy::work(uint worker_id) {
ResourceMark rm;
HandleMark hm;
ParScanThreadState& par_scan_state = _state_set.thread_state(worker_id);
par_scan_state.set_young_old_boundary(_young_old_boundary);
_task.work(worker_id, par_scan_state.is_alive_closure(),
*** 815,894 ****
EnqueueTask& _task;
public:
ParNewRefEnqueueTaskProxy(EnqueueTask& task)
: AbstractGangTask("ParNewGeneration parallel reference enqueue"),
! _task(task)
! { }
! virtual void work(uint worker_id)
! {
_task.work(worker_id);
}
};
!
! void ParNewRefProcTaskExecutor::execute(ProcessTask& task)
! {
GenCollectedHeap* gch = GenCollectedHeap::heap();
assert(gch->kind() == CollectedHeap::GenCollectedHeap,
"not a generational heap");
FlexibleWorkGang* workers = gch->workers();
assert(workers != NULL, "Need parallel worker threads.");
_state_set.reset(workers->active_workers(), _generation.promotion_failed());
! ParNewRefProcTaskProxy rp_task(task, _generation, *_generation.next_gen(),
_generation.reserved().end(), _state_set);
workers->run_task(&rp_task);
_state_set.reset(0 /* bad value in debug if not reset */,
_generation.promotion_failed());
}
! void ParNewRefProcTaskExecutor::execute(EnqueueTask& task)
! {
GenCollectedHeap* gch = GenCollectedHeap::heap();
FlexibleWorkGang* workers = gch->workers();
assert(workers != NULL, "Need parallel worker threads.");
ParNewRefEnqueueTaskProxy enq_task(task);
workers->run_task(&enq_task);
}
! void ParNewRefProcTaskExecutor::set_single_threaded_mode()
! {
_state_set.flush();
GenCollectedHeap* gch = GenCollectedHeap::heap();
gch->set_par_threads(0); // 0 ==> non-parallel.
gch->save_marks();
}
! ScanClosureWithParBarrier::
! ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier) :
! ScanClosure(g, gc_barrier) {}
EvacuateFollowersClosureGeneral::
! EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level,
OopsInGenClosure* cur,
! OopsInGenClosure* older) :
! _gch(gch), _level(level),
! _scan_cur_or_nonheap(cur), _scan_older(older)
! {}
void EvacuateFollowersClosureGeneral::do_void() {
do {
// Beware: this call will lead to closure applications via virtual
// calls.
! _gch->oop_since_save_marks_iterate(_level,
_scan_cur_or_nonheap,
_scan_older);
! } while (!_gch->no_allocs_since_save_marks(_level));
}
// A Generation that does parallel young-gen collection.
bool ParNewGeneration::_avoid_promotion_undo = false;
! void ParNewGeneration::handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set, ParNewTracer& gc_tracer) {
assert(_promo_failure_scan_stack.is_empty(), "post condition");
_promo_failure_scan_stack.clear(true); // Clear cached segments.
remove_forwarding_pointers();
if (PrintGCDetails) {
--- 810,888 ----
EnqueueTask& _task;
public:
ParNewRefEnqueueTaskProxy(EnqueueTask& task)
: AbstractGangTask("ParNewGeneration parallel reference enqueue"),
! _task(task) {
! }
! virtual void work(uint worker_id) {
_task.work(worker_id);
}
};
! void ParNewRefProcTaskExecutor::execute(ProcessTask& task) {
GenCollectedHeap* gch = GenCollectedHeap::heap();
assert(gch->kind() == CollectedHeap::GenCollectedHeap,
"not a generational heap");
FlexibleWorkGang* workers = gch->workers();
assert(workers != NULL, "Need parallel worker threads.");
_state_set.reset(workers->active_workers(), _generation.promotion_failed());
! ParNewRefProcTaskProxy rp_task(task, _generation, *(gch->old_gen()),
_generation.reserved().end(), _state_set);
workers->run_task(&rp_task);
_state_set.reset(0 /* bad value in debug if not reset */,
_generation.promotion_failed());
}
! void ParNewRefProcTaskExecutor::execute(EnqueueTask& task) {
GenCollectedHeap* gch = GenCollectedHeap::heap();
FlexibleWorkGang* workers = gch->workers();
assert(workers != NULL, "Need parallel worker threads.");
ParNewRefEnqueueTaskProxy enq_task(task);
workers->run_task(&enq_task);
}
! void ParNewRefProcTaskExecutor::set_single_threaded_mode() {
_state_set.flush();
GenCollectedHeap* gch = GenCollectedHeap::heap();
gch->set_par_threads(0); // 0 ==> non-parallel.
gch->save_marks();
}
! ScanClosureWithParBarrier::ScanClosureWithParBarrier(ParNewGeneration* g,
! bool gc_barrier)
! : ScanClosure(g, gc_barrier) {
! }
EvacuateFollowersClosureGeneral::
! EvacuateFollowersClosureGeneral(GenCollectedHeap* gch,
OopsInGenClosure* cur,
! OopsInGenClosure* older)
! : _gch(gch),
! _scan_cur_or_nonheap(cur),
! _scan_older(older) {
! }
void EvacuateFollowersClosureGeneral::do_void() {
do {
// Beware: this call will lead to closure applications via virtual
// calls.
! _gch->oop_since_save_marks_iterate(Generation::Young,
_scan_cur_or_nonheap,
_scan_older);
! } while (!_gch->no_allocs_since_save_marks(true /* include_young */));
}
// A Generation that does parallel young-gen collection.
bool ParNewGeneration::_avoid_promotion_undo = false;
! void ParNewGeneration::handle_promotion_failed(GenCollectedHeap* gch,
! ParScanThreadStateSet& thread_state_set,
! ParNewTracer& gc_tracer) {
assert(_promo_failure_scan_stack.is_empty(), "post condition");
_promo_failure_scan_stack.clear(true); // Clear cached segments.
remove_forwarding_pointers();
if (PrintGCDetails) {
*** 897,907 ****
// All the spaces are in play for mark-sweep.
swap_spaces(); // Make life simpler for CMS || rescan; see 6483690.
from()->set_next_compaction_space(to());
gch->set_incremental_collection_failed();
// Inform the next generation that a promotion failure occurred.
! _next_gen->promotion_failure_occurred();
// Trace promotion failure in the parallel GC threads
thread_state_set.trace_promotion_failed(gc_tracer);
// Single threaded code may have reported promotion failure to the global state
if (_promotion_failed_info.has_failed()) {
--- 891,901 ----
// All the spaces are in play for mark-sweep.
swap_spaces(); // Make life simpler for CMS || rescan; see 6483690.
from()->set_next_compaction_space(to());
gch->set_incremental_collection_failed();
// Inform the next generation that a promotion failure occurred.
! _old_gen->promotion_failure_occurred();
// Trace promotion failure in the parallel GC threads
thread_state_set.trace_promotion_failed(gc_tracer);
// Single threaded code may have reported promotion failure to the global state
if (_promotion_failed_info.has_failed()) {
*** 929,941 ****
int active_workers =
AdaptiveSizePolicy::calc_active_workers(workers->total_workers(),
workers->active_workers(),
Threads::number_of_non_daemon_threads());
workers->set_active_workers(active_workers);
! assert(gch->n_gens() == 2,
! "Par collection currently only works with single older gen.");
! _next_gen = gch->next_gen(this);
// Do we have to avoid promotion_undo?
if (gch->collector_policy()->is_concurrent_mark_sweep_policy()) {
set_avoid_promotion_undo(true);
}
--- 923,933 ----
int active_workers =
AdaptiveSizePolicy::calc_active_workers(workers->total_workers(),
workers->active_workers(),
Threads::number_of_non_daemon_threads());
workers->set_active_workers(active_workers);
! _old_gen = gch->old_gen();
// Do we have to avoid promotion_undo?
if (gch->collector_policy()->is_concurrent_mark_sweep_policy()) {
set_avoid_promotion_undo(true);
}
*** 977,990 ****
// Always set the terminator for the active number of workers
// because only those workers go through the termination protocol.
ParallelTaskTerminator _term(n_workers, task_queues());
ParScanThreadStateSet thread_state_set(workers->active_workers(),
! *to(), *this, *_next_gen, *task_queues(),
_overflow_stacks, desired_plab_sz(), _term);
! ParNewGenTask tsk(this, _next_gen, reserved().end(), &thread_state_set);
gch->set_par_threads(n_workers);
gch->rem_set()->prepare_for_younger_refs_iterate(true);
// It turns out that even when we're using 1 thread, doing the work in a
// separate thread causes wide variance in run times. We can't help this
// in the multi-threaded case, but we special-case n=1 here to get
--- 969,982 ----
// Always set the terminator for the active number of workers
// because only those workers go through the termination protocol.
ParallelTaskTerminator _term(n_workers, task_queues());
ParScanThreadStateSet thread_state_set(workers->active_workers(),
! *to(), *this, *_old_gen, *task_queues(),
_overflow_stacks, desired_plab_sz(), _term);
! ParNewGenTask tsk(this, _old_gen, reserved().end(), &thread_state_set);
gch->set_par_threads(n_workers);
gch->rem_set()->prepare_for_younger_refs_iterate(true);
// It turns out that even when we're using 1 thread, doing the work in a
// separate thread causes wide variance in run times. We can't help this
// in the multi-threaded case, but we special-case n=1 here to get
*** 1005,1015 ****
ScanWeakRefClosure scan_weak_ref(this);
KeepAliveClosure keep_alive(&scan_weak_ref);
ScanClosure scan_without_gc_barrier(this, false);
ScanClosureWithParBarrier scan_with_gc_barrier(this, true);
set_promo_failure_scan_stack_closure(&scan_without_gc_barrier);
! EvacuateFollowersClosureGeneral evacuate_followers(gch, _level,
&scan_without_gc_barrier, &scan_with_gc_barrier);
rp->setup_policy(clear_all_soft_refs);
// Can the mt_degree be set later (at run_task() time would be best)?
rp->set_active_mt_degree(active_workers);
ReferenceProcessorStats stats;
--- 997,1007 ----
ScanWeakRefClosure scan_weak_ref(this);
KeepAliveClosure keep_alive(&scan_weak_ref);
ScanClosure scan_without_gc_barrier(this, false);
ScanClosureWithParBarrier scan_with_gc_barrier(this, true);
set_promo_failure_scan_stack_closure(&scan_without_gc_barrier);
! EvacuateFollowersClosureGeneral evacuate_followers(gch,
&scan_without_gc_barrier, &scan_with_gc_barrier);
rp->setup_policy(clear_all_soft_refs);
// Can the mt_degree be set later (at run_task() time would be best)?
rp->set_active_mt_degree(active_workers);
ReferenceProcessorStats stats;
*** 1194,1205 ****
if (forward_ptr != NULL) {
// someone else beat us to it.
return real_forwardee(old);
}
! new_obj = _next_gen->par_promote(par_scan_state->thread_num(),
! old, m, sz);
if (new_obj == NULL) {
// promotion failed, forward to self
_promotion_failed = true;
new_obj = old;
--- 1186,1196 ----
if (forward_ptr != NULL) {
// someone else beat us to it.
return real_forwardee(old);
}
! new_obj = _old_gen->par_promote(par_scan_state->thread_num(), old, m, sz);
if (new_obj == NULL) {
// promotion failed, forward to self
_promotion_failed = true;
new_obj = old;
*** 1226,1236 ****
// This code must come after the CAS test, or it will print incorrect
// information.
if (TraceScavenge) {
gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
is_in_reserved(new_obj) ? "copying" : "tenuring",
! new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size());
}
#endif
if (forward_ptr == NULL) {
oop obj_to_push = new_obj;
--- 1217,1230 ----
// This code must come after the CAS test, or it will print incorrect
// information.
if (TraceScavenge) {
gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
is_in_reserved(new_obj) ? "copying" : "tenuring",
! new_obj->klass()->internal_name(),
! (void *)old,
! (void *)new_obj,
! new_obj->size());
}
#endif
if (forward_ptr == NULL) {
oop obj_to_push = new_obj;
*** 1312,1322 ****
}
if (new_obj == NULL) {
// Either to-space is full or we decided to promote
// try allocating obj tenured
! new_obj = _next_gen->par_promote(par_scan_state->thread_num(),
old, m, sz);
if (new_obj == NULL) {
// promotion failed, forward to self
forward_ptr = old->forward_to_atomic(old);
--- 1306,1316 ----
}
if (new_obj == NULL) {
// Either to-space is full or we decided to promote
// try allocating obj tenured
! new_obj = _old_gen->par_promote(par_scan_state->thread_num(),
old, m, sz);
if (new_obj == NULL) {
// promotion failed, forward to self
forward_ptr = old->forward_to_atomic(old);
*** 1347,1357 ****
// This code must come after the CAS test, or it will print incorrect
// information.
if (TraceScavenge) {
gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
is_in_reserved(new_obj) ? "copying" : "tenuring",
! new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size());
}
#endif
// Now attempt to install the forwarding pointer (atomically).
// We have to copy the mark word before overwriting with forwarding
--- 1341,1354 ----
// This code must come after the CAS test, or it will print incorrect
// information.
if (TraceScavenge) {
gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
is_in_reserved(new_obj) ? "copying" : "tenuring",
! new_obj->klass()->internal_name(),
! (void*)old,
! (void*)new_obj,
! new_obj->size());
}
#endif
// Now attempt to install the forwarding pointer (atomically).
// We have to copy the mark word before overwriting with forwarding
*** 1393,1403 ****
// Must be in to_space.
assert(to()->is_in_reserved(new_obj), "Checking");
par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz);
} else {
assert(!_avoid_promotion_undo, "Should not be here if avoiding.");
! _next_gen->par_promote_alloc_undo(par_scan_state->thread_num(),
(HeapWord*)new_obj, sz);
}
return forward_ptr;
}
--- 1390,1400 ----
// Must be in to_space.
assert(to()->is_in_reserved(new_obj), "Checking");
par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz);
} else {
assert(!_avoid_promotion_undo, "Should not be here if avoiding.");
! _old_gen->par_promote_alloc_undo(par_scan_state->thread_num(),
(HeapWord*)new_obj, sz);
}
return forward_ptr;
}
*** 1509,1519 ****
size_t objsFromOverflow = MIN2((size_t)(work_q->max_elems() - work_q->size())/4,
(size_t)ParGCDesiredObjsFromOverflowList);
assert(!UseCompressedOops, "Error");
assert(par_scan_state->overflow_stack() == NULL, "Error");
! if (_overflow_list == NULL) return false;
// Otherwise, there was something there; try claiming the list.
oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list));
// Trim off a prefix of at most objsFromOverflow items
Thread* tid = Thread::current();
--- 1506,1518 ----
size_t objsFromOverflow = MIN2((size_t)(work_q->max_elems() - work_q->size())/4,
(size_t)ParGCDesiredObjsFromOverflowList);
assert(!UseCompressedOops, "Error");
assert(par_scan_state->overflow_stack() == NULL, "Error");
! if (_overflow_list == NULL) {
! return false;
! }
// Otherwise, there was something there; try claiming the list.
oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list));
// Trim off a prefix of at most objsFromOverflow items
Thread* tid = Thread::current();
src/share/vm/gc_implementation/parNew/parNewGeneration.cpp
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