ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure) :
_threads(NULL), _n_threads(0),
_hot_card_cache(g1h)
{
// Ergomonically select initial concurrent refinement parameters
if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1));
}
set_green_zone(G1ConcRefinementGreenZone);
if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3);
}
set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone()));
if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2);
}
set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone()));
_n_worker_threads = thread_num();
// We need one extra thread to do the young gen rset size sampling.
_n_threads = _n_worker_threads + 1;
reset_threshold_step();
_threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC);
uint worker_id_offset = DirtyCardQueueSet::num_par_ids();
ConcurrentG1RefineThread *next = NULL;
for (uint i = _n_threads - 1; i != UINT_MAX; i--) {
ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, refine_closure, worker_id_offset, i);
assert(t != NULL, "Conc refine should have been created");
if (t->osthread() == NULL) {
vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
}
assert(t->cg1r() == this, "Conc refine thread should refer to this");
_threads[i] = t;
next = t;
}
}
virtual void do_thread(Thread* t) {
ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t;
_summary->set_rs_thread_vtime(_counter, crt->vtime_accum());
_counter++;
}
ConcurrentG1Refine* ConcurrentG1Refine::create(CardTableEntryClosure* refine_closure,
jint* ecode) {
size_t min_yellow_zone_size = calc_min_yellow_zone_size();
size_t green_zone = calc_init_green_zone();
size_t yellow_zone = calc_init_yellow_zone(green_zone, min_yellow_zone_size);
size_t red_zone = calc_init_red_zone(green_zone, yellow_zone);
LOG_ZONES("Initial Refinement Zones: "
"green: " SIZE_FORMAT ", "
"yellow: " SIZE_FORMAT ", "
"red: " SIZE_FORMAT ", "
"min yellow size: " SIZE_FORMAT,
green_zone, yellow_zone, red_zone, min_yellow_zone_size);
ConcurrentG1Refine* cg1r = new ConcurrentG1Refine(green_zone,
yellow_zone,
red_zone,
min_yellow_zone_size);
if (cg1r == NULL) {
*ecode = JNI_ENOMEM;
vm_shutdown_during_initialization("Could not create ConcurrentG1Refine");
return NULL;
}
cg1r->_threads = NEW_C_HEAP_ARRAY_RETURN_NULL(ConcurrentG1RefineThread*, cg1r->_n_worker_threads, mtGC);
if (cg1r->_threads == NULL) {
*ecode = JNI_ENOMEM;
vm_shutdown_during_initialization("Could not allocate an array for ConcurrentG1RefineThread");
return NULL;
}
uint worker_id_offset = DirtyCardQueueSet::num_par_ids();
ConcurrentG1RefineThread *next = NULL;
for (uint i = cg1r->_n_worker_threads - 1; i != UINT_MAX; i--) {
Thresholds thresholds = calc_thresholds(green_zone, yellow_zone, i);
ConcurrentG1RefineThread* t =
new ConcurrentG1RefineThread(cg1r,
next,
refine_closure,
worker_id_offset,
i,
activation_level(thresholds),
deactivation_level(thresholds));
assert(t != NULL, "Conc refine should have been created");
if (t->osthread() == NULL) {
*ecode = JNI_ENOMEM;
vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
return NULL;
}
assert(t->cg1r() == cg1r, "Conc refine thread should refer to this");
cg1r->_threads[i] = t;
next = t;
}
cg1r->_sample_thread = new G1YoungRemSetSamplingThread();
if (cg1r->_sample_thread->osthread() == NULL) {
*ecode = JNI_ENOMEM;
vm_shutdown_during_initialization("Could not create G1YoungRemSetSamplingThread");
return NULL;
}
*ecode = JNI_OK;
return cg1r;
}
virtual void do_thread(Thread *t) {
ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t;
gclog_or_tty->print(" %5.2f", crt->vtime_accum());
}
