void ASParNewGeneration::compute_new_size() {
GenCollectedHeap* gch = GenCollectedHeap::heap();
assert(gch->kind() == CollectedHeap::GenCollectedHeap,
"not a CMS generational heap");
CMSAdaptiveSizePolicy* size_policy =
(CMSAdaptiveSizePolicy*)gch->gen_policy()->size_policy();
assert(size_policy->is_gc_cms_adaptive_size_policy(),
"Wrong type of size policy");
size_t survived = from()->used();
if (!survivor_overflow()) {
// Keep running averages on how much survived
size_policy->avg_survived()->sample(survived);
} else {
size_t promoted =
(size_t) next_gen()->gc_stats()->avg_promoted()->last_sample();
assert(promoted < gch->capacity(), "Conversion problem?");
size_t survived_guess = survived + promoted;
size_policy->avg_survived()->sample(survived_guess);
}
size_t survivor_limit = max_survivor_size();
_tenuring_threshold =
size_policy->compute_survivor_space_size_and_threshold(
_survivor_overflow,
_tenuring_threshold,
survivor_limit);
size_policy->avg_young_live()->sample(used());
size_policy->avg_eden_live()->sample(eden()->used());
size_policy->compute_young_generation_free_space(eden()->capacity(),
max_gen_size());
resize(size_policy->calculated_eden_size_in_bytes(),
size_policy->calculated_survivor_size_in_bytes());
if (UsePerfData) {
CMSGCAdaptivePolicyCounters* counters =
(CMSGCAdaptivePolicyCounters*) gch->collector_policy()->counters();
assert(counters->kind() ==
GCPolicyCounters::CMSGCAdaptivePolicyCountersKind,
"Wrong kind of counters");
counters->update_tenuring_threshold(_tenuring_threshold);
counters->update_survivor_overflowed(_survivor_overflow);
counters->update_young_capacity(capacity());
}
}
// Changes from PSYoungGen version
// value of "alignment"
void ASParNewGeneration::space_invariants() {
const size_t alignment = os::vm_page_size();
// Currently, our eden size cannot shrink to zero
guarantee(eden()->capacity() >= alignment, "eden too small");
guarantee(from()->capacity() >= alignment, "from too small");
guarantee(to()->capacity() >= alignment, "to too small");
// Relationship of spaces to each other
char* eden_start = (char*)eden()->bottom();
char* eden_end = (char*)eden()->end();
char* from_start = (char*)from()->bottom();
char* from_end = (char*)from()->end();
char* to_start = (char*)to()->bottom();
char* to_end = (char*)to()->end();
guarantee(eden_start >= virtual_space()->low(), "eden bottom");
guarantee(eden_start < eden_end, "eden space consistency");
guarantee(from_start < from_end, "from space consistency");
guarantee(to_start < to_end, "to space consistency");
// Check whether from space is below to space
if (from_start < to_start) {
// Eden, from, to
guarantee(eden_end <= from_start, "eden/from boundary");
guarantee(from_end <= to_start, "from/to boundary");
guarantee(to_end <= virtual_space()->high(), "to end");
} else {
// Eden, to, from
guarantee(eden_end <= to_start, "eden/to boundary");
guarantee(to_end <= from_start, "to/from boundary");
guarantee(from_end <= virtual_space()->high(), "from end");
}
// More checks that the virtual space is consistent with the spaces
assert(virtual_space()->committed_size() >=
(eden()->capacity() +
to()->capacity() +
from()->capacity()), "Committed size is inconsistent");
assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(),
"Space invariant");
char* eden_top = (char*)eden()->top();
char* from_top = (char*)from()->top();
char* to_top = (char*)to()->top();
assert(eden_top <= virtual_space()->high(), "eden top");
assert(from_top <= virtual_space()->high(), "from top");
assert(to_top <= virtual_space()->high(), "to top");
}
void DefNewGeneration::gc_epilogue(bool full) {
// Check if the heap is approaching full after a collection has
// been done. Generally the young generation is empty at
// a minimum at the end of a collection. If it is not, then
// the heap is approaching full.
GenCollectedHeap* gch = GenCollectedHeap::heap();
clear_should_allocate_from_space();
if (collection_attempt_is_safe()) {
gch->clear_incremental_collection_will_fail();
} else {
gch->set_incremental_collection_will_fail();
if (full) { // we seem to be running out of space
set_should_allocate_from_space();
}
}
if (ZapUnusedHeapArea) {
eden()->check_mangled_unused_area_complete();
from()->check_mangled_unused_area_complete();
to()->check_mangled_unused_area_complete();
}
// update the generation and space performance counters
update_counters();
gch->collector_policy()->counters()->update_counters();
}
void DefNewGeneration::space_iterate(SpaceClosure* blk,
bool usedOnly) {
blk->do_space(eden());
blk->do_space(from());
if (!usedOnly)
blk->do_space(to());
}
HeapWord* DefNewGeneration::allocate(size_t word_size,
bool is_large_noref,
bool is_tlab) {
// This is the slow-path allocation for the DefNewGeneration.
// Most allocations are fast-path in compiled code.
// We try to allocate from the eden. If that works, we are happy.
// Note that since DefNewGeneration supports lock-free allocation, we
// have to use it here, as well.
HeapWord* result = eden()->par_allocate(word_size);
if (result == NULL) {
// 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) {
eden()->set_soft_end(new_limit);
result = eden()->par_allocate(word_size);
} else {
assert(eden()->soft_end() == eden()->end(),
"invalid state after allocation_limit_reached returned 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) {
result = allocate_from_space(word_size);
}
}
void DefNewGeneration::print_on(outputStream* st) const {
Generation::print_on(st);
st->print(" eden");
eden()->print_on(st);
st->print(" from");
from()->print_on(st);
st->print(" to ");
to()->print_on(st);
}
HeapWord* DefNewGeneration::allocate(size_t word_size,
bool is_tlab) {
// This is the slow-path allocation for the DefNewGeneration.
// Most allocations are fast-path in compiled code.
// We try to allocate from the eden. If that works, we are happy.
// Note that since DefNewGeneration supports lock-free allocation, we
// have to use it here, as well.
HeapWord* result = eden()->par_allocate(word_size);
if (result != NULL) {
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) {
result = allocate_from_space(word_size);
}
return result;
}
int DefNewGeneration::addr_to_arena_id(void* addr) {
if (eden()->contains(addr)) return 0;
if (from()->contains(addr)) {
return (from()->bottom() < to()->bottom()) ? 1 : 2;
}
if (to()->contains(addr)) {
return (from()->bottom() < to()->bottom()) ? 2 : 1;
}
// Otherwise...
return -3;
}
void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size) {
// All space sizes must be multiples of car size in order for the CarTable to work.
// Note that the CarTable is used with and without train gc (for fast lookup).
uintx alignment = CarSpace::car_size();
// Compute sizes
uintx size = _virtual_space.committed_size();
uintx survivor_size = compute_survivor_size(size, alignment);
uintx eden_size = size - (2*survivor_size);
assert(eden_size > 0 && survivor_size <= eden_size, "just checking");
if (eden_size < minimum_eden_size) {
// May happen due to 64Kb rounding, if so adjust eden size back up
minimum_eden_size = align_size_up(minimum_eden_size, alignment);
uintx maximum_survivor_size = (size - minimum_eden_size) / 2;
uintx unaligned_survivor_size =
align_size_down(maximum_survivor_size, alignment);
survivor_size = MAX2(unaligned_survivor_size, alignment);
eden_size = size - (2*survivor_size);
assert(eden_size > 0 && survivor_size <= eden_size, "just checking");
assert(eden_size >= minimum_eden_size, "just checking");
}
char *eden_start = _virtual_space.low();
char *from_start = eden_start + eden_size;
char *to_start = from_start + survivor_size;
char *to_end = to_start + survivor_size;
assert(to_end == _virtual_space.high(), "just checking");
assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment");
assert(Space::is_aligned((HeapWord*)from_start), "checking alignment");
assert(Space::is_aligned((HeapWord*)to_start), "checking alignment");
MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start);
MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start);
MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end);
eden()->initialize(edenMR, (minimum_eden_size == 0));
from()->initialize(fromMR, true);
to()->initialize(toMR , true);
if (jvmpi::is_event_enabled(JVMPI_EVENT_ARENA_NEW)) {
CollectedHeap* ch = Universe::heap();
jvmpi::post_arena_new_event(ch->addr_to_arena_id(eden_start), "Eden");
jvmpi::post_arena_new_event(ch->addr_to_arena_id(from_start), "Semi");
jvmpi::post_arena_new_event(ch->addr_to_arena_id(to_start), "Semi");
}
}
void DefNewGeneration::remove_forwarding_pointers() {
RemoveForwardPointerClosure rspc;
eden()->object_iterate(&rspc);
from()->object_iterate(&rspc);
// Now restore saved marks, if any.
assert(_objs_with_preserved_marks.size() == _preserved_marks_of_objs.size(),
"should be the same");
while (!_objs_with_preserved_marks.is_empty()) {
oop obj = _objs_with_preserved_marks.pop();
markOop m = _preserved_marks_of_objs.pop();
obj->set_mark(m);
}
_objs_with_preserved_marks.clear(true);
_preserved_marks_of_objs.clear(true);
}
void DefNewGeneration::swap_spaces() {
ContiguousSpace* s = from();
_from_space = to();
_to_space = s;
eden()->set_next_compaction_space(from());
// The to-space is normally empty before a compaction so need
// not be considered. The exception is during promotion
// failure handling when to-space can contain live objects.
from()->set_next_compaction_space(NULL);
if (UsePerfData) {
CSpaceCounters* c = _from_counters;
_from_counters = _to_counters;
_to_counters = c;
}
}
int main()
{
world odd;
world even;
int i;
init(odd);
init(even);
eden(even);
// simulation
for (i = 0; i < CYCLES; ++i) {
if ((i % 2)) {
update(even,odd);
dele(odd);
}
else {
update(odd,even);
dele(even);
}
}
}
void DefNewGeneration::remove_forwarding_pointers() {
RemoveForwardPointerClosure rspc;
eden()->object_iterate(&rspc);
from()->object_iterate(&rspc);
// Now restore saved marks, if any.
if (_objs_with_preserved_marks != NULL) {
assert(_preserved_marks_of_objs != NULL, "Both or none.");
assert(_objs_with_preserved_marks->length() ==
_preserved_marks_of_objs->length(), "Both or none.");
for (int i = 0; i < _objs_with_preserved_marks->length(); i++) {
oop obj = _objs_with_preserved_marks->at(i);
markOop m = _preserved_marks_of_objs->at(i);
obj->set_mark(m);
}
delete _objs_with_preserved_marks;
delete _preserved_marks_of_objs;
_objs_with_preserved_marks = NULL;
_preserved_marks_of_objs = NULL;
}
}
void DefNewGeneration::object_iterate(ObjectClosure* blk) {
eden()->object_iterate(blk);
from()->object_iterate(blk);
}
size_t DefNewGeneration::contiguous_available() const {
return eden()->free();
}
size_t DefNewGeneration::capacity_before_gc() const {
return eden()->capacity();
}
size_t DefNewGeneration::unsafe_max_alloc_nogc() const {
return eden()->free();
}
size_t DefNewGeneration::free() const {
return eden()->free()
+ from()->free(); // to() is only used during scavenge
}
void DefNewGeneration::compute_new_size() {
// This is called after a gc that includes the following generation
// (which is required to exist.) So from-space will normally be empty.
// Note that we check both spaces, since if scavenge failed they revert roles.
// If not we bail out (otherwise we would have to relocate the objects)
if (!from()->is_empty() || !to()->is_empty()) {
return;
}
int next_level = level() + 1;
GenCollectedHeap* gch = GenCollectedHeap::heap();
assert(next_level < gch->_n_gens,
"DefNewGeneration cannot be an oldest gen");
Generation* next_gen = gch->_gens[next_level];
size_t old_size = next_gen->capacity();
size_t new_size_before = _virtual_space.committed_size();
size_t min_new_size = spec()->init_size();
size_t max_new_size = reserved().byte_size();
assert(min_new_size <= new_size_before &&
new_size_before <= max_new_size,
"just checking");
// All space sizes must be multiples of Generation::GenGrain.
size_t alignment = Generation::GenGrain;
// Compute desired new generation size based on NewRatio and
// NewSizeThreadIncrease
size_t desired_new_size = old_size/NewRatio;
int threads_count = Threads::number_of_non_daemon_threads();
size_t thread_increase_size = threads_count * NewSizeThreadIncrease;
desired_new_size = align_size_up(desired_new_size + thread_increase_size, alignment);
// Adjust new generation size
desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size);
assert(desired_new_size <= max_new_size, "just checking");
bool changed = false;
if (desired_new_size > new_size_before) {
size_t change = desired_new_size - new_size_before;
assert(change % alignment == 0, "just checking");
if (expand(change)) {
changed = true;
}
// If the heap failed to expand to the desired size,
// "changed" will be false. If the expansion failed
// (and at this point it was expected to succeed),
// ignore the failure (leaving "changed" as false).
}
if (desired_new_size < new_size_before && eden()->is_empty()) {
// bail out of shrinking if objects in eden
size_t change = new_size_before - desired_new_size;
assert(change % alignment == 0, "just checking");
_virtual_space.shrink_by(change);
changed = true;
}
if (changed) {
// The spaces have already been mangled at this point but
// may not have been cleared (set top = bottom) and should be.
// Mangling was done when the heap was being expanded.
compute_space_boundaries(eden()->used(),
SpaceDecorator::Clear,
SpaceDecorator::DontMangle);
MemRegion cmr((HeapWord*)_virtual_space.low(),
(HeapWord*)_virtual_space.high());
Universe::heap()->barrier_set()->resize_covered_region(cmr);
if (Verbose && PrintGC) {
size_t new_size_after = _virtual_space.committed_size();
size_t eden_size_after = eden()->capacity();
size_t survivor_size_after = from()->capacity();
gclog_or_tty->print("New generation size " SIZE_FORMAT "K->"
SIZE_FORMAT "K [eden="
SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]",
new_size_before/K, new_size_after/K,
eden_size_after/K, survivor_size_after/K);
if (WizardMode) {
gclog_or_tty->print("[allowed " SIZE_FORMAT "K extra for %d threads]",
thread_increase_size/K, threads_count);
}
gclog_or_tty->cr();
}
}
}
// Moved from inline file as they are not called inline
CompactibleSpace* DefNewGeneration::first_compaction_space() const {
return eden();
}
void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size,
bool clear_space,
bool mangle_space) {
uintx alignment =
GenCollectedHeap::heap()->collector_policy()->space_alignment();
// If the spaces are being cleared (only done at heap initialization
// currently), the survivor spaces need not be empty.
// Otherwise, no care is taken for used areas in the survivor spaces
// so check.
assert(clear_space || (to()->is_empty() && from()->is_empty()),
"Initialization of the survivor spaces assumes these are empty");
// Compute sizes
uintx size = _virtual_space.committed_size();
uintx survivor_size = compute_survivor_size(size, alignment);
uintx eden_size = size - (2*survivor_size);
assert(eden_size > 0 && survivor_size <= eden_size, "just checking");
if (eden_size < minimum_eden_size) {
// May happen due to 64Kb rounding, if so adjust eden size back up
minimum_eden_size = align_size_up(minimum_eden_size, alignment);
uintx maximum_survivor_size = (size - minimum_eden_size) / 2;
uintx unaligned_survivor_size =
align_size_down(maximum_survivor_size, alignment);
survivor_size = MAX2(unaligned_survivor_size, alignment);
eden_size = size - (2*survivor_size);
assert(eden_size > 0 && survivor_size <= eden_size, "just checking");
assert(eden_size >= minimum_eden_size, "just checking");
}
char *eden_start = _virtual_space.low();
char *from_start = eden_start + eden_size;
char *to_start = from_start + survivor_size;
char *to_end = to_start + survivor_size;
assert(to_end == _virtual_space.high(), "just checking");
assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment");
assert(Space::is_aligned((HeapWord*)from_start), "checking alignment");
assert(Space::is_aligned((HeapWord*)to_start), "checking alignment");
MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start);
MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start);
MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end);
// A minimum eden size implies that there is a part of eden that
// is being used and that affects the initialization of any
// newly formed eden.
bool live_in_eden = minimum_eden_size > 0;
// If not clearing the spaces, do some checking to verify that
// the space are already mangled.
if (!clear_space) {
// Must check mangling before the spaces are reshaped. Otherwise,
// the bottom or end of one space may have moved into another
// a failure of the check may not correctly indicate which space
// is not properly mangled.
if (ZapUnusedHeapArea) {
HeapWord* limit = (HeapWord*) _virtual_space.high();
eden()->check_mangled_unused_area(limit);
from()->check_mangled_unused_area(limit);
to()->check_mangled_unused_area(limit);
}
}
// Reset the spaces for their new regions.
eden()->initialize(edenMR,
clear_space && !live_in_eden,
SpaceDecorator::Mangle);
// If clear_space and live_in_eden, we will not have cleared any
// portion of eden above its top. This can cause newly
// expanded space not to be mangled if using ZapUnusedHeapArea.
// We explicitly do such mangling here.
if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) {
eden()->mangle_unused_area();
}
from()->initialize(fromMR, clear_space, mangle_space);
to()->initialize(toMR, clear_space, mangle_space);
// Set next compaction spaces.
eden()->set_next_compaction_space(from());
// The to-space is normally empty before a compaction so need
// not be considered. The exception is during promotion
// failure handling when to-space can contain live objects.
from()->set_next_compaction_space(NULL);
}
void DefNewGeneration::object_iterate_since_last_GC(ObjectClosure* cl) {
// $$$ This may be wrong in case of "scavenge failure"?
eden()->object_iterate(cl);
}
void DefNewGeneration::reset_saved_marks() {
eden()->reset_saved_mark();
to()->reset_saved_mark();
from()->reset_saved_mark();
}
HeapWord* DefNewGeneration::par_allocate(size_t word_size,
bool is_tlab) {
return eden()->par_allocate(word_size);
}
void DefNewGeneration::record_spaces_top() {
assert(ZapUnusedHeapArea, "Not mangling unused space");
eden()->set_top_for_allocations();
to()->set_top_for_allocations();
from()->set_top_for_allocations();
}
void DefNewGeneration::collect(bool full,
bool clear_all_soft_refs,
size_t size,
bool is_tlab) {
assert(full || size > 0, "otherwise we don't want to collect");
GenCollectedHeap* gch = GenCollectedHeap::heap();
_gc_timer->register_gc_start();
DefNewTracer gc_tracer;
gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start());
_next_gen = gch->next_gen(this);
// If the next generation is too full to accommodate promotion
// from this generation, pass on collection; let the next generation
// do it.
if (!collection_attempt_is_safe()) {
if (Verbose && PrintGCDetails) {
gclog_or_tty->print(" :: Collection attempt not safe :: ");
}
gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one
return;
}
assert(to()->is_empty(), "Else not collection_attempt_is_safe");
init_assuming_no_promotion_failure();
GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL);
// Capture heap used before collection (for printing).
size_t gch_prev_used = gch->used();
gch->trace_heap_before_gc(&gc_tracer);
SpecializationStats::clear();
// These can be shared for all code paths
IsAliveClosure is_alive(this);
ScanWeakRefClosure scan_weak_ref(this);
age_table()->clear();
to()->clear(SpaceDecorator::Mangle);
gch->rem_set()->prepare_for_younger_refs_iterate(false);
assert(gch->no_allocs_since_save_marks(0),
"save marks have not been newly set.");
// Not very pretty.
CollectorPolicy* cp = gch->collector_policy();
FastScanClosure fsc_with_no_gc_barrier(this, false);
FastScanClosure fsc_with_gc_barrier(this, true);
KlassScanClosure klass_scan_closure(&fsc_with_no_gc_barrier,
gch->rem_set()->klass_rem_set());
set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier);
FastEvacuateFollowersClosure evacuate_followers(gch, _level, this,
&fsc_with_no_gc_barrier,
&fsc_with_gc_barrier);
assert(gch->no_allocs_since_save_marks(0),
"save marks have not been newly set.");
int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache;
gch->gen_process_strong_roots(_level,
true, // Process younger gens, if any,
// as strong roots.
true, // activate StrongRootsScope
true, // is scavenging
SharedHeap::ScanningOption(so),
&fsc_with_no_gc_barrier,
true, // walk *all* scavengable nmethods
&fsc_with_gc_barrier,
&klass_scan_closure);
// "evacuate followers".
evacuate_followers.do_void();
FastKeepAliveClosure keep_alive(this, &scan_weak_ref);
ReferenceProcessor* rp = ref_processor();
rp->setup_policy(clear_all_soft_refs);
const ReferenceProcessorStats& stats =
rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers,
NULL, _gc_timer);
gc_tracer.report_gc_reference_stats(stats);
if (!_promotion_failed) {
// Swap the survivor spaces.
eden()->clear(SpaceDecorator::Mangle);
from()->clear(SpaceDecorator::Mangle);
if (ZapUnusedHeapArea) {
// This is now done here because of the piece-meal mangling which
// can check for valid mangling at intermediate points in the
// collection(s). When a minor collection fails to collect
// sufficient space resizing of the young generation can occur
// an redistribute the spaces in the young generation. Mangle
// here so that unzapped regions don't get distributed to
// other spaces.
to()->mangle_unused_area();
}
swap_spaces();
assert(to()->is_empty(), "to space should be empty now");
adjust_desired_tenuring_threshold();
// A successful scavenge should restart the GC time limit count which is
// for full GC's.
AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy();
size_policy->reset_gc_overhead_limit_count();
if (PrintGC && !PrintGCDetails) {
gch->print_heap_change(gch_prev_used);
}
assert(!gch->incremental_collection_failed(), "Should be clear");
} else {
assert(_promo_failure_scan_stack.is_empty(), "post condition");
_promo_failure_scan_stack.clear(true); // Clear cached segments.
remove_forwarding_pointers();
if (PrintGCDetails) {
gclog_or_tty->print(" (promotion failed) ");
}
// Add to-space to the list of space to compact
// when a promotion failure has occurred. In that
// case there can be live objects in to-space
// as a result of a partial evacuation of eden
// and from-space.
swap_spaces(); // For uniformity wrt ParNewGeneration.
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();
gc_tracer.report_promotion_failed(_promotion_failed_info);
// Reset the PromotionFailureALot counters.
NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();)
}
// set new iteration safe limit for the survivor spaces
from()->set_concurrent_iteration_safe_limit(from()->top());
to()->set_concurrent_iteration_safe_limit(to()->top());
SpecializationStats::print();
// We need to use a monotonically non-decreasing time in ms
// or we will see time-warp warnings and os::javaTimeMillis()
// does not guarantee monotonicity.
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;
update_time_of_last_gc(now);
gch->trace_heap_after_gc(&gc_tracer);
gc_tracer.report_tenuring_threshold(tenuring_threshold());
_gc_timer->register_gc_end();
gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions());
}
void DefNewGeneration::gc_prologue(bool full) {
// Ensure that _end and _soft_end are the same in eden space.
eden()->set_soft_end(eden()->end());
}
void DefNewGeneration::verify(bool allow_dirty) {
eden()->verify(allow_dirty);
from()->verify(allow_dirty);
to()->verify(allow_dirty);
}
bool DefNewGeneration::no_allocs_since_save_marks() {
assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden");
assert(from()->saved_mark_at_top(), "Violated spec - alloc in from");
return to()->saved_mark_at_top();
}
size_t DefNewGeneration::tlab_capacity() const {
return eden()->capacity();
}
