jint ParallelScavengeHeap::initialize() {
// Cannot be initialized until after the flags are parsed
GenerationSizer flag_parser;
size_t max_young_size = flag_parser.max_young_gen_size();
size_t max_old_size = flag_parser.max_old_gen_size();
if (UseMPSS && max_young_size + max_old_size >= LargePageHeapSizeThreshold) {
set_generation_alignment(LargePageSizeInBytes);
}
const size_t alignment = generation_alignment();
// Check alignments
// NEEDS_CLEANUP The default TwoGenerationCollectorPolicy uses
// NewRatio; it should check UseAdaptiveSizePolicy. Changes from
// generationSizer could move to the common code.
size_t min_young_size =
align_size_up(flag_parser.min_young_gen_size(), alignment);
size_t young_size = align_size_up(flag_parser.young_gen_size(), alignment);
max_young_size = align_size_up(max_young_size, alignment);
size_t min_old_size =
align_size_up(flag_parser.min_old_gen_size(), alignment);
size_t old_size = align_size_up(flag_parser.old_gen_size(), alignment);
old_size = MAX2(old_size, min_old_size);
max_old_size = align_size_up(max_old_size, alignment);
size_t perm_size = align_size_up(flag_parser.perm_gen_size(), alignment);
size_t max_perm_size = align_size_up(flag_parser.max_perm_gen_size(),
alignment);
// Calculate the total size.
size_t total_reserved = max_young_size + max_old_size + max_perm_size;
if (UseISM || UsePermISM) {
total_reserved = round_to(total_reserved, LargePageSizeInBytes);
}
ReservedSpace heap_rs(total_reserved, alignment, UseISM || UsePermISM);
if (!heap_rs.is_reserved()) {
vm_shutdown_during_initialization(
"Could not reserve enough space for object heap");
return JNI_ENOMEM;
}
_reserved_byte_size = heap_rs.size();
_reserved = MemRegion((HeapWord*)heap_rs.base(),
(HeapWord*)(heap_rs.base() + heap_rs.size()));
HeapWord* boundary = (HeapWord*)(heap_rs.base() + max_young_size);
CardTableExtension* card_table_barrier_set = new CardTableExtension(_reserved, 3);
_barrier_set = card_table_barrier_set;
oopDesc::set_bs(_barrier_set);
if (_barrier_set == NULL) {
vm_shutdown_during_initialization(
"Could not reserve enough space for barrier set");
return JNI_ENOMEM;
}
// Initial young gen size is 4 Mb
size_t init_young_size = align_size_up(4 * M, alignment);
init_young_size = MAX2(MIN2(init_young_size, max_young_size), young_size);
// Divide up the reserved space: perm, old, young
ReservedSpace perm_rs = heap_rs.first_part(max_perm_size);
ReservedSpace old_young_rs
= heap_rs.last_part(max_perm_size);
ReservedSpace old_rs = old_young_rs.first_part(max_old_size);
heap_rs = old_young_rs.last_part(max_old_size);
ReservedSpace young_rs = heap_rs.first_part(max_young_size);
assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap");
// Make up the generations
// Calculate the maximum size that a generation can grow. This
// includes growth into the other generation. Note that the
// parameter _max_gen_size is kept as the maximum
// size of the generation as the boundaries currently stand.
// _max_gen_size is still used as that value.
double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0;
double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0;
// Regarding SEPARATE_PATHS. If SEPARATE_PATHS is defined, then
// the generations are created without the use of AdjoiningGenerations
// in the case where boundary moving is not an option. This is
// being kept until the code review in case there is some desire
// to keep the new code out of the path of the previous code.
// One effect of using AdjoiningGenerations for both cases is that
// is that the generations in AdjoiningGenerations need to be
// PSOldGen and PSYoungGen as opposed to ASPSOldGen and ASPSYoungGen.
// This latter means that methods such as available_for_expansion()
// need to be defined in PSOldGen.
#undef SEPARATE_PATHS
#ifdef SEPARATE_PATHS
if (UseAdaptiveSizePolicy && UseAdaptiveGCBoundary) {
#endif
_gens = new AdjoiningGenerations(old_young_rs,
old_size,
min_old_size,
max_old_size,
init_young_size,
min_young_size,
max_young_size,
alignment);
_old_gen = _gens->old_gen();
_young_gen = _gens->young_gen();
_size_policy =
new PSAdaptiveSizePolicy(young_gen()->eden_space()->capacity_in_bytes(),
old_gen()->capacity_in_bytes(),
young_gen()->to_space()->capacity_in_bytes(),
generation_alignment(),
intra_generation_alignment(),
max_gc_pause_sec,
max_gc_minor_pause_sec,
GCTimeRatio
);
#ifdef SEPARATE_PATHS
} else {
// Same as for case where boundary does not move.
size_t old_size_limit, young_size_limit;
old_size_limit = max_old_size;
young_size_limit = max_young_size;
_young_gen = new PSYoungGen(init_young_size,
min_young_size,
max_young_size);
_old_gen = new PSOldGen(old_size,
min_old_size,
max_old_size,
"old", 1);
_gens = 0;
_young_gen->initialize(young_rs, alignment);
_old_gen->initialize(old_rs, alignment, "old", 1);
_size_policy =
new PSAdaptiveSizePolicy(young_gen()->eden_space()->capacity_in_bytes(),
old_gen()->capacity_in_bytes(),
young_gen()->to_space()->capacity_in_bytes(),
generation_alignment(),
intra_generation_alignment(),
max_gc_pause_sec,
max_gc_minor_pause_sec,
GCTimeRatio
);
}
#endif
_perm_gen = new PSPermGen(perm_rs,
alignment,
perm_size,
perm_size,
max_perm_size,
"perm", 2);
assert(!UseAdaptiveGCBoundary ||
(old_gen()->virtual_space()->high_boundary() ==
young_gen()->virtual_space()->low_boundary()),
"Boundaries must meet");
// initialize the policy counters - 2 collectors, 3 generations
_gc_policy_counters =
new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy);
_psh = this;
return JNI_OK;
}
jint ParallelScavengeHeap::initialize() {
CollectedHeap::pre_initialize();
// Cannot be initialized until after the flags are parsed
// GenerationSizer flag_parser;
_collector_policy = new GenerationSizer();
size_t yg_min_size = _collector_policy->min_young_gen_size();
size_t yg_max_size = _collector_policy->max_young_gen_size();
size_t og_min_size = _collector_policy->min_old_gen_size();
size_t og_max_size = _collector_policy->max_old_gen_size();
// Why isn't there a min_perm_gen_size()?
size_t pg_min_size = _collector_policy->perm_gen_size();
size_t pg_max_size = _collector_policy->max_perm_gen_size();
trace_gen_sizes("ps heap raw",
pg_min_size, pg_max_size,
og_min_size, og_max_size,
yg_min_size, yg_max_size);
// The ReservedSpace ctor used below requires that the page size for the perm
// gen is <= the page size for the rest of the heap (young + old gens).
const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size,
yg_max_size + og_max_size,
8);
const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size,
pg_max_size, 16),
og_page_sz);
const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz);
const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz);
const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz);
// Update sizes to reflect the selected page size(s).
//
// NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it
// should check UseAdaptiveSizePolicy. Changes from generationSizer could
// move to the common code.
yg_min_size = align_size_up(yg_min_size, yg_align);
yg_max_size = align_size_up(yg_max_size, yg_align);
size_t yg_cur_size =
align_size_up(_collector_policy->young_gen_size(), yg_align);
yg_cur_size = MAX2(yg_cur_size, yg_min_size);
og_min_size = align_size_up(og_min_size, og_align);
og_max_size = align_size_up(og_max_size, og_align);
size_t og_cur_size =
align_size_up(_collector_policy->old_gen_size(), og_align);
og_cur_size = MAX2(og_cur_size, og_min_size);
pg_min_size = align_size_up(pg_min_size, pg_align);
pg_max_size = align_size_up(pg_max_size, pg_align);
size_t pg_cur_size = pg_min_size;
trace_gen_sizes("ps heap rnd",
pg_min_size, pg_max_size,
og_min_size, og_max_size,
yg_min_size, yg_max_size);
const size_t total_reserved = pg_max_size + og_max_size + yg_max_size;
char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop);
// The main part of the heap (old gen + young gen) can often use a larger page
// size than is needed or wanted for the perm gen. Use the "compound
// alignment" ReservedSpace ctor to avoid having to use the same page size for
// all gens.
ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size,
og_align, addr);
if (UseCompressedOops) {
if (addr != NULL && !heap_rs.is_reserved()) {
// Failed to reserve at specified address - the requested memory
// region is taken already, for example, by 'java' launcher.
// Try again to reserver heap higher.
addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop);
ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size,
og_align, addr);
if (addr != NULL && !heap_rs0.is_reserved()) {
// Failed to reserve at specified address again - give up.
addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop);
assert(addr == NULL, "");
ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size,
og_align, addr);
heap_rs = heap_rs1;
} else {
heap_rs = heap_rs0;
}
}
}
os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz,
heap_rs.base(), pg_max_size);
os::trace_page_sizes("ps main", og_min_size + yg_min_size,
og_max_size + yg_max_size, og_page_sz,
heap_rs.base() + pg_max_size,
heap_rs.size() - pg_max_size);
if (!heap_rs.is_reserved()) {
vm_shutdown_during_initialization(
"Could not reserve enough space for object heap");
return JNI_ENOMEM;
}
_reserved = MemRegion((HeapWord*)heap_rs.base(),
(HeapWord*)(heap_rs.base() + heap_rs.size()));
CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3);
_barrier_set = barrier_set;
oopDesc::set_bs(_barrier_set);
if (_barrier_set == NULL) {
vm_shutdown_during_initialization(
"Could not reserve enough space for barrier set");
return JNI_ENOMEM;
}
// Initial young gen size is 4 Mb
//
// XXX - what about flag_parser.young_gen_size()?
const size_t init_young_size = align_size_up(4 * M, yg_align);
yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size);
// Split the reserved space into perm gen and the main heap (everything else).
// The main heap uses a different alignment.
ReservedSpace perm_rs = heap_rs.first_part(pg_max_size);
ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align);
// Make up the generations
// Calculate the maximum size that a generation can grow. This
// includes growth into the other generation. Note that the
// parameter _max_gen_size is kept as the maximum
// size of the generation as the boundaries currently stand.
// _max_gen_size is still used as that value.
double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0;
double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0;
_gens = new AdjoiningGenerations(main_rs,
og_cur_size,
og_min_size,
og_max_size,
yg_cur_size,
yg_min_size,
yg_max_size,
yg_align);
_old_gen = _gens->old_gen();
_young_gen = _gens->young_gen();
const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes();
const size_t old_capacity = _old_gen->capacity_in_bytes();
const size_t initial_promo_size = MIN2(eden_capacity, old_capacity);
_size_policy =
new PSAdaptiveSizePolicy(eden_capacity,
initial_promo_size,
young_gen()->to_space()->capacity_in_bytes(),
intra_heap_alignment(),
max_gc_pause_sec,
max_gc_minor_pause_sec,
GCTimeRatio
);
_perm_gen = new PSPermGen(perm_rs,
pg_align,
pg_cur_size,
pg_cur_size,
pg_max_size,
"perm", 2);
assert(!UseAdaptiveGCBoundary ||
(old_gen()->virtual_space()->high_boundary() ==
young_gen()->virtual_space()->low_boundary()),
"Boundaries must meet");
// initialize the policy counters - 2 collectors, 3 generations
_gc_policy_counters =
new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy);
_psh = this;
// Set up the GCTaskManager
_gc_task_manager = GCTaskManager::create(ParallelGCThreads);
if (UseParallelOldGC && !PSParallelCompact::initialize()) {
return JNI_ENOMEM;
}
return JNI_OK;
}
void ParallelScavengeHeap::initialize() {
// Cannot be initialized until after the flags are parsed
GenerationSizer flag_parser;
const size_t alignment = min_alignment();
// Check alignments
// NEEDS_CLEANUP The default TwoGenerationCollectorPolicy uses
// NewRatio; it should check UseAdaptiveSizePolicy. Changes from
// generationSizer could move to the common code.
size_t young_size = align_size_up(flag_parser.young_gen_size(), alignment);
size_t max_young_size = align_size_up(flag_parser.max_young_gen_size(),
alignment);
size_t old_size = align_size_up(flag_parser.old_gen_size(), alignment);
size_t max_old_size = align_size_up(flag_parser.max_old_gen_size(),
alignment);
size_t perm_size = align_size_up(flag_parser.perm_gen_size(), alignment);
size_t max_perm_size = align_size_up(flag_parser.max_perm_gen_size(),
alignment);
// Calculate the total size.
size_t total_reserved = max_young_size + max_old_size + max_perm_size;
if (UseISM || UsePermISM) {
total_reserved = round_to(total_reserved, LargePageSizeInBytes);
}
ReservedSpace heap_rs(total_reserved, alignment, UseISM || UsePermISM);
if (!heap_rs.is_reserved()) {
vm_exit_during_initialization("Could not reserve enough space for "
"object heap");
}
_reserved = MemRegion((HeapWord*)heap_rs.base(),
(HeapWord*)(heap_rs.base() + heap_rs.size()));
HeapWord* boundary = (HeapWord*)(heap_rs.base() + max_young_size);
CardTableExtension* card_table_barrier_set = new CardTableExtension(_reserved, 3);
_barrier_set = card_table_barrier_set;
oopDesc::set_bs(_barrier_set);
if (_barrier_set == NULL) {
vm_exit_during_initialization("Could not reserve enough space for "
"barrier set");
}
// Initial young gen size is 4 Mb
size_t init_young_size = align_size_up(4 * M, alignment);
init_young_size = MAX2(MIN2(init_young_size, max_young_size), young_size);
ReservedSpace generation_rs = heap_rs.first_part(max_young_size);
_young_gen = new PSYoungGen(generation_rs,
init_young_size,
young_size,
max_young_size);
heap_rs = heap_rs.last_part(max_young_size);
generation_rs = heap_rs.first_part(max_old_size);
_old_gen = new PSOldGen(generation_rs,
old_size,
old_size,
max_old_size,
"old", 1);
heap_rs = heap_rs.last_part(max_old_size);
_perm_gen = new PSPermGen(heap_rs,
perm_size,
perm_size,
max_perm_size,
"perm", 2);
_size_policy = new AdaptiveSizePolicy(young_gen()->eden_space()->capacity_in_bytes(),
old_gen()->capacity_in_bytes(),
young_gen()->to_space()->capacity_in_bytes(),
max_young_size,
max_old_size,
alignment);
// initialize the policy counters - 2 collectors, 3 generations
_gc_policy_counters = new GCPolicyCounters(PERF_GC, "ParScav:MSC", 2, 3);
}
