void GenCollectorPolicy::initialize_flags() {
// All sizes must be multiples of the generation granularity.
set_min_alignment((uintx) Generation::GenGrain);
set_max_alignment(compute_max_alignment());
CollectorPolicy::initialize_flags();
// All generational heaps have a youngest gen; handle those flags here.
// Adjust max size parameters
if (NewSize > MaxNewSize) {
MaxNewSize = NewSize;
}
NewSize = align_size_down(NewSize, min_alignment());
MaxNewSize = align_size_down(MaxNewSize, min_alignment());
// Check validity of heap flags
assert(NewSize % min_alignment() == 0, "eden space alignment");
assert(MaxNewSize % min_alignment() == 0, "survivor space alignment");
if (NewSize < 3*min_alignment()) {
// make sure there room for eden and two survivor spaces
vm_exit_during_initialization("Too small new size specified");
}
if (SurvivorRatio < 1 || NewRatio < 1) {
vm_exit_during_initialization("Invalid heap ratio specified");
}
}
size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) {
size_t x = base_size / (NewRatio+1);
size_t new_gen_size = x > min_alignment() ?
align_size_down(x, min_alignment()) :
min_alignment();
return new_gen_size;
}
// Call this method during the sizing of the gen1 to make
// adjustments to gen0 because of gen1 sizing policy. gen0 initially has
// the most freedom in sizing because it is done before the
// policy for gen1 is applied. Once gen1 policies have been applied,
// there may be conflicts in the shape of the heap and this method
// is used to make the needed adjustments. The application of the
// policies could be more sophisticated (iterative for example) but
// keeping it simple also seems a worthwhile goal.
bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr,
size_t* gen1_size_ptr,
size_t heap_size,
size_t min_gen0_size) {
bool result = false;
if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) {
if (((*gen0_size_ptr + OldSize) > heap_size) &&
(heap_size - min_gen0_size) >= min_alignment()) {
// Adjust gen0 down to accomodate OldSize
*gen0_size_ptr = heap_size - min_gen0_size;
*gen0_size_ptr =
MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()),
min_alignment());
assert(*gen0_size_ptr > 0, "Min gen0 is too large");
result = true;
} else {
*gen1_size_ptr = heap_size - *gen0_size_ptr;
*gen1_size_ptr =
MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()),
min_alignment());
}
}
return result;
}
void TwoGenerationCollectorPolicy::initialize_size_info() {
// User inputs from -mx and ms are aligned
MaxNewSize = align_size_down(MaxNewSize, min_alignment());
uintx initial_heap_size = align_size_up(Arguments::initial_heap_size(), min_alignment());
uintx max_heap_size = align_size_up(MaxHeapSize, max_alignment());
#ifndef COMPILER2 // Don't degrade server performance for footprint
if (FLAG_IS_DEFAULT(UseMPSS) && max_heap_size < LargePageHeapSizeThreshold) {
// No need for large granularity pages w/small heaps.
UseMPSS = false;
}
#endif
// Check validity of heap parameters from launcher
if (initial_heap_size == 0) {
initial_heap_size = NewSize + OldSize;
} else {
Universe::check_alignment(initial_heap_size, min_alignment(), "initial heap");
}
// Check heap parameter properties
if (initial_heap_size < M) {
vm_exit_during_initialization("Too small initial heap");
}
if (initial_heap_size <= NewSize) {
// make sure there is at least some room in old space
vm_exit_during_initialization("Too small initial heap for new size specified");
}
if (max_heap_size < initial_heap_size) {
vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified");
}
// Minimum sizes of the generations may be different than
// the initial sizes.
_min_gen0_size = NewSize;
_min_gen1_size = OldSize;
// Parameters are valid, compute area sizes.
size_t max_new_size = align_size_down(max_heap_size / (NewRatio+1),
min_alignment());
max_new_size = MIN2(MAX2(max_new_size, _min_gen0_size), MaxNewSize);
size_t desired_new_size = align_size_down(initial_heap_size / (NewRatio+1),
min_alignment());
size_t new_size = MIN2(MAX2(desired_new_size, _min_gen0_size), max_new_size);
// I'm putting this in to make sure the compilation of the code above is
// correct. At times, it hasn't been. -dld 04/00.
guarantee(new_size <= max_new_size &&
new_size <= MAX2(desired_new_size, _min_gen0_size),
"Or what gives");
_initial_gen0_size = new_size;
_max_gen0_size = max_new_size;
_initial_gen1_size = initial_heap_size - new_size;
_max_gen1_size = max_heap_size - max_new_size;
}
void TwoGenerationCollectorPolicy::initialize_flags() {
GenCollectorPolicy::initialize_flags();
OldSize = align_size_down(OldSize, min_alignment());
if (NewSize + OldSize > MaxHeapSize) {
MaxHeapSize = NewSize + OldSize;
}
MaxHeapSize = align_size_up(MaxHeapSize, max_alignment());
always_do_update_barrier = UseConcMarkSweepGC;
// Check validity of heap flags
assert(OldSize % min_alignment() == 0, "old space alignment");
assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment");
}
void CollectorPolicy::initialize_size_info() {
// User inputs from -mx and ms are aligned
set_initial_heap_byte_size(InitialHeapSize);
if (initial_heap_byte_size() == 0) {
set_initial_heap_byte_size(NewSize + OldSize);
}
set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size,
min_alignment()));
set_min_heap_byte_size(Arguments::min_heap_size());
if (min_heap_byte_size() == 0) {
set_min_heap_byte_size(NewSize + OldSize);
}
set_min_heap_byte_size(align_size_up(_min_heap_byte_size,
min_alignment()));
set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment()));
// Check heap parameter properties
if (initial_heap_byte_size() < M) {
vm_exit_during_initialization("Too small initial heap");
}
// Check heap parameter properties
if (min_heap_byte_size() < M) {
vm_exit_during_initialization("Too small minimum heap");
}
if (initial_heap_byte_size() <= NewSize) {
// make sure there is at least some room in old space
vm_exit_during_initialization("Too small initial heap for new size specified");
}
if (max_heap_byte_size() < min_heap_byte_size()) {
vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified");
}
if (initial_heap_byte_size() < min_heap_byte_size()) {
vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified");
}
if (max_heap_byte_size() < initial_heap_byte_size()) {
vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified");
}
if (PrintGCDetails && Verbose) {
gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap "
SIZE_FORMAT " Maximum heap " SIZE_FORMAT,
min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size());
}
}
void CollectorPolicy::initialize_flags() {
if (PermSize > MaxPermSize) {
MaxPermSize = PermSize;
}
PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment()));
MaxPermSize = align_size_up(MaxPermSize, max_alignment());
MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment()));
MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment()));
MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment());
SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment());
SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment());
SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment());
assert(PermSize % min_alignment() == 0, "permanent space alignment");
assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment");
assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment");
assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment");
assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment");
if (PermSize < M) {
vm_exit_during_initialization("Too small initial permanent heap");
}
}
/**
* 检查/调整永久代的内存配置
*/
void CollectorPolicy::initialize_flags() {
if (PermSize > MaxPermSize) {
MaxPermSize = PermSize;
}
PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment()));
// Don't increase Perm size limit above specified.
MaxPermSize = align_size_down(MaxPermSize, max_alignment());
if (PermSize > MaxPermSize) {
PermSize = MaxPermSize;
}
MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment()));
MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment()));
MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment());
SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment());
SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment());
SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment());
assert(PermSize % min_alignment() == 0, "permanent space alignment");
assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment");
assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment");
assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment");
assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment");
if (PermSize < M) {
printf("%s[%d] [tid: %lu]: 永久代配置太小: PermSize(%lu) < M(%lu).\n", __FILE__, __LINE__, pthread_self(), PermSize, M);
vm_exit_during_initialization("Too small initial permanent heap");
}
}
void CollectorPolicy::initialize_flags() {
assert(max_alignment() >= min_alignment(),
err_msg("max_alignment: " SIZE_FORMAT " less than min_alignment: " SIZE_FORMAT,
max_alignment(), min_alignment()));
assert(max_alignment() % min_alignment() == 0,
err_msg("max_alignment: " SIZE_FORMAT " not aligned by min_alignment: " SIZE_FORMAT,
max_alignment(), min_alignment()));
if (PermSize > MaxPermSize) {
MaxPermSize = PermSize;
}
PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment()));
// Don't increase Perm size limit above specified.
MaxPermSize = align_size_down(MaxPermSize, max_alignment());
if (PermSize > MaxPermSize) {
PermSize = MaxPermSize;
}
MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment()));
MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment()));
MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment());
SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment());
SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment());
SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment());
assert(PermSize % min_alignment() == 0, "permanent space alignment");
assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment");
assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment");
assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment");
assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment");
if (PermSize < M) {
vm_exit_during_initialization("Too small initial permanent heap");
}
}
void TwoGenerationCollectorPolicy::initialize_size_info() {
GenCollectorPolicy::initialize_size_info();
// At this point the minimum, initial and maximum sizes
// of the overall heap and of gen0 have been determined.
// The maximum gen1 size can be determined from the maximum gen0
// and maximum heap size since not explicit flags exits
// for setting the gen1 maximum.
_max_gen1_size = max_heap_byte_size() - _max_gen0_size;
_max_gen1_size =
MAX2((size_t)align_size_down(_max_gen1_size, min_alignment()),
min_alignment());
// If no explicit command line flag has been set for the
// gen1 size, use what is left for gen1.
if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) {
// The user has not specified any value or ergonomics
// has chosen a value (which may or may not be consistent
// with the overall heap size). In either case make
// the minimum, maximum and initial sizes consistent
// with the gen0 sizes and the overall heap sizes.
assert(min_heap_byte_size() > _min_gen0_size,
"gen0 has an unexpected minimum size");
set_min_gen1_size(min_heap_byte_size() - min_gen0_size());
set_min_gen1_size(
MAX2((size_t)align_size_down(_min_gen1_size, min_alignment()),
min_alignment()));
set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size());
set_initial_gen1_size(
MAX2((size_t)align_size_down(_initial_gen1_size, min_alignment()),
min_alignment()));
} else {
// It's been explicitly set on the command line. Use the
// OldSize and then determine the consequences.
set_min_gen1_size(OldSize);
set_initial_gen1_size(OldSize);
// If the user has explicitly set an OldSize that is inconsistent
// with other command line flags, issue a warning.
// The generation minimums and the overall heap mimimum should
// be within one heap alignment.
if ((_min_gen1_size + _min_gen0_size + min_alignment()) <
min_heap_byte_size()) {
warning("Inconsistency between minimum heap size and minimum "
"generation sizes: using minimum heap = " SIZE_FORMAT,
min_heap_byte_size());
}
if ((OldSize > _max_gen1_size)) {
warning("Inconsistency between maximum heap size and maximum "
"generation sizes: using maximum heap = " SIZE_FORMAT
" -XX:OldSize flag is being ignored",
max_heap_byte_size());
}
// If there is an inconsistency between the OldSize and the minimum and/or
// initial size of gen0, since OldSize was explicitly set, OldSize wins.
if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size,
min_heap_byte_size(), OldSize)) {
if (PrintGCDetails && Verbose) {
gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 "
SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
min_gen0_size(), initial_gen0_size(), max_gen0_size());
}
}
// Initial size
if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size,
initial_heap_byte_size(), OldSize)) {
if (PrintGCDetails && Verbose) {
gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 "
SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
min_gen0_size(), initial_gen0_size(), max_gen0_size());
}
}
}
// Enforce the maximum gen1 size.
set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size));
// Check that min gen1 <= initial gen1 <= max gen1
set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size));
set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size));
if (PrintGCDetails && Verbose) {
gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 "
SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT,
min_gen1_size(), initial_gen1_size(), max_gen1_size());
}
}
// Values set on the command line win over any ergonomically
// set command line parameters.
// Ergonomic choice of parameters are done before this
// method is called. Values for command line parameters such as NewSize
// and MaxNewSize feed those ergonomic choices into this method.
// This method makes the final generation sizings consistent with
// themselves and with overall heap sizings.
// In the absence of explicitly set command line flags, policies
// such as the use of NewRatio are used to size the generation.
void GenCollectorPolicy::initialize_size_info() {
CollectorPolicy::initialize_size_info();
// min_alignment() is used for alignment within a generation.
// There is additional alignment done down stream for some
// collectors that sometimes causes unwanted rounding up of
// generations sizes.
// Determine maximum size of gen0
size_t max_new_size = 0;
if (FLAG_IS_CMDLINE(MaxNewSize)) {
if (MaxNewSize < min_alignment()) {
max_new_size = min_alignment();
} else if (MaxNewSize >= max_heap_byte_size()) {
max_new_size = align_size_down(max_heap_byte_size() - min_alignment(),
min_alignment());
warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or "
"greater than the entire heap (" SIZE_FORMAT "k). A "
"new generation size of " SIZE_FORMAT "k will be used.",
MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K);
} else {
max_new_size = align_size_down(MaxNewSize, min_alignment());
}
// The case for FLAG_IS_ERGO(MaxNewSize) could be treated
// specially at this point to just use an ergonomically set
// MaxNewSize to set max_new_size. For cases with small
// heaps such a policy often did not work because the MaxNewSize
// was larger than the entire heap. The interpretation given
// to ergonomically set flags is that the flags are set
// by different collectors for their own special needs but
// are not allowed to badly shape the heap. This allows the
// different collectors to decide what's best for themselves
// without having to factor in the overall heap shape. It
// can be the case in the future that the collectors would
// only make "wise" ergonomics choices and this policy could
// just accept those choices. The choices currently made are
// not always "wise".
} else {
max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size());
// Bound the maximum size by NewSize below (since it historically
// would have been NewSize and because the NewRatio calculation could
// yield a size that is too small) and bound it by MaxNewSize above.
// Ergonomics plays here by previously calculating the desired
// NewSize and MaxNewSize.
max_new_size = MIN2(MAX2(max_new_size, (size_t)NewSize), (size_t)MaxNewSize);
}
assert(max_new_size > 0, "All paths should set max_new_size");
// Given the maximum gen0 size, determine the initial and
// minimum sizes.
if (max_heap_byte_size() == min_heap_byte_size()) {
// The maximum and minimum heap sizes are the same so
// the generations minimum and initial must be the
// same as its maximum.
set_min_gen0_size(max_new_size);
set_initial_gen0_size(max_new_size);
set_max_gen0_size(max_new_size);
} else {
size_t desired_new_size = 0;
if (!FLAG_IS_DEFAULT(NewSize)) {
// If NewSize is set ergonomically (for example by cms), it
// would make sense to use it. If it is used, also use it
// to set the initial size. Although there is no reason
// the minimum size and the initial size have to be the same,
// the current implementation gets into trouble during the calculation
// of the tenured generation sizes if they are different.
// Note that this makes the initial size and the minimum size
// generally small compared to the NewRatio calculation.
_min_gen0_size = NewSize;
desired_new_size = NewSize;
max_new_size = MAX2(max_new_size, (size_t) NewSize);
} else {
// For the case where NewSize is the default, use NewRatio
// to size the minimum and initial generation sizes.
// Use the default NewSize as the floor for these values. If
// NewRatio is overly large, the resulting sizes can be too
// small.
_min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()),
(size_t) NewSize);
desired_new_size =
MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()),
(size_t) NewSize);
}
assert(_min_gen0_size > 0, "Sanity check");
set_initial_gen0_size(desired_new_size);
set_max_gen0_size(max_new_size);
// At this point the desirable initial and minimum sizes have been
// determined without regard to the maximum sizes.
// Bound the sizes by the corresponding overall heap sizes.
set_min_gen0_size(
bound_minus_alignment(_min_gen0_size, min_heap_byte_size()));
set_initial_gen0_size(
bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size()));
set_max_gen0_size(
bound_minus_alignment(_max_gen0_size, max_heap_byte_size()));
// At this point all three sizes have been checked against the
// maximum sizes but have not been checked for consistency
// among the three.
// Final check min <= initial <= max
set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size));
set_initial_gen0_size(
MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size));
set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size));
}
if (PrintGCDetails && Verbose) {
gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 "
SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
min_gen0_size(), initial_gen0_size(), max_gen0_size());
}
}
size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size,
size_t maximum_size) {
size_t alignment = min_alignment();
size_t max_minus = maximum_size - alignment;
return desired_size < max_minus ? desired_size : max_minus;
}
void TwoGenerationCollectorPolicy::initialize_flags() {
// All space sizes must be multiples of car size in order for the
// CarTable to work. Similarly with the should_scavenge region size.
set_min_alignment(MAX2((uintx) CarSpace::car_size(), (uintx) Generation::GenGrain));
// The card marking array and the offset arrays for old generations are
// committed in os pages as well. Make sure they are entirely full (to
// avoid partial page problems), e.g. if 512 bytes heap corresponds to 1
// byte entry and the os page size is 4096, the maximum heap size should
// be 512*4096 = 2MB aligned.
set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name()));
assert(max_alignment() >= min_alignment() && max_alignment() % min_alignment() == 0, "invalid alignment constraints");
// Adjust max size parameters
if (NewSize > MaxNewSize) {
MaxNewSize = NewSize;
}
NewSize = align_size_down(NewSize, min_alignment());
MaxNewSize = align_size_down(MaxNewSize, min_alignment());
OldSize = align_size_down(OldSize, min_alignment());
if (NewSize + OldSize > MaxHeapSize) {
MaxHeapSize = NewSize + OldSize;
}
MaxHeapSize = align_size_up(MaxHeapSize, max_alignment());
if (PermSize > MaxPermSize) {
MaxPermSize = PermSize;
}
PermSize = align_size_down(PermSize, min_alignment());
MaxPermSize = align_size_down(MaxPermSize, max_alignment());
MinPermHeapExpansion = align_size_down(MinPermHeapExpansion, min_alignment());
MaxPermHeapExpansion = align_size_down(MaxPermHeapExpansion, min_alignment());
MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment());
always_do_update_barrier = UseConcMarkSweepGC;
BlockOffsetArrayUseUnallocatedBlock |= ParallelGCThreads > 0;
SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment());
SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment());
SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment());
// Check validity of heap flags
assert(NewSize % min_alignment() == 0, "eden space alignment");
assert(MaxNewSize % min_alignment() == 0, "survivor space alignment");
assert(OldSize % min_alignment() == 0, "old space alignment");
assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment");
assert(PermSize % min_alignment() == 0, "permanent space alignment");
assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment");
assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment");
assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment");
assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment");
if (NewSize < 3*min_alignment()) {
// make sure there room for eden and two survivor spaces
vm_exit_during_initialization("Too small new size specified");
}
if (PermSize < M) {
vm_exit_during_initialization("Too small initial permanent heap");
}
if (SurvivorRatio < 1 || NewRatio < 1) {
vm_exit_during_initialization("Invalid heap ratio specified");
}
}
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);
}
