1505
1506
1507 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1508 // set_use_compressed_oops().
1509 void Arguments::set_use_compressed_klass_ptrs() {
1510 #ifndef ZERO
1511 #ifdef _LP64
1512 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1513 if (!UseCompressedOops) {
1514 if (UseCompressedClassPointers) {
1515 warning("UseCompressedClassPointers requires UseCompressedOops");
1516 }
1517 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1518 } else {
1519 // Turn on UseCompressedClassPointers too
1520 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1521 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1522 }
1523 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1524 if (UseCompressedClassPointers) {
1525 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1526 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1527 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1528 }
1529 }
1530 }
1531 #endif // _LP64
1532 #endif // !ZERO
1533 }
1534
1535 void Arguments::set_conservative_max_heap_alignment() {
1536 // The conservative maximum required alignment for the heap is the maximum of
1537 // the alignments imposed by several sources: any requirements from the heap
1538 // itself, the collector policy and the maximum page size we may run the VM
1539 // with.
1540 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1541 #if INCLUDE_ALL_GCS
1542 if (UseParallelGC) {
1543 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1544 } else if (UseG1GC) {
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1505
1506
1507 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1508 // set_use_compressed_oops().
1509 void Arguments::set_use_compressed_klass_ptrs() {
1510 #ifndef ZERO
1511 #ifdef _LP64
1512 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1513 if (!UseCompressedOops) {
1514 if (UseCompressedClassPointers) {
1515 warning("UseCompressedClassPointers requires UseCompressedOops");
1516 }
1517 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1518 } else {
1519 // Turn on UseCompressedClassPointers too
1520 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1521 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1522 }
1523 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1524 if (UseCompressedClassPointers) {
1525 size_t min_metaspace_sz = InitialBootClassLoaderMetaspaceSize +
1526 (64 * K * HeapWordSize); // MediumChunk in bytes.
1527
1528 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1529 if (min_metaspace_sz >= MaxMetaspaceSize) {
1530 vm_exit_during_initialization(
1531 "InitialBootClassLoaderMetaspaceSize should be "
1532 "less than MaxMetaspaceSize.");
1533 } else {
1534 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1535 MaxMetaspaceSize - min_metaspace_sz);
1536 }
1537 }
1538
1539 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1540 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1541 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1542 }
1543 }
1544 }
1545 #endif // _LP64
1546 #endif // !ZERO
1547 }
1548
1549 void Arguments::set_conservative_max_heap_alignment() {
1550 // The conservative maximum required alignment for the heap is the maximum of
1551 // the alignments imposed by several sources: any requirements from the heap
1552 // itself, the collector policy and the maximum page size we may run the VM
1553 // with.
1554 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1555 #if INCLUDE_ALL_GCS
1556 if (UseParallelGC) {
1557 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1558 } else if (UseG1GC) {
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