1518 // with.
1519 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1520 #if INCLUDE_ALL_GCS
1521 if (UseParallelGC) {
1522 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1523 } else if (UseG1GC) {
1524 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1525 }
1526 #endif // INCLUDE_ALL_GCS
1527 _conservative_max_heap_alignment = MAX4(heap_alignment,
1528 (size_t)os::vm_allocation_granularity(),
1529 os::max_page_size(),
1530 CollectorPolicy::compute_heap_alignment());
1531 }
1532
1533 void Arguments::select_gc_ergonomically() {
1534 if (os::is_server_class_machine()) {
1535 if (should_auto_select_low_pause_collector()) {
1536 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1537 } else {
1538 FLAG_SET_ERGO(bool, UseParallelGC, true);
1539 }
1540 } else {
1541 FLAG_SET_ERGO(bool, UseSerialGC, true);
1542 }
1543 }
1544
1545 void Arguments::select_gc() {
1546 if (!gc_selected()) {
1547 select_gc_ergonomically();
1548 guarantee(gc_selected(), "No GC selected");
1549 }
1550 }
1551
1552 void Arguments::set_ergonomics_flags() {
1553 select_gc();
1554
1555 #ifdef COMPILER2
1556 // Shared spaces work fine with other GCs but causes bytecode rewriting
1557 // to be disabled, which hurts interpreter performance and decreases
1558 // server performance. When -server is specified, keep the default off
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1518 // with.
1519 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1520 #if INCLUDE_ALL_GCS
1521 if (UseParallelGC) {
1522 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1523 } else if (UseG1GC) {
1524 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1525 }
1526 #endif // INCLUDE_ALL_GCS
1527 _conservative_max_heap_alignment = MAX4(heap_alignment,
1528 (size_t)os::vm_allocation_granularity(),
1529 os::max_page_size(),
1530 CollectorPolicy::compute_heap_alignment());
1531 }
1532
1533 void Arguments::select_gc_ergonomically() {
1534 if (os::is_server_class_machine()) {
1535 if (should_auto_select_low_pause_collector()) {
1536 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1537 } else {
1538 #if defined(JAVASE_EMBEDDED)
1539 FLAG_SET_ERGO(bool, UseParallelGC, true);
1540 #else
1541 FLAG_SET_ERGO(bool, UseG1GC, true);
1542 #endif
1543 }
1544 } else {
1545 FLAG_SET_ERGO(bool, UseSerialGC, true);
1546 }
1547 }
1548
1549 void Arguments::select_gc() {
1550 if (!gc_selected()) {
1551 select_gc_ergonomically();
1552 guarantee(gc_selected(), "No GC selected");
1553 }
1554 }
1555
1556 void Arguments::set_ergonomics_flags() {
1557 select_gc();
1558
1559 #ifdef COMPILER2
1560 // Shared spaces work fine with other GCs but causes bytecode rewriting
1561 // to be disabled, which hurts interpreter performance and decreases
1562 // server performance. When -server is specified, keep the default off
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