709 #ifdef _LP64
710 return true;
711 #else
712 if (bytes < 2 * G) {
713 return true;
714 }
715
716 char* addr = reserve_memory(bytes, NULL);
717
718 if (addr != NULL) {
719 release_memory(addr, bytes);
720 }
721
722 return addr != NULL;
723 #endif // _LP64
724 }
725
726 ///////////////////////////////////////////////////////////////////////////////
727 // thread stack
728
729 size_t os::Linux::min_stack_allowed = 128 * K;
730
731 // return default stack size for thr_type
732 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
733 // default stack size (compiler thread needs larger stack)
734 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
735 return s;
736 }
737
738 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
739 // Creating guard page is very expensive. Java thread has HotSpot
740 // guard page, only enable glibc guard page for non-Java threads.
741 return (thr_type == java_thread ? 0 : page_size());
742 }
743
744 #ifndef PRODUCT
745 void os::verify_stack_alignment() {
746 }
747 #endif
748
749 int os::extra_bang_size_in_bytes() {
750 // SPARC does not require the additional stack bang.
751 return 0;
752 }
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709 #ifdef _LP64
710 return true;
711 #else
712 if (bytes < 2 * G) {
713 return true;
714 }
715
716 char* addr = reserve_memory(bytes, NULL);
717
718 if (addr != NULL) {
719 release_memory(addr, bytes);
720 }
721
722 return addr != NULL;
723 #endif // _LP64
724 }
725
726 ///////////////////////////////////////////////////////////////////////////////
727 // thread stack
728
729 size_t os::Posix::_compiler_thread_min_stack_allowed = 128 * K;
730 size_t os::Posix::_java_thread_min_stack_allowed = 128 * K;
731 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
732
733 // return default stack size for thr_type
734 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
735 // default stack size (compiler thread needs larger stack)
736 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
737 return s;
738 }
739
740 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
741 // Creating guard page is very expensive. Java thread has HotSpot
742 // guard page, only enable glibc guard page for non-Java threads.
743 return (thr_type == java_thread ? 0 : page_size());
744 }
745
746 #ifndef PRODUCT
747 void os::verify_stack_alignment() {
748 }
749 #endif
750
751 int os::extra_bang_size_in_bytes() {
752 // SPARC does not require the additional stack bang.
753 return 0;
754 }
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