2494 Unimplemented();
2495 return false;
2496 }
2497
2498 size_t os::large_page_size() {
2499 return _large_page_size;
2500 }
2501
2502 bool os::can_commit_large_page_memory() {
2503 // Does not matter, we do not support huge pages.
2504 return false;
2505 }
2506
2507 bool os::can_execute_large_page_memory() {
2508 // Does not matter, we do not support huge pages.
2509 return false;
2510 }
2511
2512 // Reserve memory at an arbitrary address, only if that area is
2513 // available (and not reserved for something else).
2514 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2515 char* addr = NULL;
2516
2517 // Always round to os::vm_page_size(), which may be larger than 4K.
2518 bytes = align_size_up(bytes, os::vm_page_size());
2519
2520 // In 4K mode always use mmap.
2521 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2522 if (os::vm_page_size() == 4*K) {
2523 return reserve_mmaped_memory(bytes, requested_addr, 0);
2524 } else {
2525 if (bytes >= Use64KPagesThreshold) {
2526 return reserve_shmated_memory(bytes, requested_addr, 0);
2527 } else {
2528 return reserve_mmaped_memory(bytes, requested_addr, 0);
2529 }
2530 }
2531
2532 return addr;
2533 }
2534
2535 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2536 return ::read(fd, buf, nBytes);
2537 }
2538
2539 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2540 return ::pread(fd, buf, nBytes, offset);
2541 }
2542
2543 void os::naked_short_sleep(jlong ms) {
2544 struct timespec req;
2545
|
2494 Unimplemented();
2495 return false;
2496 }
2497
2498 size_t os::large_page_size() {
2499 return _large_page_size;
2500 }
2501
2502 bool os::can_commit_large_page_memory() {
2503 // Does not matter, we do not support huge pages.
2504 return false;
2505 }
2506
2507 bool os::can_execute_large_page_memory() {
2508 // Does not matter, we do not support huge pages.
2509 return false;
2510 }
2511
2512 // Reserve memory at an arbitrary address, only if that area is
2513 // available (and not reserved for something else).
2514 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, bool use_SHM) {
2515 char* addr = NULL;
2516
2517 // Always round to os::vm_page_size(), which may be larger than 4K.
2518 bytes = align_size_up(bytes, os::vm_page_size());
2519
2520 // In 4K mode always use mmap.
2521 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2522 if (os::vm_page_size() == 4*K) {
2523 return reserve_mmaped_memory(bytes, requested_addr, 0);
2524 } else {
2525 if (use_SHM && bytes >= Use64KPagesThreshold) {
2526 return reserve_shmated_memory(bytes, requested_addr, 0);
2527 } else {
2528 return reserve_mmaped_memory(bytes, requested_addr, 0);
2529 }
2530 }
2531
2532 return addr;
2533 }
2534
2535 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2536 return ::read(fd, buf, nBytes);
2537 }
2538
2539 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2540 return ::pread(fd, buf, nBytes, offset);
2541 }
2542
2543 void os::naked_short_sleep(jlong ms) {
2544 struct timespec req;
2545
|