2514
2515 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems.
2516 #ifndef MADV_HUGEPAGE
2517 #define MADV_HUGEPAGE 14
2518 #endif
2519
2520 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2521 bool exec) {
2522 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
2523 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2524 uintptr_t res =
2525 (uintptr_t) ::mmap(addr, size, prot,
2526 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB,
2527 -1, 0);
2528 if (res != (uintptr_t) MAP_FAILED) {
2529 if (UseNUMAInterleaving) {
2530 numa_make_global(addr, size);
2531 }
2532 return true;
2533 }
2534 return false;
2535 }
2536
2537 return commit_memory(addr, size, exec);
2538 }
2539
2540 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2541 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
2542 // We don't check the return value: madvise(MADV_HUGEPAGE) may not
2543 // be supported or the memory may already be backed by huge pages.
2544 ::madvise(addr, bytes, MADV_HUGEPAGE);
2545 }
2546 }
2547
2548 void os::free_memory(char *addr, size_t bytes) {
2549 commit_memory(addr, bytes, false);
2550 }
2551
2552 void os::numa_make_global(char *addr, size_t bytes) {
2553 Linux::numa_interleave_memory(addr, bytes);
2554 }
2555
2556 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2557 Linux::numa_tonode_memory(addr, bytes, lgrp_hint);
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2514
2515 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems.
2516 #ifndef MADV_HUGEPAGE
2517 #define MADV_HUGEPAGE 14
2518 #endif
2519
2520 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2521 bool exec) {
2522 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
2523 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2524 uintptr_t res =
2525 (uintptr_t) ::mmap(addr, size, prot,
2526 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB,
2527 -1, 0);
2528 if (res != (uintptr_t) MAP_FAILED) {
2529 if (UseNUMAInterleaving) {
2530 numa_make_global(addr, size);
2531 }
2532 return true;
2533 }
2534 // Fall through and try to use small pages
2535 }
2536
2537 if (commit_memory(addr, size, exec)) {
2538 realign_memory(addr, size, alignment_hint);
2539 return true;
2540 }
2541 return false;
2542 }
2543
2544 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2545 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
2546 // We don't check the return value: madvise(MADV_HUGEPAGE) may not
2547 // be supported or the memory may already be backed by huge pages.
2548 ::madvise(addr, bytes, MADV_HUGEPAGE);
2549 }
2550 }
2551
2552 void os::free_memory(char *addr, size_t bytes) {
2553 commit_memory(addr, bytes, false);
2554 }
2555
2556 void os::numa_make_global(char *addr, size_t bytes) {
2557 Linux::numa_interleave_memory(addr, bytes);
2558 }
2559
2560 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2561 Linux::numa_tonode_memory(addr, bytes, lgrp_hint);
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