src/hotspot/os/linux/os_linux.cpp

*** 3456,3466 ****
  struct bitmask* os::Linux::_numa_all_nodes_ptr;
  struct bitmask* os::Linux::_numa_nodes_ptr;
  struct bitmask* os::Linux::_numa_interleave_bitmask;
  struct bitmask* os::Linux::_numa_membind_bitmask;
  
! bool os::pd_uncommit_memory(char* addr, size_t size) {
    uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
                                       MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
    return res  != (uintptr_t) MAP_FAILED;
  }
  
--- 3456,3466 ----
  struct bitmask* os::Linux::_numa_all_nodes_ptr;
  struct bitmask* os::Linux::_numa_nodes_ptr;
  struct bitmask* os::Linux::_numa_interleave_bitmask;
  struct bitmask* os::Linux::_numa_membind_bitmask;
  
! bool os::pd_uncommit_memory(char* addr, size_t size, bool exec) {
    uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
                                       MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
    return res  != (uintptr_t) MAP_FAILED;
  }
  
*** 3641,3651 ****
  
    if (os::is_primordial_thread()) {
      return ::munmap(addr, size) == 0;
    }
  
!   return os::uncommit_memory(addr, size);
  }
  
  // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
  // at 'requested_addr'. If there are existing memory mappings at the same
  // location, however, they will be overwritten. If 'fixed' is false,
--- 3641,3651 ----
  
    if (os::is_primordial_thread()) {
      return ::munmap(addr, size) == 0;
    }
  
!   return os::uncommit_memory(addr, size, !ExecMem);
  }
  
  // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
  // at 'requested_addr'. If there are existing memory mappings at the same
  // location, however, they will be overwritten. If 'fixed' is false,
*** 3716,3726 ****
  static int anon_munmap(char * addr, size_t size) {
    return ::munmap(addr, size) == 0;
  }
  
  char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
!                             size_t alignment_hint) {
    return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
  }
  
  bool os::pd_release_memory(char* addr, size_t size) {
    return anon_munmap(addr, size);
--- 3716,3727 ----
  static int anon_munmap(char * addr, size_t size) {
    return ::munmap(addr, size) == 0;
  }
  
  char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
!                             size_t alignment_hint,
!                             bool executable) {
    return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
  }
  
  bool os::pd_release_memory(char* addr, size_t size) {
    return anon_munmap(addr, size);