src/hotspot/os/posix/os_posix.cpp

*** 241,252 ****
  // Map the given address range to the provided file descriptor.
  char* os::map_memory_to_file(char* base, size_t size, int fd) {
    assert(fd != -1, "File descriptor is not valid");
  
    // allocate space for the file
!   if (util_posix_fallocate(fd, 0, (off_t)size) != 0) {
!     vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory."));
      return NULL;
    }
  
    int prot = PROT_READ | PROT_WRITE;
    int flags = MAP_SHARED;
--- 241,253 ----
  // Map the given address range to the provided file descriptor.
  char* os::map_memory_to_file(char* base, size_t size, int fd) {
    assert(fd != -1, "File descriptor is not valid");
  
    // allocate space for the file
!   int ret = util_posix_fallocate(fd, 0, (off_t)size);
!   if (ret != 0) {
!     vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory. (%s)", os::strerror(ret)));
      return NULL;
    }
  
    int prot = PROT_READ | PROT_WRITE;
    int flags = MAP_SHARED;
*** 254,263 ****
--- 255,265 ----
      flags |= MAP_FIXED;
    }
    char* addr = (char*)mmap(base, size, prot, flags, fd, 0);
  
    if (addr == MAP_FAILED) {
+     warning("Failed mmap to file. (%s)", os::strerror(errno));
      return NULL;
    }
    if (base != NULL && addr != base) {
      if (!os::release_memory(addr, size)) {
        warning("Could not release memory on unsuccessful file mapping");