30 private:
  31   int      _fd;
  32   size_t   _size;
  33   uint64_t _filesystem;
  34   size_t   _block_size;
  35   size_t   _available;
  36   bool     _initialized;
  37 
  38   void warn_available_space(size_t max) const;
  39   void warn_max_map_count(size_t max) const;
  40 
  41   int create_mem_fd(const char* name) const;
  42   int create_file_fd(const char* name) const;
  43   int create_fd(const char* name) const;
  44 
  45   bool is_tmpfs() const;
  46   bool is_hugetlbfs() const;
  47   bool tmpfs_supports_transparent_huge_pages() const;
  48 
  49   ZErrno fallocate_compat_ftruncate(size_t size) const;
  50   ZErrno fallocate_compat_mmap(size_t offset, size_t length, bool reserve_only) const;

  51   ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const;
  52   ZErrno fallocate_fill_hole_compat(size_t offset, size_t length);
  53   ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length);
  54   ZErrno fallocate_fill_hole(size_t offset, size_t length);
  55   ZErrno fallocate_punch_hole(size_t offset, size_t length);
  56   ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length);
  57   ZErrno fallocate(bool punch_hole, size_t offset, size_t length);
  58 
  59   bool commit_inner(size_t offset, size_t length);
  60   size_t commit_numa_interleaved(size_t offset, size_t length);
  61   size_t commit_default(size_t offset, size_t length);
  62 
  63 public:
  64   ZPhysicalMemoryBacking();
  65 
  66   bool is_initialized() const;
  67 
  68   void warn_commit_limits(size_t max) const;
  69 
  70   size_t size() const;

  30 private:
  31   int      _fd;
  32   size_t   _size;
  33   uint64_t _filesystem;
  34   size_t   _block_size;
  35   size_t   _available;
  36   bool     _initialized;
  37 
  38   void warn_available_space(size_t max) const;
  39   void warn_max_map_count(size_t max) const;
  40 
  41   int create_mem_fd(const char* name) const;
  42   int create_file_fd(const char* name) const;
  43   int create_fd(const char* name) const;
  44 
  45   bool is_tmpfs() const;
  46   bool is_hugetlbfs() const;
  47   bool tmpfs_supports_transparent_huge_pages() const;
  48 
  49   ZErrno fallocate_compat_ftruncate(size_t size) const;
  50   ZErrno fallocate_compat_mmap_hugetlbfs(size_t offset, size_t length, bool touch) const;
  51   ZErrno fallocate_compat_mmap_tmpfs(size_t offset, size_t length) const;
  52   ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const;
  53   ZErrno fallocate_fill_hole_compat(size_t offset, size_t length);
  54   ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length);
  55   ZErrno fallocate_fill_hole(size_t offset, size_t length);
  56   ZErrno fallocate_punch_hole(size_t offset, size_t length);
  57   ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length);
  58   ZErrno fallocate(bool punch_hole, size_t offset, size_t length);
  59 
  60   bool commit_inner(size_t offset, size_t length);
  61   size_t commit_numa_interleaved(size_t offset, size_t length);
  62   size_t commit_default(size_t offset, size_t length);
  63 
  64 public:
  65   ZPhysicalMemoryBacking();
  66 
  67   bool is_initialized() const;
  68 
  69   void warn_commit_limits(size_t max) const;
  70 
  71   size_t size() const;