src/hotspot/share/memory/virtualspace.hpp
author redestad
Thu, 20 Dec 2018 19:44:08 +0100
changeset 53091 5bf5b773fc41
parent 49621 5ef28d560b6f
child 53149 259c36ef27df
permissions -rw-r--r--
8215555: TieredCompilation C2 threads can excessively block handshakes Reviewed-by: kvn, neliasso, rehn
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/*
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 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
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#define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
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#include "utilities/globalDefinitions.hpp"
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// ReservedSpace is a data structure for reserving a contiguous address range.
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class ReservedSpace {
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  friend class VMStructs;
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 protected:
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  char*  _base;
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  size_t _size;
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  size_t _noaccess_prefix;
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  size_t _alignment;
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  bool   _special;
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  int    _fd_for_heap;
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 private:
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  bool   _executable;
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  // ReservedSpace
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  ReservedSpace(char* base, size_t size, size_t alignment, bool special,
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                bool executable);
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 protected:
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  void initialize(size_t size, size_t alignment, bool large,
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                  char* requested_address,
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                  bool executable);
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  // Constructor
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  ReservedSpace();
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  // Initialize the reserved space with the given size. If preferred_page_size
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  // is set, use this as minimum page size/alignment. This may waste some space
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  // if the given size is not aligned to that value, as the reservation will be
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  // aligned up to the final alignment in this case.
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  ReservedSpace(size_t size, size_t preferred_page_size = 0);
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  ReservedSpace(size_t size, size_t alignment, bool large,
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                char* requested_address = NULL);
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  ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
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  // Accessors
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  char*  base()            const { return _base;      }
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  size_t size()            const { return _size;      }
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  char*  end()             const { return _base + _size; }
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  size_t alignment()       const { return _alignment; }
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  bool   special()         const { return _special;   }
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  bool   executable()      const { return _executable;   }
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  size_t noaccess_prefix() const { return _noaccess_prefix;   }
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  bool is_reserved()       const { return _base != NULL; }
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  void release();
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  // Splitting
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  ReservedSpace first_part(size_t partition_size, size_t alignment,
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                           bool split = false, bool realloc = true);
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  ReservedSpace last_part (size_t partition_size, size_t alignment);
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  // These simply call the above using the default alignment.
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  inline ReservedSpace first_part(size_t partition_size,
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                                  bool split = false, bool realloc = true);
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  inline ReservedSpace last_part (size_t partition_size);
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  // Alignment
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  static size_t page_align_size_up(size_t size);
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  static size_t page_align_size_down(size_t size);
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  static size_t allocation_align_size_up(size_t size);
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  static size_t allocation_align_size_down(size_t size);
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  bool contains(const void* p) const {
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    return (base() <= ((char*)p)) && (((char*)p) < (base() + size()));
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  }
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};
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ReservedSpace
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ReservedSpace::first_part(size_t partition_size, bool split, bool realloc)
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{
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  return first_part(partition_size, alignment(), split, realloc);
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}
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ReservedSpace ReservedSpace::last_part(size_t partition_size)
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{
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  return last_part(partition_size, alignment());
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}
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// Class encapsulating behavior specific of memory space reserved for Java heap.
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class ReservedHeapSpace : public ReservedSpace {
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 private:
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  void try_reserve_heap(size_t size, size_t alignment, bool large,
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                        char *requested_address);
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  void try_reserve_range(char *highest_start, char *lowest_start,
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                         size_t attach_point_alignment, char *aligned_HBMA,
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                         char *upper_bound, size_t size, size_t alignment, bool large);
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  void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
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  // Create protection page at the beginning of the space.
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  void establish_noaccess_prefix();
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 public:
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  // Constructor. Tries to find a heap that is good for compressed oops.
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  // heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated
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  // on the device which is managed by the file system where the directory resides.
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  ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = NULL);
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  // Returns the base to be used for compression, i.e. so that null can be
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  // encoded safely and implicit null checks can work.
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  char *compressed_oop_base() { return _base - _noaccess_prefix; }
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};
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// Class encapsulating behavior specific memory space for Code
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class ReservedCodeSpace : public ReservedSpace {
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  // Constructor
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  ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
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};
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// VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
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class VirtualSpace {
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  friend class VMStructs;
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  // Reserved area
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  char* _low_boundary;
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  char* _high_boundary;
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  // Committed area
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  char* _low;
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  char* _high;
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  // The entire space has been committed and pinned in memory, no
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  // os::commit_memory() or os::uncommit_memory().
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  bool _special;
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  // Need to know if commit should be executable.
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  bool   _executable;
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  // MPSS Support
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  // Each virtualspace region has a lower, middle, and upper region.
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  // Each region has an end boundary and a high pointer which is the
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  // high water mark for the last allocated byte.
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  // The lower and upper unaligned to LargePageSizeInBytes uses default page.
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  // size.  The middle region uses large page size.
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  char* _lower_high;
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  char* _middle_high;
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  char* _upper_high;
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  char* _lower_high_boundary;
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  char* _middle_high_boundary;
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  char* _upper_high_boundary;
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  size_t _lower_alignment;
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  size_t _middle_alignment;
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  size_t _upper_alignment;
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  // MPSS Accessors
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  char* lower_high() const { return _lower_high; }
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  char* middle_high() const { return _middle_high; }
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  char* upper_high() const { return _upper_high; }
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  char* lower_high_boundary() const { return _lower_high_boundary; }
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  char* middle_high_boundary() const { return _middle_high_boundary; }
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  char* upper_high_boundary() const { return _upper_high_boundary; }
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  size_t lower_alignment() const { return _lower_alignment; }
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  size_t middle_alignment() const { return _middle_alignment; }
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  size_t upper_alignment() const { return _upper_alignment; }
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 public:
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  // Committed area
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  char* low()  const { return _low; }
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  char* high() const { return _high; }
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  // Reserved area
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  char* low_boundary()  const { return _low_boundary; }
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  char* high_boundary() const { return _high_boundary; }
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#if INCLUDE_AOT
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  // Set boundaries for code section in AOT library.
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  void set_low_boundary(char *p)  { _low_boundary = p; }
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  void set_high_boundary(char *p) { _high_boundary = p; }
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  void set_low(char *p)           { _low = p; }
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  void set_high(char *p)          { _high = p; }
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#endif
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  bool special() const { return _special; }
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 public:
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  // Initialization
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  VirtualSpace();
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  bool initialize_with_granularity(ReservedSpace rs, size_t committed_byte_size, size_t max_commit_ganularity);
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  bool initialize(ReservedSpace rs, size_t committed_byte_size);
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  // Destruction
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  ~VirtualSpace();
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  // Reserved memory
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  size_t reserved_size() const;
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  // Actually committed OS memory
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  size_t actual_committed_size() const;
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  // Memory used/expanded in this virtual space
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  size_t committed_size() const;
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  // Memory left to use/expand in this virtual space
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  size_t uncommitted_size() const;
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  bool   contains(const void* p) const;
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  // Operations
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  // returns true on success, false otherwise
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  bool expand_by(size_t bytes, bool pre_touch = false);
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  void shrink_by(size_t bytes);
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  void release();
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  void check_for_contiguity() PRODUCT_RETURN;
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  // Debugging
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  void print_on(outputStream* out) PRODUCT_RETURN;
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  void print();
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};
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#endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP