src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp
author dsamersoff
Tue, 14 May 2019 21:36:09 +0300
changeset 54848 5d8c5c7bca95
parent 54832 0eee5adb22d7
child 54956 43340a79840d
permissions -rw-r--r--
8223767: Shenandoah fails to build on Solaris x86_64 Summary: Trivial changes to make Solaris Studio 12.4 happy Reviewed-by: shade, rkennke Contributed-by: boris.ulasevich@bell-sw.com
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/*
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 * Copyright (c) 2013, 2018, Red Hat, Inc. All rights reserved.
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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_GC_SHENANDOAH_SHENANDOAHHEAPREGION_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGION_HPP
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#include "gc/shared/space.hpp"
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#include "gc/shenandoah/shenandoahAllocRequest.hpp"
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#include "gc/shenandoah/shenandoahAsserts.hpp"
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#include "gc/shenandoah/shenandoahHeap.hpp"
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#include "gc/shenandoah/shenandoahPacer.hpp"
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#include "utilities/sizes.hpp"
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class VMStructs;
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class ShenandoahHeapRegion : public ContiguousSpace {
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  friend class VMStructs;
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private:
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  /*
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    Region state is described by a state machine. Transitions are guarded by
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    heap lock, which allows changing the state of several regions atomically.
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    Region states can be logically aggregated in groups.
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      "Empty":
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      .................................................................
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      .                                                               .
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      .                                                               .
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      .         Uncommitted  <-------  Committed <------------------------\
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      .              |                     |                          .   |
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      .              \---------v-----------/                          .   |
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      .                        |                                      .   |
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      .........................|.......................................   |
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                               |                                          |
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      "Active":                |                                          |
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      .........................|.......................................   |
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      .                        |                                      .   |
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      .      /-----------------^-------------------\                  .   |
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      .      |                                     |                  .   |
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      .      v                                     v    "Humongous":  .   |
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      .   Regular ---\-----\     ..................O................  .   |
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      .     |  ^     |     |     .                 |               .  .   |
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      .     |  |     |     |     .                 *---------\     .  .   |
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      .     v  |     |     |     .                 v         v     .  .   |
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      .    Pinned  Cset    |     .  HStart <--> H/Start   H/Cont   .  .   |
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      .       ^    / |     |     .  Pinned         v         |     .  .   |
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      .       |   /  |     |     .                 *<--------/     .  .   |
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      .       |  v   |     |     .                 |               .  .   |
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      .  CsetPinned  |     |     ..................O................  .   |
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      .              |     |                       |                  .   |
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      .              \-----\---v-------------------/                  .   |
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      .                        |                                      .   |
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      .........................|.......................................   |
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                               |                                          |
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      "Trash":                 |                                          |
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      .........................|.......................................   |
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      .                        |                                      .   |
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      .                        v                                      .   |
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      .                      Trash ---------------------------------------/
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      .                                                               .
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      .                                                               .
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      .................................................................
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    Transition from "Empty" to "Active" is first allocation. It can go from {Uncommitted, Committed}
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    to {Regular, "Humongous"}. The allocation may happen in Regular regions too, but not in Humongous.
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    Transition from "Active" to "Trash" is reclamation. It can go from CSet during the normal cycle,
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    and from {Regular, "Humongous"} for immediate reclamation. The existence of Trash state allows
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    quick reclamation without actual cleaning up.
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    Transition from "Trash" to "Empty" is recycling. It cleans up the regions and corresponding metadata.
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    Can be done asynchronously and in bulk.
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    Note how internal transitions disallow logic bugs:
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      a) No region can go Empty, unless properly reclaimed/recycled;
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      b) No region can go Uncommitted, unless reclaimed/recycled first;
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      c) Only Regular regions can go to CSet;
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      d) Pinned cannot go Trash, thus it could never be reclaimed until unpinned;
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      e) Pinned cannot go CSet, thus it never moves;
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      f) Humongous cannot be used for regular allocations;
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      g) Humongous cannot go CSet, thus it never moves;
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      h) Humongous start can go pinned, and thus can be protected from moves (humongous continuations should
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         follow associated humongous starts, not pinnable/movable by themselves);
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      i) Empty cannot go Trash, avoiding useless work;
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      j) ...
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   */
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  enum RegionState {
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    _empty_uncommitted,       // region is empty and has memory uncommitted
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    _empty_committed,         // region is empty and has memory committed
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    _regular,                 // region is for regular allocations
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    _humongous_start,         // region is the humongous start
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    _humongous_cont,          // region is the humongous continuation
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    _pinned_humongous_start,  // region is both humongous start and pinned
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    _cset,                    // region is in collection set
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    _pinned,                  // region is pinned
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    _pinned_cset,             // region is pinned and in cset (evac failure path)
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    _trash                    // region contains only trash
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  };
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  const char* region_state_to_string(RegionState s) const {
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    switch (s) {
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      case _empty_uncommitted:       return "Empty Uncommitted";
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      case _empty_committed:         return "Empty Committed";
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      case _regular:                 return "Regular";
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      case _humongous_start:         return "Humongous Start";
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      case _humongous_cont:          return "Humongous Continuation";
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      case _pinned_humongous_start:  return "Humongous Start, Pinned";
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      case _cset:                    return "Collection Set";
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      case _pinned:                  return "Pinned";
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      case _pinned_cset:             return "Collection Set, Pinned";
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      case _trash:                   return "Trash";
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      default:
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        ShouldNotReachHere();
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        return "";
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    }
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  }
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  // This method protects from accidental changes in enum order:
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  int region_state_to_ordinal(RegionState s) const {
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    switch (s) {
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      case _empty_uncommitted:      return 0;
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      case _empty_committed:        return 1;
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      case _regular:                return 2;
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      case _humongous_start:        return 3;
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      case _humongous_cont:         return 4;
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      case _cset:                   return 5;
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      case _pinned:                 return 6;
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      case _trash:                  return 7;
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      case _pinned_cset:            return 8;
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      case _pinned_humongous_start: return 9;
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      default:
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        ShouldNotReachHere();
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        return -1;
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    }
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  }
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  void report_illegal_transition(const char* method);
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public:
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  // Allowed transitions from the outside code:
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  void make_regular_allocation();
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  void make_regular_bypass();
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  void make_humongous_start();
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  void make_humongous_cont();
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  void make_humongous_start_bypass();
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  void make_humongous_cont_bypass();
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  void make_pinned();
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  void make_unpinned();
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  void make_cset();
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  void make_trash();
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  void make_trash_immediate();
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  void make_empty();
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  void make_uncommitted();
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  void make_committed_bypass();
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  // Individual states:
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  bool is_empty_uncommitted()      const { return _state == _empty_uncommitted; }
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  bool is_empty_committed()        const { return _state == _empty_committed; }
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  bool is_regular()                const { return _state == _regular; }
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  bool is_humongous_continuation() const { return _state == _humongous_cont; }
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  // Participation in logical groups:
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  bool is_empty()                  const { return is_empty_committed() || is_empty_uncommitted(); }
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  bool is_active()                 const { return !is_empty() && !is_trash(); }
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  bool is_trash()                  const { return _state == _trash; }
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  bool is_humongous_start()        const { return _state == _humongous_start || _state == _pinned_humongous_start; }
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  bool is_humongous()              const { return is_humongous_start() || is_humongous_continuation(); }
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  bool is_committed()              const { return !is_empty_uncommitted(); }
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  bool is_cset()                   const { return _state == _cset   || _state == _pinned_cset; }
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  bool is_pinned()                 const { return _state == _pinned || _state == _pinned_cset || _state == _pinned_humongous_start; }
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  // Macro-properties:
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  bool is_alloc_allowed()          const { return is_empty() || is_regular() || _state == _pinned; }
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  bool is_move_allowed()           const { return is_regular() || _state == _cset || (ShenandoahHumongousMoves && _state == _humongous_start); }
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  RegionState state()              const { return _state; }
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  int  state_ordinal()             const { return region_state_to_ordinal(_state); }
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private:
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  static size_t RegionCount;
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  static size_t RegionSizeBytes;
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  static size_t RegionSizeWords;
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  static size_t RegionSizeBytesShift;
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  static size_t RegionSizeWordsShift;
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  static size_t RegionSizeBytesMask;
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  static size_t RegionSizeWordsMask;
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  static size_t HumongousThresholdBytes;
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  static size_t HumongousThresholdWords;
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  static size_t MaxTLABSizeBytes;
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  static size_t MaxTLABSizeWords;
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  // Global allocation counter, increased for each allocation under Shenandoah heap lock.
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  // Padded to avoid false sharing with the read-only fields above.
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  struct PaddedAllocSeqNum {
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    DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(uint64_t));
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    uint64_t value;
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    DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
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    PaddedAllocSeqNum() {
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      // start with 1, reserve 0 for uninitialized value
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      value = 1;
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    }
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  };
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  static PaddedAllocSeqNum _alloc_seq_num;
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  // Never updated fields
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  ShenandoahHeap* _heap;
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  MemRegion _reserved;
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  size_t _region_number;
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  // Rarely updated fields
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  HeapWord* _new_top;
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  size_t _critical_pins;
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  double _empty_time;
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  // Seldom updated fields
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  RegionState _state;
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  // Frequently updated fields
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  size_t _tlab_allocs;
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  size_t _gclab_allocs;
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  size_t _shared_allocs;
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  uint64_t _seqnum_first_alloc_mutator;
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  uint64_t _seqnum_first_alloc_gc;
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  uint64_t _seqnum_last_alloc_mutator;
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  uint64_t _seqnum_last_alloc_gc;
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  volatile size_t _live_data;
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  // Claim some space at the end to protect next region
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  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, 0);
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public:
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  ShenandoahHeapRegion(ShenandoahHeap* heap, HeapWord* start, size_t size_words, size_t index, bool committed);
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  static const size_t MIN_NUM_REGIONS = 10;
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  static void setup_sizes(size_t max_heap_size);
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  double empty_time() {
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    return _empty_time;
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  }
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  inline static size_t required_regions(size_t bytes) {
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    return (bytes + ShenandoahHeapRegion::region_size_bytes() - 1) >> ShenandoahHeapRegion::region_size_bytes_shift();
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  }
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  inline static size_t region_count() {
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    return ShenandoahHeapRegion::RegionCount;
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  }
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  inline static size_t region_size_bytes() {
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    return ShenandoahHeapRegion::RegionSizeBytes;
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  }
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  inline static size_t region_size_words() {
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    return ShenandoahHeapRegion::RegionSizeWords;
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  }
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  inline static size_t region_size_bytes_shift() {
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    return ShenandoahHeapRegion::RegionSizeBytesShift;
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  }
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  inline static size_t region_size_words_shift() {
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    return ShenandoahHeapRegion::RegionSizeWordsShift;
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  }
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  inline static size_t region_size_bytes_mask() {
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    return ShenandoahHeapRegion::RegionSizeBytesMask;
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  }
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  inline static size_t region_size_words_mask() {
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    return ShenandoahHeapRegion::RegionSizeWordsMask;
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  }
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  // Convert to jint with sanity checking
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  inline static jint region_size_bytes_jint() {
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    assert (ShenandoahHeapRegion::RegionSizeBytes <= (size_t)max_jint, "sanity");
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    return (jint)ShenandoahHeapRegion::RegionSizeBytes;
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  }
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  // Convert to jint with sanity checking
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  inline static jint region_size_words_jint() {
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    assert (ShenandoahHeapRegion::RegionSizeWords <= (size_t)max_jint, "sanity");
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    return (jint)ShenandoahHeapRegion::RegionSizeWords;
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  }
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  // Convert to jint with sanity checking
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  inline static jint region_size_bytes_shift_jint() {
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    assert (ShenandoahHeapRegion::RegionSizeBytesShift <= (size_t)max_jint, "sanity");
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    return (jint)ShenandoahHeapRegion::RegionSizeBytesShift;
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  }
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  // Convert to jint with sanity checking
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  inline static jint region_size_words_shift_jint() {
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    assert (ShenandoahHeapRegion::RegionSizeWordsShift <= (size_t)max_jint, "sanity");
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    return (jint)ShenandoahHeapRegion::RegionSizeWordsShift;
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  }
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  inline static size_t humongous_threshold_bytes() {
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    return ShenandoahHeapRegion::HumongousThresholdBytes;
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  }
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  inline static size_t humongous_threshold_words() {
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    return ShenandoahHeapRegion::HumongousThresholdWords;
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  }
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  inline static size_t max_tlab_size_bytes() {
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    return ShenandoahHeapRegion::MaxTLABSizeBytes;
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  }
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  inline static size_t max_tlab_size_words() {
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    return ShenandoahHeapRegion::MaxTLABSizeWords;
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  }
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  static uint64_t seqnum_current_alloc() {
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    // Last used seq number
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    return _alloc_seq_num.value - 1;
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  }
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  size_t region_number() const;
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  // Allocation (return NULL if full)
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  inline HeapWord* allocate(size_t word_size, ShenandoahAllocRequest::Type type);
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  HeapWord* allocate(size_t word_size) shenandoah_not_implemented_return(NULL)
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  void clear_live_data();
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  void set_live_data(size_t s);
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  // Increase live data for newly allocated region
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  inline void increase_live_data_alloc_words(size_t s);
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  // Increase live data for region scanned with GC
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  inline void increase_live_data_gc_words(size_t s);
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  bool has_live() const;
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  size_t get_live_data_bytes() const;
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  size_t get_live_data_words() const;
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  void print_on(outputStream* st) const;
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  size_t garbage() const;
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  void recycle();
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  void oop_iterate(OopIterateClosure* cl);
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  HeapWord* block_start_const(const void* p) const;
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  bool in_collection_set() const;
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  // Find humongous start region that this region belongs to
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  ShenandoahHeapRegion* humongous_start_region() const;
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  CompactibleSpace* next_compaction_space() const shenandoah_not_implemented_return(NULL);
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  void prepare_for_compaction(CompactPoint* cp)   shenandoah_not_implemented;
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  void adjust_pointers()                          shenandoah_not_implemented;
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  void compact()                                  shenandoah_not_implemented;
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  void set_new_top(HeapWord* new_top) { _new_top = new_top; }
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  HeapWord* new_top() const { return _new_top; }
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  inline void adjust_alloc_metadata(ShenandoahAllocRequest::Type type, size_t);
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  void reset_alloc_metadata_to_shared();
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  void reset_alloc_metadata();
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  size_t get_shared_allocs() const;
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  size_t get_tlab_allocs() const;
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  size_t get_gclab_allocs() const;
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  uint64_t seqnum_first_alloc() const {
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    if (_seqnum_first_alloc_mutator == 0) return _seqnum_first_alloc_gc;
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    if (_seqnum_first_alloc_gc == 0)      return _seqnum_first_alloc_mutator;
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    return MIN2(_seqnum_first_alloc_mutator, _seqnum_first_alloc_gc);
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  }
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  uint64_t seqnum_last_alloc() const {
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    return MAX2(_seqnum_last_alloc_mutator, _seqnum_last_alloc_gc);
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  }
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  uint64_t seqnum_first_alloc_mutator() const {
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    return _seqnum_first_alloc_mutator;
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  }
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  uint64_t seqnum_last_alloc_mutator()  const {
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    return _seqnum_last_alloc_mutator;
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  }
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  uint64_t seqnum_first_alloc_gc() const {
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    return _seqnum_first_alloc_gc;
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  }
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  uint64_t seqnum_last_alloc_gc()  const {
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    return _seqnum_last_alloc_gc;
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  }
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private:
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  void do_commit();
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  void do_uncommit();
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  void oop_iterate_objects(OopIterateClosure* cl);
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  void oop_iterate_humongous(OopIterateClosure* cl);
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  inline void internal_increase_live_data(size_t s);
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};
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGION_HPP