src/hotspot/share/gc/z/zPageTable.cpp
author pliden
Wed, 13 Mar 2019 11:31:00 +0100
changeset 54094 ed3c6f07faab
parent 50525 767cdb97f103
child 54095 8b4a1177202d
permissions -rw-r--r--
8219633: ZGC: Rename ZPageSizeMin to ZGranuleSize Reviewed-by: eosterlund, stefank
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     1
/*
54094
ed3c6f07faab 8219633: ZGC: Rename ZPageSizeMin to ZGranuleSize
pliden
parents: 50525
diff changeset
     2
 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     3
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     4
 *
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     5
 * This code is free software; you can redistribute it and/or modify it
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     6
 * under the terms of the GNU General Public License version 2 only, as
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     7
 * published by the Free Software Foundation.
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     8
 *
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
     9
 * This code is distributed in the hope that it will be useful, but WITHOUT
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    10
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    11
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    12
 * version 2 for more details (a copy is included in the LICENSE file that
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    13
 * accompanied this code).
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    14
 *
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    15
 * You should have received a copy of the GNU General Public License version
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    16
 * 2 along with this work; if not, write to the Free Software Foundation,
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    17
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    18
 *
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    19
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    20
 * or visit www.oracle.com if you need additional information or have any
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    21
 * questions.
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    22
 */
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    23
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    24
#include "precompiled.hpp"
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    25
#include "gc/z/zPage.inline.hpp"
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    26
#include "gc/z/zPageTable.inline.hpp"
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    27
#include "runtime/orderAccess.hpp"
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    28
#include "utilities/debug.hpp"
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    29
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    30
ZPageTable::ZPageTable() :
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    31
    _map() {}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    32
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    33
ZPageTableEntry ZPageTable::get_entry(ZPage* page) const {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    34
  const uintptr_t addr = ZAddress::good(page->start());
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    35
  return _map.get(addr);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    36
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    37
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    38
void ZPageTable::put_entry(ZPage* page, ZPageTableEntry entry) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    39
  // Make sure a newly created page is globally visible before
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    40
  // updating the pagetable.
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    41
  OrderAccess::storestore();
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    42
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    43
  const uintptr_t start = ZAddress::good(page->start());
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    44
  const uintptr_t end = start + page->size();
54094
ed3c6f07faab 8219633: ZGC: Rename ZPageSizeMin to ZGranuleSize
pliden
parents: 50525
diff changeset
    45
  for (uintptr_t addr = start; addr < end; addr += ZGranuleSize) {
50525
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    46
    _map.put(addr, entry);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    47
  }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    48
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    49
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    50
void ZPageTable::insert(ZPage* page) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    51
  assert(get_entry(page).page() == NULL ||
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    52
         get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    53
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    54
  // Cached pages stays in the pagetable and we must not re-insert
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    55
  // those when they get re-allocated because they might also be
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    56
  // relocating and we don't want to clear their relocating bit.
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    57
  if (get_entry(page).page() == NULL) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    58
    ZPageTableEntry entry(page, false /* relocating */);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    59
    put_entry(page, entry);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    60
  }
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    61
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    62
  assert(get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    63
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    64
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    65
void ZPageTable::remove(ZPage* page) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    66
  assert(get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    67
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    68
  ZPageTableEntry entry;
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    69
  put_entry(page, entry);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    70
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    71
  assert(get_entry(page).page() == NULL, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    72
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    73
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    74
void ZPageTable::set_relocating(ZPage* page) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    75
  assert(get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    76
  assert(!get_entry(page).relocating(), "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    77
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    78
  ZPageTableEntry entry(page, true /* relocating */);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    79
  put_entry(page, entry);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    80
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    81
  assert(get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    82
  assert(get_entry(page).relocating(), "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    83
}
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    84
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    85
void ZPageTable::clear_relocating(ZPage* page) {
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    86
  assert(get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    87
  assert(get_entry(page).relocating(), "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    88
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    89
  ZPageTableEntry entry(page, false /* relocating */);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    90
  put_entry(page, entry);
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    91
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    92
  assert(get_entry(page).page() == page, "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    93
  assert(!get_entry(page).relocating(), "Invalid entry");
767cdb97f103 8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
pliden
parents:
diff changeset
    94
}