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src/hotspot/share/gc/z/zPageTable.cpp

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   1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */


  25 #include "gc/z/zPage.inline.hpp"
  26 #include "gc/z/zPageTable.inline.hpp"
  27 #include "runtime/orderAccess.hpp"
  28 #include "utilities/debug.hpp"
  29 
  30 ZPageTable::ZPageTable() :
  31     _map() {}
  32 
  33 ZPageTableEntry ZPageTable::get_entry(ZPage* page) const {
  34   const uintptr_t addr = ZAddress::good(page->start());
  35   return _map.get(addr);
  36 }
  37 
  38 void ZPageTable::put_entry(ZPage* page, ZPageTableEntry entry) {
  39   // Make sure a newly created page is globally visible before
  40   // updating the pagetable.
  41   OrderAccess::storestore();
  42 
  43   const uintptr_t start = ZAddress::good(page->start());
  44   const uintptr_t end = start + page->size();
  45   for (uintptr_t addr = start; addr < end; addr += ZPageSizeMin) {
  46     _map.put(addr, entry);
  47   }
  48 }
  49 
  50 void ZPageTable::insert(ZPage* page) {
  51   assert(get_entry(page).page() == NULL ||
  52          get_entry(page).page() == page, "Invalid entry");
  53 
  54   // Cached pages stays in the pagetable and we must not re-insert
  55   // those when they get re-allocated because they might also be
  56   // relocating and we don't want to clear their relocating bit.
  57   if (get_entry(page).page() == NULL) {
  58     ZPageTableEntry entry(page, false /* relocating */);
  59     put_entry(page, entry);
  60   }
  61 
  62   assert(get_entry(page).page() == page, "Invalid entry");
  63 }
  64 
  65 void ZPageTable::remove(ZPage* page) {


   1 /*
   2  * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */


  25 #include "gc/z/zPage.inline.hpp"
  26 #include "gc/z/zPageTable.inline.hpp"
  27 #include "runtime/orderAccess.hpp"
  28 #include "utilities/debug.hpp"
  29 
  30 ZPageTable::ZPageTable() :
  31     _map() {}
  32 
  33 ZPageTableEntry ZPageTable::get_entry(ZPage* page) const {
  34   const uintptr_t addr = ZAddress::good(page->start());
  35   return _map.get(addr);
  36 }
  37 
  38 void ZPageTable::put_entry(ZPage* page, ZPageTableEntry entry) {
  39   // Make sure a newly created page is globally visible before
  40   // updating the pagetable.
  41   OrderAccess::storestore();
  42 
  43   const uintptr_t start = ZAddress::good(page->start());
  44   const uintptr_t end = start + page->size();
  45   for (uintptr_t addr = start; addr < end; addr += ZGranuleSize) {
  46     _map.put(addr, entry);
  47   }
  48 }
  49 
  50 void ZPageTable::insert(ZPage* page) {
  51   assert(get_entry(page).page() == NULL ||
  52          get_entry(page).page() == page, "Invalid entry");
  53 
  54   // Cached pages stays in the pagetable and we must not re-insert
  55   // those when they get re-allocated because they might also be
  56   // relocating and we don't want to clear their relocating bit.
  57   if (get_entry(page).page() == NULL) {
  58     ZPageTableEntry entry(page, false /* relocating */);
  59     put_entry(page, entry);
  60   }
  61 
  62   assert(get_entry(page).page() == page, "Invalid entry");
  63 }
  64 
  65 void ZPageTable::remove(ZPage* page) {


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