1 /* 2 * Copyright (c) 2016, 2018, 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 */ 23 24 #include "precompiled.hpp" 25 #include "gc/z/zPage.inline.hpp" 26 #include "gc/z/zPhysicalMemory.inline.hpp" 27 #include "gc/z/zPreMappedMemory.inline.hpp" 28 #include "gc/z/zVirtualMemory.inline.hpp" 29 #include "logging/log.hpp" 30 31 ZPreMappedMemory::ZPreMappedMemory(ZVirtualMemoryManager &vmm, ZPhysicalMemoryManager &pmm, size_t size) : 32 _vmem(), 33 _pmem(), 34 _initialized(false) { 35 if (!vmm.is_initialized() || !pmm.is_initialized()) { 36 // Not initialized 37 return; 38 } 39 40 // Pre-mapping and pre-touching memory can take a long time. Log a message 41 // to help the user understand why the JVM might seem slow to start. 42 log_info(gc, init)("Pre-touching: %s", AlwaysPreTouch ? "Enabled" : "Disabled"); 43 log_info(gc, init)("Pre-mapping: " SIZE_FORMAT "M", size / M); 44 45 if (size > 0) { 46 _pmem = pmm.alloc(size); 47 if (_pmem.is_null()) { 48 // Out of memory 49 log_error(gc, init)("Failed to pre-map Java heap (Cannot allocate physical memory)"); 50 return; 51 } 52 53 _vmem = vmm.alloc(size, true /* alloc_from_front */); 54 if (_vmem.is_null()) { 55 // Out of address space 56 log_error(gc, init)("Failed to pre-map Java heap (Cannot allocate virtual memory)"); 57 pmm.free(_pmem); 58 return; 59 } 60 61 // Map physical memory 62 pmm.map(_pmem, _vmem.start()); 63 } 64 65 _initialized = true; 66 } 67 68 ZPage* ZPreMappedMemory::alloc_page(uint8_t type, size_t size) { 69 if (size > available()) { 70 // Not enough pre-mapped memory 71 return NULL; 72 } 73 74 // Take a chunk of the pre-mapped memory 75 const ZPhysicalMemory pmem = _pmem.split(size); 76 const ZVirtualMemory vmem = _vmem.split(size); 77 78 ZPage* const page = new ZPage(type, vmem, pmem); 79 page->set_pre_mapped(); 80 81 return page; 82 } 83 84 void ZPreMappedMemory::clear() { 85 assert(_pmem.is_null(), "Should be detached"); 86 _vmem.clear(); 87 }