1 /* 2 * Copyright (c) 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 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "logging/log.hpp" 27 #include "runtime/globals.hpp" 28 #include "runtime/os.hpp" 29 #include "runtime/safepointMechanism.hpp" 30 #include "utilities/globalDefinitions.hpp" 31 32 void SafepointMechanism::default_initialize() { 33 const size_t page_size = os::vm_page_size(); 34 char* polling_page = os::reserve_memory(page_size, NULL, page_size); 35 os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page"); 36 bool res = os::protect_memory(polling_page, page_size, os::MEM_PROT_READ); 37 38 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 39 os::set_polling_page((address)(polling_page)); 40 } 41 42 void SafepointMechanism::initialize_serialize_page() { 43 if (!UseMembar) { 44 const size_t page_size = os::vm_page_size(); 45 char* serialize_page = os::reserve_memory(page_size, NULL, page_size); 46 os::commit_memory_or_exit(serialize_page, page_size, false, "Unable to commit memory serialization page"); 47 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(serialize_page)); 48 os::set_memory_serialize_page((address)(serialize_page)); 49 } 50 } 51 52 void SafepointMechanism::initialize() { 53 pd_initialize(); 54 initialize_serialize_page(); 55 }