ergo.c revision 4680
4632N/A * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. 4632N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4632N/A * This code is free software; you can redistribute it and/or modify it 4632N/A * under the terms of the GNU General Public License version 2 only, as 4632N/A * published by the Free Software Foundation. Oracle designates this 4632N/A * particular file as subject to the "Classpath" exception as provided 4632N/A * by Oracle in the LICENSE file that accompanied this code. 4632N/A * This code is distributed in the hope that it will be useful, but WITHOUT 4632N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 4632N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 4632N/A * version 2 for more details (a copy is included in the LICENSE file that 4632N/A * You should have received a copy of the GNU General Public License version 4632N/A * 2 along with this work; if not, write to the Free Software Foundation, 4632N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 4632N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 4632N/A/* This file houses the common methods for VM ergonomics the platforms 4632N/A * are split into ergo_sparc and ergo_x86, and they could be split more 4632N/A * in the future if required. The following comments are not entirely 4632N/A * true after bifurcation of the platform specific files. 4632N/A * The following methods (down to ServerClassMachine()) answer 4632N/A * the question about whether a machine is a "server-class" 4632N/A * machine. A server-class machine is loosely defined as one 4632N/A * with 2 or more processors and 2 gigabytes or more physical 4632N/A * memory. The definition of a processor is a physical package, 4632N/A * not a hyperthreaded chip masquerading as a multi-processor. 4632N/A * The definition of memory is also somewhat fuzzy, since x86 4632N/A * machines seem not to report all the memory in their DIMMs, we 4632N/A * think because of memory mapping of graphics cards, etc. 4632N/A * This code is somewhat more confused with #ifdef's than we'd 4632N/A * like because this file is used by both Solaris and Linux 4632N/A * platforms, and so needs to be parameterized for SPARC and 4632N/A * i586 hardware. The other Linux platforms (amd64 and ia64) 4632N/A * don't even ask this question, because they only come with 4632N/A/* Dispatch to the platform-specific definition of "server-class" */ /* Ask the OS how many processors there are. */ /* How big is a server class machine? */ /* Is this a server class machine? */ /* Compute physical memory by asking the OS */