ergo.c revision 2362
0N/A/*
2362N/A * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/A/* This file houses the common methods for VM ergonomics the platforms
0N/A * are split into ergo_sparc and ergo_x86, and they could be split more
0N/A * in the future if required. The following comments are not entirely
0N/A * true after bifurcation of the platform specific files.
0N/A */
0N/A
0N/A/*
0N/A * The following methods (down to ServerClassMachine()) answer
0N/A * the question about whether a machine is a "server-class"
0N/A * machine. A server-class machine is loosely defined as one
0N/A * with 2 or more processors and 2 gigabytes or more physical
0N/A * memory. The definition of a processor is a physical package,
0N/A * not a hyperthreaded chip masquerading as a multi-processor.
0N/A * The definition of memory is also somewhat fuzzy, since x86
0N/A * machines seem not to report all the memory in their DIMMs, we
0N/A * think because of memory mapping of graphics cards, etc.
0N/A *
0N/A * This code is somewhat more confused with #ifdef's than we'd
0N/A * like because this file is used by both Solaris and Linux
0N/A * platforms, and so needs to be parameterized for SPARC and
0N/A * i586 hardware. The other Linux platforms (amd64 and ia64)
0N/A * don't even ask this question, because they only come with
0N/A * server JVMs.
0N/A */
0N/A
0N/A#include "ergo.h"
0N/A
0N/A/* Dispatch to the platform-specific definition of "server-class" */
0N/Ajboolean
0N/AServerClassMachine(void) {
0N/A jboolean result;
0N/A switch(GetErgoPolicy()) {
0N/A case NEVER_SERVER_CLASS:
0N/A return JNI_FALSE;
0N/A case ALWAYS_SERVER_CLASS:
0N/A return JNI_TRUE;
0N/A default:
0N/A result = ServerClassMachineImpl();
0N/A JLI_TraceLauncher("ServerClassMachine: returns default value of %s\n",
0N/A (result == JNI_TRUE ? "true" : "false"));
0N/A return result;
0N/A }
0N/A}
0N/A
0N/A
0N/A/* Compute physical memory by asking the OS */
0N/Auint64_t
0N/Aphysical_memory(void) {
0N/A const uint64_t pages = (uint64_t) sysconf(_SC_PHYS_PAGES);
0N/A const uint64_t page_size = (uint64_t) sysconf(_SC_PAGESIZE);
0N/A const uint64_t result = pages * page_size;
0N/A# define UINT64_FORMAT "%" PRIu64
0N/A
0N/A JLI_TraceLauncher("pages: " UINT64_FORMAT
0N/A " page_size: " UINT64_FORMAT
0N/A " physical memory: " UINT64_FORMAT " (%.3fGB)\n",
0N/A pages, page_size, result, result / (double) GB);
0N/A return result;
0N/A}