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annotate src/os/linux/vm/dtraceJSDT_linux.cpp @ 12832:263f2c796d6c

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8024838: Significant slowdown due to transparent huge pages Summary: Don't turn on transparent huge pages (-XX:+UseTransparentHugePages) unless explicitly specified on the command line. This has the effect that large pages are never turned on Linux unless the user has explicitly enabled any of the large pages flags: -XX:+UseLargePages, -XX:+UseTransparentHugePages, -XX:+UseHugeTLBFS, and -XX:+UseSHM. Reviewed-by: jwilhelm, tschatzl, brutisso
author stefank
date Sat, 05 Oct 2013 10:14:58 +0200
parents f95d63e2154a
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1 /*
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
018d5b58dd4f 6537506: Provide a mechanism for specifying Java-level USDT-like dtrace probes
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/javaClasses.hpp"
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27 #include "code/codeBlob.hpp"
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28 #include "memory/allocation.hpp"
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29 #include "prims/jvm.h"
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30 #include "runtime/dtraceJSDT.hpp"
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31 #include "runtime/jniHandles.hpp"
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32 #include "runtime/os.hpp"
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33 #include "runtime/signature.hpp"
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34 #include "utilities/globalDefinitions.hpp"
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35
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36 int DTraceJSDT::pd_activate(
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37 void* baseAddress, jstring module,
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38 jint providers_count, JVM_DTraceProvider* providers) {
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39 return -1;
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40 }
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41
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42 void DTraceJSDT::pd_dispose(int handle) {
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43 }
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44
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45 jboolean DTraceJSDT::pd_is_supported() {
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46 return false;
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47 }