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| 1 | +/* |
| 2 | + * Copyright (c) 2022, 2022, Oracle and/or its affiliates. All rights reserved. |
| 3 | + * Copyright (c) 2022, 2022, Red Hat Inc. All rights reserved. |
| 4 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | + * |
| 6 | + * This code is free software; you can redistribute it and/or modify it |
| 7 | + * under the terms of the GNU General Public License version 2 only, as |
| 8 | + * published by the Free Software Foundation. Oracle designates this |
| 9 | + * particular file as subject to the "Classpath" exception as provided |
| 10 | + * by Oracle in the LICENSE file that accompanied this code. |
| 11 | + * |
| 12 | + * This code is distributed in the hope that it will be useful, but WITHOUT |
| 13 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 15 | + * version 2 for more details (a copy is included in the LICENSE file that |
| 16 | + * accompanied this code). |
| 17 | + * |
| 18 | + * You should have received a copy of the GNU General Public License version |
| 19 | + * 2 along with this work; if not, write to the Free Software Foundation, |
| 20 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | + * |
| 22 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 23 | + * or visit www.oracle.com if you need additional information or have any |
| 24 | + * questions. |
| 25 | + */ |
| 26 | +package com.oracle.svm.core.genscavenge; |
| 27 | + |
| 28 | +import org.graalvm.nativeimage.Platform; |
| 29 | +import org.graalvm.nativeimage.Platforms; |
| 30 | +import org.graalvm.nativeimage.StackValue; |
| 31 | +import org.graalvm.word.UnsignedWord; |
| 32 | + |
| 33 | +import com.oracle.svm.core.annotate.Uninterruptible; |
| 34 | +import com.oracle.svm.core.jfr.JfrBuffer; |
| 35 | +import com.oracle.svm.core.jfr.JfrEnabled; |
| 36 | +import com.oracle.svm.core.jfr.JfrEvents; |
| 37 | +import com.oracle.svm.core.jfr.JfrNativeEventWriter; |
| 38 | +import com.oracle.svm.core.jfr.JfrNativeEventWriterData; |
| 39 | +import com.oracle.svm.core.jfr.JfrNativeEventWriterDataAccess; |
| 40 | +import com.oracle.svm.core.jfr.JfrThreadLocal; |
| 41 | +import com.oracle.svm.core.jfr.JfrTicks; |
| 42 | +import com.oracle.svm.core.jfr.SubstrateJVM; |
| 43 | +import com.oracle.svm.core.util.VMError; |
| 44 | + |
| 45 | +class JfrGCEventSupport { |
| 46 | + public static final int MAX_PHASE_LEVEL = 4; |
| 47 | + private static int currentPhase; |
| 48 | + |
| 49 | + @Platforms(Platform.HOSTED_ONLY.class) |
| 50 | + JfrGCEventSupport() { |
| 51 | + } |
| 52 | + |
| 53 | + public static long startGCPhasePause() { |
| 54 | + if (!JfrEnabled.get()) { |
| 55 | + return 0; |
| 56 | + } |
| 57 | + pushPausePhaseLevel(); |
| 58 | + return JfrTicks.elapsedTicks(); |
| 59 | + } |
| 60 | + |
| 61 | + @Uninterruptible(reason = "Accesses a JFR buffer.") |
| 62 | + public static void emitGCPhasePauseEvent(UnsignedWord gcEpoch, String name, long startTicks) { |
| 63 | + if (!JfrEnabled.get()) { |
| 64 | + return; |
| 65 | + } |
| 66 | + |
| 67 | + int level = popPausePhaseLevel(); |
| 68 | + JfrEvents event = getGCPhasePauseEvent(level); |
| 69 | + if (SubstrateJVM.isRecording() && SubstrateJVM.get().isEnabled(event)) { |
| 70 | + long end = JfrTicks.elapsedTicks(); |
| 71 | + JfrBuffer buffer = ((JfrThreadLocal) SubstrateJVM.getThreadLocal()).getNativeBuffer(); |
| 72 | + JfrNativeEventWriterData data = StackValue.get(JfrNativeEventWriterData.class); |
| 73 | + JfrNativeEventWriterDataAccess.initialize(data, buffer); |
| 74 | + |
| 75 | + JfrNativeEventWriter.beginEventWrite(data, false); |
| 76 | + JfrNativeEventWriter.putLong(data, event.getId()); |
| 77 | + JfrNativeEventWriter.putLong(data, startTicks); |
| 78 | + JfrNativeEventWriter.putLong(data, end - startTicks); |
| 79 | + JfrNativeEventWriter.putEventThread(data); |
| 80 | + JfrNativeEventWriter.putLong(data, gcEpoch.rawValue()); |
| 81 | + JfrNativeEventWriter.putString(data, name); |
| 82 | + JfrNativeEventWriter.endEventWrite(data, false); |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true) |
| 87 | + private static JfrEvents getGCPhasePauseEvent(int level) { |
| 88 | + switch (level) { |
| 89 | + case 0: |
| 90 | + return JfrEvents.GCPhasePauseEvent; |
| 91 | + case 1: |
| 92 | + return JfrEvents.GCPhasePauseLevel1Event; |
| 93 | + case 2: |
| 94 | + return JfrEvents.GCPhasePauseLevel2Event; |
| 95 | + case 3: |
| 96 | + return JfrEvents.GCPhasePauseLevel3Event; |
| 97 | + case 4: |
| 98 | + return JfrEvents.GCPhasePauseLevel4Event; |
| 99 | + default: |
| 100 | + throw VMError.shouldNotReachHere("At most " + MAX_PHASE_LEVEL + " levels"); |
| 101 | + } |
| 102 | + } |
| 103 | + |
| 104 | + private static void pushPausePhaseLevel() { |
| 105 | + assert currentPhase < MAX_PHASE_LEVEL; |
| 106 | + currentPhase++; |
| 107 | + } |
| 108 | + |
| 109 | + @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true) |
| 110 | + private static int popPausePhaseLevel() { |
| 111 | + assert currentPhase > 0; |
| 112 | + currentPhase--; |
| 113 | + return currentPhase; |
| 114 | + } |
| 115 | +} |
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