| /******************************************************************************* |
| * Copyright (c) 2018 École Polytechnique de Montréal |
| * |
| * All rights reserved. This program and the accompanying materials are |
| * made available under the terms of the Eclipse Public License 2.0 which |
| * accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| *******************************************************************************/ |
| |
| package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers; |
| |
| import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout; |
| import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.Attributes; |
| import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder; |
| import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException; |
| import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; |
| import org.eclipse.tracecompass.tmf.core.event.ITmfEventField; |
| |
| /** |
| * Handles a CPU frequency change event |
| * |
| * @author Geneviève Bastien |
| */ |
| public class CpuFrequencyHandler extends KernelEventHandler { |
| |
| private static final String CPU_ID_FIELD = "cpu_id"; //$NON-NLS-1$ |
| private static final String CPU_STATE = "state"; //$NON-NLS-1$ |
| private static final long FREQUENCY_MULTIPLIER = 1000; |
| |
| /** |
| * Constructor |
| * |
| * @param layout The event layout |
| */ |
| public CpuFrequencyHandler(IKernelAnalysisEventLayout layout) { |
| super(layout); |
| } |
| |
| @Override |
| public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException { |
| ITmfEventField content = event.getContent(); |
| Integer cpuId = content.getFieldValue(Integer.class, CPU_ID_FIELD); |
| Long cpuState = content.getFieldValue(Long.class, CPU_STATE); |
| long timestamp = KernelEventHandlerUtils.getTimestamp(event); |
| |
| if (cpuId == null || cpuState == null) { |
| // Wrong data, nothing to do |
| return; |
| } |
| |
| // Multiply cpu state by frequency multiplier |
| cpuState *= FREQUENCY_MULTIPLIER; |
| final int cpuQuark = KernelEventHandlerUtils.getCurrentCPUNode(cpuId, ss); |
| int quark = ss.getQuarkRelativeAndAdd(cpuQuark, Attributes.CURRENT_FREQUENCY); |
| ss.modifyAttribute(timestamp, cpuState, quark); |
| |
| // Set the minimum and maximum CPU frequency for this CPU |
| // Minimum value |
| quark = ss.getQuarkRelativeAndAdd(cpuQuark, Attributes.MIN_FREQUENCY); |
| Object currentValue = ss.queryOngoing(quark); |
| Long minVal = (!(currentValue instanceof Long)) ? cpuState : Long.min(cpuState, (Long) currentValue); |
| ss.updateOngoingState(minVal, quark); |
| |
| // Maximum value |
| quark = ss.getQuarkRelativeAndAdd(cpuQuark, Attributes.MAX_FREQUENCY); |
| currentValue = ss.queryOngoing(quark); |
| Long maxVal = (!(currentValue instanceof Long)) ? cpuState : Long.max(cpuState, (Long) currentValue); |
| ss.updateOngoingState(maxVal, quark); |
| } |
| |
| } |