analysis/org.eclipse.tracecompass.analysis.os.linux.core/src/org/eclipse/tracecompass/analysis/os/linux/core/kernel/KernelTidAspect.java

   1 /*******************************************************************************
   2  * Copyright (c) 2015 École Polytechnique de Montréal
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Geneviève Bastien - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.analysis.os.linux.core.kernel;
  14
  15 import org.eclipse.jdt.annotation.Nullable;
  16 import org.eclipse.tracecompass.analysis.os.linux.core.event.aspect.LinuxTidAspect;
  17 import org.eclipse.tracecompass.analysis.os.linux.core.tid.TidAnalysisModule;
  18 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  19 import org.eclipse.tracecompass.tmf.core.event.aspect.TmfCpuAspect;
  20 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceUtils;
  21
  22 /**
  23  * This aspect finds the ID of the thread running from this event using the
  24  * {@link KernelAnalysisModule}.
  25  *
  26  * @author Geneviève Bastien
  27  * @since 2.0
  28  */
  29 public final class KernelTidAspect extends LinuxTidAspect {
  30
  31     /** The singleton instance */
  32     public static final KernelTidAspect INSTANCE = new KernelTidAspect();
  33
  34     private KernelTidAspect() {
  35     }
  36
  37     @Override
  38     public @Nullable Integer resolve(ITmfEvent event) {
  39         /* Find the CPU this event is run on */
  40         Integer cpu = TmfTraceUtils.resolveIntEventAspectOfClassForEvent(event.getTrace(),
  41                 TmfCpuAspect.class, event);
  42         if (cpu == null) {
  43             return null;
  44         }
  45
  46         /* Find the analysis module for the trace */
  47         TidAnalysisModule analysis = TmfTraceUtils.getAnalysisModuleOfClass(event.getTrace(),
  48                 TidAnalysisModule.class, TidAnalysisModule.ID);
  49         if (analysis == null) {
  50             return null;
  51         }
  52         return analysis.getThreadOnCpuAtTime(cpu, event.getTimestamp().toNanos());
  53     }
  54
  55 }