lttng/org.lttng.scope.lttng.kernel.core/src/org/lttng/scope/lttng/kernel/core/event/aspect/ThreadPriorityAspect.java

   1 /*******************************************************************************
   2  * Copyright (c) 2015 Keba AG
   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  *   Christian Mansky - Initial implementation
  11  *******************************************************************************/
  12
  13 package org.lttng.scope.lttng.kernel.core.event.aspect;
  14
  15 import org.eclipse.jdt.annotation.NonNull;
  16 import org.eclipse.jdt.annotation.Nullable;
  17 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  18 import org.eclipse.tracecompass.tmf.core.event.aspect.ITmfEventAspect;
  19 import org.eclipse.tracecompass.tmf.core.event.aspect.TmfCpuAspect;
  20 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  21 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceUtils;
  22 import org.lttng.scope.common.core.NonNullUtils;
  23 import org.lttng.scope.lttng.kernel.core.analysis.os.Attributes;
  24 import org.lttng.scope.lttng.kernel.core.analysis.os.KernelAnalysisModule;
  25
  26 import ca.polymtl.dorsal.libdelorean.ITmfStateSystem;
  27 import ca.polymtl.dorsal.libdelorean.exceptions.AttributeNotFoundException;
  28 import ca.polymtl.dorsal.libdelorean.exceptions.StateSystemDisposedException;
  29 import ca.polymtl.dorsal.libdelorean.exceptions.TimeRangeException;
  30 import ca.polymtl.dorsal.libdelorean.interval.ITmfStateInterval;
  31 import ca.polymtl.dorsal.libdelorean.statevalue.ITmfStateValue;
  32
  33 /**
  34  * This aspect finds the priority of the thread running from this event using
  35  * the {@link KernelAnalysisModule}.
  36  *
  37  * @author Christian Mansky
  38  */
  39 public final class ThreadPriorityAspect implements ITmfEventAspect<Integer> {
  40
  41     /** The singleton instance */
  42     public static final ThreadPriorityAspect INSTANCE = new ThreadPriorityAspect();
  43
  44     private ThreadPriorityAspect() {
  45     }
  46
  47     @Override
  48     public final String getName() {
  49         return NonNullUtils.nullToEmptyString(Messages.ThreadPriorityAspect_Name);
  50     }
  51
  52     @Override
  53     public final String getHelpText() {
  54         return NonNullUtils.nullToEmptyString(Messages.ThreadPriorityAspect_HelpText);
  55     }
  56
  57     @Override
  58     public @Nullable Integer resolve(ITmfEvent event) {
  59         final @NonNull ITmfTrace trace = event.getTrace();
  60         KernelAnalysisModule kernelAnalysis = TmfTraceUtils.getAnalysisModuleOfClass(trace, KernelAnalysisModule.class, KernelAnalysisModule.ID);
  61         if (kernelAnalysis == null) {
  62             return null;
  63         }
  64
  65         ITmfStateSystem ss = kernelAnalysis.getStateSystem();
  66         if (ss == null) {
  67             return null;
  68         }
  69
  70         Integer tid = KernelTidAspect.INSTANCE.resolve(event);
  71         if (tid == null) {
  72             return null;
  73         }
  74
  75         final long ts = event.getTimestamp().getValue();
  76         Integer execPrio = null;
  77         try {
  78             Integer cpu = 0;
  79             if (tid == 0) {
  80                 /* Find the CPU this event is run on */
  81                 cpu = TmfTraceUtils.resolveIntEventAspectOfClassForEvent(trace, TmfCpuAspect.class, event);
  82             }
  83             int execPrioQuark = ss.getQuarkAbsolute(Attributes.THREADS, Attributes.buildThreadAttributeName(tid, cpu), Attributes.PRIO);
  84             ITmfStateInterval interval = ss.querySingleState(ts, execPrioQuark);
  85             ITmfStateValue prioValue = interval.getStateValue();
  86             /* We know the prio must be an Integer */
  87             execPrio = prioValue.unboxInt();
  88         } catch (AttributeNotFoundException | StateSystemDisposedException | TimeRangeException e) {
  89         }
  90         return execPrio;
  91     }
  92 }