analysis/org.eclipse.tracecompass.analysis.os.linux.core/src/org/eclipse/tracecompass/internal/analysis/os/linux/core/kernel/handlers/SchedWakeupHandler.java

   1 /*******************************************************************************
   2  * Copyright (c) 2015 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *    Matthew Khouzam - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers;
  14
  15 import org.eclipse.tracecompass.analysis.os.linux.core.kernel.StateValues;
  16 import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
  17 import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.Attributes;
  18 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
  19 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  20 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  21 import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue;
  22 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  23
  24 /**
  25  * Wakeup handler
  26  */
  27 public class SchedWakeupHandler extends KernelEventHandler {
  28
  29     /**
  30      * Constructor
  31      * @param layout event layout
  32      */
  33     public SchedWakeupHandler(IKernelAnalysisEventLayout layout) {
  34         super(layout);
  35     }
  36
  37     @Override
  38     public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException {
  39         Integer cpu = KernelEventHandlerUtils.getCpu(event);
  40         final int tid = ((Long) event.getContent().getField(getLayout().fieldTid()).getValue()).intValue();
  41         final int prio = ((Long) event.getContent().getField(getLayout().fieldPrio()).getValue()).intValue();
  42         Long targetCpu = event.getContent().getFieldValue(Long.class, getLayout().fieldTargetCpu());
  43
  44         String threadAttributeName = Attributes.buildThreadAttributeName(tid, cpu);
  45
  46         if (cpu == null || targetCpu == null || threadAttributeName == null) {
  47             return;
  48         }
  49
  50         final int threadNode = ss.getQuarkRelativeAndAdd(KernelEventHandlerUtils.getNodeThreads(ss), threadAttributeName);
  51
  52         /*
  53          * The process indicated in the event's payload is now ready to run.
  54          * Assign it to the "wait for cpu" state, but only if it was not already
  55          * running.
  56          */
  57         int status = ss.queryOngoingState(threadNode).unboxInt();
  58         ITmfStateValue value = null;
  59         long timestamp = KernelEventHandlerUtils.getTimestamp(event);
  60         if (status != StateValues.PROCESS_STATUS_RUN_SYSCALL &&
  61                 status != StateValues.PROCESS_STATUS_RUN_USERMODE) {
  62             value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
  63             ss.modifyAttribute(timestamp, value, threadNode);
  64         }
  65
  66         /* Set the thread's target run queue */
  67         int quark = ss.getQuarkRelativeAndAdd(threadNode, Attributes.CURRENT_CPU_RQ);
  68         value = TmfStateValue.newValueInt(targetCpu.intValue());
  69         ss.modifyAttribute(timestamp, value, quark);
  70
  71         /*
  72          * When a user changes a threads prio (e.g. with pthread_setschedparam),
  73          * it shows in ftrace with a sched_wakeup.
  74          */
  75         quark = ss.getQuarkRelativeAndAdd(threadNode, Attributes.PRIO);
  76         value = TmfStateValue.newValueInt(prio);
  77         ss.modifyAttribute(timestamp, value, quark);
  78     }
  79 }