/*******************************************************************************
* Copyright (c) 2015 Ericsson
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Khouzam - Initial API and implementation
*******************************************************************************/
package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers;
import java.util.List;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.tracecompass.analysis.os.linux.core.kernel.StateValues;
import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue;
import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
/**
* Soft Irq exit handler
*/
public class SoftIrqExitHandler extends KernelEventHandler {
/**
* Constructor
*
* @param layout
* event layout
*/
public SoftIrqExitHandler(IKernelAnalysisEventLayout layout) {
super(layout);
}
@Override
public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException {
Integer cpu = KernelEventHandlerUtils.getCpu(event);
if (cpu == null) {
return;
}
Integer softIrqId = ((Long) event.getContent().getField(getLayout().fieldVec()).getValue()).intValue();
int currentThreadNode = KernelEventHandlerUtils.getCurrentThreadNode(cpu, ss);
/* Put this SoftIRQ back to inactive (= -1) in the resource tree */
int quark = ss.getQuarkRelativeAndAdd(KernelEventHandlerUtils.getNodeSoftIRQs(cpu, ss), softIrqId.toString());
long timestamp = KernelEventHandlerUtils.getTimestamp(event);
if (isSoftIrqRaised(ss.queryOngoingState(quark))) {
ss.modifyAttribute(timestamp, StateValues.SOFT_IRQ_RAISED_VALUE, quark);
} else {
ss.modifyAttribute(timestamp, TmfStateValue.nullValue(), quark);
}
List<Integer> softIrqs = ss.getSubAttributes(ss.getParentAttributeQuark(quark), false);
/* Only set status to running and no exit if ALL softirqs are exited. */
for (Integer softIrq : softIrqs) {
if (!ss.queryOngoingState(softIrq).isNull()) {
return;
}
}
/* Set the previous process back to running */
KernelEventHandlerUtils.setProcessToRunning(timestamp, currentThreadNode, ss);
/* Set the CPU status back to "busy" or "idle" */
KernelEventHandlerUtils.cpuExitInterrupt(timestamp, cpu, ss);
}
/**
* This checks if the running <stong>bit</strong> is set
*
* @param state
* the state to check
* @return true if in a softirq. The softirq may be pre-empted by an irq
*/
private static boolean isSoftIrqRaised(@Nullable ITmfStateValue state) {
return (state != null &&
!state.isNull() &&
(state.unboxInt() & StateValues.CPU_STATUS_SOFT_IRQ_RAISED) == StateValues.CPU_STATUS_SOFT_IRQ_RAISED);
}
}