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/*******************************************************************************
* 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 v1.0 which
* accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.tracecompass.incubator.internal.virtual.machine.analysis.core.overhead.handlers;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.tracecompass.analysis.os.linux.core.model.HostThread;
import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
import org.eclipse.tracecompass.incubator.analysis.core.model.IHostModel;
import org.eclipse.tracecompass.incubator.analysis.core.model.ModelManager;
import org.eclipse.tracecompass.incubator.callstack.core.instrumented.statesystem.InstrumentedCallStackAnalysis;
import org.eclipse.tracecompass.incubator.internal.virtual.machine.analysis.core.IVirtualMachineEventHandler;
import org.eclipse.tracecompass.incubator.internal.virtual.machine.analysis.core.model.IVirtualEnvironmentModel;
import org.eclipse.tracecompass.incubator.internal.virtual.machine.analysis.core.model.VirtualCPU;
import org.eclipse.tracecompass.incubator.internal.virtual.machine.analysis.core.model.VirtualMachine;
import org.eclipse.tracecompass.incubator.internal.virtual.machine.analysis.core.overhead.VmOverheadStateProvider;
import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
/**
* Handle events coming from a qemu/kvm hypervisor
*
* @author Geneviève Bastien
*/
public class QemuKvmEventHandler implements IVirtualMachineEventHandler {
private static final String FIELD_EXIT_REASON = "exit_reason"; //$NON-NLS-1$
private final Map<IKernelAnalysisEventLayout, Set<String>> fRequiredEvents = new HashMap<>();
private final VmOverheadStateProvider fProvider;
/**
* Constructor
*
* @param provider
* The state provider
*/
public QemuKvmEventHandler(VmOverheadStateProvider provider) {
fProvider = provider;
}
@Override
public Set<String> getRequiredEvents(IKernelAnalysisEventLayout layout) {
Set<String> events = fRequiredEvents.get(layout);
if (events == null) {
events = new HashSet<>();
events.addAll(layout.eventsKVMEntry());
events.addAll(layout.eventsKVMExit());
fRequiredEvents.put(layout, events);
}
return events;
}
/**
* Handle the event for a Qemu/kvm model
*
* @param ss
* The state system builder to fill
* @param event
* The event to handle
*/
@Override
public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event, IVirtualEnvironmentModel virtEnv, IKernelAnalysisEventLayout layout) {
String eventName = event.getName();
long ts = event.getTimestamp().toNanos();
if (layout.eventsKVMEntry().contains(eventName)) {
// The vcpu is exiting hypervisor mode
handleKvmEvent(ss, ts, event, virtEnv, null, null);
} else if (layout.eventsKVMExit().contains(eventName)) {
// The vcpu is entering hypervisor mode
Long exitReason = event.getContent().getFieldValue(Long.class, FIELD_EXIT_REASON);
handleKvmEvent(ss, ts, event, virtEnv, VmOverheadStateProvider.STATUS_VMM_MODE, String.valueOf(exitReason));
}
}
private void handleKvmEvent(ITmfStateSystemBuilder ss, long ts, ITmfEvent event, IVirtualEnvironmentModel virtEnv, @Nullable Object level2, @Nullable Object level3) {
HostThread ht = IVirtualMachineEventHandler.getCurrentHostThread(event, ts);
if (ht == null) {
return;
}
VirtualCPU vcpu = virtEnv.getVirtualCpu(event, ht);
if (vcpu == null) {
// The current thread has a vcpu configured, ignore
return;
}
VirtualMachine vm = vcpu.getVm();
IHostModel model = ModelManager.getModelFor(vm.getHostId());
int guestTid = model.getThreadOnCpu(vcpu.getCpuId().intValue(), ts);
if (guestTid != IHostModel.UNKNOWN_TID) {
int quark = ss.getQuarkAbsoluteAndAdd(VmOverheadStateProvider.TRACES, vm.getTraceName(), VmOverheadStateProvider.THREADS, VmOverheadStateProvider.buildThreadAttributeName(guestTid, vcpu.getCpuId().intValue()), InstrumentedCallStackAnalysis.CALL_STACK);
// Just make sure this attribute exists, at the beginning of trace or if lost
// events, it may not
ss.getQuarkRelativeAndAdd(quark, VmOverheadStateProvider.LEVEL_1);
int tidQuark = ss.getQuarkRelativeAndAdd(quark, VmOverheadStateProvider.LEVEL_1);
if (ss.queryOngoing(tidQuark) == null) {
HostThread hostThread = new HostThread(event.getTrace().getHostId(), guestTid);
fProvider.createGuestThreadStatus(ss, hostThread, ts, tidQuark);
}
int preemptQuark = ss.getQuarkRelativeAndAdd(quark, VmOverheadStateProvider.LEVEL_2);
ss.modifyAttribute(ts, level2, preemptQuark);
int statusQuark = ss.getQuarkRelativeAndAdd(quark, VmOverheadStateProvider.LEVEL_3);
ss.modifyAttribute(ts, level3, statusQuark);
}
}
}
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