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SWSLatencyAnalysis.java
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/
SWSLatencyAnalysis.java
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/*******************************************************************************
* Copyright (c) 2021 École Polytechnique de Montréal
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License 2.0 which
* accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.tracecompass.analysis.os.linux.core.swslatency;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.tracecompass.analysis.os.linux.core.model.OsStrings;
import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelTrace;
import org.eclipse.tracecompass.analysis.timing.core.segmentstore.AbstractSegmentStoreAnalysisEventBasedModule;
import org.eclipse.tracecompass.datastore.core.interval.IHTIntervalReader;
import org.eclipse.tracecompass.segmentstore.core.ISegment;
import org.eclipse.tracecompass.segmentstore.core.ISegmentStore;
import org.eclipse.tracecompass.segmentstore.core.SegmentComparators;
import org.eclipse.tracecompass.segmentstore.core.SegmentStoreFactory.SegmentStoreType;
import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
import org.eclipse.tracecompass.tmf.core.segment.ISegmentAspect;
import com.google.common.collect.ImmutableList;
/**
* This analysis module computes the latency between the sched_wakeup event and
* the sched_switch event for each thread
*
* @author Abdellah Rahmani
* @since 8.1
*/
public class SWSLatencyAnalysis extends AbstractSegmentStoreAnalysisEventBasedModule {
/**
* The ID of this analysis
*/
public static final String ID = "org.eclipse.tracecompass.analysis.os.linux.core.swslatency.sws"; //$NON-NLS-1$
private static final int VERSION = 1;
private static final Collection<ISegmentAspect> BASE_ASPECTS = ImmutableList.of(SWSThreadAspect.INSTANCE, SWSTidAspect.INSTANCE, SWSPriorityAspect.INSTANCE);
/**
* Constructor
*/
public SWSLatencyAnalysis() {
// do nothing
}
@Override
public String getId() {
return ID;
}
@Override
public Iterable<ISegmentAspect> getSegmentAspects() {
return BASE_ASPECTS;
}
@Override
protected int getVersion() {
return VERSION;
}
@Override
protected @NonNull SegmentStoreType getSegmentStoreType() {
return SegmentStoreType.OnDisk;
}
@Override
protected AbstractSegmentStoreAnalysisRequest createAnalysisRequest(ISegmentStore<ISegment> swsSegment, IProgressMonitor monitor) {
return new SWSLatencyAnalysisRequest(swsSegment, monitor);
}
@Override
protected @NonNull IHTIntervalReader<ISegment> getSegmentReader() {
return SchedWS.READER;
}
private class SWSLatencyAnalysisRequest extends AbstractSegmentStoreAnalysisRequest {
private final Map<Integer, SchedWS.InitialInfo> fOngoingSWS = new HashMap<>();
private @Nullable IKernelAnalysisEventLayout fLayout;
private final IProgressMonitor fMonitor;
public SWSLatencyAnalysisRequest(ISegmentStore<ISegment> swsSegment, IProgressMonitor monitor) {
super(swsSegment);
fMonitor = monitor;
}
@Override
public void handleData(ITmfEvent event) {
super.handleData(event);
IKernelAnalysisEventLayout layout = fLayout;
if (layout == null) {
IKernelTrace trace = (IKernelTrace) event.getTrace();
layout = trace.getKernelEventLayout();
fLayout = layout;
}
String eventName = event.getName();
if (eventName.equals(layout.eventSchedProcessWakeup()) ||
eventName.equals(layout.eventSchedProcessWakeupNew()) ||
eventName.equals(layout.eventSchedProcessWaking())) {
/* This is a sched_wakeup event */
Integer tid = event.getContent().getFieldValue(Integer.class, layout.fieldTid());
if (tid == null) {
// no information on this event/trace ?
return;
}
/* Record the event's data into the initial system call info */
long startTime = event.getTimestamp().toNanos();
String threadName = event.getContent().getFieldValue(String.class, layout.fieldComm());
if (threadName == null || "".equals(threadName)) {
threadName = "UNKNOWN"; //$NON-NLS-1$
}
SchedWS.InitialInfo newSchedWS = new SchedWS.InitialInfo(startTime, threadName.intern(), tid);
fOngoingSWS.put(tid, newSchedWS);
} else if (eventName.equals(layout.eventSchedSwitch())) {
/* This is a sched_switch event */
Integer tid = event.getContent().getFieldValue(Integer.class, layout.fieldNextTid());
if (tid == null) {
return;
}
SchedWS.InitialInfo info = fOngoingSWS.remove(tid);
if (info == null) {
/*
* We have not seen the sched_wakeup event corresponding to
* this thread (lost event, or before start of trace).
*/
return;
}
long endTime = event.getTimestamp().toNanos();
Integer priority = event.getContent().getFieldValue(Integer.class, layout.fieldNextPrio());
SchedWS swscall = new SchedWS(info, endTime, priority == null ? -1 : priority);
getSegmentStore().add(swscall);
}
}
@Override
public void handleCompleted() {
fOngoingSWS.clear();
super.handleCompleted();
}
@Override
public void handleCancel() {
fMonitor.setCanceled(true);
super.handleCancel();
}
}
private static final class SWSPriorityAspect implements ISegmentAspect {
public static final ISegmentAspect INSTANCE = new SWSPriorityAspect();
private SWSPriorityAspect() {
// Do nothing
}
@Override
public String getHelpText() {
return Messages.getMessage(Messages.SegmentAspectHelpText_SWSPrio);
}
@Override
public String getName() {
return Messages.getMessage(Messages.SegmentAspectName_SWSPrio);
}
@Override
public @Nullable Object resolve(ISegment segment) {
if (segment instanceof SchedWS) {
return ((SchedWS) segment).getPriority();
}
return EMPTY_STRING;
}
@Override
public @Nullable Comparator<?> getComparator() {
return (ISegment segment1, ISegment segment2) -> {
if (segment1 == null) {
return 1;
}
if (segment2 == null) {
return -1;
}
if (segment1 instanceof SchedWS && segment2 instanceof SchedWS) {
int res = Integer.compare(((SchedWS) segment1).getPriority(), ((SchedWS) segment2).getPriority());
return (res != 0 ? res : SegmentComparators.INTERVAL_START_COMPARATOR.thenComparing(SegmentComparators.INTERVAL_END_COMPARATOR).compare(segment1, segment2));
}
return 1;
};
}
}
private static final class SWSTidAspect implements ISegmentAspect {
public static final ISegmentAspect INSTANCE = new SWSTidAspect();
private SWSTidAspect() {
// Do nothing
}
@Override
public String getHelpText() {
return Messages.getMessage(Messages.SegmentAspectHelpText_SWSTid);
}
@Override
public String getName() {
return OsStrings.tid();
}
@Override
public @Nullable Comparator<?> getComparator() {
return (ISegment segment1, ISegment segment2) -> {
if (segment1 == null) {
return 1;
}
if (segment2 == null) {
return -1;
}
if (segment1 instanceof SchedWS && segment2 instanceof SchedWS) {
int res = Integer.compare(((SchedWS) segment1).getTid(), ((SchedWS) segment2).getTid());
return (res != 0 ? res : SegmentComparators.INTERVAL_START_COMPARATOR.thenComparing(SegmentComparators.INTERVAL_END_COMPARATOR).compare(segment1, segment2));
}
return 0;
};
}
@Override
public @Nullable Integer resolve(ISegment segment) {
if (segment instanceof SchedWS) {
return ((SchedWS) segment).getTid();
}
return -1;
}
}
private static final class SWSThreadAspect implements ISegmentAspect {
public static final ISegmentAspect INSTANCE = new SWSThreadAspect();
private SWSThreadAspect() {
// Do nothing
}
@Override
public String getHelpText() {
return Messages.getMessage(Messages.SegmentAspectHelpText_SWSTid);
}
@Override
public String getName() {
return OsStrings.execName();
}
@Override
public @Nullable Comparator<?> getComparator() {
return (ISegment segment1, ISegment segment2) -> {
if (segment1 == null) {
return 1;
}
if (segment2 == null) {
return -1;
}
if (segment1 instanceof SchedWS && segment2 instanceof SchedWS) {
int res = ((SchedWS) segment1).getName().compareToIgnoreCase(((SchedWS) segment2).getName());
return (res != 0 ? res : SegmentComparators.INTERVAL_START_COMPARATOR.thenComparing(SegmentComparators.INTERVAL_END_COMPARATOR).compare(segment1, segment2));
}
return 1;
};
}
@Override
public @Nullable String resolve(ISegment segment) {
if (segment instanceof SchedWS) {
return ((SchedWS) segment).getName();
}
return null;
}
}
}