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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.lttng.scope.lttng.kernel.core.analysis.os.handlers.internal; | |
14 | ||
15 | import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; | |
16 | import org.lttng.scope.lttng.kernel.core.analysis.os.Attributes; | |
17 | import org.lttng.scope.lttng.kernel.core.analysis.os.StateValues; | |
18 | import org.lttng.scope.lttng.kernel.core.trace.layout.ILttngKernelEventLayout; | |
19 | ||
20 | import ca.polymtl.dorsal.libdelorean.ITmfStateSystemBuilder; | |
21 | import ca.polymtl.dorsal.libdelorean.exceptions.AttributeNotFoundException; | |
22 | import ca.polymtl.dorsal.libdelorean.statevalue.ITmfStateValue; | |
23 | import ca.polymtl.dorsal.libdelorean.statevalue.TmfStateValue; | |
24 | ||
25 | /** | |
26 | * Waking/wakeup handler. | |
27 | * | |
28 | * "sched_waking" and "sched_wakeup" tracepoints contain the same fields, and | |
29 | * apply the same state transitions in our model, so they can both use this | |
30 | * handler. | |
31 | */ | |
32 | public class SchedWakeupHandler extends KernelEventHandler { | |
33 | ||
34 | /** | |
35 | * Constructor | |
36 | * @param layout event layout | |
37 | */ | |
38 | public SchedWakeupHandler(ILttngKernelEventLayout layout) { | |
39 | super(layout); | |
40 | } | |
41 | ||
42 | @Override | |
43 | public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException { | |
44 | Integer cpu = KernelEventHandlerUtils.getCpu(event); | |
45 | final int tid = ((Long) event.getContent().getField(getLayout().fieldTid()).getValue()).intValue(); | |
46 | final int prio = ((Long) event.getContent().getField(getLayout().fieldPrio()).getValue()).intValue(); | |
47 | Long targetCpu = event.getContent().getFieldValue(Long.class, getLayout().fieldTargetCpu()); | |
48 | ||
49 | String threadAttributeName = Attributes.buildThreadAttributeName(tid, cpu); | |
50 | if (cpu == null || targetCpu == null || threadAttributeName == null) { | |
51 | return; | |
52 | } | |
53 | ||
54 | final int threadNode = ss.getQuarkRelativeAndAdd(KernelEventHandlerUtils.getNodeThreads(ss), threadAttributeName); | |
55 | ||
56 | /* | |
57 | * The process indicated in the event's payload is now ready to run. | |
58 | * Assign it to the "wait for cpu" state, but only if it was not already | |
59 | * running. | |
60 | */ | |
61 | int status = ss.queryOngoingState(threadNode).unboxInt(); | |
62 | ITmfStateValue value = null; | |
63 | long timestamp = KernelEventHandlerUtils.getTimestamp(event); | |
64 | if (status != StateValues.PROCESS_STATUS_RUN_SYSCALL && | |
65 | status != StateValues.PROCESS_STATUS_RUN_USERMODE) { | |
66 | value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE; | |
67 | ss.modifyAttribute(timestamp, value, threadNode); | |
68 | } | |
69 | ||
70 | /* Set the thread's target run queue */ | |
71 | int quark = ss.getQuarkRelativeAndAdd(threadNode, Attributes.CURRENT_CPU_RQ); | |
72 | value = TmfStateValue.newValueInt(targetCpu.intValue()); | |
73 | ss.modifyAttribute(timestamp, value, quark); | |
74 | ||
75 | /* | |
76 | * When a user changes a threads prio (e.g. with pthread_setschedparam), | |
77 | * it shows in ftrace with a sched_wakeup. | |
78 | */ | |
79 | quark = ss.getQuarkRelativeAndAdd(threadNode, Attributes.PRIO); | |
80 | value = TmfStateValue.newValueInt(prio); | |
81 | ss.modifyAttribute(timestamp, value, quark); | |
82 | } | |
83 | } |