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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.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers; | |
14 | ||
15 | import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull; | |
16 | ||
17 | import org.eclipse.tracecompass.analysis.os.linux.core.kernelanalysis.Attributes; | |
18 | import org.eclipse.tracecompass.analysis.os.linux.core.kernelanalysis.LinuxValues; | |
19 | import org.eclipse.tracecompass.analysis.os.linux.core.kernelanalysis.StateValues; | |
20 | import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout; | |
21 | import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder; | |
22 | import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException; | |
23 | import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue; | |
24 | import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue; | |
25 | import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; | |
26 | import org.eclipse.tracecompass.tmf.core.event.ITmfEventField; | |
27 | ||
28 | /** | |
29 | * Scheduler switch event handler | |
30 | */ | |
31 | public class SchedSwitchHandler extends KernelEventHandler { | |
32 | ||
33 | /** | |
34 | * Constructor | |
35 | * | |
36 | * @param layout | |
37 | * event layout | |
38 | */ | |
39 | public SchedSwitchHandler(IKernelAnalysisEventLayout layout) { | |
40 | super(layout); | |
41 | } | |
42 | ||
43 | @Override | |
44 | public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException { | |
45 | Integer cpu = KernelEventHandlerUtils.getCpu(event); | |
46 | if (cpu == null) { | |
47 | return; | |
48 | } | |
49 | ||
50 | ITmfEventField content = event.getContent(); | |
51 | Integer prevTid = ((Long) content.getField(getLayout().fieldPrevTid()).getValue()).intValue(); | |
52 | Long prevState = checkNotNull((Long) content.getField(getLayout().fieldPrevState()).getValue()); | |
53 | String nextProcessName = checkNotNull((String) content.getField(getLayout().fieldNextComm()).getValue()); | |
54 | Integer nextTid = ((Long) content.getField(getLayout().fieldNextTid()).getValue()).intValue(); | |
55 | Integer nextPrio = ((Long) content.getField(getLayout().fieldNextPrio()).getValue()).intValue(); | |
56 | ||
57 | int nodeThreads = KernelEventHandlerUtils.getNodeThreads(ss); | |
58 | int formerThreadNode = ss.getQuarkRelativeAndAdd(nodeThreads, prevTid.toString()); | |
59 | int newCurrentThreadNode = ss.getQuarkRelativeAndAdd(nodeThreads, nextTid.toString()); | |
60 | ||
61 | long timestamp = KernelEventHandlerUtils.getTimestamp(event); | |
62 | /* Set the status of the process that got scheduled out. */ | |
63 | setOldProcessStatus(ss, prevState, formerThreadNode, timestamp); | |
64 | ||
65 | /* Set the status of the new scheduled process */ | |
66 | KernelEventHandlerUtils.setProcessToRunning(timestamp, newCurrentThreadNode, ss); | |
67 | ||
68 | /* Set the exec name of the new process */ | |
69 | setNewProcessExecName(ss, nextProcessName, newCurrentThreadNode, timestamp); | |
70 | ||
71 | /* Set the current prio for the new process */ | |
72 | setNewProcessPio(ss, nextPrio, newCurrentThreadNode, timestamp); | |
73 | ||
74 | /* Make sure the PPID and system_call sub-attributes exist */ | |
75 | ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.SYSTEM_CALL); | |
76 | ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.PPID); | |
77 | ||
78 | /* Set the current scheduled process on the relevant CPU */ | |
79 | int currentCPUNode = KernelEventHandlerUtils.getCurrentCPUNode(cpu, ss); | |
80 | setCpuProcess(ss, nextTid, timestamp, currentCPUNode); | |
81 | ||
82 | /* Set the status of the CPU itself */ | |
83 | setCpuStatus(ss, nextTid, newCurrentThreadNode, timestamp, currentCPUNode); | |
84 | } | |
85 | ||
86 | private static void setOldProcessStatus(ITmfStateSystemBuilder ss, Long prevState, Integer formerThreadNode, long timestamp) throws AttributeNotFoundException { | |
87 | ITmfStateValue value; | |
88 | /* | |
89 | * Empirical observations and look into the linux code have | |
90 | * shown that the TASK_STATE_MAX flag is used internally and | |
91 | * |'ed with other states, most often the running state, so it | |
92 | * is ignored from the prevState value. | |
93 | */ | |
94 | int state = (int) (prevState & ~(LinuxValues.TASK_STATE_MAX)); | |
95 | ||
96 | switch (state) { | |
97 | case LinuxValues.TASK_STATE_RUNNING: | |
98 | value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE; | |
99 | break; | |
100 | case LinuxValues.TASK_INTERRUPTIBLE: | |
101 | case LinuxValues.TASK_UNINTERRUPTIBLE: | |
102 | value = StateValues.PROCESS_STATUS_WAIT_BLOCKED_VALUE; | |
103 | break; | |
104 | case LinuxValues.TASK_DEAD: | |
105 | value = TmfStateValue.nullValue(); | |
106 | break; | |
107 | default: | |
108 | value = StateValues.PROCESS_STATUS_WAIT_UNKNOWN_VALUE; | |
109 | break; | |
110 | } | |
111 | int quark = ss.getQuarkRelativeAndAdd(formerThreadNode, Attributes.STATUS); | |
112 | ss.modifyAttribute(timestamp, value, quark); | |
113 | ||
114 | } | |
115 | ||
116 | private static void setCpuStatus(ITmfStateSystemBuilder ss, Integer nextTid, Integer newCurrentThreadNode, long timestamp, int currentCPUNode) throws AttributeNotFoundException { | |
117 | int quark; | |
118 | ITmfStateValue value; | |
119 | if (nextTid > 0) { | |
120 | /* Check if the entering process is in kernel or user mode */ | |
121 | quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.SYSTEM_CALL); | |
122 | ITmfStateValue queryOngoingState = ss.queryOngoingState(quark); | |
123 | if (queryOngoingState.isNull()) { | |
124 | value = StateValues.CPU_STATUS_RUN_USERMODE_VALUE; | |
125 | } else { | |
126 | value = StateValues.CPU_STATUS_RUN_SYSCALL_VALUE; | |
127 | } | |
128 | } else { | |
129 | value = StateValues.CPU_STATUS_IDLE_VALUE; | |
130 | } | |
131 | quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS); | |
132 | ss.modifyAttribute(timestamp, value, quark); | |
133 | } | |
134 | ||
135 | private static void setCpuProcess(ITmfStateSystemBuilder ss, Integer nextTid, long timestamp, int currentCPUNode) throws AttributeNotFoundException { | |
136 | int quark; | |
137 | ITmfStateValue value; | |
138 | quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.CURRENT_THREAD); | |
139 | value = TmfStateValue.newValueInt(nextTid); | |
140 | ss.modifyAttribute(timestamp, value, quark); | |
141 | } | |
142 | ||
143 | private static void setNewProcessPio(ITmfStateSystemBuilder ss, Integer nextPrio, Integer newCurrentThreadNode, long timestamp) throws AttributeNotFoundException { | |
144 | int quark; | |
145 | ITmfStateValue value; | |
146 | quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.PRIO); | |
147 | value = TmfStateValue.newValueInt(nextPrio); | |
148 | ss.modifyAttribute(timestamp, value, quark); | |
149 | } | |
150 | ||
151 | private static void setNewProcessExecName(ITmfStateSystemBuilder ss, String nextProcessName, Integer newCurrentThreadNode, long timestamp) throws AttributeNotFoundException { | |
152 | int quark; | |
153 | ITmfStateValue value; | |
154 | quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.EXEC_NAME); | |
155 | value = TmfStateValue.newValueString(nextProcessName); | |
156 | ss.modifyAttribute(timestamp, value, quark); | |
157 | } | |
158 | ||
159 | } |