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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 | ||
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17 | import org.eclipse.tracecompass.analysis.os.linux.core.kernel.Attributes; |
18 | import org.eclipse.tracecompass.analysis.os.linux.core.kernel.LinuxValues; | |
19 | import org.eclipse.tracecompass.analysis.os.linux.core.kernel.StateValues; | |
c8f45ad2 MK |
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 | ||
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57 | /* Will never return null since "cpu" is null checked */ |
58 | String formerThreadAttributeName = KernelEventHandlerUtils.buildThreadAttributeName(prevTid, cpu); | |
59 | String currenThreadAttributeName = KernelEventHandlerUtils.buildThreadAttributeName(nextTid, cpu); | |
60 | ||
c8f45ad2 | 61 | int nodeThreads = KernelEventHandlerUtils.getNodeThreads(ss); |
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62 | int formerThreadNode = ss.getQuarkRelativeAndAdd(nodeThreads, formerThreadAttributeName); |
63 | int newCurrentThreadNode = ss.getQuarkRelativeAndAdd(nodeThreads, currenThreadAttributeName); | |
c8f45ad2 MK |
64 | |
65 | long timestamp = KernelEventHandlerUtils.getTimestamp(event); | |
66 | /* Set the status of the process that got scheduled out. */ | |
67 | setOldProcessStatus(ss, prevState, formerThreadNode, timestamp); | |
68 | ||
69 | /* Set the status of the new scheduled process */ | |
70 | KernelEventHandlerUtils.setProcessToRunning(timestamp, newCurrentThreadNode, ss); | |
71 | ||
72 | /* Set the exec name of the new process */ | |
73 | setNewProcessExecName(ss, nextProcessName, newCurrentThreadNode, timestamp); | |
74 | ||
75 | /* Set the current prio for the new process */ | |
76 | setNewProcessPio(ss, nextPrio, newCurrentThreadNode, timestamp); | |
77 | ||
78 | /* Make sure the PPID and system_call sub-attributes exist */ | |
79 | ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.SYSTEM_CALL); | |
80 | ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.PPID); | |
81 | ||
82 | /* Set the current scheduled process on the relevant CPU */ | |
83 | int currentCPUNode = KernelEventHandlerUtils.getCurrentCPUNode(cpu, ss); | |
84 | setCpuProcess(ss, nextTid, timestamp, currentCPUNode); | |
85 | ||
86 | /* Set the status of the CPU itself */ | |
87 | setCpuStatus(ss, nextTid, newCurrentThreadNode, timestamp, currentCPUNode); | |
88 | } | |
89 | ||
90 | private static void setOldProcessStatus(ITmfStateSystemBuilder ss, Long prevState, Integer formerThreadNode, long timestamp) throws AttributeNotFoundException { | |
91 | ITmfStateValue value; | |
92 | /* | |
c422f500 MK |
93 | * Empirical observations and look into the linux code have |
94 | * shown that the TASK_STATE_MAX flag is used internally and | |
95 | * |'ed with other states, most often the running state, so it | |
96 | * is ignored from the prevState value. | |
97 | * | |
98 | * Since Linux 4.1, the TASK_NOLOAD state was created and | |
99 | * TASK_STATE_MAX is now 2048. We use TASK_NOLOAD as the new max | |
100 | * because it does not modify the displayed state value. | |
c8f45ad2 | 101 | */ |
c422f500 | 102 | int state = (int) (prevState & (LinuxValues.TASK_NOLOAD - 1)); |
c8f45ad2 | 103 | |
978a610e | 104 | if (isRunning(state)) { |
c8f45ad2 | 105 | value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE; |
978a610e | 106 | } else if (isWaiting(state)) { |
c8f45ad2 | 107 | value = StateValues.PROCESS_STATUS_WAIT_BLOCKED_VALUE; |
978a610e | 108 | } else if (isDead(state)) { |
c8f45ad2 | 109 | value = TmfStateValue.nullValue(); |
978a610e | 110 | } else { |
c8f45ad2 | 111 | value = StateValues.PROCESS_STATUS_WAIT_UNKNOWN_VALUE; |
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112 | } |
113 | int quark = ss.getQuarkRelativeAndAdd(formerThreadNode, Attributes.STATUS); | |
114 | ss.modifyAttribute(timestamp, value, quark); | |
115 | ||
116 | } | |
117 | ||
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118 | private static boolean isDead(int state) { |
119 | return (state & LinuxValues.TASK_DEAD) != 0; | |
120 | } | |
121 | ||
122 | private static boolean isWaiting(int state) { | |
123 | return (state & (LinuxValues.TASK_INTERRUPTIBLE | LinuxValues.TASK_UNINTERRUPTIBLE)) != 0; | |
124 | } | |
125 | ||
126 | private static boolean isRunning(int state) { | |
127 | // special case, this means ALL STATES ARE 0 | |
128 | // this is effectively an anti-state | |
129 | return state == 0; | |
130 | } | |
131 | ||
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132 | private static void setCpuStatus(ITmfStateSystemBuilder ss, Integer nextTid, Integer newCurrentThreadNode, long timestamp, int currentCPUNode) throws AttributeNotFoundException { |
133 | int quark; | |
134 | ITmfStateValue value; | |
135 | if (nextTid > 0) { | |
136 | /* Check if the entering process is in kernel or user mode */ | |
137 | quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.SYSTEM_CALL); | |
138 | ITmfStateValue queryOngoingState = ss.queryOngoingState(quark); | |
139 | if (queryOngoingState.isNull()) { | |
140 | value = StateValues.CPU_STATUS_RUN_USERMODE_VALUE; | |
141 | } else { | |
142 | value = StateValues.CPU_STATUS_RUN_SYSCALL_VALUE; | |
143 | } | |
144 | } else { | |
145 | value = StateValues.CPU_STATUS_IDLE_VALUE; | |
146 | } | |
147 | quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS); | |
148 | ss.modifyAttribute(timestamp, value, quark); | |
149 | } | |
150 | ||
151 | private static void setCpuProcess(ITmfStateSystemBuilder ss, Integer nextTid, long timestamp, int currentCPUNode) throws AttributeNotFoundException { | |
152 | int quark; | |
153 | ITmfStateValue value; | |
154 | quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.CURRENT_THREAD); | |
155 | value = TmfStateValue.newValueInt(nextTid); | |
156 | ss.modifyAttribute(timestamp, value, quark); | |
157 | } | |
158 | ||
159 | private static void setNewProcessPio(ITmfStateSystemBuilder ss, Integer nextPrio, Integer newCurrentThreadNode, long timestamp) throws AttributeNotFoundException { | |
160 | int quark; | |
161 | ITmfStateValue value; | |
162 | quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.PRIO); | |
163 | value = TmfStateValue.newValueInt(nextPrio); | |
164 | ss.modifyAttribute(timestamp, value, quark); | |
165 | } | |
166 | ||
167 | private static void setNewProcessExecName(ITmfStateSystemBuilder ss, String nextProcessName, Integer newCurrentThreadNode, long timestamp) throws AttributeNotFoundException { | |
168 | int quark; | |
169 | ITmfStateValue value; | |
170 | quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.EXEC_NAME); | |
171 | value = TmfStateValue.newValueString(nextProcessName); | |
172 | ss.modifyAttribute(timestamp, value, quark); | |
173 | } | |
174 | ||
175 | } |