org.eclipse.tracecompass.analysis.os.linux.core/src/org/eclipse/tracecompass/internal/analysis/os/linux/core/kernelanalysis/KernelStateProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2015 Ericsson
   3  * Copyright (c) 2010, 2011 École Polytechnique de Montréal
   4  * Copyright (c) 2010, 2011 Alexandre Montplaisir <alexandre.montplaisir@gmail.com>
   5  *
   6  * All rights reserved. This program and the accompanying materials are
   7  * made available under the terms of the Eclipse Public License v1.0 which
   8  * accompanies this distribution, and is available at
   9  * http://www.eclipse.org/legal/epl-v10.html
  10  *
  11  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernelanalysis;
  14
  15 import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull;
  16
  17 import java.util.Map;
  18
  19 import org.eclipse.jdt.annotation.Nullable;
  20 import org.eclipse.tracecompass.analysis.os.linux.core.kernelanalysis.Attributes;
  21 import org.eclipse.tracecompass.analysis.os.linux.core.kernelanalysis.StateValues;
  22 import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout;
  23 import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernelanalysis.LinuxValues;
  24 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
  25 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  26 import org.eclipse.tracecompass.statesystem.core.exceptions.StateValueTypeException;
  27 import org.eclipse.tracecompass.statesystem.core.exceptions.TimeRangeException;
  28 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  29 import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue;
  30 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  31 import org.eclipse.tracecompass.tmf.core.event.ITmfEventField;
  32 import org.eclipse.tracecompass.tmf.core.event.aspect.TmfCpuAspect;
  33 import org.eclipse.tracecompass.tmf.core.statesystem.AbstractTmfStateProvider;
  34 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  35 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceUtils;
  36
  37 import com.google.common.collect.ImmutableMap;
  38
  39 /**
  40  * This is the state change input plugin for TMF's state system which handles
  41  * the LTTng 2.0 kernel traces in CTF format.
  42  *
  43  * It uses the reference handler defined in CTFKernelHandler.java.
  44  *
  45  * @author alexmont
  46  *
  47  */
  48 public class KernelStateProvider extends AbstractTmfStateProvider {
  49
  50     // ------------------------------------------------------------------------
  51     // Static fields
  52     // ------------------------------------------------------------------------
  53
  54     /**
  55      * Version number of this state provider. Please bump this if you modify the
  56      * contents of the generated state history in some way.
  57      */
  58     private static final int VERSION = 7;
  59
  60     private static final int IRQ_HANDLER_ENTRY_INDEX = 1;
  61     private static final int IRQ_HANDLER_EXIT_INDEX = 2;
  62     private static final int SOFT_IRQ_ENTRY_INDEX = 3;
  63     private static final int SOFT_IRQ_EXIT_INDEX = 4;
  64     private static final int SOFT_IRQ_RAISE_INDEX = 5;
  65     private static final int SCHED_SWITCH_INDEX = 6;
  66     private static final int SCHED_PROCESS_FORK_INDEX = 7;
  67     private static final int SCHED_PROCESS_EXIT_INDEX = 8;
  68     private static final int SCHED_PROCESS_FREE_INDEX = 9;
  69     private static final int STATEDUMP_PROCESS_STATE_INDEX = 10;
  70     private static final int SCHED_WAKEUP_INDEX = 11;
  71     private static final int SCHED_PI_SETPRIO_INDEX = 12;
  72
  73
  74     // ------------------------------------------------------------------------
  75     // Fields
  76     // ------------------------------------------------------------------------
  77
  78     private final Map<String, Integer> fEventNames;
  79     private final IKernelAnalysisEventLayout fLayout;
  80
  81     // ------------------------------------------------------------------------
  82     // Constructor
  83     // ------------------------------------------------------------------------
  84
  85     /**
  86      * Instantiate a new state provider plugin.
  87      *
  88      * @param trace
  89      *            The LTTng 2.0 kernel trace directory
  90      * @param layout
  91      *            The event layout to use for this state provider. Usually
  92      *            depending on the tracer implementation.
  93      */
  94     public KernelStateProvider(ITmfTrace trace, IKernelAnalysisEventLayout layout) {
  95         super(trace, "Kernel"); //$NON-NLS-1$
  96         fLayout = layout;
  97         fEventNames = buildEventNames(layout);
  98     }
  99
 100     // ------------------------------------------------------------------------
 101     // Event names management
 102     // ------------------------------------------------------------------------
 103
 104     private static Map<String, Integer> buildEventNames(IKernelAnalysisEventLayout layout) {
 105         ImmutableMap.Builder<String, Integer> builder = ImmutableMap.builder();
 106
 107         builder.put(layout.eventIrqHandlerEntry(), IRQ_HANDLER_ENTRY_INDEX);
 108         builder.put(layout.eventIrqHandlerExit(), IRQ_HANDLER_EXIT_INDEX);
 109         builder.put(layout.eventSoftIrqEntry(), SOFT_IRQ_ENTRY_INDEX);
 110         builder.put(layout.eventSoftIrqExit(), SOFT_IRQ_EXIT_INDEX);
 111         builder.put(layout.eventSoftIrqRaise(), SOFT_IRQ_RAISE_INDEX);
 112         builder.put(layout.eventSchedSwitch(), SCHED_SWITCH_INDEX);
 113         builder.put(layout.eventSchedPiSetprio(), SCHED_PI_SETPRIO_INDEX);
 114         builder.put(layout.eventSchedProcessFork(), SCHED_PROCESS_FORK_INDEX);
 115         builder.put(layout.eventSchedProcessExit(), SCHED_PROCESS_EXIT_INDEX);
 116         builder.put(layout.eventSchedProcessFree(), SCHED_PROCESS_FREE_INDEX);
 117
 118         final String eventStatedumpProcessState = layout.eventStatedumpProcessState();
 119         if (eventStatedumpProcessState != null) {
 120             builder.put(eventStatedumpProcessState, STATEDUMP_PROCESS_STATE_INDEX);
 121         }
 122
 123         for (String eventSchedWakeup : layout.eventsSchedWakeup()) {
 124             builder.put(eventSchedWakeup, SCHED_WAKEUP_INDEX);
 125         }
 126
 127         return checkNotNull(builder.build());
 128     }
 129
 130     // ------------------------------------------------------------------------
 131     // IStateChangeInput
 132     // ------------------------------------------------------------------------
 133
 134     @Override
 135     public int getVersion() {
 136         return VERSION;
 137     }
 138
 139     @Override
 140     public void assignTargetStateSystem(ITmfStateSystemBuilder ssb) {
 141         /* We can only set up the locations once the state system is assigned */
 142         super.assignTargetStateSystem(ssb);
 143     }
 144
 145     @Override
 146     public KernelStateProvider getNewInstance() {
 147         return new KernelStateProvider(this.getTrace(), fLayout);
 148     }
 149
 150     @Override
 151     protected void eventHandle(@Nullable ITmfEvent event) {
 152         if (event == null) {
 153             return;
 154         }
 155
 156         Object cpuObj = TmfTraceUtils.resolveEventAspectOfClassForEvent(event.getTrace(), TmfCpuAspect.class, event);
 157         if (cpuObj == null) {
 158             /* We couldn't find any CPU information, ignore this event */
 159             return;
 160         }
 161         Integer cpu = (Integer) cpuObj;
 162
 163         final String eventName = event.getName();
 164         final long ts = event.getTimestamp().getValue();
 165
 166         try {
 167             final ITmfStateSystemBuilder ss = checkNotNull(getStateSystemBuilder());
 168
 169             /* Shortcut for the "current CPU" attribute node */
 170             final int currentCPUNode = ss.getQuarkRelativeAndAdd(getNodeCPUs(ss), cpu.toString());
 171
 172             /*
 173              * Shortcut for the "current thread" attribute node. It requires
 174              * querying the current CPU's current thread.
 175              */
 176             int quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.CURRENT_THREAD);
 177             ITmfStateValue value = ss.queryOngoingState(quark);
 178             int thread = value.isNull() ? -1 : value.unboxInt();
 179             final int currentThreadNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), String.valueOf(thread));
 180
 181             /*
 182              * Feed event to the history system if it's known to cause a state
 183              * transition.
 184              */
 185             Integer idx = fEventNames.get(eventName);
 186             int intval = (idx == null ? -1 : idx.intValue());
 187             switch (intval) {
 188
 189             case IRQ_HANDLER_ENTRY_INDEX:
 190             {
 191                 Integer irqId = ((Long) event.getContent().getField(fLayout.fieldIrq()).getValue()).intValue();
 192
 193                 /* Mark this IRQ as active in the resource tree.
 194                  * The state value = the CPU on which this IRQ is sitting */
 195                 quark = ss.getQuarkRelativeAndAdd(getNodeIRQs(ss), irqId.toString());
 196                 value = TmfStateValue.newValueInt(cpu.intValue());
 197                 ss.modifyAttribute(ts, value, quark);
 198
 199                 /* Change the status of the running process to interrupted */
 200                 quark = ss.getQuarkRelativeAndAdd(currentThreadNode, Attributes.STATUS);
 201                 value = StateValues.PROCESS_STATUS_INTERRUPTED_VALUE;
 202                 ss.modifyAttribute(ts, value, quark);
 203
 204                 /* Change the status of the CPU to interrupted */
 205                 quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS);
 206                 value = StateValues.CPU_STATUS_IRQ_VALUE;
 207                 ss.modifyAttribute(ts, value, quark);
 208             }
 209                 break;
 210
 211             case IRQ_HANDLER_EXIT_INDEX:
 212             {
 213                 Integer irqId = ((Long) event.getContent().getField(fLayout.fieldIrq()).getValue()).intValue();
 214
 215                 /* Put this IRQ back to inactive in the resource tree */
 216                 quark = ss.getQuarkRelativeAndAdd(getNodeIRQs(ss), irqId.toString());
 217                 value = TmfStateValue.nullValue();
 218                 ss.modifyAttribute(ts, value, quark);
 219
 220                 /* Set the previous process back to running */
 221                 setProcessToRunning(ss, ts, currentThreadNode);
 222
 223                 /* Set the CPU status back to running or "idle" */
 224                 cpuExitInterrupt(ss, ts, currentCPUNode, currentThreadNode);
 225             }
 226                 break;
 227
 228             case SOFT_IRQ_ENTRY_INDEX:
 229             {
 230                 Integer softIrqId = ((Long) event.getContent().getField(fLayout.fieldVec()).getValue()).intValue();
 231
 232                 /* Mark this SoftIRQ as active in the resource tree.
 233                  * The state value = the CPU on which this SoftIRQ is processed */
 234                 quark = ss.getQuarkRelativeAndAdd(getNodeSoftIRQs(ss), softIrqId.toString());
 235                 value = TmfStateValue.newValueInt(cpu.intValue());
 236                 ss.modifyAttribute(ts, value, quark);
 237
 238                 /* Change the status of the running process to interrupted */
 239                 quark = ss.getQuarkRelativeAndAdd(currentThreadNode, Attributes.STATUS);
 240                 value = StateValues.PROCESS_STATUS_INTERRUPTED_VALUE;
 241                 ss.modifyAttribute(ts, value, quark);
 242
 243                 /* Change the status of the CPU to interrupted */
 244                 quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS);
 245                 value = StateValues.CPU_STATUS_SOFTIRQ_VALUE;
 246                 ss.modifyAttribute(ts, value, quark);
 247             }
 248                 break;
 249
 250             case SOFT_IRQ_EXIT_INDEX:
 251             {
 252                 Integer softIrqId = ((Long) event.getContent().getField(fLayout.fieldVec()).getValue()).intValue();
 253
 254                 /* Put this SoftIRQ back to inactive (= -1) in the resource tree */
 255                 quark = ss.getQuarkRelativeAndAdd(getNodeSoftIRQs(ss), softIrqId.toString());
 256                 value = TmfStateValue.nullValue();
 257                 ss.modifyAttribute(ts, value, quark);
 258
 259                 /* Set the previous process back to running */
 260                 setProcessToRunning(ss, ts, currentThreadNode);
 261
 262                 /* Set the CPU status back to "busy" or "idle" */
 263                 cpuExitInterrupt(ss, ts, currentCPUNode, currentThreadNode);
 264             }
 265                 break;
 266
 267             case SOFT_IRQ_RAISE_INDEX:
 268             /* Fields: int32 vec */
 269             {
 270                 Integer softIrqId = ((Long) event.getContent().getField(fLayout.fieldVec()).getValue()).intValue();
 271
 272                 /* Mark this SoftIRQ as *raised* in the resource tree.
 273                  * State value = -2 */
 274                 quark = ss.getQuarkRelativeAndAdd(getNodeSoftIRQs(ss), softIrqId.toString());
 275                 value = StateValues.SOFT_IRQ_RAISED_VALUE;
 276                 ss.modifyAttribute(ts, value, quark);
 277             }
 278                 break;
 279
 280             case SCHED_SWITCH_INDEX:
 281             {
 282                 ITmfEventField content = event.getContent();
 283                 Integer prevTid = ((Long) content.getField(fLayout.fieldPrevTid()).getValue()).intValue();
 284                 Long prevState = (Long) content.getField(fLayout.fieldPrevState()).getValue();
 285                 String nextProcessName = (String) content.getField(fLayout.fieldNextComm()).getValue();
 286                 Integer nextTid = ((Long) content.getField(fLayout.fieldNextTid()).getValue()).intValue();
 287                 Integer nextPrio = ((Long) content.getField(fLayout.fieldNextPrio()).getValue()).intValue();
 288
 289                 Integer formerThreadNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), prevTid.toString());
 290                 Integer newCurrentThreadNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), nextTid.toString());
 291
 292                 /* Set the status of the process that got scheduled out. */
 293                 quark = ss.getQuarkRelativeAndAdd(formerThreadNode, Attributes.STATUS);
 294                 if (prevState != 0) {
 295                     value = StateValues.PROCESS_STATUS_WAIT_BLOCKED_VALUE;
 296                 } else {
 297                     value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
 298                 }
 299                 ss.modifyAttribute(ts, value, quark);
 300
 301                 /* Set the status of the new scheduled process */
 302                 setProcessToRunning(ss, ts, newCurrentThreadNode);
 303
 304                 /* Set the exec name of the new process */
 305                 quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.EXEC_NAME);
 306                 value = TmfStateValue.newValueString(nextProcessName);
 307                 ss.modifyAttribute(ts, value, quark);
 308
 309                 /* Set the current prio for the new process */
 310                 quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.PRIO);
 311                 value = TmfStateValue.newValueInt(nextPrio);
 312                 ss.modifyAttribute(ts, value, quark);
 313
 314                 /* Make sure the PPID and system_call sub-attributes exist */
 315                 ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.SYSTEM_CALL);
 316                 ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.PPID);
 317
 318                 /* Set the current scheduled process on the relevant CPU */
 319                 quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.CURRENT_THREAD);
 320                 value = TmfStateValue.newValueInt(nextTid);
 321                 ss.modifyAttribute(ts, value, quark);
 322
 323                 /* Set the status of the CPU itself */
 324                 if (nextTid > 0) {
 325                     /* Check if the entering process is in kernel or user mode */
 326                     quark = ss.getQuarkRelativeAndAdd(newCurrentThreadNode, Attributes.SYSTEM_CALL);
 327                     if (ss.queryOngoingState(quark).isNull()) {
 328                         value = StateValues.CPU_STATUS_RUN_USERMODE_VALUE;
 329                     } else {
 330                         value = StateValues.CPU_STATUS_RUN_SYSCALL_VALUE;
 331                     }
 332                 } else {
 333                     value = StateValues.CPU_STATUS_IDLE_VALUE;
 334                 }
 335                 quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS);
 336                 ss.modifyAttribute(ts, value, quark);
 337             }
 338                 break;
 339
 340             case SCHED_PI_SETPRIO_INDEX:
 341             {
 342                 ITmfEventField content = event.getContent();
 343                 Integer tid = ((Long) content.getField(fLayout.fieldTid()).getValue()).intValue();
 344                 Integer prio = ((Long) content.getField(fLayout.fieldNewPrio()).getValue()).intValue();
 345
 346                 Integer updateThreadNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), tid.toString());
 347
 348                 /* Set the current prio for the new process */
 349                 quark = ss.getQuarkRelativeAndAdd(updateThreadNode, Attributes.PRIO);
 350                 value = TmfStateValue.newValueInt(prio);
 351                 ss.modifyAttribute(ts, value, quark);
 352             }
 353                 break;
 354
 355             case SCHED_PROCESS_FORK_INDEX:
 356             {
 357                 ITmfEventField content = event.getContent();
 358                 // String parentProcessName = (String) event.getFieldValue("parent_comm");
 359                 String childProcessName = (String) content.getField(fLayout.fieldChildComm()).getValue();
 360                 // assert ( parentProcessName.equals(childProcessName) );
 361
 362                 Integer parentTid = ((Long) content.getField(fLayout.fieldParentTid()).getValue()).intValue();
 363                 Integer childTid = ((Long) content.getField(fLayout.fieldChildTid()).getValue()).intValue();
 364
 365                 Integer parentTidNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), parentTid.toString());
 366                 Integer childTidNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), childTid.toString());
 367
 368                 /* Assign the PPID to the new process */
 369                 quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.PPID);
 370                 value = TmfStateValue.newValueInt(parentTid);
 371                 ss.modifyAttribute(ts, value, quark);
 372
 373                 /* Set the new process' exec_name */
 374                 quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.EXEC_NAME);
 375                 value = TmfStateValue.newValueString(childProcessName);
 376                 ss.modifyAttribute(ts, value, quark);
 377
 378                 /* Set the new process' status */
 379                 quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.STATUS);
 380                 value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
 381                 ss.modifyAttribute(ts, value, quark);
 382
 383                 /* Set the process' syscall name, to be the same as the parent's */
 384                 quark = ss.getQuarkRelativeAndAdd(parentTidNode, Attributes.SYSTEM_CALL);
 385                 value = ss.queryOngoingState(quark);
 386                 if (value.isNull()) {
 387                     /*
 388                      * Maybe we were missing info about the parent? At least we
 389                      * will set the child right. Let's suppose "sys_clone".
 390                      */
 391                     value = TmfStateValue.newValueString(fLayout.eventSyscallEntryPrefix() + IKernelAnalysisEventLayout.INITIAL_SYSCALL_NAME);
 392                 }
 393                 quark = ss.getQuarkRelativeAndAdd(childTidNode, Attributes.SYSTEM_CALL);
 394                 ss.modifyAttribute(ts, value, quark);
 395             }
 396                 break;
 397
 398             case SCHED_PROCESS_EXIT_INDEX:
 399                 break;
 400
 401             case SCHED_PROCESS_FREE_INDEX:
 402             {
 403                 Integer tid = ((Long) event.getContent().getField(fLayout.fieldTid()).getValue()).intValue();
 404                 /*
 405                  * Remove the process and all its sub-attributes from the
 406                  * current state
 407                  */
 408                 quark = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), tid.toString());
 409                 ss.removeAttribute(ts, quark);
 410             }
 411                 break;
 412
 413             case STATEDUMP_PROCESS_STATE_INDEX:
 414                 /* LTTng-specific */
 415             {
 416                 ITmfEventField content = event.getContent();
 417                 int tid = ((Long) content.getField("tid").getValue()).intValue(); //$NON-NLS-1$
 418                 int pid = ((Long) content.getField("pid").getValue()).intValue(); //$NON-NLS-1$
 419                 int ppid = ((Long) content.getField("ppid").getValue()).intValue(); //$NON-NLS-1$
 420                 int status = ((Long) content.getField("status").getValue()).intValue(); //$NON-NLS-1$
 421                 String name = (String) content.getField("name").getValue(); //$NON-NLS-1$
 422                 /*
 423                  * "mode" could be interesting too, but it doesn't seem to be
 424                  * populated with anything relevant for now.
 425                  */
 426
 427                 int curThreadNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), String.valueOf(tid));
 428
 429                 /* Set the process' name */
 430                 quark = ss.getQuarkRelativeAndAdd(curThreadNode, Attributes.EXEC_NAME);
 431                 if (ss.queryOngoingState(quark).isNull()) {
 432                     /* If the value didn't exist previously, set it */
 433                     value = TmfStateValue.newValueString(name);
 434                     ss.modifyAttribute(ts, value, quark);
 435                 }
 436
 437                 /* Set the process' PPID */
 438                 quark = ss.getQuarkRelativeAndAdd(curThreadNode, Attributes.PPID);
 439                 if (ss.queryOngoingState(quark).isNull()) {
 440                     if (pid == tid) {
 441                         /* We have a process. Use the 'PPID' field. */
 442                         value = TmfStateValue.newValueInt(ppid);
 443                     } else {
 444                         /* We have a thread, use the 'PID' field for the parent. */
 445                         value = TmfStateValue.newValueInt(pid);
 446                     }
 447                     ss.modifyAttribute(ts, value, quark);
 448                 }
 449
 450                 /* Set the process' status */
 451                 quark = ss.getQuarkRelativeAndAdd(curThreadNode, Attributes.STATUS);
 452                 if (ss.queryOngoingState(quark).isNull()) {
 453                     switch (status) {
 454                     case LinuxValues.STATEDUMP_PROCESS_STATUS_WAIT_CPU:
 455                         value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
 456                         break;
 457                     case LinuxValues.STATEDUMP_PROCESS_STATUS_WAIT:
 458                         /*
 459                          * We have no information on what the process is waiting
 460                          * on (unlike a sched_switch for example), so we will
 461                          * use the WAIT_UNKNOWN state instead of the "normal"
 462                          * WAIT_BLOCKED state.
 463                          */
 464                         value = StateValues.PROCESS_STATUS_WAIT_UNKNOWN_VALUE;
 465                         break;
 466                     default:
 467                         value = StateValues.PROCESS_STATUS_UNKNOWN_VALUE;
 468                     }
 469                     ss.modifyAttribute(ts, value, quark);
 470                 }
 471             }
 472                 break;
 473
 474             case SCHED_WAKEUP_INDEX:
 475             {
 476                 final int tid = ((Long) event.getContent().getField(fLayout.fieldTid()).getValue()).intValue();
 477                 final int prio = ((Long) event.getContent().getField(fLayout.fieldPrio()).getValue()).intValue();
 478                 final int threadNode = ss.getQuarkRelativeAndAdd(getNodeThreads(ss), String.valueOf(tid));
 479
 480                 /*
 481                  * The process indicated in the event's payload is now ready to
 482                  * run. Assign it to the "wait for cpu" state, but only if it
 483                  * was not already running.
 484                  */
 485                 quark = ss.getQuarkRelativeAndAdd(threadNode, Attributes.STATUS);
 486                 int status = ss.queryOngoingState(quark).unboxInt();
 487
 488                 if (status != StateValues.PROCESS_STATUS_RUN_SYSCALL &&
 489                     status != StateValues.PROCESS_STATUS_RUN_USERMODE) {
 490                     value = StateValues.PROCESS_STATUS_WAIT_FOR_CPU_VALUE;
 491                     ss.modifyAttribute(ts, value, quark);
 492                 }
 493
 494                 /*
 495                  * When a user changes a threads prio (e.g. with pthread_setschedparam),
 496                  * it shows in ftrace with a sched_wakeup.
 497                  */
 498                 quark = ss.getQuarkRelativeAndAdd(threadNode, Attributes.PRIO);
 499                 value = TmfStateValue.newValueInt(prio);
 500                 ss.modifyAttribute(ts, value, quark);
 501             }
 502                 break;
 503
 504             default:
 505             /* Other event types not covered by the main switch */
 506             {
 507                 if (eventName.startsWith(fLayout.eventSyscallEntryPrefix())
 508                         || eventName.startsWith(fLayout.eventCompatSyscallEntryPrefix())) {
 509
 510                     /* Assign the new system call to the process */
 511                     quark = ss.getQuarkRelativeAndAdd(currentThreadNode, Attributes.SYSTEM_CALL);
 512                     value = TmfStateValue.newValueString(eventName);
 513                     ss.modifyAttribute(ts, value, quark);
 514
 515                     /* Put the process in system call mode */
 516                     quark = ss.getQuarkRelativeAndAdd(currentThreadNode, Attributes.STATUS);
 517                     value = StateValues.PROCESS_STATUS_RUN_SYSCALL_VALUE;
 518                     ss.modifyAttribute(ts, value, quark);
 519
 520                     /* Put the CPU in system call (kernel) mode */
 521                     quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS);
 522                     value = StateValues.CPU_STATUS_RUN_SYSCALL_VALUE;
 523                     ss.modifyAttribute(ts, value, quark);
 524
 525                 } else if (eventName.startsWith(fLayout.eventSyscallExitPrefix())) {
 526
 527                     /* Clear the current system call on the process */
 528                     quark = ss.getQuarkRelativeAndAdd(currentThreadNode, Attributes.SYSTEM_CALL);
 529                     value = TmfStateValue.nullValue();
 530                     ss.modifyAttribute(ts, value, quark);
 531
 532                     /* Put the process' status back to user mode */
 533                     quark = ss.getQuarkRelativeAndAdd(currentThreadNode, Attributes.STATUS);
 534                     value = StateValues.PROCESS_STATUS_RUN_USERMODE_VALUE;
 535                     ss.modifyAttribute(ts, value, quark);
 536
 537                     /* Put the CPU's status back to user mode */
 538                     quark = ss.getQuarkRelativeAndAdd(currentCPUNode, Attributes.STATUS);
 539                     value = StateValues.CPU_STATUS_RUN_USERMODE_VALUE;
 540                     ss.modifyAttribute(ts, value, quark);
 541                 }
 542
 543             }
 544                 break;
 545             } // End of big switch
 546
 547         } catch (AttributeNotFoundException ae) {
 548             /*
 549              * This would indicate a problem with the logic of the manager here,
 550              * so it shouldn't happen.
 551              */
 552             ae.printStackTrace();
 553
 554         } catch (TimeRangeException tre) {
 555             /*
 556              * This would happen if the events in the trace aren't ordered
 557              * chronologically, which should never be the case ...
 558              */
 559             System.err.println("TimeRangeExcpetion caught in the state system's event manager."); //$NON-NLS-1$
 560             System.err.println("Are the events in the trace correctly ordered?"); //$NON-NLS-1$
 561             tre.printStackTrace();
 562
 563         } catch (StateValueTypeException sve) {
 564             /*
 565              * This would happen if we were trying to push/pop attributes not of
 566              * type integer. Which, once again, should never happen.
 567              */
 568             sve.printStackTrace();
 569         }
 570     }
 571
 572     // ------------------------------------------------------------------------
 573     // Convenience methods for commonly-used attribute tree locations
 574     // ------------------------------------------------------------------------
 575
 576     private static int getNodeCPUs(ITmfStateSystemBuilder ssb) {
 577         return ssb.getQuarkAbsoluteAndAdd(Attributes.CPUS);
 578     }
 579
 580     private static int getNodeThreads(ITmfStateSystemBuilder ssb) {
 581         return ssb.getQuarkAbsoluteAndAdd(Attributes.THREADS);
 582     }
 583
 584     private static int getNodeIRQs(ITmfStateSystemBuilder ssb) {
 585         return ssb.getQuarkAbsoluteAndAdd(Attributes.RESOURCES, Attributes.IRQS);
 586     }
 587
 588     private static int getNodeSoftIRQs(ITmfStateSystemBuilder ssb) {
 589         return ssb.getQuarkAbsoluteAndAdd(Attributes.RESOURCES, Attributes.SOFT_IRQS);
 590     }
 591
 592     // ------------------------------------------------------------------------
 593     // Advanced state-setting methods
 594     // ------------------------------------------------------------------------
 595
 596     /**
 597      * When we want to set a process back to a "running" state, first check
 598      * its current System_call attribute. If there is a system call active, we
 599      * put the process back in the syscall state. If not, we put it back in
 600      * user mode state.
 601      */
 602     private static void setProcessToRunning(ITmfStateSystemBuilder ssb, long ts, int currentThreadNode)
 603             throws AttributeNotFoundException, TimeRangeException,
 604             StateValueTypeException {
 605         int quark;
 606         ITmfStateValue value;
 607
 608         quark = ssb.getQuarkRelativeAndAdd(currentThreadNode, Attributes.SYSTEM_CALL);
 609         if (ssb.queryOngoingState(quark).isNull()) {
 610             /* We were in user mode before the interruption */
 611             value = StateValues.PROCESS_STATUS_RUN_USERMODE_VALUE;
 612         } else {
 613             /* We were previously in kernel mode */
 614             value = StateValues.PROCESS_STATUS_RUN_SYSCALL_VALUE;
 615         }
 616         quark = ssb.getQuarkRelativeAndAdd(currentThreadNode, Attributes.STATUS);
 617         ssb.modifyAttribute(ts, value, quark);
 618     }
 619
 620     /**
 621      * Similar logic as above, but to set the CPU's status when it's coming out
 622      * of an interruption.
 623      */
 624     private static void cpuExitInterrupt(ITmfStateSystemBuilder ssb, long ts,
 625             int currentCpuNode, int currentThreadNode)
 626             throws StateValueTypeException, AttributeNotFoundException,
 627             TimeRangeException {
 628         int quark;
 629         ITmfStateValue value;
 630
 631         quark = ssb.getQuarkRelativeAndAdd(currentCpuNode, Attributes.CURRENT_THREAD);
 632         if (ssb.queryOngoingState(quark).unboxInt() > 0) {
 633             /* There was a process on the CPU */
 634             quark = ssb.getQuarkRelative(currentThreadNode, Attributes.SYSTEM_CALL);
 635             if (ssb.queryOngoingState(quark).isNull()) {
 636                 /* That process was in user mode */
 637                 value = StateValues.CPU_STATUS_RUN_USERMODE_VALUE;
 638             } else {
 639                 /* That process was in a system call */
 640                 value = StateValues.CPU_STATUS_RUN_SYSCALL_VALUE;
 641             }
 642         } else {
 643             /* There was no real process scheduled, CPU was idle */
 644             value = StateValues.CPU_STATUS_IDLE_VALUE;
 645         }
 646         quark = ssb.getQuarkRelativeAndAdd(currentCpuNode, Attributes.STATUS);
 647         ssb.modifyAttribute(ts, value, quark);
 648     }
 649 }