Exemplo n.º 1
0
/* enter and leave should be called at the start and end of every GC
 * function that is exported to the outside world.  They make sure
 * that the function is run in a critical section and check the GC
 * invariant.
 */
void enter (GC_state s) {
  if (DEBUG)
    fprintf (stderr, "enter\n");
  /* used needs to be set because the mutator has changed s->stackTop. */
  getStackCurrent(s)->used = sizeofGCStateCurrentStackUsed (s);
  getThreadCurrent(s)->exnStack = s->exnStack;
  if (DEBUG) 
    displayGCState (s, stderr);
  beginAtomic (s);
  assert (invariantForGC (s));
  if (DEBUG)
    fprintf (stderr, "enter ok\n");
}
Exemplo n.º 2
0
void performGC (GC_state s, 
                size_t oldGenBytesRequested,
                size_t nurseryBytesRequested, 
                bool forceMajor,
                bool mayResize) {
  uintmax_t gcTime;
  bool stackTopOk;
  size_t stackBytesRequested;
  struct rusage ru_start;
  size_t totalBytesRequested;

  enterGC (s);
  s->cumulativeStatistics.numGCs++;
  if (DEBUG or s->controls.messages) {
    size_t nurserySize = s->heap.size - ((size_t)(s->heap.nursery - s->heap.start));
    size_t nurseryUsed = (size_t)(s->frontier - s->heap.nursery);
    fprintf (stderr, 
             "[GC: Starting gc #%s; requesting %s nursery bytes and %s old-gen bytes,]\n",
             uintmaxToCommaString(s->cumulativeStatistics.numGCs),
             uintmaxToCommaString(nurseryBytesRequested),
             uintmaxToCommaString(oldGenBytesRequested));
    fprintf (stderr, 
             "[GC:\theap at "FMTPTR" of size %s bytes (+ %s bytes card/cross map),]\n",
             (uintptr_t)(s->heap.start),
             uintmaxToCommaString(s->heap.size),
             uintmaxToCommaString(s->heap.withMapsSize - s->heap.size));
    fprintf (stderr, 
             "[GC:\twith old-gen of size %s bytes (%.1f%% of heap),]\n",
             uintmaxToCommaString(s->heap.oldGenSize),
             100.0 * ((double)(s->heap.oldGenSize) / (double)(s->heap.size)));
    fprintf (stderr,
             "[GC:\tand nursery of size %s bytes (%.1f%% of heap),]\n",
             uintmaxToCommaString(nurserySize),
             100.0 * ((double)(nurserySize) / (double)(s->heap.size)));
    fprintf (stderr,
             "[GC:\tand nursery using %s bytes (%.1f%% of heap, %.1f%% of nursery).]\n",
             uintmaxToCommaString(nurseryUsed),
             100.0 * ((double)(nurseryUsed) / (double)(s->heap.size)),
             100.0 * ((double)(nurseryUsed) / (double)(nurserySize)));
  }
  assert (invariantForGC (s));
  if (needGCTime (s))
    startTiming (&ru_start);
  minorGC (s);
  stackTopOk = invariantForMutatorStack (s);
  stackBytesRequested = 
    stackTopOk 
    ? 0 
    : sizeofStackWithHeader (s, sizeofStackGrowReserved (s, getStackCurrent (s)));
  totalBytesRequested = 
    oldGenBytesRequested 
    + nurseryBytesRequested
    + stackBytesRequested;
  if (forceMajor 
      or totalBytesRequested > s->heap.size - s->heap.oldGenSize)
    majorGC (s, totalBytesRequested, mayResize);
  setGCStateCurrentHeap (s, oldGenBytesRequested + stackBytesRequested, 
                         nurseryBytesRequested);
  assert (hasHeapBytesFree (s, oldGenBytesRequested + stackBytesRequested,
                            nurseryBytesRequested));
  unless (stackTopOk)
    growStackCurrent (s);
  setGCStateCurrentThreadAndStack (s);
  if (needGCTime (s)) {
    gcTime = stopTiming (&ru_start, &s->cumulativeStatistics.ru_gc);
    s->cumulativeStatistics.maxPauseTime = 
      max (s->cumulativeStatistics.maxPauseTime, gcTime);
  } else
    gcTime = 0;  /* Assign gcTime to quell gcc warning. */
  if (DEBUG or s->controls.messages) {
    size_t nurserySize = s->heap.size - (size_t)(s->heap.nursery - s->heap.start);
    fprintf (stderr, 
             "[GC: Finished gc #%s; time %s ms,]\n",
             uintmaxToCommaString(s->cumulativeStatistics.numGCs),
             uintmaxToCommaString(gcTime));
    fprintf (stderr, 
             "[GC:\theap at "FMTPTR" of size %s bytes (+ %s bytes card/cross map),]\n",
             (uintptr_t)(s->heap.start),
             uintmaxToCommaString(s->heap.size),
             uintmaxToCommaString(s->heap.withMapsSize - s->heap.size));
    fprintf (stderr, 
             "[GC:\twith old-gen of size %s bytes (%.1f%% of heap),]\n",
             uintmaxToCommaString(s->heap.oldGenSize),
             100.0 * ((double)(s->heap.oldGenSize) / (double)(s->heap.size)));
    fprintf (stderr,
             "[GC:\tand nursery of size %s bytes (%.1f%% of heap).]\n",
             uintmaxToCommaString(nurserySize),
             100.0 * ((double)(nurserySize) / (double)(s->heap.size)));
  }
  /* Send a GC signal. */
  if (s->signalsInfo.gcSignalHandled
      and s->signalHandlerThread != BOGUS_OBJPTR) {
    if (DEBUG_SIGNALS)
      fprintf (stderr, "GC Signal pending.\n");
    s->signalsInfo.gcSignalPending = TRUE;
    unless (s->signalsInfo.amInSignalHandler) 
      s->signalsInfo.signalIsPending = TRUE;
  }
  if (DEBUG) 
    displayGCState (s, stderr);
  assert (hasHeapBytesFree (s, oldGenBytesRequested, nurseryBytesRequested));
  assert (invariantForGC (s));
  leaveGC (s);
}