/**
* Determine if this GC should be a full heap collection.
*
* @return True is this GC should be a full heap collection.
*/
protected boolean requiresFullHeapCollection() {
if (collectionTrigger == Collection.EXTERNAL_GC_TRIGGER
&& Options.fullHeapSystemGC.getValue()) {
return true;
}
if (nextGCFullHeap || collectionAttempt > 1) {
// Forces full heap collection
return true;
}
if (loSpace.allocationFailed()
|| nonMovingSpace.allocationFailed()
|| (USE_CODE_SPACE
&& (largeCodeSpace.allocationFailed() || smallCodeSpace.allocationFailed()))) {
// We need space from the nursery
return true;
}
if (virtualMemoryExhausted()) return true;
int smallNurseryPages = nurserySpace.committedPages();
int smallNurseryYield = (int) ((smallNurseryPages << 1) * SURVIVAL_ESTIMATE);
if (smallNurseryYield < getPagesRequired()) {
// Our total yield is insufficent.
return true;
}
if (nurserySpace.allocationFailed()) {
if (smallNurseryYield < (nurserySpace.requiredPages() << 1)) {
// We have run out of VM pages in the nursery
return true;
}
}
return false;
}
/**
* Calculate the number of pages a collection is required to free to satisfy outstanding
* allocation requests.
*
* @return the number of pages a collection is required to free to satisfy outstanding allocation
* requests.
*/
@Override
public int getPagesRequired() {
/* We don't currently pretenure, so mature space must be zero */
return super.getPagesRequired() + (nurserySpace.requiredPages() << 1);
}
/**
* Calculate the number of pages a collection is required to free to satisfy outstanding
* allocation requests.
*
* @return the number of pages a collection is required to free to satisfy outstanding allocation
* requests.
*/
public int getPagesRequired() {
return super.getPagesRequired() + (nurserySpace.requiredPages() << 1);
}