/**
* This method controls the triggering of a GC. It is called periodically during allocation.
* Returns true to trigger a collection.
*
* @param spaceFull Space request failed, must recover pages within 'space'.
* @return True if a collection is requested by the plan.
*/
public final boolean collectionRequired(boolean spaceFull) {
int nurseryPages = nurserySpace.reservedPages();
if (nurseryPages > Options.nurserySize.getMaxNursery()) {
return true;
}
if (virtualMemoryExhausted()) return true;
return super.collectionRequired(spaceFull);
}
/**
* This method controls the triggering of a GC. It is called periodically during allocation.
* Returns true to trigger a collection.
*
* @param spaceFull Space request failed, must recover pages within 'space'.
* @return True if a collection is requested by the plan.
*/
public final boolean collectionRequired(boolean spaceFull, Space space) {
int nurseryPages = nurserySpace.reservedPages();
if (nurseryPages > Options.nurserySize.getMaxNursery()) {
return true;
}
if (virtualMemoryExhausted()) {
return true;
}
if (spaceFull && space != nurserySpace) {
nextGCFullHeap = true;
}
return super.collectionRequired(spaceFull, space);
}
/**
* Return the number of pages reserved for copying.
*
* @return The number of pages reserved given the pending allocation, including space reserved for
* copying.
*/
@Override
public int getCollectionReserve() {
return nurserySpace.reservedPages() + super.getCollectionReserve();
}
/**
* Return the number of pages in use given the pending allocation. Simply add the nursery's
* contribution to that of the superclass.
*
* @return The number of pages reserved given the pending allocation, excluding space reserved for
* copying.
*/
@Override
public int getPagesUsed() {
return (nurserySpace.reservedPages() + super.getPagesUsed());
}
/**
* Independent of how many pages remain in the page budget (a function of heap size), we must
* ensure we never exhaust virtual memory. Therefore we must never let the nursery grow to the
* extent that it can't be copied into the mature space.
*
* @return True if the nursery has grown to the extent that it may not be able to be copied into
* the mature space.
*/
private boolean virtualMemoryExhausted() {
return ((int) (nurserySpace.reservedPages() * WORST_CASE_COPY_EXPANSION)
>= getMaturePhysicalPagesAvail());
}
/**
* This method controls the triggering of a GC. It is called periodically during allocation.
* Returns true to trigger a collection.
*
* @param spaceFull Space request failed, must recover pages within 'space'.
* @return True if a collection is requested by the plan.
*/
public final boolean collectionRequired(boolean spaceFull) {
boolean nurseryFull = nurserySpace.reservedPages() > Options.nurserySize.getMaxNursery();
return super.collectionRequired(spaceFull) || nurseryFull;
}
/**
* Return the number of pages in use given the pending allocation. Simply add the nursery's
* contribution to that of the superclass.
*
* @return The number of pages reserved given the pending allocation, excluding space reserved for
* copying.
*/
public final int getPagesUsed() {
return super.getPagesUsed() + nurserySpace.reservedPages();
}
/**
* Return the number of pages reserved for copying.
*
* @return The number of pages reserved given the pending allocation, including space reserved for
* copying.
*/
public final int getCollectionReserve() {
return nurserySpace.reservedPages() + super.getCollectionReserve();
}
