private void CompactPhaseCleanup(Thread currentThread, PageType generation, UIntPtr newLimitPtr) { VTable.Assert(IsValidGeneration((int)generation)); registerThreadReferenceVisitor.Cleanup(); // Free up skipped pages while (!this.skippedPageQueue.IsEmpty) { UIntPtr start = this.skippedPageQueue.Read(); UIntPtr finish = this.skippedPageQueue.Read(); InteriorPtrTable.ClearFirst(start, finish); PageManager.FreePageRange(start, finish); if (GC.remsetType == RemSetType.Cards) { OffsetTable.ClearLast(PageTable.PageAddr(start), PageTable.PageAddr(finish) - 1); } } this.skippedPageQueue.Cleanup(true); // Release the queue standby pages UnmanagedPageList.ReleaseStandbyPages(); // Update the ownership information for the copied data PageType destGeneration = (generation == MAX_GENERATION) ? MAX_GENERATION : (PageType)(generation + 1); UIntPtr limitPage = PageTable.Page(PageTable.PagePad(newLimitPtr)); for (UIntPtr i = UIntPtr.Zero; i < limitPage; i++) { if (IsMyZombiePage(i)) { PageTable.SetType(i, (PageType)destGeneration); } } }
internal static void ReclaimZombiePages(UIntPtr heapPageCount, int generation) { // to indicate if we want to release pages back to the OS bool releasePages = true; UIntPtr reservePages = UIntPtr.Zero; if (generation == (int)nurseryGeneration) { // don't bother when we do nursery collection since // nursery size is small. releasePages = false; } else { reservePages = heapPageCount; UIntPtr alreadyReservedPages = PageManager.TotalUnusedPages(); if (reservePages > alreadyReservedPages) { reservePages = reservePages - alreadyReservedPages; } else { reservePages = UIntPtr.Zero; } } // MarkZombiePages updates the range for this generation, so we do // not need to take the union ranges of all target generations UIntPtr minZombiePage = MinGenPage[generation]; UIntPtr maxZombiePage = MaxGenPage[generation]; for (UIntPtr i = minZombiePage; i <= maxZombiePage; i++) { if (IsMyZombiePage(i)) { UIntPtr startPage = i; UIntPtr endPage = startPage; do { endPage++; } while (IsMyZombiePage(endPage)); InteriorPtrTable.ClearFirst(startPage, endPage); if (GC.remsetType == RemSetType.Cards) { OffsetTable.ClearLast(PageTable.PageAddr(startPage), PageTable.PageAddr(endPage) - 1); } if (!releasePages) { // Don't need to worry about giving the pages back // Zero out the memory for reuse UIntPtr pageCount = endPage - startPage; PageManager.ReleaseUnusedPages(startPage, pageCount, false); } else if (reservePages > UIntPtr.Zero) { // Keep sufficient pages for the new nursery UIntPtr pageCount = endPage - startPage; if (pageCount > reservePages) { // Zero out the memory for reuse PageManager.ReleaseUnusedPages(startPage, reservePages, false); startPage += reservePages; PageManager.FreePageRange(startPage, endPage); reservePages = UIntPtr.Zero; } else { // Zero out the memory for reuse PageManager.ReleaseUnusedPages(startPage, pageCount, false); reservePages = reservePages - pageCount; } } else { PageManager.FreePageRange(startPage, endPage); } i = endPage - 1; } } }