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;
}
}
}
