Preallocation of objects by rotor

Hi,
 The log_alloc trace output indicates that before the user program
allocates any objects in the heap, rotor itself does a lot of
preallocations both in the small & the large objects heap.
what is the liveness of these pre-created objects, does it stay all along
till the end of the application?.
Will these objects create pressure on the young generation of the heap
[ie. can these objects cause an early young generation collection?
because they are so many in number]
How does rotor handle this?

regards
archana