When doing kstack swapin, read as much pages in one run as possible.
When doing kstack swapin, read as much pages in one run as possible.

Suggested and reviewed by:	alc (previous version)
Tested by:	pho
MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase