Controls the size of a chunk of memory that is dedicated for use
by the kernel memory allocator while executing in the pageout
It is the number of bytes reserved for the pageout
daemon (including overhead).
The purpose is to allow pageout operations that might otherwise
be blocked waiting for memory to proceed, thereby avoiding deadlock.
This value should only be increased if a system hang is observed,
and analysis of the kernel's behavior
(for example using kdb or crash) shows that a
pageout deadlock was responsible.
Specifies how much time, in seconds, there is between successive attempts
by the kernel memory allocator to give back unused memory (for possible use by
processes or filesystems).
Increasing this value increases the kernel allocator's requirement for memory.
Decreasing it increases the CPU usage of the giveback attempts.