When can I call SetPageReserved()?

[Timur Tabi <timur.tabi@ammasso.com>]

I'm trying to figure out what kind of memory I can call 
SetPageReserved() on.  Is it okay to use it on memory obtained via a 
kiobuf?  I get the feeling that SetPageReserved() should only be used on 
memory that is allocated in the kernel itself, such as a DMA buffer 
allocated via kmalloc(), and never on memory that is allocated by a user 
process (which is what kiobuf gives me).  Is that correct?

The problem we're seeing is that the VM is swapping out pages obtained 
via a kiobuf.  We can't use lock_kiobuf() because sometimes the memory 
regions overlap, and lock_kiobuf() rejects attempts to lock memory that 
already has at least one locked page.

--
Timur Tabi
Staff Software Engineer
timur.tabi@ammasso.com

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