Subj : Re: virtual addresses
To   : comp.programming
From : Randy Howard
Date : Sat Sep 24 2005 07:50 am

Bill Cunningham wrote
(in article <hs0Ze.922$qC4.180@trnddc02>):

>     So the applications and the kernel space do not know what the real
> physical addresses are then. At least kernel space other than the memory
> manager?

That is typically true for applications (with rare exceptions), 
but drivers and kernel code often know the physical address or 
both, depending on what is being done down low.

If you think about it, there really isn't a reason why an 
application needs to know the physical address.  

In really high-end systems that support failover and RAID memory 
systems, and even 'hot add' of memory to a running system, it is 
extremely advantageous to not have apps tied to physical 
addresses.


-- 
Randy Howard (2reply remove FOOBAR)

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