topic Re: Mapping in Operating System - HP-UX

Mapping

Ismail Azad — Tue, 09 Nov 2010 17:45:51 GMT

How is the mapping between physical to virtual address space done in hpux?

Re: Mapping

Ismail Azad — Tue, 09 Nov 2010 19:09:08 GMT

Let me make my question clear. HPUX operating systems have a kernel which has it's own view of the operating system which in turn is related to the virtual address space. The virtual address space has to be mapped to the physical address space. Right?. Probably a buffer.

Re: Mapping

Bill Hassell — Tue, 09 Nov 2010 19:12:19 GMT

The attached document has a good overview of memory management in HP-UX. It is not simple...

Re: Mapping

Ismail Azad — Tue, 09 Nov 2010 19:20:32 GMT

Thanks Mr. Hassell,

Just wanted to know what is the concept of TLB in HPUX and what a TLB cache miss/hit was. Is the TLB a finite registry? Can someone briefly throw some light on to this!

Re: Mapping

Dennis Handly — Tue, 09 Nov 2010 20:39:18 GMT

>Just wanted to know what is the concept of TLB in HP-UX and what a TLB cache miss/hit was. Is the TLB a finite registry?

The TLB is a hardware thingy. A web search should tell you about those. Yes, the TLB is very limited and the OS has to constantly refill it. Large pages help here.
There are both a hardware and software walkers to handle misses.

>TLB cache miss/hit

As in any cache, if you get a hit, it's fast, if you get a miss, something has to flush a cache entry and refill it with the new info.