[LMH] Oldspace?

[nyef@sc.am]

On Tue, May 25, 2004 at 11:51:41PM -0500, Steve Krueger wrote:
> Alastair,
> 
> Here is how it works on Explorer I:
> 
> After a memory read, the level 1 memory map is run again on the data 
> returned in order to get the oldspace bit.  This bit is bit 10 (decimal) 
> of the Level 1 map.

Okay, that's about what I was hoping for.

Now, for the GCVF stuff, the EXPT tests set up the level-2 map values, 
do a memory read (?), do the ((MD) SETM MD) thing just as for a write, 
set up the level-1 map values, and then dispatch. I'm assuming then that 
any read or write activity caches the level-2 map value from VMA and 
then the dispatch compares the GCV fields from the cached level-2 map 
and the level-1 map for the contents of MD at dispatch time to find the 
GCVF value. Does this model bear more than a passing resemblance to 
reality?

> I just dashed this off.  I hope it isn't too cryptic.

Not at all. Exactly what I wanted to know, and some extra background 
information. Thank you.

>    -Steve

--Alastair