[iyonix-support] Re: Lazy Task Swapping on Iyonix/RISC OS 5.11

On 26 Jun, Chris Evans <chris@xxxxxxxxxxxxxxx> wrote:
> On Mon 26 Jun, David Thomas wrote:
> > 
> > Chris Evans wrote:
> > 
> > > I believe it is only used in RISC OS 4.02 and later and then only when
> > > Rev T StrongARM is detected! Given the forking of the OS before then
> > > many other things are different I believe.
> > 
> > Lazy Task Swapping was introduced with RISC OS 3.7.
>
> Er.. are you sure?
> I can recall discussing it with Justin at ROL in Stratford.
>
> Google groups has the first mention of "Lazy Task Swapping" is Sept 98
> which is talking about Phoebe and an internal RO4 version at Acorn!
>
> The June 2000 monthly FAQ refers to some changes in 3.70 to improve the
> paging in of applications but goes onto explain RO 4 introduced a new
> better method called 'Lazy Task Swapping'

When I was at Acorn, I think it was Mike Stephens who was implementing
various Kernel performance improvements for Ursula (RISC OS 4)/Phoebe and
lazy task swapping was one of those improvements. It wasn't part of RISC OS
3.7.

Steve

-- 
Steve @ PlusNet
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