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

Hi

In message <bb44b83a4e.druck@xxxxxxxxxxxxxxxx>
          "David J. Ruck" <druck@xxxxxxxxxxxx> wrote:

> On 21 Jun 2006 Paul Vigay <lists-nospam@xxxxxxxxx> wrote:
> > I know what /does/ solve it. When the pinboard image is corrupted with the
> > line of pixels, if you open a task window and manually turn off LTS via the
> > SWI call, then hit f12 return to redraw the desktop, it does indeed restore
> > the corrupted pinboard back to it's correct image.
> 
> That is interesting. The incorrect page mapping is not in the screen memory,
> but the source data that the application uses to generate the pinboard
> image. When lazy task swapping enabled, either an incorrect page is being
> mapped in, or a page from another task isn't being mapped out. When LTS is
> disabled it immediately restores the correct pages, indicating that the
> kernel memory containing the page information isn't corrupted.

One thing .. pages are 4k in size .. what size (Paul.. with sprites in
particular) is the chunk of 'misplaced' data?  Perhaps the size of this
might give a clue to which app or process is misbehaving. If the chunk
of such data is 4k based (or 4k boundary based perhaps), then LTS will
be my first choice. If different, then we'll need to look elsewhere.

n.b. LTS will almost inevitably will expose any misbehaviour in other
areas.

John

[snip]



-- 
John Ballance
jwb@xxxxxxxxxx
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