Re: Simple question about pingpong roottask

On Wed, 2006-06-28 at 18:57 +0200, Espen Skoglund wrote:

> [Disclaimer: Your example doesn't seem to be a complete pingpong, so
> what I say here depends on the rest of the stuff you do.]
> 
> The pager of the initial root task thread is sigma0.  When sigma0
> receives a pagefault it "translates" this into a regular sigma0 memory
> request.  Sigma0 will only hand out the same memory twice if it is the
> exact same thread that requested it the first time.  Touching all the
> memory in the root task as such ensures that all the memory in the
> root task is requested by the initial thread.  This ensures that you
> don't get conflicts in sigma0 about who owns which memory.

But as far as I could see in the source to sigma0, it flags any memory
occupied by any boot module (s0, s1, kernel, root task) as being of
L4_BootLoaderSpecificMemoryType so that s0 doesn't allocate the memory
to anyone else. Hence the question on my site "Does the root task need
to cause page faults on it's image in memory?"

Thanks,
Luke.