Re: [RFD] Separating struct task and the kernel stacks

David Mosberger
2005-06-10T16:54:27Z

>>>>> On Fri, 10 Jun 2005 16:15:11 +1000, Keith Owens <kaos@sgi.com> said:

Keith> Since the slab allocator uses addresses in region 7, we do
Keith> not need any extra hard wired TLBs for the separate struct
Keith> task. The alt-DTLB handler will load the TLB on the fly, it
Keith> does not need any stack data to do that.

Interruption handlers access the task structure, register-backing
store, and memory stack via the virtual address-space. Since
interruption-collection is turned off in those handlers, the alt-DTLB
handler doesn't do you any good.

Being able to map these structures with a single translation-register
is the primary reason for keeping the task structure and the stacks
together on ia64.

--david