Re: [RFC PATCH 13/22 -v2] handle accurate time keeping over long delays

Tony Luck
2008-01-10T19:54:36Z

> Tony: ia64 also needs something like this, but I found the fsyscall asm
> bits a little difficult to grasp. So I'll need some assistance on how to
> include the accumulated cycles into the final calculation.

I'm trying to figure out all the ramifications of the new
"cycle_accumulated" field. Does it really need to be
propagated all the way to the low level assembler (which
I don't want to mess with unless I really, really have to).
Can't I do the necessary calculations in update_vsyscall()
[Where I can do them in C :-)] and keep the same low
level assembly code. I think I must be missing some
important bit of what is going on here.

-Tony