Re: [RFC][PATCH] new timeofday core subsystem (v. A3)

From: Christoph Lameter
Date: Mon Mar 14 2005 - 19:53:52 EST

On Mon, 14 Mar 2005, Matt Mackall wrote:
> We can either stick all the generic mmio timer functions in the
> vsyscall page (they're tiny) or leave the vsyscall using type/ptr but
> have the kernel internally use only the function pointer. Someone
> who's more familiar with the vsyscall timer code should chime in here.

No we cannot do any function calls in a fastcall path on ia64. The current
design is ok. Why duplicate the functionality with additional indirect
function calls? Plus an indirect function calls stalls pipelines on some
processors and will limit the performance of gettimeofday.

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