Re: Error in x86 CPU capabilities starting with test5/6

[Andi Kleen]

On Fri, Nov 17, 2000 at 02:21:03PM +0100, Christoph Rohland wrote:
> Hi Jeff,
> 
> On Fri, 17 Nov 2000, Jeff Garzik wrote:
> > IIRC, this came up a long time ago WRT Apache, which made a lot of
> > gettimeofday() calls.  Someone (Linus?) proposed the solution of a
> > 'magic page' which holds information like gettimeofday() stuff, but
> > could be handled much more rapidly than a standard syscall.
> 
> Yes, I followed that thread closely and would love to see this as the
> implementation for gettimeofday. This would make rdtsc for
> applications superfluous.

No it would not. Often you want cycle accurate couting for profiling
purposes.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
Please read the FAQ at http://www.tux.org/lkml/