From: "H. Peter Anvin" <[email protected]>
Date: Mon, 19 Nov 2007 18:00:23 -0800
> Christoph Lameter wrote:
> > Support fast cpu ops in x86_64 by providing a series of functions that
> > generate the proper instructions. Define CONFIG_FAST_CPU_OPS so that core code
> > can exploit the availability of fast per cpu operations.
> >
> > Signed-off-by: Christoph Lameter <[email protected]>
>
> There was, at some point, discussion about using the gcc TLS mechanism,
> which should permit even better code to be generated. Unfortunately, it
> would require gcc to be able to reference %gs instead of %fs (and vice
> versa for i386), which I don't think is available in anything except
> maybe the most cutting-edge version of gcc.
You can't use __thread because GCC will cache __thread computed
addresses across context switches and cpu changes.
It's been tried before on powerpc, it doesn't work.
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