Messages in this thread | | | Date | Mon, 19 Nov 2007 18:19:33 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [rfc 37/45] x86_64: Support for fast per cpu operations |
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David Miller wrote: >> 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.
OK, that pretty much answers that question.
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