Messages in this thread | | | Date | Wed, 13 Sep 2006 11:59:42 +0200 | From | Ingo Molnar <> | Subject | Re: i386 PDA patches use of %gs |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> [...] The basic inner loop is: > > push %segreg > mov %selectorreg, %segreg > add $1,%segreg:offset # use the segment register > pop %segreg
well, the most important thing i believe you didnt test: the effect of mixing two descriptors on the _same_ selector: one %gs selector value loaded and used by glibc, and another %gs selector value loaded and used by the kernel, intermixed. It's the mixing that causes the descriptor cache reload. (unless i missed some detail about your testcase)
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