Messages in this thread | | | Date | Wed, 15 Nov 2006 19:49:36 +0100 | From | Ingo Molnar <> | Subject | Re: i386 PDA patches use of %gs |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> Ingo Molnar wrote: > > but it does not actually use the 'normal usermode TLS selector' - it > > only loads it. > > > > a meaningful test would be to allocate two selector values and load and > > read+write memory through both of them. > > > > Well, obviously in one case it would need to switch between > null/non-null/null. But yes, good point about using the "usermode" > %gs each iteration. I'll do some more tests.
i'd not even use glibc's %gs but set up two separate selectors. (that's a more controlled experiment - someone might run a non-TLS glibc, etc.)
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