Messages in this thread | ![/](/images/icornerl.gif) | | From | (Linus Torvalds) | Subject | Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance) | Date | Wed, 12 Feb 2003 17:24:08 +0000 (UTC) |
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In article <20030212101831.GB10422@bjl1.jlokier.co.uk>, Jamie Lokier <jamie@shareable.org> wrote: > >I meant: the trampoline _stack_ lives in the TSS. > >There is no trampoline _code_.
Ahh, ok. That sounds quite doable, and all my complaints go away.
It still leaves the debug exception and NMI issue.
The debug exception case is easy to trigger: use gdb to single-step through the user-lebel fast system call code, and you _will_ get a debug exception on the very first kernel instruction (which is also the one that doesn't have a valid stack).
So anybody want to actually try to implement this?
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