Re: [PATCH 0/3] Remove interrupt stack table usage from x86_64 kernel

From: Avi Kivity
Date: Sun Dec 28 2008 - 15:08:46 EST


Avi Kivity wrote:
Avi Kivity wrote:
1. Add per-cpu IDT

Or we could have just two IDTs - one with IST and one without. I clocked LIDT at 58 cycles (and we need two per heavyweight switch), so it's not that wonderful.

This makes the whole thing unworthwhile. The vmload/vmsave pair costs only 200 cycles (I should have started with this), and 120 cycles on the heavyweight path plus complexity are not worth 200 cycles on the lightweight path.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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