Subject: Re: Lazy FP in SMP
To: Matt Thomas <>
From: Allen Briggs <>
List: tech-smp
Date: 11/21/2000 10:51:50
On Mon, Nov 20, 2000 at 11:19:36PM -0800, Matt Thomas wrote:
> Either way, a process get screwed.  This also mean that more bookkeeping
> needs to added such that you know what CPU has this processors FP state.

The only other clean-ish solution that I can think of is to have
semi-lazy FP and only do lazy FP state restores.  If FP is used,
always save it on the context switch.  Of course, this is probably
a net loss since you pay part of the penalty every time you context
switch an FP-using process.