Re: "Hijacking" a PCU.

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Sat, 15 Dec 2012, Martin Husemann wrote:

> I did some statistics and did not find a single lwp exiting that had no
> fpu state allocated. Maybe some libc changes could change this (if we want),
> but on the other hand this clearly points out that the better solution for
> this instance of a per cpu unit would be to have it preallocated in every
> lwp.

That's probably due to memcpy()/memset().  Maybe the FPU in use bits 
should be cleared at the end of memcpy() and memset() so the kernel 
doesn't have to save the state.

Eduardo