kern/78474 for 5.4? (kernel stack swapout problem again)

[Doug White]

On Thu, 21 Apr 2005, David Xu wrote:

> Sam Lawrance wrote:
>
> >Will this problem:
> >
> >Swapped out procs not brought in immediately after child exits
> >http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/78474
> >
> >be dealt with for the release of 5.4?
> >
> >Perhaps I'm the only FreeBSD user with swapped out processes ;-)
> >
> >-Sam
> >
> >
> >
> >
>
> I have noticed that current spinlock implementation no longer means that
> CPU must be in critical region (critical_enter is called), even previous
> hack TDP_WAKEPROC0 is no longer correct, :(, I think it is the time to
> disable swapout.

I'm sorry, I can't parse your double negative.  On -CURRENT critical
sections (entered with critical_enter()) no longer disable interrupts, but
do inhibit preemption.  But spinlocks still do critical_enter() (see
spinlock_enter()).

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org