From owner-freebsd-current  Sun Oct 22 15:32:39 2000
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To: jhb@FreeBSD.ORG
Cc: valentin@valcho.net, current@FreeBSD.ORG, null@pozo.com
Subject: RE: sys/i386/i386/machdep.c:cpu_idle() changes causes this Was:
From: Tor.Egge@fast.no
In-Reply-To: Your message of "Fri, 20 Oct 2000 13:21:49 -0700 (PDT)"
References: <XFMail.001020132149.jhb@FreeBSD.org>
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> 
> On 20-Oct-00 Valentin Chopov wrote:
> > I found that if I remove  #ifndef SMP /#endif  in:
> 
> Errr, this doesn't really make sense, and if anything is probably
> hiding the problem.  Also, this change will potentially increase
> interrupt latency even further on SMP machines.

Interrupts are disabled if Giant is busy in vm_page_zero_idle, thus
the idle proc calls mi_switch with interrupts disabled and the process
being scheduled starts running with interrupts disabled.

I suggest removing the asm statement from vm_page_zero_idle as a first
stage in rewriting vm_page_zero_idle.

- Tor Egge


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