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Date: Sun, 7 Jul 2002 16:11:06 -0400
From: Jake Burkholder <jake@locore.ca>
To: Alan Cox <alc@cs.rice.edu>
Cc: Alan Cox <alc@FreeBSD.org>, cvs-committers@FreeBSD.org,
	cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/vm vm_zeroidle.c
Message-ID: <20020707161105.D14627@locore.ca>
References: <200207071927.g67JRvwi019399@freefall.freebsd.org> <20020707193742.GX11391@cs.rice.edu>
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In-Reply-To: <20020707193742.GX11391@cs.rice.edu>; from alc@cs.rice.edu on Sun, Jul 07, 2002 at 02:37:42PM -0500
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Apparently, On Sun, Jul 07, 2002 at 02:37:42PM -0500,
	Alan Cox said words to the effect of;

> On Sun, Jul 07, 2002 at 12:27:57PM -0700, Alan Cox wrote:
> > alc         2002/07/07 12:27:57 PDT
> > 
> >   Modified files:
> >     sys/vm               vm_zeroidle.c 
> >   Log:
> >    o Lock accesses to the free queue(s) in vm_page_zero_idle().
> >   
> >   Revision  Changes    Path
> >   1.10      +4 -0      src/sys/vm/vm_zeroidle.c
> 
> I believe that Giant could be removed from vm_page_zero_idle()
> on alpha and ia64.  i386's pmap_zero_page() is not MPSAFE.
> I'm not sure about sparc64.

(re sparc64)

The cache flush call is not MP-safe yet, because the IPI code isn't,
but it won't take much to make it so.  To do the zeroing it accesses
physical addresses directly, similar to K0SEG addresses on alpha and
RR7 addresses on ia64, which is MP-safe.

Jake

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