From owner-freebsd-hackers  Wed Oct 31 17:43:31 2001
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To: "David Xu" <davidx@viasoft.com.cn>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: pmap_collect() and PG_UNMANAGED 
In-Reply-To: <000f01c1626e$011ac220$ef01a8c0@davidwnt> 
Date: Wed, 31 Oct 2001 17:43:22 -0800
From: Peter Wemm <peter@wemm.org>
Message-Id: <20011101014322.1954A3808@overcee.netplex.com.au>
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"David Xu" wrote:
> This is a multi-part message in MIME format.
> 
> ------=_NextPart_000_000C_01C162B1.0ECE7770
> Content-Type: text/plain;
> 	charset="gb2312"
> Content-Transfer-Encoding: quoted-printable
> 
> Hi,
> 
>   is there any reason why pmap_collect() in /sys/i386/i386/pmap.c does =
> not
>   check PG_UNMANAGED flag? unmanaged page does not have pv_entry =
> associated,
>   so call pmap_remove_all() has side effect, PG_MAPPED and PG_WRITEABLE =
> are=20
>   roughly cleared.
> 
> --
> David Xu

Did you have something like this in mind?

@@ -1729,7 +1729,7 @@
        for(i = 0; i < vm_page_array_size; i++) {
                m = &vm_page_array[i];
                if (m->wire_count || m->hold_count || m->busy ||
-                   (m->flags & PG_BUSY))
+                   (m->flags & (PG_BUSY | PG_UNMANAGED)))
                        continue;
                pmap_remove_all(m);
        }

BTW; please stop posting MIME/HTML onto mailing lists.

Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5


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