Date: Thu, 1 Nov 2001 09:52:45 +0800 From: "David Xu" <davidx@viasoft.com.cn> To: "Peter Wemm" <peter@wemm.org> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: Re: pmap_collect() and PG_UNMANAGED Message-ID: <002f01c16277$e8ac22b0$ef01a8c0@davidwnt> References: <20011101014322.1954A3808@overcee.netplex.com.au>
next in thread | previous in thread | raw e-mail | index | archive | help
----- Original Message -----=20
From: "Peter Wemm" <peter@wemm.org>
To: "David Xu" <davidx@viasoft.com.cn>
Cc: <freebsd-hackers@FreeBSD.ORG>
Sent: Thursday, November 01, 2001 9:43 AM
Subject: Re: pmap_collect() and PG_UNMANAGED=20
> "David Xu" wrote:
> > This is a multi-part message in MIME format.
> >=20
> > ------=3D_NextPart_000_000C_01C162B1.0ECE7770
> > Content-Type: text/plain;
> > charset=3D"gb2312"
> > Content-Transfer-Encoding: quoted-printable
> >=20
> > Hi,
> >=20
> > is there any reason why pmap_collect() in /sys/i386/i386/pmap.c =
does =3D
> > not
> > check PG_UNMANAGED flag? unmanaged page does not have pv_entry =3D
> > associated,
> > so call pmap_remove_all() has side effect, PG_MAPPED and =
PG_WRITEABLE =3D
> > are=3D20
> > roughly cleared.
> >=20
> > --
> > David Xu
>=20
> Did you have something like this in mind?
>=20
> @@ -1729,7 +1729,7 @@
> for(i =3D 0; i < vm_page_array_size; i++) {
> m =3D &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);
> }
>=20
Yes, I have changed and tested it yesterday, I have pushed a memory hog =
program into=20
system, run it about half an hour, almost every program was swapped out, =
still without
cause any problem, it seems it is safe to add this flag.
> BTW; please stop posting MIME/HTML onto mailing lists.
>=20
Sorry, my MS Outlook express sucks, I will replace it with better one!
> 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
--
David Xu
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?002f01c16277$e8ac22b0$ef01a8c0>