Date: Mon, 25 Jan 2010 10:00:14 GMT From: Peter Jeremy <peterjeremy@acm.org> To: freebsd-fs@FreeBSD.org Subject: Re: kern/143184: [zfs] [lor] zfs/bufwait LOR Message-ID: <201001251000.o0PA0Eqo077336@freefall.freebsd.org>
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The following reply was made to PR kern/143184; it has been noted by GNATS. From: Peter Jeremy <peterjeremy@acm.org> To: FreeBSD-gnats-submit@FreeBSD.org, freebsd-bugs@FreeBSD.org Cc: Subject: Re: kern/143184: [zfs] [lor] zfs/bufwait LOR Date: Mon, 25 Jan 2010 20:51:40 +1100 --h31gzZEtNLTqOjlF Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Archive followup in -stable: On 2010-Jan-25 11:24:11 +0200, Kostik Belousov <kostikbel@gmail.com> wrote: >On Mon, Jan 25, 2010 at 07:07:00PM +1100, Peter Jeremy wrote: >> I had the following crop up recently in 8-STABLE/amd64 from end of >> November. It's been reported as kern/143184. >Basically, page containing the buffer for read(2) is swapped out. >This causes page fault in copyout(9) and entry into vm subsystem >while zfs vnode lock is held. > >If the buffer is backed by e.g. UFS vnode instead of anonymous >memory, you would get UFS/zfs LOR. > >The problem is generic, I am working on the solution in collaboration >with Peter Holm, basing on the Jeff Roberson idea. --=20 Peter Jeremy --h31gzZEtNLTqOjlF Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAktdaawACgkQ/opHv/APuIeonwCgp1EIoAGldB1BjSpDlmC3Pr40 pv4AnRukj/ieQrITLKCn33yzGcgeWNC6 =+uuT -----END PGP SIGNATURE----- --h31gzZEtNLTqOjlF--
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