Date: Sun, 6 Sep 2009 23:52:56 +0200 (CEST) From: Alex de Kruijff <samesame@akruijff.dds.nl> To: FreeBSD-gnats-submit@FreeBSD.org Cc: Alex de Kruijff <samesame@akruijff.dds.nl> Subject: ports/138596: [MAINTAINER] sysutils/samesame vlruwk problem Message-ID: <200909062152.n86Lqu5V014142@Server1.lan> Resent-Message-ID: <200909062200.n86M03Nv077668@freefall.freebsd.org>
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>Number: 138596
>Category: ports
>Synopsis: [MAINTAINER] sysutils/samesame vlruwk problem
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: maintainer-update
>Submitter-Id: current-users
>Arrival-Date: Sun Sep 06 22:00:02 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Alex de Kruijff
>Release:
>Organization:
>Environment:
FreeBSD Server1.lan 6.1-RELEASE-p20 FreeBSD 6.1-RELEASE-p20 #0: Wed Nov 14 02:07:49 CET 2007 akruijff@Server1.lan:/temp/obj/temp/src/sys/SERVER-SMP i386
FreeBSD Gateway.lan 7.1-RELEASE-p2 FreeBSD 7.1-RELEASE-p2 #0: Fri Feb 6 03:34:06 CET 2009 akruijff@Gateway.lan:/temp/obj/temp/src/sys/SERVER i386
>Description:
If unlink(2) is called very quicky, very ofter in a small amount of time,
then the system is left in a vlruwk state. 'sysctl -a | grep vn' shows
that there are few free vnodes. It just so happens that my program has a
use for that.
>How-To-Repeat:
Wait for report ports/138590 to be handeld, then
samefile -V and sameln -V should give "SameSame 1.5 ..."
cp -Rp /usr/src /usr/src1
cp -Rp /usr/src /usr/src2
cp -Rp /usr/src /usr/src..
cp -Rp /usr/src /usr/srcN
find /usr/src* -type f | samefile -i > .samefile
sameln -w < .samefile
>Fix:
1) Whe using -w hurts, don't use it. It can still be used in a pipe but
there's little advantage in that.
2) It looks like a problem in the kernel.
3) A work around in the SameSame code:
I'm assuming this is FreeBSD related, therefor I was thinking of patch
file. The patch file should add code that checks the vnodes level. It
can do this by modifing the file src/mainAction.cpp just before the line:
"// Is it time to sync?".
I don't work on this option any time soon. Anyone else is welkomed to.
>Release-Note:
>Audit-Trail:
>Unformatted:
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