From owner-freebsd-current@FreeBSD.ORG Fri Apr 30 07:02:17 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0F22016A4D0 for ; Fri, 30 Apr 2004 07:02:17 -0700 (PDT) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5C40943D1F for ; Fri, 30 Apr 2004 07:02:16 -0700 (PDT) (envelope-from phk@phk.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.11/8.12.11) with ESMTP id i3UE26Su007433; Fri, 30 Apr 2004 16:02:06 +0200 (CEST) (envelope-from phk@phk.freebsd.dk) To: "M. Warner Losh" From: "Poul-Henning Kamp" In-Reply-To: Your message of "Fri, 30 Apr 2004 07:54:48 MDT." <20040430.075448.70646001.imp@bsdimp.com> Date: Fri, 30 Apr 2004 16:02:06 +0200 Message-ID: <7432.1083333726@critter.freebsd.dk> cc: freebsd-current@freebsd.org Subject: Re: DEVFS in a chroot? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Apr 2004 14:02:17 -0000 In message <20040430.075448.70646001.imp@bsdimp.com>, "M. Warner Losh" writes: >In message: <6695.1083331489@critter.freebsd.dk> > "Poul-Henning Kamp" writes: >: In message <20040430.070341.26991317.imp@bsdimp.com>, "M. Warner Losh" writes: >: >In message: <5473.1083327210@critter.freebsd.dk> >: > "Poul-Henning Kamp" writes: >: >: >Should I mount /var/chroot/dev as type devfs? >: >: >: >: Yes: >: >: >: >: mount -t devfs randomargument /var/chroot/dev >: > >: >What if I have hundreds of these chroots? We build our product inside >: >a chroot right now and I'm worried what the overhead of >: >mounting/unmounting this for every build would be... >: >: As far as I recall, our mountlist handling is not optimised for >: hundreds of simultaneous mountpoints: we basically walk the list. >: That said, I belive we only do so during the actual mount/unmount >: operations, so I do not think there is a performance issue as such. > >Would the performance issues be mitigated by mounting/unmounting devfs >all the time? Eg, only mount it while it is actively being used? I think you would actually make it worse that way... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.