From owner-freebsd-current Mon Jan 29 9:16: 6 2001 Delivered-To: freebsd-current@freebsd.org Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (Postfix) with ESMTP id 7E5FD37B404 for ; Mon, 29 Jan 2001 09:15:45 -0800 (PST) Received: from beppo (beppo [192.67.166.79]) by feral.com (8.9.3/8.9.3) with ESMTP id JAA06230; Mon, 29 Jan 2001 09:15:36 -0800 Date: Mon, 29 Jan 2001 09:15:37 -0800 (PST) From: Matthew Jacob Reply-To: mjacob@feral.com To: Peter Wemm Cc: Bruce Evans , current@FreeBSD.ORG Subject: Re: config(8) broken In-Reply-To: <200101291621.f0TGL4453408@mobile.wemm.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG *groan* I'm having trouble believing that *config* of all things is now dependent on time to avoid bugs... This is *one* for the books.... On Mon, 29 Jan 2001, Peter Wemm wrote: > Bruce Evans wrote: > > On Mon, 29 Jan 2001, Peter Wemm wrote: > > > > > Bruce Evans wrote: > > > > Config now removes almost all headers: > > > > ... > > > > This is starting from compile directory populated by a previous version > > > > of config. Starting from scratch, config seems to work for the first > > > > run. The second run complains about all headers, deletes them all, and > > > > doesn't create any. The third run seems to work... > > > > > > What are the chances that you did this on a mount -o noatime file system? > > > > Very high :-). > > Heh. :-) > > > I'm surprised the bug doesn't affect fast machines, since config doesn't > > seem to sleep for >= 1 second to ensure that the atimes advance with > > the standard mount options. > > I was primarily testing it on a dual P3-733 w/ 1G ram which was running > config nearly instantly. I never saw this problem until I tested it > on a fresh machine that (by sheer chance) happened to be running noatime (it > was a laptop). For what it's worth, I did roll the start time back by one > second to give a bit more comfort - getting rid of the trays isn't all that > critical. > > For UFS at least, we seem to update the atime instantly but schedule > writeback to the inode "whenever". > > 148# date ; ls -lutT foo1 ; cat foo1 ; ls -lutT foo1; date > Mon Jan 29 08:18:02 PST 2001 > -rw-r--r-- 1 root wheel 4 Jan 29 08:16:25 2001 foo1 > foo > -rw-r--r-- 1 root wheel 4 Jan 29 08:18:02 2001 foo1 > Mon Jan 29 08:18:02 PST 2001 > > This is all within the same second "tick" and the atime change was visible. > > > Bruce > > > 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 > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message