Date: Mon, 29 Jan 2001 08:21:04 -0800 From: Peter Wemm <peter@netplex.com.au> To: Bruce Evans <bde@zeta.org.au> Cc: current@freebsd.org Subject: Re: config(8) broken Message-ID: <200101291621.f0TGL4453408@mobile.wemm.org> In-Reply-To: <Pine.BSF.4.21.0101300236340.2753-100000@besplex.bde.org>
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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
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