From: "Petr Vandrovec" <VANDROVE@vc.cvut.cz>
To: Padraig Brady <padraig@antefacto.com>
Cc: Alex Larsson <alexl@redhat.com>,
Ulrich Drepper <drepper@cygnus.com>,
linux-kernel@vger.kernel.org
Subject: Re: Finegrained a/c/mtime was Re: Directory notification pr
Date: Fri, 5 Oct 2001 15:27:39 MET-1 [thread overview]
Message-ID: <567F3237EED@vcnet.vc.cvut.cz> (raw)
On 5 Oct 01 at 14:15, Padraig Brady wrote:
> >Another advantage of using the real time instead of a counter is that
> >you can easily merge the both values into a single 64bit value and do
> >arithmetic on it in user space. With a generation counter you would need
> >to work with number pairs, which is much more complex.
> >
> ??
> if (file->mtime != mtime || file->gen_count != gen_count)
> file_changed=1;
make needs comparing timestamps between two files. I cannot imagine
how you can get this working (without network filesystem you can
have global gen_count, but with network filesystem each server has
its own gen_count... and using world-wide nanoseconds instead of world-wide
gen_count looks much simpler to me ;-) )
Best regards,
Petr Vandrovec
vandrove@vc.cvut.cz
next reply other threads:[~2001-10-05 13:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-05 15:27 Petr Vandrovec [this message]
2001-10-05 13:41 ` Jonathan Lundell
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