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SubjectRe: [PATCH v4] relatime: Make relatime smarter
On Thu, Nov 27, 2008 at 03:08:39PM -0700, Andreas Dilger wrote:
> On Nov 27, 2008 17:58 +0000, Matthew Garrett wrote:
> > + relatime_interval=
> > + [FS] relative atime update frequency, in seconds.
> > + (default: 1 day: 86400 seconds)
> The one problem with a 1-day default is that cron jobs like updatedb will
> revert to updating the atime on every single file every day. It would be
> better to make it slightly more than 1 day (e.g. 25h) to avoid this and
> at least defer atime updates to every other day for files that are not
> otherwise accessed except by cron.

Doesn't updatedb only access directories, not files? I don't think
relatime implies nodiratime, but certainly the two could both be
specified, and that would fix one of the updatedb problems. Are there
any other common cronjobs you're concerned about?

Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."

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