linux-kernel - Re: [PATCH v2 2/2] relatime: Allow making relatime the default behaviour

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Message-ID: <20081129135742.GC11959@logfs.org>
Date:	Sat, 29 Nov 2008 14:57:42 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Matthew Garrett <mjg@...hat.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mingo@...hat.com, val.henson@...il.com
Subject: Re: [PATCH v2 2/2] relatime: Allow making relatime the default behaviour


On Sat, 29 November 2008 06:03:08 -0700, Matthew Wilcox wrote:
> 
> That would imply that relatime could be different per-mountpoint.
> 
> I favour not making it configurable at all.

I guess some amount if configuration may be necessary.  If you go back
to the beginning of the thread...

On Wed, 26 November 2008 19:54:57 +0000, Matthew Garrett wrote:
> 
> Allow atime to be updated once per day even with relatime enabled.  This 
> lets utilities like tmpreaper (which deletes files based on last access 
> time) continue working.

...and check the tmpreaper manpage, you will notice that tmpreaper can
be configured as well.  So relatime has a default timeout of T and
tmpreaper is configured to delete files after 1/2 T (never mind what T
might be), the system breaks.  Guessing a value of T that is good enough
for everyone is a complicated business, so one configurable makes sense
imo.

One per mountpoint is rather silly, of course.

Jörn

-- 
Mundie uses a textbook tactic of manipulation: start with some
reasonable talk, and lead the audience to an unreasonable conclusion.
-- Bruce Perens
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