linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <20070805203602.GB25107@infradead.org>
Date:	Sun, 5 Aug 2007 21:36:02 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	J??rn Engel <joern@...fs.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	miklos@...redi.hu, akpm@...ux-foundation.org, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk, david@...g.hm
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

On Sat, Aug 04, 2007 at 09:42:59PM +0200, J??rn Engel wrote:
> On Sat, 4 August 2007 21:26:15 +0200, J??rn Engel wrote:
> > 
> > Given the choice between only "atime" and "noatime" I'd agree with you.
> > Heck, I use it myself.  But "relatime" seems to combine the best of both
> > worlds.  It currently just suffers from mount not supporting it in any
> > relevant distro.
> 
> And here is a completely untested patch to enable it by default.  Ingo,
> can you see how good this fares compared to "atime" and
> "noatime,nodiratime"?

Umm, no f**king way.  atime selection is 100% policy and belongs into
userspace.  Add to that the problem that we can't actually re-enable
atimes because of the way the vfs-level mount flags API is designed.
Instead of doing such a fugly kernel patch just talk to the handfull
of distributions that matter to update their defaults.

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