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

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Date:	Sat, 04 Aug 2007 13:13:44 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	J?rn Engel <joern@...fs.org>, Jeff Garzik <jeff@...zik.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, 2007-08-04 at 22:11 +0200, Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > +#ifdef CONFIG_FASTATIME
> > +	if (!(flags & (MNT_NOATIME | MNT_NODIRATIME)))
> > +		mnt_flags |= MNT_RELATIME;
> > +#endif
> 
> btw., "relatime" does not seem to make much of a difference, if i do 
> this:
> 
>   ls -l x ; sync
> 
> on a "relatime" mounted filesystem ('x' is a regular file), then there's 
> disk IO for every such command. Only if i mount it noatime,nodiratime do 
> i get zero disk IO. Or my patch is wrong somehow.

do we have reldiratime ?


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