linux-kernel - Re: [patch] implement smarter atime updates support

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Message-ID: <20070805210446.57aa66f6@the-village.bc.nu>
Date:	Sun, 5 Aug 2007 21:04:46 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jakob Oestergaard <jakob@...hought.net>,
	Jeff Garzik <jeff@...zik.org>, miklos@...redi.hu,
	akpm@...ux-foundation.org, neilb@...e.de, dgc@....com,
	tomoki.sekiyama.qu@...achi.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	nikita@...sterfs.com, trond.myklebust@....uio.no,
	yingchao.zhou@...il.com, richard@....demon.co.uk, david@...g.hm
Subject: Re: [patch] implement smarter atime updates support

O> you might want to add
> 
> 	/* 
> 	 * if the inode is dirty already, do the atime update since
> 	 * we'll be doing the disk IO anyway to clean the inode.
> 	 */
> 	if (inode->i_state & I_DIRTY)
> 		return 1;

This makes the actual result somewhat less predictable. Is that wise ?
Right now its clear what happens based on what user sequence of events
and that this is easily repeatable.
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