From: Andi Kleen <andi@firstfloor.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>,
"J. Bruce Fields" <bfields@fieldses.org>,
"Patrick J. LoPresti" <lopresti@gmail.com>,
linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Proposal: Use hi-res clock for file timestamps
Date: Wed, 18 Aug 2010 20:53:54 +0200 [thread overview]
Message-ID: <20100818185354.GB6567@basil.fritz.box> (raw)
In-Reply-To: <1282155658.13405.36.camel@localhost>
On Wed, Aug 18, 2010 at 07:20:58PM +0100, David Woodhouse wrote:
> On Tue, 2010-08-17 at 20:29 +0200, Andi Kleen wrote:
> >
> > > - Increment mtime by a nanosecond when necessary.
> >
> > You cannot be more precise than the backing file system: this causes
> > non monotonity when the inodes are flushed (has happened in the past)
>
> Um, can't you? You can't *store* timestamps which are more precise, but
> they can be in cache can't they?
No you can't. The initial implementation did that and it broke someone's
make. After that the VFS was fixed to never be precise than the backing
file system.
-Andi
prev parent reply other threads:[~2010-08-18 18:53 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-13 18:25 Proposal: Use hi-res clock for file timestamps Patrick J. LoPresti
[not found] ` <AANLkTimnyXKahtjaFeSsgcq=xMy-pP3na1jidQhZ-dt2-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-13 18:45 ` john stultz
2010-08-13 18:57 ` Patrick J. LoPresti
2010-08-13 19:09 ` john stultz
[not found] ` <1281726579.2810.10.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2010-08-13 20:53 ` Patrick J. LoPresti
2010-08-14 16:45 ` Patrick J. LoPresti
2010-08-15 1:50 ` Bret Towe
2010-08-17 14:54 ` Andi Kleen
[not found] ` <87aaolwar8.fsf-3rXA9MLqAseW/qJFnhkgxti2O/JbrIOy@public.gmane.org>
2010-08-17 17:41 ` J. Bruce Fields
[not found] ` <20100817174134.GA23176-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2010-08-17 18:29 ` Andi Kleen
2010-08-17 19:04 ` J. Bruce Fields
[not found] ` <20100817190447.GA28049-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2010-08-17 19:18 ` Patrick J. LoPresti
[not found] ` <AANLkTi=w1UA5ZZDBigpxMiL7A7DnbnQhLkg62JZpC6Ri-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-17 19:39 ` Alan Cox
[not found] ` <20100817203941.729830b7-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
2010-08-17 19:29 ` J. Bruce Fields
[not found] ` <20100817192937.GD26609-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2010-08-17 19:52 ` Alan Cox
2010-08-18 5:53 ` Neil Brown
2010-08-18 14:46 ` Patrick J. LoPresti
2010-08-18 17:32 ` J. Bruce Fields
[not found] ` <20100818173203.GC32430-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2010-08-18 18:15 ` Chuck Lever
[not found] ` <0F91AB9D-0E14-4384-ADD6-0A467C3ABFAC-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2010-08-18 23:41 ` Neil Brown
2010-08-19 0:52 ` Neil Brown
2010-08-19 2:08 ` J. Bruce Fields
[not found] ` <20100819020803.GA30151-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2010-08-19 2:44 ` Neil Brown
2010-08-19 22:46 ` J. Bruce Fields
2010-08-18 23:47 ` Neil Brown
2010-08-18 17:50 ` Andi Kleen
2010-08-18 18:54 ` J. Bruce Fields
2010-08-18 19:25 ` Andi Kleen
2010-08-18 19:30 ` J. Bruce Fields
2010-08-17 19:34 ` Patrick J. LoPresti
2010-08-17 19:54 ` Alan Cox
[not found] ` <20100817205441.200ab9a4-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
2010-08-17 19:43 ` Patrick J. LoPresti
[not found] ` <AANLkTi=BB-zVFyCLgC+RWai9FFecaOad=pUC2=XFnY3J-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-17 19:45 ` J. Bruce Fields
2010-08-18 18:12 ` J. Bruce Fields
2010-08-19 1:41 ` john stultz
[not found] ` <AANLkTi=cx31Mgfe7FxJz6LUmTKFR4=9KEBgbFsNLjiSE-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-19 2:31 ` J. Bruce Fields
[not found] ` <20100819023106.GB30151-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2010-08-19 3:17 ` john stultz
2010-08-19 22:53 ` J. Bruce Fields
[not found] ` <20100817182920.GD18161-u0/ZJuX+froe6aEkudXLsA@public.gmane.org>
2010-08-17 18:50 ` Patrick J. LoPresti
2010-08-18 18:20 ` David Woodhouse
2010-08-18 18:32 ` Patrick J. LoPresti
2010-08-18 18:53 ` Andi Kleen [this message]
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