linux-kernel - Re: Proposal: Use hi-res clock for file timestamps

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Message-ID: <AANLkTi=BB-zVFyCLgC+RWai9FFecaOad=pUC2=XFnY3J@mail.gmail.com>
Date:	Tue, 17 Aug 2010 12:43:10 -0700
From:	"Patrick J. LoPresti" <lopresti@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Andi Kleen <andi@...stfloor.org>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Proposal: Use hi-res clock for file timestamps

On Tue, Aug 17, 2010 at 12:54 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> Is there any objection to the mount option I am proposing?
>
> I have none. I doubt I'd use it as it would be too expensive on system
> performance for some of my boxes, while having an incrementing value is
> cheap.
>
> I don't see the two as conflicting - in fact the bits you need to do the
> mount option are the bits you also need to do the counter version as
> well. One fixes ordering at no real cost, the other adds high res
> timestamps, both are useful.

A mount option could also allow a choice of timestamp resolutions:

Traditional (i.e., fast)
Alan Cox NFS hack (a tad slower but should fix NFS)
High-res time (slowest but most accurate)

I will work on a patch this week (weekend at the latest).

Thanks, Alan.

 - Pat
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