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Message-ID: <57071155-5a08-4579-9189-92d442cd65e7@email.android.com>
Date:	Sat, 31 May 2014 12:34:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Richard Cochran <richardcochran@...il.com>,
	Arnd Bergmann <arnd@...db.de>
CC:	linux-kernel@...r.kernel.org, hch@...radead.org,
	linux-mtd@...ts.infradead.org, logfs@...fs.org,
	linux-afs@...ts.infradead.org, joseph@...esourcery.com,
	linux-arch@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-scsi@...r.kernel.org, ceph-devel@...r.kernel.org,
	codalist@...EMANN.coda.cs.cmu.edu, cluster-devel@...hat.com,
	coda@...cmu.edu, geert@...ux-m68k.org, linux-ext4@...r.kernel.org,
	fuse-devel@...ts.sourceforge.net, reiserfs-devel@...r.kernel.org,
	xfs@....sgi.com, john.stultz@...aro.org, tglx@...utronix.de,
	linux-nfs@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
	samba-technical@...ts.samba.org,
	linux-f2fs-devel@...ts.sourceforge.net, ocfs2-devel@....oracle.com,
	linux-fsdevel@...r.kernel.org, lftan@...era.com,
	linux-btrfs@...r.kernel.org
Subject: Re: [RFC 00/32] making inode time stamps y2038 ready

Typically they are using 64-bit signed seconds.

On May 31, 2014 11:22:37 AM PDT, Richard Cochran <richardcochran@...il.com> wrote:
>On Sat, May 31, 2014 at 05:23:02PM +0200, Arnd Bergmann wrote:
>> 
>> It's an approximation:
>
>(Approximately never ;)
>
>> with 64-bit timestamps, you can represent close to 300 billion
>> years, which is way past the time that our planet can sustain
>> life of any form[1].
>
>Did you mean mean 64 bits worth of seconds?
>
>  2^64 / (3600*24*365) = 584,942,417,355
>
>That is more than 300 billion years, and still, it is not quite the
>same as "never".
>
>In any case, that term is not too helpful in the comparison table,
>IMHO. One could think that some sort of clever running count relative
>to the last mount time was implied.
>
>Thanks,
>Richard
>
>[1] You are forgetting the immortal robotic overlords.

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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