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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. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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