linux-kernel - Re: [RFC 00/32] making inode time stamps y2038 ready

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Message-ID: <538FB570.8000502@zytor.com>
Date:	Wed, 04 Jun 2014 17:10:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Dave Chinner <david@...morbit.com>, hch@...radead.org,
	linux-mtd@...ts.infradead.org, logfs@...fs.org,
	linux-afs@...ts.infradead.org,
	"Joseph S. Myers" <joseph@...esourcery.com>,
	linux-arch@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-scsi@...r.kernel.org, ceph-devel@...r.kernel.org,
	cluster-devel@...hat.com, coda@...cmu.edu, geert@...ux-m68k.org,
	linux-ext4@...r.kernel.org, codalist@...emann.coda.cs.cmu.edu,
	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-kernel@...r.kernel.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

On 06/04/2014 12:24 PM, Arnd Bergmann wrote:
> 
> For other timekeeping stuff in the kernel, I agree that using some
> 64-bit representation (nanoseconds, 32/32 unsigned seconds/nanoseconds,
> ...) has advantages, that's exactly the point I was making earlier
> against simply extending the internal time_t/timespec to 64-bit
> seconds for everything.
> 

How much of a performance issue is it to make time_t 64 bits, and for
the bits there are, how hard are they to fix?

	-hpa


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