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SubjectRe: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]
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On Saturday 17 July 2010 07:51:30 Mark Harris wrote:
> David Howells wrote:
> > With a 2:2 split between exponent
> > (tv_gran_units) and mantissa (tv_granularity), you can do:
> >
> > UNIT SECONDS/UNIT EXPONENT MANTISSA
> > nanoseconds 0.000000001 -9 1
> > microseconds 0.000001 -6 1
> > millseconds 0.001 -3 1
> > seconds 1 0 1
> > minutes 60 1 6
> > hours 3600 2 36
> > days 86400 2 864
> > weeks 604800 2 6048
>
> At least for the in-tree filesystems, I do not see any that keep
> timestamps with a granularity larger than 2s. For that, a simple
> 32-bit tv_granularity in nanoseconds (not limited to 1e9) would
> suffice, and there is no need for the complexity of dealing with
> a separate exponent.

Yes, good point. That would indeed be a significant simplification.

Arnd


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