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

[J. Bruce Fields]

On Wed, Aug 18, 2010 at 07:50:40PM +0200, Andi Kleen wrote:
> >  - nfsd updates it whenever it reads an mtime out of an inode that matches
> >    current_fs_time to the granularity of 1/HZ.
> 
> That means you have a very very hot cache line on a larger system
> if there are a lot of mtime changes. Probably a bad idea.

Only if those mtime changes are also followed immediately by nfsd reads
of the mtime.

That will be the typical case for nfsd writes, though.

--b.
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