Re: [RFC] pte equality tests

[Brian Parris]

I apologise then, i am not very experienced yet with the internals of the
linux kernel, i simply thought that there was a bug and that it was
suggested not to fix it because it's not commonly encountered, next time i
will be sure to not comment unless i fully understand what's being
discussed, thanks for the explanation

On Mon, 3 Jan 2000, Rik van Riel wrote:

> On Sun, 2 Jan 2000, Brian Parris wrote:
> > On Fri, 31 Dec 1999, David S. Miller wrote:
> > >    Date:   Fri, 31 Dec 1999 20:34:31 -0500
> > >    From: Jeff Dike <[e-mail]>
> > > 
> > >    So, would it be reasonable to replace the equality tests with a test like
> > > 
> > > Your analysis is correct (it can/does happen), however I don't
> > > think it happens often enough to worry about it.
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > i hope the above attitude never becomes popular in linux as it
> > seems to be better suited to many MS products
> 
> You seem to be overlooking one thing.
> 
> If the tested version takes 5% longer than the original
> and the exception only occurs in 1% of the cases (saving
> 100% overhead there), then you'll have more overhead
> than you have by not doing that special case.
> 
> Sometimes a situation is so rare that special-casing it
> has the opposite effect then expected.
> 
> regards,
> 
> Rik
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