Re: [RFC] speeding up the stat() family of system calls...

[H. Peter Anvin]

On 12/26/2013 11:00 AM, Linus Torvalds wrote:
> 
> Interestingly, looking at the cp_new_stat() profiles, the games we
> play to get efficient range checking seem to actually hurt us. Maybe
> it's the "sbb" that is just expensive, or maybe it's turning a (very
> predictable) conditional branch into a data dependency chain instead.
> Or maybe it's just random noise in my profiles that happened to make
> those sbb's look bad.
> 

Much to my surprise, this patch adds almost 10K of text to an
"allyesconfig" build.  I wouldn't have expected it.  I'll look at it
some more tomorrow.

	-hpa


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