Re: [patch 1/13] Qsort

[Mike Waychison]

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Andi Kleen wrote:
>>How about a shell sort?  if the data is mostly sorted shell sort beats 
>>qsort lots of times, and since the data sets are often small in-kernel, 
>>shell sorts O(n^2) behaviour won't harm it too much, shell sort is also 
>>faster if the data is already completely sorted. Shell sort is certainly 
>>not the simplest algorithm around, but I think (without having done any 
>>tests) that it would probably do pretty well for in-kernel use... Then 
>>again, I've known to be wrong :)
> 
> 
> I like shell sort for small data sets too. And I agree it would be 
> appropiate for the kernel.
> 

FWIW, we already have a Shell sort for the ngroups stuff in
kernel/sys.c:groups_sort() that could be made generic.

- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice

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