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    SubjectRe: [patch 1/13] Qsort
    On Sat, Jan 22, 2005 at 08:29:30PM -0800, Matt Mackall wrote:
    > On Sun, Jan 23, 2005 at 03:39:34AM +0100, Andi Kleen wrote:
    > c) the three-way median selection does help avoid worst-case O(n^2)
    > behavior, which might potentially be triggerable by users in places
    > like XFS where this is used

    XFS's needs are simple - we're just sorting dirents within a
    single directory block or smaller, and sorting EA lists/ACLs -
    all of which are small arrays, so a qsort optimised for small
    arrays suits XFS well. Take care not to put any arrays on the
    stack though, else the CONFIG_4KSTACKS punters won't be happy.


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