[WIP][PATCH] Improve tdb add/modify/delete loop perf by almost 20%

[Andrew Bartlett]

I've been looking into where we spend our time when we are in an
add/modify/delete loop.

Thankfully this is now linear growth in time, but we can still address
parts of that linear growth (earlier Samba versions were superlinear) .

Please have a look at the attached, as if they hold up under test I
would like to push these tomorrow after further refinement.

We can presumably also apply the same approach to the reindex traverse.

This came our of research trying to prove a more complex approach,
keeping our in-memory index values around longer, but making it faster
to load it from the tdb seems a good first step.

Please comment

Andrew Bartlett
-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba


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