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Werner Koch e100ace7f8
dirmngr: Improve domaininfo cache update algorithm.
* dirmngr/domaininfo.c (struct domaininfo_s): Add field keepmark.
(insert_or_update): Implement new update algorithm.

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The old algorithm limited the length of a bucket chain by purging the
last 50% or the entries.  Thus the first domains entered into the
cache were never purged.  The new algorithm is a bit better: It also
limits the chain length on overflow to 50% but tries to keep the
entries indicating that a WKD is available in the cache.  If there is
still space to keep more, those which clearly do not support WKD are
also kept.

Signed-off-by: Werner Koch <wk@gnupg.org>
2019-04-02 13:22:32 +02:00
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