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Poul-Henning Kamp authored
The cruical difference is that we can remove from a VLIST without having the head of the VLIST, which comes handy when expiring a non-instantiated object from a -spersistent stevedore. We flip the LRU list around, so that the frontmost element has not been accessed for the longest time, and simulate tail-inserts by putting a senteniel on the tail of the list. Presently the senteniel is a full objcore, which is a non-issue with few machines having more than a handful of stevedores, but once the persistent stevedore moves to per-segment LRU lists, this needs to be addressed, probably by wrapping the LRU linkage in a separate structure. git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4211 d4fa192b-c00b-0410-8231-f00ffab90ce4
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