GSOC 2013 Status: caching plugin week 13

I mostly fiddled around with timerfds this week. I wanted to add timers so that statistics could easily be tracked without keeping a global mutex which caused some performance regression. I also tried to implement dynamically deciding on limits for the number of cached requests and buffer pipes. Depending on requests/sec the system could be more aggressive and then fall down to low mem usage when its cold. this introduced quite a lot of bugs and still pending, but I should push it soon and polish it up.





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