PHP5-FPM and 'ondemand'

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http://serverfault.com – I've set up a server with Nginx and PHP5-FPM, and things are running fine. However, as I add more and more sites to the server I see that the memory usage steadily increases, and I've come to the conclusion that PHP5-FPM is to "blame". What I currently do is that I set up a separate PHP5-FPM pool for each site, and configure that pool according to expected traffic. However, with enough sites, I will in the end have a server which just sists on a rather large number of PHP5-FPM "children" which are just waiting for work. I just found out about the ondemand PHP5-FPM mode, which allows me to c (HowTos)