Google Linux servers hit with $5m patent infringement verdict

This isn't google-specific; any company using the linux kernel is vulnerable to being sued over infringing this patent.<p><a href="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&#38;Sect2=HITOFF&#38;d=PALL&#38;p=1&#38;u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&#38;r=1&#38;f=G&#38;l=50&#38;s1=5893120.PN.&#38;OS=PN/5893120&#38;RS=PN/5893120" rel="nofollow">http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&#38;Sec...</a>

I don't understand what they patented. Is this a patent for a hash table implemented using a linked list with garbage collection? How is this patentable? There should be a ton of 'prior art' concerning the data structures, and garbage collection was certainly around for decades before this patent was filed.