Bug#666021: no "page allocation failure"s any more

[Tomas Pospisek <tpo@sourcepole.ch>]

Since upgrading to the 4.5.0-0.bpo.2-amd64 kernel and setting 
"vm.min_free_kbytes = 65536" we have not seen any more "page allocation 
failure" on our servers.

Thus it seems that those two things have fixed the problems.
*t