Hello gentlemen, I'm an aspiring linuxoid and this question I practically does not sleep — very interesting.
How is (if there is) the kernel update for "combat" serrah, where the thread in the data center from a hosting company guarantees uptime of 99.9%. After all, without a reboot of the machine as far as I know the new kernel does not move? So the kernel is not updated? What follows then is the closure of holes, which are detected with time in the kernel? Maybe there's something to read on the subject, and on highly loaded systems as a whole (in particular more theory to work with them are interested) or this level of secrets?