Comment 88 for bug 985661

Yes, the patch was backported to upstream kernel 3.2.24, which in tern was included in Ubuntu as mentioned. See also bug #1029431 (search for "load-ave") and https://launchpad.net/ubuntu/precise/+source/linux/3.2.0-29.46 (seach for "load-ave")
I don't think it is generally released yet.