Kernel 4.8 was recently released but dev-util/perf is still stuck at version 4.4.4
commit 672fc0b8c265436eba44b3286a115cf19dd97d52 Author: Yixun Lan <dlan@gentoo.org> Date: Tue Feb 28 14:29:30 2017 +0800 dev-util/perf: version bump Gentoo-Bug: 596700 Package-Manager: Portage-2.3.3, Repoman-2.3.1 :100644 100644 f2797b1d42... 8509741420... M dev-util/perf/Manifest :000000 100644 0000000000... b516617b25... A dev-util/perf/perf-4.9.13.ebuild
Thanks.