我们偶尔会遇到 ubuntu 16.04 LTS（内核 4.4.0-34-generic）挂起，我们想知道是否有人有一些线索如何深入了解这个问题。
日志如下所示：
Aug 24 10:02:04 Ubuntu-1404-trusty-64-minimal kernel: [ 2046.519099] perf interrupt took too long (2505 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
Aug 24 10:03:19 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 43 of user ubuntu.
Aug 24 10:06:21 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 44 of user ubuntu.
Aug 24 10:06:22 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 45 of user ubuntu.
Aug 24 10:08:14 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 46 of user ubuntu.
Aug 24 10:17:01 Ubuntu-1404-trusty-64-minimal CRON[150011]: (root) CMD ( cd / && …