From: Joshua Hahn joshua.hahn6@gmail.com
Niced CPU usage is a metric reported in host-level /proc/stat, but is not reported in cgroup-level statistics in cpu.stat. However, when a host contains multiple tasks across different workloads, it becomes difficult to gauage how much of the task is being spent on niced processes based on /proc/stat alone, since host-level metrics do not provide this cgroup-level granularity.
Exposing this metric will allow load balancers to correctly probe the niced CPU metric for each workload, and make more informed decisions when directing higher priority tasks.
Joshua Hahn (2): Tracking cgroup-level niced CPU time Selftests for niced CPU statistics
include/linux/cgroup-defs.h | 1 + kernel/cgroup/rstat.c | 16 ++++- tools/testing/selftests/cgroup/test_cpu.c | 72 +++++++++++++++++++++++ 3 files changed, 86 insertions(+), 3 deletions(-)