linux-kernel - [PATCH 0/2] Exposing nice CPU usage to userspace

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Message-ID: <20240823201317.156379-1-joshua.hahn6@gmail.com>
Date: Fri, 23 Aug 2024 13:05:16 -0700
From: Joshua@....codeaurora.org, Hahn@....codeaurora.org,
	joshua.hahn6@...il.com
To: tj@...nel.org
Cc: lizefan.x@...edance.com,
	hannes@...xchg.org,
	mkoutny@...e.com,
	shuah@...nel.org,
	cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 0/2] Exposing nice CPU usage to userspace

From: Joshua Hahn <joshua.hahn6@...il.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(-)

-- 
2.43.5