linux-kernel - [PATCH v3 0/2] Exposing nice CPU usage to userspace

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Message-ID: <20240923142006.3592304-1-joshua.hahnjy@gmail.com>
Date: Mon, 23 Sep 2024 07:20:04 -0700
From: Joshua Hahn <joshua.hahnjy@...il.com>
To: tj@...nel.org
Cc: cgroups@...r.kernel.org,
	hannes@...xchg.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	lizefan.x@...edance.com,
	mkoutny@...e.com,
	shuah@...nel.org
Subject: [PATCH v3 0/2] Exposing nice CPU usage to userspace 

From: Joshua Hahn <joshua.hahn6@...il.com>

v2 -> v3: Signed-off-by & renamed subject for clarity.
v1 -> v2: Edited commit messages for clarity.

Niced CPU usage is a metric reported in host-level /prot/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 gauge 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 users to accurately 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