linux-kernel - Linux kernel cgroup v2 CFS - CPU throttled

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Message-ID: <CAL93h0F7Zek82uXW5-5mv8AfE9cQk33wXySupKcu+6NvO=Aw+w@mail.gmail.com>
Date: Sat, 11 Jan 2025 13:48:44 +0200
From: Alexandru Lazarev <alexandru.lazarev@...il.com>
To: linux-kernel@...r.kernel.org
Subject: Linux kernel cgroup v2 CFS - CPU throttled_usec accounting?

Hi community,

My question:
In Linux kernel cgroup v2’s CFS scheduler, how is cpu.stat
throttled_usec accounted when a cgroup with multiple threads gets
throttled during a single quota period? Specifically, is
throttled_usec tracked as the total wall-clock time that the cgroup
was throttled as a whole, or is it a sum of the throttled times of all
individual threads?

Kernel Version: "5.14.0-284.11.1.el9_2.x86_64 #1 SMP PREEMPT_DYNAMIC
Tue May 9 11:41:53 PDT 2023 x86_64 x86_64 x86_64 GNU/Linux" Distro:
Oracle Linux 9.x

Regards,

AlexL