Linux kernel cgroup v2 CFS - CPU throttled_usec accounting?

Alexandru Lazarev <[email protected]> Sat, 11 Jan 2025 13:28:24 +0200

Newsgroups	org.kernelnewbies.kernelnewbies
Message-ID	<CAL93h0Em_7YH0Ju3xE+y2jFQUuycyZzuYt4TixXJ_Z9DZBfMgQ@mail.gmail.com>

Hi community,

My question:
In Linux kernel cgroup v2’s CFS scheduler, how is cpu.max
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

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