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Message-ID: <20231201005203.309873-1-joshdon@google.com> Date: Thu, 30 Nov 2023 16:52:03 -0800 From: Josh Don <joshdon@...gle.com> To: Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>, Johannes Weiner <hannes@...xchg.org>, Jonathan Corbet <corbet@....net> Cc: cgroups@...r.kernel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Josh Don <joshdon@...gle.com> Subject: [PATCH] cgroup: Fix documentation for cpu.idle Two problems: - cpu.idle cgroups show up with 0 weight, correct the documentation to indicate this. - cpu.idle has no entry describing it. Signed-off-by: Josh Don <joshdon@...gle.com> --- Documentation/admin-guide/cgroup-v2.rst | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 3f85254f3cef..9debf02bcb39 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1093,7 +1093,11 @@ All time durations are in microseconds. A read-write single value file which exists on non-root cgroups. The default is "100". - The weight in the range [1, 10000]. + For non idle groups (cpu.idle = 0), the weight is in the + range [1, 10000]. + + If the cgroup has been configured to be SCHED_IDLE (cpu.idle = 1), + then the weight will show as a 0. cpu.weight.nice A read-write single value file which exists on non-root @@ -1157,6 +1161,16 @@ All time durations are in microseconds. values similar to the sched_setattr(2). This maximum utilization value is used to clamp the task specific maximum utilization clamp. + cpu.idle + A read-write single value file which exists on non-root cgroups. + The default is 0. + + This is the cgroup analog of the per-task SCHED_IDLE sched policy. + Setting this value to a 1 will make the scheduling policy of the + cgroup SCHED_IDLE. The threads inside the cgroup will retain their + own relative priorities, but the cgroup itself will be treated as + very low priority relative to its peers. + Memory -- 2.43.0.rc2.451.g8631bc7472-goog
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