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docs: cgroup-v1: Clarify that domain levels are system-specific

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Add a clarification that domain levels are system-specific
and where to check for system details.

Signed-off-by: Vitalii Bursov <vitaly@bursov.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Acked-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/42b177a2e897cdf880caf9c2025f5b609e820334.1714488502.git.vitaly@bursov.com
This commit is contained in:
Vitalii Bursov 2024-04-30 18:05:25 +03:00 • committed by Ingo Molnar
parent 287372fa39
commit 0f1c74befa
1 changed files with 6 additions and 1 deletions
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7
Documentation/admin-guide/cgroup-v1/cpusets.rst
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@ -568,7 +568,7 @@ on the next tick. For some applications in special situation, waiting
The 'cpuset.sched_relax_domain_level' file allows you to request changing The 'cpuset.sched_relax_domain_level' file allows you to request changing
this searching range as you like. This file takes int value which this searching range as you like. This file takes int value which
indicates size of searching range in levels ideally as follows, indicates size of searching range in levels approximately as follows,
otherwise initial value -1 that indicates the cpuset has no request. otherwise initial value -1 that indicates the cpuset has no request.
====== =========================================================== ====== ===========================================================
@ -581,6 +581,11 @@ otherwise initial value -1 that indicates the cpuset has no request.
5 search system wide [on NUMA system] 5 search system wide [on NUMA system]
====== =========================================================== ====== ===========================================================
Not all levels can be present and values can change depending on the
system architecture and kernel configuration. Check
/sys/kernel/debug/sched/domains/cpu*/domain*/ for system-specific
details.
The system default is architecture dependent. The system default The system default is architecture dependent. The system default
can be changed using the relax_domain_level= boot parameter. can be changed using the relax_domain_level= boot parameter.