linux-kernel - [PATCH v4 3/3] docs: cgroup-v1: clarify that domain levels are system-specific

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Message-Id: <42b177a2e897cdf880caf9c2025f5b609e820334.1714488502.git.vitaly@bursov.com>
Date: Tue, 30 Apr 2024 18:05:25 +0300
From: Vitalii Bursov <vitaly@...sov.com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Vitalii Bursov <vitaly@...sov.com>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: [PATCH v4 3/3] docs: cgroup-v1: clarify that domain levels are system-specific

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

Signed-off-by: Vitalii Bursov <vitaly@...sov.com>
Acked-by: Vincent Guittot <vincent.guittot@...aro.org>
Reviewed-by: Valentin Schneider <vschneid@...hat.com>
---
 Documentation/admin-guide/cgroup-v1/cpusets.rst | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/cgroup-v1/cpusets.rst b/Documentation/admin-guide/cgroup-v1/cpusets.rst
index 7d3415eea05d..f401af5e2f09 100644
--- a/Documentation/admin-guide/cgroup-v1/cpusets.rst
+++ b/Documentation/admin-guide/cgroup-v1/cpusets.rst
@@ -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
 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.
 
 ====== ===========================================================
@@ -581,6 +581,11 @@ otherwise initial value -1 that indicates the cpuset has no request.
    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
 can be changed using the relax_domain_level= boot parameter.
 
-- 
2.20.1