linux-kernel - [PATCH v2 2/2] Documentation: scheduler: ask users to set sched

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Date:   Fri, 13 Nov 2020 11:31:29 +1300
From:   Barry Song <song.bao.hua@...ilicon.com>
To:     <corbet@....net>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linuxarm@...wei.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Mel Gorman" <mgorman@...e.de>, Adrian Freund <adrian@...und.io>,
        Barry Song <song.bao.hua@...ilicon.com>
Subject: [PATCH v2 2/2] Documentation: scheduler: ask users to set sched_debug cmdline

From: Valentin Schneider <valentin.schneider@....com>

To print the schedule debug information, users need to set sched_debug
cmdline or enable it by sysfs entry.

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Adrian Freund <adrian@...und.io>
Signed-off-by: Valentin Schneider <valentin.schneider@....com>
Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
---
 Documentation/scheduler/sched-domains.rst | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Documentation/scheduler/sched-domains.rst b/Documentation/scheduler/sched-domains.rst
index 55983b7e1098..8582fa5e9170 100644
--- a/Documentation/scheduler/sched-domains.rst
+++ b/Documentation/scheduler/sched-domains.rst
@@ -74,6 +74,8 @@ for a given topology level by creating a sched_domain_topology_level array and
 calling set_sched_topology() with this array as the parameter.
 
 The sched-domains debugging infrastructure can be enabled by enabling
-CONFIG_SCHED_DEBUG. This enables an error checking parse of the sched domains
-which should catch most possible errors (described above). It also prints out
-the domain structure in a visual format.
+CONFIG_SCHED_DEBUG and adding 'sched_debug' to your cmdline. If you forgot to
+tweak your cmdline, you can also flip the /sys/kernel/debug/sched_debug
+knob. This enables an error checking parse of the sched domains which should
+catch most possible errors (described above). It also prints out the domain
+structure in a visual format.
-- 
2.25.1