[tip: sched/core] delayacct: Document task_delayacct sysctl

[tip-bot2 for Mel Gorman]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     fcb501704554eebfd27e3220b0540997fd2b24a8
Gitweb:        https://git.kernel.org/tip/fcb501704554eebfd27e3220b0540997fd2b24a8
Author:        Mel Gorman <mgorman@xxxxxxx>
AuthorDate:    Wed, 12 May 2021 12:40:35 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 18 May 2021 12:53:53 +02:00

delayacct: Document task_delayacct sysctl

Update sysctl/kernel.rst.

Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20210512114035.GH3672@xxxxxxx
---
 Documentation/admin-guide/sysctl/kernel.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 1d56a6b..ebd2f99 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -1087,6 +1087,13 @@ Model available). If your platform happens to meet the
 requirements for EAS but you do not want to use it, change
 this value to 0.
 
+task_delayacct
+===============
+
+Enables/disables task delay accounting (see
+:doc:`accounting/delay-accounting.rst`). Enabling this feature incurs
+a small amount of overhead in the scheduler but is useful for debugging
+and performance tuning. It is required by some tools such as iotop.
 
 sched_schedstats
 ================