linux-kernel - [PATCH v1] sched: Mention autogroup disabled behavior

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Message-ID: <20250116124654.2365691-1-pauld@redhat.com>
Date: Thu, 16 Jan 2025 12:46:54 +0000
From: Phil Auld <pauld@...hat.com>
To: Alejandro Colomar <alx@...nel.org>
Cc: linux-man@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] sched: Mention autogroup disabled behavior

The autogroup feature can be contolled at runtime when
built into the kernel. Disabling it in this case still
creates autogroups and still shows the autogroup membership
for the task in /proc.  The scheduler code will just not
use the the autogroup task group.  This can be confusing
to users. Add a sentence to this effect to sched.7 to
point this out.

Signed-off-by: Phil Auld <pauld@...hat.com>
To: Alejandro Colomar <alx@...nel.org>
Cc: <linux-man@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>

---
 man/man7/sched.7 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/man/man7/sched.7 b/man/man7/sched.7
index 71f098e48..f0a708cd7 100644
--- a/man/man7/sched.7
+++ b/man/man7/sched.7
@@ -724,6 +724,8 @@ in the group terminates.
 .P
 When autogrouping is enabled, all of the members of an autogroup
 are placed in the same kernel scheduler "task group".
+When disabled the group creation happens as above, and autogroup membership
+is still visible in /proc, but the autogroups are not used.
 The CFS scheduler employs an algorithm that equalizes the
 distribution of CPU cycles across task groups.
 The benefits of this for interactive desktop performance
-- 
2.47.0