linux-kernel - [PATCH] default to n for GROUP_SCHED and FAIR_GROUP

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Message-ID: <82e4877d0805031742o464dd581wd93173d79705ce0d@mail.gmail.com>
Date:	Sat, 3 May 2008 20:42:34 -0400
From:	"Parag Warudkar" <parag.warudkar@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"akpm@...l.org" <akpm@...l.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <peterz@...radead.org>
Subject: [PATCH] default to n for GROUP_SCHED and FAIR_GROUP_SCHED

GROUP_SCHED is confirmed to cause unacceptable latencies -
http://lkml.org/lkml/2008/5/2/370.

Besides there is no reason for it to be on by default.

Mark it EXPERIMENTAL and default to no.

Patch also attached.

Signed-off-by: Parag Warudkar <parag.warudkar@...il.com>

--- linux-2.6/init/Kconfig.orig	2008-05-03 20:14:41.000000000 -0400
+++ linux-2.6/init/Kconfig	2008-05-03 20:29:06.000000000 -0400
@@ -318,7 +318,8 @@

 config GROUP_SCHED
 	bool "Group CPU scheduler"
-	default y
+	depends on EXPERIMENTAL
+	default n
 	help
 	  This feature lets CPU scheduler recognize task groups and control CPU
 	  bandwidth allocation to such task groups.
@@ -326,7 +327,7 @@
 config FAIR_GROUP_SCHED
 	bool "Group scheduling for SCHED_OTHER"
 	depends on GROUP_SCHED
-	default y
+	default GROUP_SCHED

 config RT_GROUP_SCHED
 	bool "Group scheduling for SCHED_RR/FIFO"

View attachment "init_kconfig.patch" of type "text/x-diff" (845 bytes)