linux-kernel - sched: Add USER_SCHED to feature removal list

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Message-ID: <20091103214544.GI5495@linux.vnet.ibm.com>
Date:	Wed, 4 Nov 2009 03:15:44 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Balbir Singh <balbir@...ibm.com>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: sched: Add USER_SCHED to feature removal list


sched: Add USER_SCHED to feature removal list

Peter Zijlstra suggested that we remove USER_SCHED at
http://lkml.org/lkml/2009/3/21/67 . Removing USER_SCHED removes a
lot of code from the scheduler and simplifies the code.

We already have the ability to do user based classification which
is tightened using PAM in userspace.

Schedule USER_SCHED for removal in 2.6.34

Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
---
 Documentation/feature-removal-schedule.txt |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

Index: linux-2.6/Documentation/feature-removal-schedule.txt
===================================================================
--- linux-2.6.orig/Documentation/feature-removal-schedule.txt
+++ linux-2.6/Documentation/feature-removal-schedule.txt
@@ -6,6 +6,21 @@ be removed from this file.
 
 ---------------------------
 
+What:	USER_SCHED
+When:	2.6.34
+
+Why:	USER_SCHED was implemented as a proof of concept for group scheduling.
+	The effect of USER_SCHED can already be achieved from userspace with
+	the help of libcgroup. The removal of USER_SCHED will also simplify
+	the scheduler code with the removal of one major ifdef. There are also
+	issues USER_SCHED has with USER_NS. A decision was taken not to fix
+	those and instead remove USER_SCHED. Also new group scheduling
+	features will not be implemented for USER_SCHED.
+
+Who:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
+
+---------------------------
+
 What:	PRISM54
 When:	2.6.34
 
-- 
regards,
Dhaval
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