From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755360AbZKCVqO (ORCPT ); Tue, 3 Nov 2009 16:46:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752892AbZKCVqN (ORCPT ); Tue, 3 Nov 2009 16:46:13 -0500 Received: from e23smtp02.au.ibm.com ([202.81.31.144]:58337 "EHLO e23smtp02.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752572AbZKCVqM (ORCPT ); Tue, 3 Nov 2009 16:46:12 -0500 Date: Wed, 4 Nov 2009 03:15:44 +0530 From: Dhaval Giani To: Peter Zijlstra , Balbir Singh , Bharata B Rao , Ingo Molnar , Thomas Gleixner , "Serge E. Hallyn" , Srivatsa Vaddagiri Cc: lkml Subject: sched: Add USER_SCHED to feature removal list Message-ID: <20091103214544.GI5495@linux.vnet.ibm.com> Reply-To: Dhaval Giani MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 + +--------------------------- + What: PRISM54 When: 2.6.34 -- regards, Dhaval