From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933139AbcKOKjf (ORCPT ); Tue, 15 Nov 2016 05:39:35 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56124 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753423AbcKOKja (ORCPT ); Tue, 15 Nov 2016 05:39:30 -0500 From: Daniel Bristot de Oliveira To: Ingo Molnar , Peter Zijlstra Cc: Steven Rostedt , Clark Williams , "Luis Claudio R . Goncalves" , linux-kernel@vger.kernel.org Subject: [PATCH 2/2] sched/rt: Document RT_RUNTIME_SHARE sched feature Date: Tue, 15 Nov 2016 11:39:11 +0100 Message-Id: In-Reply-To: References: X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 15 Nov 2016 10:39:29 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a comment explaining the RT_RUNTIME_SHARE sched feature. Signed-off-by: Daniel Bristot de Oliveira Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Clark Williams Cc: Luis Claudio R. Goncalves Cc: linux-kernel@vger.kernel.org diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 5fffebfe..531c4bb 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -65,7 +65,17 @@ SCHED_FEAT(RT_PUSH_IPI, true) #endif SCHED_FEAT(FORCE_SD_OVERLAP, false) + +/* + * Enables the sharing of rt_runtime between CPUs, allowing a CPU to + * run a real-time task up to 100% of the time while leaving more + * space for non-real-time tasks to run on the CPU that lend rt_runtime. + * + * WARNING: This may allow the starvation of non-real-time tasks pinned + * to the CPU in which a spinning rt-task runs forever. + */ SCHED_FEAT(RT_RUNTIME_SHARE, false) + SCHED_FEAT(LB_MIN, false) SCHED_FEAT(ATTACH_AGE_LOAD, true) -- 2.7.4