From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753775AbaIXPHC (ORCPT ); Wed, 24 Sep 2014 11:07:02 -0400 Received: from terminus.zytor.com ([198.137.202.10]:59601 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751434AbaIXO4M (ORCPT ); Wed, 24 Sep 2014 10:56:12 -0400 Date: Wed, 24 Sep 2014 07:55:11 -0700 From: tip-bot for Juri Lelli Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, torvalds@linux-foundation.org, peterz@infradead.org, juri.lelli@arm.com, tglx@linutronix.de Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, juri.lelli@arm.com, peterz@infradead.org, tglx@linutronix.de In-Reply-To: <1411118561-26323-4-git-send-email-juri.lelli@arm.com> References: <1411118561-26323-4-git-send-email-juri.lelli@arm.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/deadline: Fix inter- exclusive cpusets migrations Git-Commit-ID: 91ec6778ec4f963fcb2c2793610919b572f633b0 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 91ec6778ec4f963fcb2c2793610919b572f633b0 Gitweb: http://git.kernel.org/tip/91ec6778ec4f963fcb2c2793610919b572f633b0 Author: Juri Lelli AuthorDate: Fri, 19 Sep 2014 10:22:41 +0100 Committer: Ingo Molnar CommitDate: Wed, 24 Sep 2014 14:46:57 +0200 sched/deadline: Fix inter- exclusive cpusets migrations Users can perform clustered scheduling using the cpuset facility. After an exclusive cpuset is created, task migrations happen only between CPUs belonging to the same cpuset. Inter- cpuset migrations can only happen when the user requires so, moving a task between different cpusets. This behaviour is broken in SCHED_DEADLINE, as currently spurious inter- cpuset migration may happen without user intervention. This patch fix the problem (and shuffles the code a bit to improve clarity). Signed-off-by: Juri Lelli Signed-off-by: Peter Zijlstra (Intel) Cc: raistlin@linux.it Cc: michael@amarulasolutions.com Cc: fchecconi@gmail.com Cc: daniel.wagner@bmw-carit.de Cc: vincent@legout.info Cc: luca.abeni@unitn.it Cc: Linus Torvalds Link: http://lkml.kernel.org/r/1411118561-26323-4-git-send-email-juri.lelli@arm.com Signed-off-by: Ingo Molnar --- kernel/sched/cpudeadline.c | 4 +--- kernel/sched/deadline.c | 7 +++++++ 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c index bd95963..539ca3c 100644 --- a/kernel/sched/cpudeadline.c +++ b/kernel/sched/cpudeadline.c @@ -107,9 +107,7 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p, int best_cpu = -1; const struct sched_dl_entity *dl_se = &p->dl; - if (later_mask && cpumask_and(later_mask, cp->free_cpus, - &p->cpus_allowed) && cpumask_and(later_mask, - later_mask, cpu_active_mask)) { + if (later_mask && cpumask_and(later_mask, later_mask, cp->free_cpus)) { best_cpu = cpumask_any(later_mask); goto out; } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) && diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index efb9412..abfaf3d 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1164,6 +1164,13 @@ static int find_later_rq(struct task_struct *task) if (task->nr_cpus_allowed == 1) return -1; + /* + * We have to consider system topology and task affinity + * first, then we can look for a suitable cpu. + */ + cpumask_copy(later_mask, task_rq(task)->rd->span); + cpumask_and(later_mask, later_mask, cpu_active_mask); + cpumask_and(later_mask, later_mask, &task->cpus_allowed); best_cpu = cpudl_find(&task_rq(task)->rd->cpudl, task, later_mask); if (best_cpu == -1)