Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756062AbaKSPqt (ORCPT ); Wed, 19 Nov 2014 10:46:49 -0500 Received: from mail-pa0-f53.google.com ([209.85.220.53]:57520 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754480AbaKSPqs (ORCPT ); Wed, 19 Nov 2014 10:46:48 -0500 From: "pang.xunlei" To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Steven Rostedt , Juri Lelli , "pang.xunlei" Subject: [PATCH v2 1/4] sched/deadline: Modify cpudl.free_cpus to reflect rd->span Date: Wed, 19 Nov 2014 23:46:19 +0800 Message-Id: <1416411982-1204-1-git-send-email-pang.xunlei@linaro.org> X-Mailer: git-send-email 2.0.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, cpudl.free_cpus contains all cpus during init(see cpudl_init()), so when calling cpudl_find() we have to add rd->span cpumask(cpus_allowed is undependable when performing clustered scheduling using the cpuset) to avoid selecting the cpu outside current root domain, see find_later_rq(). This patch adds cpudl_set_freecpu() to initialize cpudl.free_cpus when doing rq_attach_root(), so we can avoid the extra rd->span operation when calling cpudl_find(). Signed-off-by: pang.xunlei --- kernel/sched/core.c | 2 ++ kernel/sched/cpudeadline.c | 18 ++++++++++++++---- kernel/sched/cpudeadline.h | 1 + kernel/sched/deadline.c | 3 --- 4 files changed, 17 insertions(+), 7 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 240157c..1b417de 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5584,6 +5584,8 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd) rq->rd = rd; cpumask_set_cpu(rq->cpu, rd->span); + cpudl_set_freecpu(&rd->cpudl, rq->cpu); + if (cpumask_test_cpu(rq->cpu, cpu_active_mask)) set_rq_online(rq); diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c index 539ca3c..c79f0d7 100644 --- a/kernel/sched/cpudeadline.c +++ b/kernel/sched/cpudeadline.c @@ -107,7 +107,9 @@ 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, later_mask, cp->free_cpus)) { + if (later_mask && + cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed) && + cpumask_and(later_mask, later_mask, cpu_active_mask)) { best_cpu = cpumask_any(later_mask); goto out; } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) && @@ -186,6 +188,16 @@ out: } /* + * cpudl_set_freecpu - Set the cpudl.free_cpus + * @cp: the cpudl max-heap context + * @cpu: rd attached cpu + */ +void cpudl_set_freecpu(struct cpudl *cp, int cpu) +{ + cpumask_set_cpu(cpu, cp->free_cpus); +} + +/* * cpudl_init - initialize the cpudl structure * @cp: the cpudl max-heap context */ @@ -203,7 +215,7 @@ int cpudl_init(struct cpudl *cp) if (!cp->elements) return -ENOMEM; - if (!alloc_cpumask_var(&cp->free_cpus, GFP_KERNEL)) { + if (!zalloc_cpumask_var(&cp->free_cpus, GFP_KERNEL)) { kfree(cp->elements); return -ENOMEM; } @@ -211,8 +223,6 @@ int cpudl_init(struct cpudl *cp) for_each_possible_cpu(i) cp->elements[i].idx = IDX_INVALID; - cpumask_setall(cp->free_cpus); - return 0; } diff --git a/kernel/sched/cpudeadline.h b/kernel/sched/cpudeadline.h index 020039b..4a10a65 100644 --- a/kernel/sched/cpudeadline.h +++ b/kernel/sched/cpudeadline.h @@ -24,6 +24,7 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p, struct cpumask *later_mask); void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid); int cpudl_init(struct cpudl *cp); +void cpudl_set_freecpu(struct cpudl *cp, int cpu); void cpudl_cleanup(struct cpudl *cp); #endif /* CONFIG_SMP */ diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 5285332..bd83272 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1187,9 +1187,6 @@ static int find_later_rq(struct task_struct *task) * 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) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/