Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754909Ab3ITNsN (ORCPT ); Fri, 20 Sep 2013 09:48:13 -0400 Received: from terminus.zytor.com ([198.137.202.10]:44314 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754634Ab3ITNsK (ORCPT ); Fri, 20 Sep 2013 09:48:10 -0400 Date: Fri, 20 Sep 2013 06:47:29 -0700 From: tip-bot for Jason Low Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, peterz@infradead.org, jason.low2@hp.com, tglx@linutronix.de Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, jason.low2@hp.com In-Reply-To: <1379096813-3032-3-git-send-email-jason.low2@hp.com> References: <1379096813-3032-3-git-send-email-jason.low2@hp.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/balancing: Consider max cost of idle balance per sched domain Git-Commit-ID: 9bd721c55c8a886b938a45198aab0ccb52f1f7fa 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 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (terminus.zytor.com [127.0.0.1]); Fri, 20 Sep 2013 06:47:36 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5786 Lines: 176 Commit-ID: 9bd721c55c8a886b938a45198aab0ccb52f1f7fa Gitweb: http://git.kernel.org/tip/9bd721c55c8a886b938a45198aab0ccb52f1f7fa Author: Jason Low AuthorDate: Fri, 13 Sep 2013 11:26:52 -0700 Committer: Ingo Molnar CommitDate: Fri, 20 Sep 2013 12:03:44 +0200 sched/balancing: Consider max cost of idle balance per sched domain In this patch, we keep track of the max cost we spend doing idle load balancing for each sched domain. If the avg time the CPU remains idle is less then the time we have already spent on idle balancing + the max cost of idle balancing in the sched domain, then we don't continue to attempt the balance. We also keep a per rq variable, max_idle_balance_cost, which keeps track of the max time spent on newidle load balances throughout all its domains so that we can determine the avg_idle's max value. By using the max, we avoid overrunning the average. This further reduces the chance we attempt balancing when the CPU is not idle for longer than the cost to balance. Signed-off-by: Jason Low Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1379096813-3032-3-git-send-email-jason.low2@hp.com Signed-off-by: Ingo Molnar --- arch/metag/include/asm/topology.h | 1 + include/linux/sched.h | 1 + include/linux/topology.h | 3 +++ kernel/sched/core.c | 3 ++- kernel/sched/fair.c | 16 ++++++++++++++++ kernel/sched/sched.h | 3 +++ 6 files changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/metag/include/asm/topology.h b/arch/metag/include/asm/topology.h index 23f5118..db19292 100644 --- a/arch/metag/include/asm/topology.h +++ b/arch/metag/include/asm/topology.h @@ -26,6 +26,7 @@ .last_balance = jiffies, \ .balance_interval = 1, \ .nr_balance_failed = 0, \ + .max_newidle_lb_cost = 0, \ } #define cpu_to_node(cpu) ((void)(cpu), 0) diff --git a/include/linux/sched.h b/include/linux/sched.h index 6682da3..be078ff 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -810,6 +810,7 @@ struct sched_domain { unsigned int nr_balance_failed; /* initialise to 0 */ u64 last_update; + u64 max_newidle_lb_cost; #ifdef CONFIG_SCHEDSTATS /* load_balance() stats */ diff --git a/include/linux/topology.h b/include/linux/topology.h index d3cf0d6..e2a2c3d 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -106,6 +106,7 @@ int arch_update_cpu_topology(void); .last_balance = jiffies, \ .balance_interval = 1, \ .smt_gain = 1178, /* 15% */ \ + .max_newidle_lb_cost = 0, \ } #endif #endif /* CONFIG_SCHED_SMT */ @@ -135,6 +136,7 @@ int arch_update_cpu_topology(void); , \ .last_balance = jiffies, \ .balance_interval = 1, \ + .max_newidle_lb_cost = 0, \ } #endif #endif /* CONFIG_SCHED_MC */ @@ -166,6 +168,7 @@ int arch_update_cpu_topology(void); , \ .last_balance = jiffies, \ .balance_interval = 1, \ + .max_newidle_lb_cost = 0, \ } #endif diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 048f39e..c2283c5 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1330,7 +1330,7 @@ ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags) if (rq->idle_stamp) { u64 delta = rq_clock(rq) - rq->idle_stamp; - u64 max = 2*sysctl_sched_migration_cost; + u64 max = 2*rq->max_idle_balance_cost; update_avg(&rq->avg_idle, delta); @@ -6506,6 +6506,7 @@ void __init sched_init(void) rq->online = 0; rq->idle_stamp = 0; rq->avg_idle = 2*sysctl_sched_migration_cost; + rq->max_idle_balance_cost = sysctl_sched_migration_cost; INIT_LIST_HEAD(&rq->cfs_tasks); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0784ab6..ffc99d8 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5396,6 +5396,7 @@ void idle_balance(int this_cpu, struct rq *this_rq) struct sched_domain *sd; int pulled_task = 0; unsigned long next_balance = jiffies + HZ; + u64 curr_cost = 0; this_rq->idle_stamp = rq_clock(this_rq); @@ -5412,15 +5413,27 @@ void idle_balance(int this_cpu, struct rq *this_rq) for_each_domain(this_cpu, sd) { unsigned long interval; int continue_balancing = 1; + u64 t0, domain_cost; if (!(sd->flags & SD_LOAD_BALANCE)) continue; + if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) + break; + if (sd->flags & SD_BALANCE_NEWIDLE) { + t0 = sched_clock_cpu(this_cpu); + /* If we've pulled tasks over stop searching: */ pulled_task = load_balance(this_cpu, this_rq, sd, CPU_NEWLY_IDLE, &continue_balancing); + + domain_cost = sched_clock_cpu(this_cpu) - t0; + if (domain_cost > sd->max_newidle_lb_cost) + sd->max_newidle_lb_cost = domain_cost; + + curr_cost += domain_cost; } interval = msecs_to_jiffies(sd->balance_interval); @@ -5442,6 +5455,9 @@ void idle_balance(int this_cpu, struct rq *this_rq) */ this_rq->next_balance = next_balance; } + + if (curr_cost > this_rq->max_idle_balance_cost) + this_rq->max_idle_balance_cost = curr_cost; } /* diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 0d7544c..e82484d 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -476,6 +476,9 @@ struct rq { u64 age_stamp; u64 idle_stamp; u64 avg_idle; + + /* This is used to determine avg_idle's max value */ + u64 max_idle_balance_cost; #endif #ifdef CONFIG_IRQ_TIME_ACCOUNTING -- 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/