From: Tim Chen Date: Mon, 23 Jun 2014 19:16:49 +0000 (-0700) Subject: sched/fair: Implement fast idling of CPUs when the system is partially loaded X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4486edd12b5ac8a9af7a5e16e4b9eeb3b8339c10;p=openwrt%2Fstaging%2Fblogic.git sched/fair: Implement fast idling of CPUs when the system is partially loaded When a system is lightly loaded (i.e. no more than 1 job per cpu), attempt to pull job to a cpu before putting it to idle is unnecessary and can be skipped. This patch adds an indicator so the scheduler can know when there's no more than 1 active job is on any CPU in the system to skip needless job pulls. On a 4 socket machine with a request/response kind of workload from clients, we saw about 0.13 msec delay when we go through a full load balance to try pull job from all the other cpus. While 0.1 msec was spent on processing the request and generating a response, the 0.13 msec load balance overhead was actually more than the actual work being done. This overhead can be skipped much of the time for lightly loaded systems. With this patch, we tested with a netperf request/response workload that has the server busy with half the cpus in a 4 socket system. We found the patch eliminated 75% of the load balance attempts before idling a cpu. The overhead of setting/clearing the indicator is low as we already gather the necessary info while we call add_nr_running() and update_sd_lb_stats.() We switch to full load balance load immediately if any cpu got more than one job on its run queue in add_nr_running. We'll clear the indicator to avoid load balance when we detect no cpu's have more than one job when we scan the work queues in update_sg_lb_stats(). We are aggressive in turning on the load balance and opportunistic in skipping the load balance. Signed-off-by: Tim Chen Acked-by: Rik van Riel Acked-by: Jason Low Cc: "Paul E.McKenney" Cc: Andrew Morton Cc: Davidlohr Bueso Cc: Alex Shi Cc: Michel Lespinasse Cc: Peter Hurley Cc: Linus Torvalds Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1403551009.2970.613.camel@schen9-DESK Signed-off-by: Ingo Molnar --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index ef5eac773c70..e3ff3d1c4780 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5866,7 +5866,8 @@ static inline int sg_capacity_factor(struct lb_env *env, struct sched_group *gro */ static inline void update_sg_lb_stats(struct lb_env *env, struct sched_group *group, int load_idx, - int local_group, struct sg_lb_stats *sgs) + int local_group, struct sg_lb_stats *sgs, + bool *overload) { unsigned long load; int i; @@ -5884,6 +5885,10 @@ static inline void update_sg_lb_stats(struct lb_env *env, sgs->group_load += load; sgs->sum_nr_running += rq->nr_running; + + if (rq->nr_running > 1) + *overload = true; + #ifdef CONFIG_NUMA_BALANCING sgs->nr_numa_running += rq->nr_numa_running; sgs->nr_preferred_running += rq->nr_preferred_running; @@ -5994,6 +5999,7 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd struct sched_group *sg = env->sd->groups; struct sg_lb_stats tmp_sgs; int load_idx, prefer_sibling = 0; + bool overload = false; if (child && child->flags & SD_PREFER_SIBLING) prefer_sibling = 1; @@ -6014,7 +6020,8 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd update_group_capacity(env->sd, env->dst_cpu); } - update_sg_lb_stats(env, sg, load_idx, local_group, sgs); + update_sg_lb_stats(env, sg, load_idx, local_group, sgs, + &overload); if (local_group) goto next_group; @@ -6048,6 +6055,13 @@ next_group: if (env->sd->flags & SD_NUMA) env->fbq_type = fbq_classify_group(&sds->busiest_stat); + + if (!env->sd->parent) { + /* update overload indicator if we are at root domain */ + if (env->dst_rq->rd->overload != overload) + env->dst_rq->rd->overload = overload; + } + } /** @@ -6766,7 +6780,8 @@ static int idle_balance(struct rq *this_rq) */ this_rq->idle_stamp = rq_clock(this_rq); - if (this_rq->avg_idle < sysctl_sched_migration_cost) { + if (this_rq->avg_idle < sysctl_sched_migration_cost || + !this_rq->rd->overload) { rcu_read_lock(); sd = rcu_dereference_check_sched_domain(this_rq->sd); if (sd) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index eb8567610295..0191ed563bdd 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -477,6 +477,9 @@ struct root_domain { cpumask_var_t span; cpumask_var_t online; + /* Indicate more than one runnable task for any CPU */ + bool overload; + /* * The bit corresponding to a CPU gets set here if such CPU has more * than one runnable -deadline task (as it is below for RT tasks). @@ -1218,8 +1221,13 @@ static inline void add_nr_running(struct rq *rq, unsigned count) rq->nr_running = prev_nr + count; -#ifdef CONFIG_NO_HZ_FULL if (prev_nr < 2 && rq->nr_running >= 2) { +#ifdef CONFIG_SMP + if (!rq->rd->overload) + rq->rd->overload = true; +#endif + +#ifdef CONFIG_NO_HZ_FULL if (tick_nohz_full_cpu(rq->cpu)) { /* * Tick is needed if more than one task runs on a CPU. @@ -1231,8 +1239,8 @@ static inline void add_nr_running(struct rq *rq, unsigned count) */ tick_nohz_full_kick_cpu(rq->cpu); } - } #endif + } } static inline void sub_nr_running(struct rq *rq, unsigned count)