2 files changed, 2 insertions, 367 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index bd314d7cd9f8..24ca677b5457 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5929,8 +5929,6 @@ static const struct cpumask *cpu_cpu_mask(int cpu)
         return cpumask_of_node(cpu_to_node(cpu));
 }
 
-int sched_smt_power_savings = 0, sched_mc_power_savings = 0;
-
 struct sd_data {
         struct sched_domain **__percpu sd;
         struct sched_group **__percpu sg;
@@ -6322,7 +6320,6 @@ sd_numa_init(struct sched_domain_topology_level *tl, int cpu)
                                         | 0*SD_WAKE_AFFINE
                                         | 0*SD_PREFER_LOCAL
                                         | 0*SD_SHARE_CPUPOWER
-                                        | 0*SD_POWERSAVINGS_BALANCE
                                         | 0*SD_SHARE_PKG_RESOURCES
                                         | 1*SD_SERIALIZE
                                         | 0*SD_PREFER_SIBLING
@@ -6819,97 +6816,6 @@ match2:
         mutex_unlock(&sched_domains_mutex);
 }
 
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-static void reinit_sched_domains(void)
-{
-        get_online_cpus();
-
-        /* Destroy domains first to force the rebuild */
-        partition_sched_domains(0, NULL, NULL);
-
-        rebuild_sched_domains();
-        put_online_cpus();
-}
-
-static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
-{
-        unsigned int level = 0;
-
-        if (sscanf(buf, "%u", &level) != 1)
-                return -EINVAL;
-
-        /*
-         * level is always be positive so don't check for
-         * level < POWERSAVINGS_BALANCE_NONE which is 0
-         * What happens on 0 or 1 byte write,
-         * need to check for count as well?
-         */
-
-        if (level >= MAX_POWERSAVINGS_BALANCE_LEVELS)
-                return -EINVAL;
-
-        if (smt)
-                sched_smt_power_savings = level;
-        else
-                sched_mc_power_savings = level;
-
-        reinit_sched_domains();
-
-        return count;
-}
-
-#ifdef CONFIG_SCHED_MC
-static ssize_t sched_mc_power_savings_show(struct device *dev,
-                                           struct device_attribute *attr,
-                                           char *buf)
-{
-        return sprintf(buf, "%u\n", sched_mc_power_savings);
-}
-static ssize_t sched_mc_power_savings_store(struct device *dev,
-                                            struct device_attribute *attr,
-                                            const char *buf, size_t count)
-{
-        return sched_power_savings_store(buf, count, 0);
-}
-static DEVICE_ATTR(sched_mc_power_savings, 0644,
-                   sched_mc_power_savings_show,
-                   sched_mc_power_savings_store);
-#endif
-
-#ifdef CONFIG_SCHED_SMT
-static ssize_t sched_smt_power_savings_show(struct device *dev,
-                                            struct device_attribute *attr,
-                                            char *buf)
-{
-        return sprintf(buf, "%u\n", sched_smt_power_savings);
-}
-static ssize_t sched_smt_power_savings_store(struct device *dev,
-                                            struct device_attribute *attr,
-                                             const char *buf, size_t count)
-{
-        return sched_power_savings_store(buf, count, 1);
-}
-static DEVICE_ATTR(sched_smt_power_savings, 0644,
-                   sched_smt_power_savings_show,
-                   sched_smt_power_savings_store);
-#endif
-
-int __init sched_create_sysfs_power_savings_entries(struct device *dev)
-{
-        int err = 0;
-
-#ifdef CONFIG_SCHED_SMT
-        if (smt_capable())
-                err = device_create_file(dev, &dev_attr_sched_smt_power_savings);
-#endif
-#ifdef CONFIG_SCHED_MC
-        if (!err && mc_capable())
-                err = device_create_file(dev, &dev_attr_sched_mc_power_savings);
-#endif
-        return err;
-}
-#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
-
 /*
  * Update cpusets according to cpu_active mask.  If cpusets are
  * disabled, cpuset_update_active_cpus() becomes a simple wrapper
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0b42f4487329..940e6d17cf96 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2721,7 +2721,7 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
                  * If power savings logic is enabled for a domain, see if we
                  * are not overloaded, if so, don't balance wider.
                  */
-                if (tmp->flags & (SD_POWERSAVINGS_BALANCE|SD_PREFER_LOCAL)) {
+                if (tmp->flags & (SD_PREFER_LOCAL)) {
                         unsigned long power = 0;
                         unsigned long nr_running = 0;
                         unsigned long capacity;
@@ -2734,9 +2734,6 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
 
                         capacity = DIV_ROUND_CLOSEST(power, SCHED_POWER_SCALE);
 
-                        if (tmp->flags & SD_POWERSAVINGS_BALANCE)
-                                nr_running /= 2;
-
                         if (nr_running < capacity)
                                 want_sd = 0;
                 }
@@ -3435,14 +3432,6 @@ struct sd_lb_stats {
         unsigned int  busiest_group_weight;
 
         int group_imb; /* Is there imbalance in this sd */
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-        int power_savings_balance; /* Is powersave balance needed for this sd */
-        struct sched_group *group_min; /* Least loaded group in sd */
-        struct sched_group *group_leader; /* Group which relieves group_min */
-        unsigned long min_load_per_task; /* load_per_task in group_min */
-        unsigned long leader_nr_running; /* Nr running of group_leader */
-        unsigned long min_nr_running; /* Nr running of group_min */
-#endif
 };
 
 /*
@@ -3486,147 +3475,6 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
         return load_idx;
 }
 
-
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-/**
- * init_sd_power_savings_stats - Initialize power savings statistics for
- * the given sched_domain, during load balancing.
- *
- * @sd: Sched domain whose power-savings statistics are to be initialized.
- * @sds: Variable containing the statistics for sd.
- * @idle: Idle status of the CPU at which we're performing load-balancing.
- */
-static inline void init_sd_power_savings_stats(struct sched_domain *sd,
-        struct sd_lb_stats *sds, enum cpu_idle_type idle)
-{
-        /*
-         * Busy processors will not participate in power savings
-         * balance.
-         */
-        if (idle == CPU_NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
-                sds->power_savings_balance = 0;
-        else {
-                sds->power_savings_balance = 1;
-                sds->min_nr_running = ULONG_MAX;
-                sds->leader_nr_running = 0;
-        }
-}
-
-/**
- * update_sd_power_savings_stats - Update the power saving stats for a
- * sched_domain while performing load balancing.
- *
- * @group: sched_group belonging to the sched_domain under consideration.
- * @sds: Variable containing the statistics of the sched_domain
- * @local_group: Does group contain the CPU for which we're performing
- *              load balancing ?
- * @sgs: Variable containing the statistics of the group.
- */
-static inline void update_sd_power_savings_stats(struct sched_group *group,
-        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
-{
-
-        if (!sds->power_savings_balance)
-                return;
-
-        /*
-         * If the local group is idle or completely loaded
-         * no need to do power savings balance at this domain
-         */
-        if (local_group && (sds->this_nr_running >= sgs->group_capacity ||
-                                !sds->this_nr_running))
-                sds->power_savings_balance = 0;
-
-        /*
-         * If a group is already running at full capacity or idle,
-         * don't include that group in power savings calculations
-         */
-        if (!sds->power_savings_balance ||
-                sgs->sum_nr_running >= sgs->group_capacity ||
-                !sgs->sum_nr_running)
-                return;
-
-        /*
-         * Calculate the group which has the least non-idle load.
-         * This is the group from where we need to pick up the load
-         * for saving power
-         */
-        if ((sgs->sum_nr_running < sds->min_nr_running) ||
-            (sgs->sum_nr_running == sds->min_nr_running &&
-             group_first_cpu(group) > group_first_cpu(sds->group_min))) {
-                sds->group_min = group;
-                sds->min_nr_running = sgs->sum_nr_running;
-                sds->min_load_per_task = sgs->sum_weighted_load /
-                                                sgs->sum_nr_running;
-        }
-
-        /*
-         * Calculate the group which is almost near its
-         * capacity but still has some space to pick up some load
-         * from other group and save more power
-         */
-        if (sgs->sum_nr_running + 1 > sgs->group_capacity)
-                return;
-
-        if (sgs->sum_nr_running > sds->leader_nr_running ||
-            (sgs->sum_nr_running == sds->leader_nr_running &&
-             group_first_cpu(group) < group_first_cpu(sds->group_leader))) {
-                sds->group_leader = group;
-                sds->leader_nr_running = sgs->sum_nr_running;
-        }
-}
-
-/**
- * check_power_save_busiest_group - see if there is potential for some power-savings balance
- * @env: load balance environment
- * @sds: Variable containing the statistics of the sched_domain
- *      under consideration.
- *
- * Description:
- * Check if we have potential to perform some power-savings balance.
- * If yes, set the busiest group to be the least loaded group in the
- * sched_domain, so that it's CPUs can be put to idle.
- *
- * Returns 1 if there is potential to perform power-savings balance.
- * Else returns 0.
- */
-static inline
-int check_power_save_busiest_group(struct lb_env *env, struct sd_lb_stats *sds)
-{
-        if (!sds->power_savings_balance)
-                return 0;
-
-        if (sds->this != sds->group_leader ||
-                        sds->group_leader == sds->group_min)
-                return 0;
-
-        env->imbalance = sds->min_load_per_task;
-        sds->busiest = sds->group_min;
-
-        return 1;
-
-}
-#else /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
-static inline void init_sd_power_savings_stats(struct sched_domain *sd,
-        struct sd_lb_stats *sds, enum cpu_idle_type idle)
-{
-        return;
-}
-
-static inline void update_sd_power_savings_stats(struct sched_group *group,
-        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
-{
-        return;
-}
-
-static inline
-int check_power_save_busiest_group(struct lb_env *env, struct sd_lb_stats *sds)
-{
-        return 0;
-}
-#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
-
-
 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)
 {
         return SCHED_POWER_SCALE;
@@ -3932,7 +3780,6 @@ static inline void update_sd_lb_stats(struct lb_env *env,
         if (child && child->flags & SD_PREFER_SIBLING)
                 prefer_sibling = 1;
 
-        init_sd_power_savings_stats(env->sd, sds, env->idle);
         load_idx = get_sd_load_idx(env->sd, env->idle);
 
         do {
@@ -3981,7 +3828,6 @@ static inline void update_sd_lb_stats(struct lb_env *env,
                         sds->group_imb = sgs.group_imb;
                 }
 
-                update_sd_power_savings_stats(sg, sds, local_group, &sgs);
                 sg = sg->next;
         } while (sg != env->sd->groups);
 }
@@ -4276,12 +4122,6 @@ force_balance:
         return sds.busiest;
 
 out_balanced:
-        /*
-         * There is no obvious imbalance. But check if we can do some balancing
-         * to save power.
-         */
-        if (check_power_save_busiest_group(env, &sds))
-                return sds.busiest;
 ret:
         env->imbalance = 0;
         return NULL;
@@ -4359,28 +4199,6 @@ static int need_active_balance(struct lb_env *env)
                  */
                 if ((sd->flags & SD_ASYM_PACKING) && env->src_cpu > env->dst_cpu)
                         return 1;
-
-                /*
-                 * The only task running in a non-idle cpu can be moved to this
-                 * cpu in an attempt to completely freeup the other CPU
-                 * package.
-                 *
-                 * The package power saving logic comes from
-                 * find_busiest_group(). If there are no imbalance, then
-                 * f_b_g() will return NULL. However when sched_mc={1,2} then
-                 * f_b_g() will select a group from which a running task may be
-                 * pulled to this cpu in order to make the other package idle.
-                 * If there is no opportunity to make a package idle and if
-                 * there are no imbalance, then f_b_g() will return NULL and no
-                 * action will be taken in load_balance_newidle().
-                 *
-                 * Under normal task pull operation due to imbalance, there
-                 * will be more than one task in the source run queue and
-                 * move_tasks() will succeed.  ld_moved will be true and this
-                 * active balance code will not be triggered.
-                 */
-                if (sched_mc_power_savings < POWERSAVINGS_BALANCE_WAKEUP)
-                        return 0;
         }
 
         return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2);
@@ -4700,104 +4518,15 @@ static struct {
         unsigned long next_balance;     /* in jiffy units */
 } nohz ____cacheline_aligned;
 
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-/**
- * lowest_flag_domain - Return lowest sched_domain containing flag.
- * @cpu:        The cpu whose lowest level of sched domain is to
- *              be returned.
- * @flag:       The flag to check for the lowest sched_domain
- *              for the given cpu.
- *
- * Returns the lowest sched_domain of a cpu which contains the given flag.
- */
-static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
-{
-        struct sched_domain *sd;
-
-        for_each_domain(cpu, sd)
-                if (sd->flags & flag)
-                        break;
-
-        return sd;
-}
-
-/**
- * for_each_flag_domain - Iterates over sched_domains containing the flag.
- * @cpu:        The cpu whose domains we're iterating over.
- * @sd:         variable holding the value of the power_savings_sd
- *              for cpu.
- * @flag:       The flag to filter the sched_domains to be iterated.
- *
- * Iterates over all the scheduler domains for a given cpu that has the 'flag'
- * set, starting from the lowest sched_domain to the highest.
- */
-#define for_each_flag_domain(cpu, sd, flag) \
-        for (sd = lowest_flag_domain(cpu, flag); \
-                (sd && (sd->flags & flag)); sd = sd->parent)
-
-/**
- * find_new_ilb - Finds the optimum idle load balancer for nomination.
- * @cpu:        The cpu which is nominating a new idle_load_balancer.
- *
- * Returns:     Returns the id of the idle load balancer if it exists,
- *              Else, returns >= nr_cpu_ids.
- *
- * This algorithm picks the idle load balancer such that it belongs to a
- * semi-idle powersavings sched_domain. The idea is to try and avoid
- * completely idle packages/cores just for the purpose of idle load balancing
- * when there are other idle cpu's which are better suited for that job.
- */
-static int find_new_ilb(int cpu)
+static inline int find_new_ilb(int call_cpu)
 {
         int ilb = cpumask_first(nohz.idle_cpus_mask);
-        struct sched_group *ilbg;
-        struct sched_domain *sd;
 
-        /*
-         * Have idle load balancer selection from semi-idle packages only
-         * when power-aware load balancing is enabled
-         */
-        if (!(sched_smt_power_savings || sched_mc_power_savings))
-                goto out_done;
-
-        /*
-         * Optimize for the case when we have no idle CPUs or only one
-         * idle CPU. Don't walk the sched_domain hierarchy in such cases
-         */
-        if (cpumask_weight(nohz.idle_cpus_mask) < 2)
-                goto out_done;
-
-        rcu_read_lock();
-        for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
-                ilbg = sd->groups;
-
-                do {
-                        if (ilbg->group_weight !=
-                                atomic_read(&ilbg->sgp->nr_busy_cpus)) {
-                                ilb = cpumask_first_and(nohz.idle_cpus_mask,
-                                                        sched_group_cpus(ilbg));
-                                goto unlock;
-                        }
-
-                        ilbg = ilbg->next;
-
-                } while (ilbg != sd->groups);
-        }
-unlock:
-        rcu_read_unlock();
-
-out_done:
         if (ilb < nr_cpu_ids && idle_cpu(ilb))
                 return ilb;
 
         return nr_cpu_ids;
 }
-#else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
-static inline int find_new_ilb(int call_cpu)
-{
-        return nr_cpu_ids;
-}
-#endif
 
 /*
  * Kick a CPU to do the nohz balancing, if it is time for it. We pick the