10 files changed, 84 insertions, 237 deletions

diff --git a/arch/ia64/include/asm/topology.h b/arch/ia64/include/asm/topology.h
index 7b4c8c70b2d1..cf6053b226c3 100644
--- a/arch/ia64/include/asm/topology.h
+++ b/arch/ia64/include/asm/topology.h
@@ -67,6 +67,7 @@ void build_cpu_to_node_map(void);
         .flags                  = SD_LOAD_BALANCE       \
                                 | SD_BALANCE_NEWIDLE    \
                                 | SD_BALANCE_EXEC       \
+                                | SD_BALANCE_WAKE       \
                                 | SD_WAKE_AFFINE,       \
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
@@ -91,8 +92,8 @@ void build_cpu_to_node_map(void);
         .flags                  = SD_LOAD_BALANCE       \
                                 | SD_BALANCE_EXEC       \
                                 | SD_BALANCE_FORK       \
-                                | SD_SERIALIZE          \
-                                | SD_WAKE_BALANCE,      \
+                                | SD_BALANCE_WAKE       \
+                                | SD_SERIALIZE,         \
         .last_balance           = jiffies,              \
         .balance_interval       = 64,                   \
         .nr_balance_failed      = 0,                    \
diff --git a/arch/mips/include/asm/mach-ip27/topology.h b/arch/mips/include/asm/mach-ip27/topology.h
index 07547231e078..d8332398f5be 100644
--- a/arch/mips/include/asm/mach-ip27/topology.h
+++ b/arch/mips/include/asm/mach-ip27/topology.h
@@ -48,7 +48,7 @@ extern unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
         .cache_nice_tries       = 1,                    \
         .flags                  = SD_LOAD_BALANCE       \
                                 | SD_BALANCE_EXEC       \
-                                | SD_WAKE_BALANCE,      \
+                                | SD_BALANCE_WAKE,      \
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
         .nr_balance_failed      = 0,                    \
diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 054a16d68082..c6343313ff59 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -62,9 +62,8 @@ static inline int pcibus_to_node(struct pci_bus *bus)
         .flags                  = SD_LOAD_BALANCE       \
                                 | SD_BALANCE_EXEC       \
                                 | SD_BALANCE_NEWIDLE    \
-                                | SD_WAKE_IDLE          \
-                                | SD_SERIALIZE          \
-                                | SD_WAKE_BALANCE,      \
+                                | SD_BALANCE_WAKE       \
+                                | SD_SERIALIZE,         \
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
         .nr_balance_failed      = 0,                    \
diff --git a/arch/sh/include/asm/topology.h b/arch/sh/include/asm/topology.h
index b69ee850906d..dc1531e2f25f 100644
--- a/arch/sh/include/asm/topology.h
+++ b/arch/sh/include/asm/topology.h
@@ -21,8 +21,8 @@
         .flags                  = SD_LOAD_BALANCE       \
                                 | SD_BALANCE_FORK       \
                                 | SD_BALANCE_EXEC       \
-                                | SD_SERIALIZE          \
-                                | SD_WAKE_BALANCE,      \
+                                | SD_BALANCE_WAKE       \
+                                | SD_SERIALIZE,         \
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
         .nr_balance_failed      = 0,                    \
diff --git a/arch/sparc/include/asm/topology_64.h b/arch/sparc/include/asm/topology_64.h
index e5ea8d332421..1d091abd2d13 100644
--- a/arch/sparc/include/asm/topology_64.h
+++ b/arch/sparc/include/asm/topology_64.h
@@ -57,8 +57,8 @@ static inline int pcibus_to_node(struct pci_bus *pbus)
         .flags                  = SD_LOAD_BALANCE       \
                                 | SD_BALANCE_FORK       \
                                 | SD_BALANCE_EXEC       \
-                                | SD_SERIALIZE          \
-                                | SD_WAKE_BALANCE,      \
+                                | SD_BALANCE_WAKE       \
+                                | SD_SERIALIZE,         \
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
 }
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 26d06e052a18..966d58dc6274 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -145,14 +145,12 @@ extern unsigned long node_remap_size[];
                                 | 1*SD_BALANCE_NEWIDLE                  \
                                 | 1*SD_BALANCE_EXEC                     \
                                 | 1*SD_BALANCE_FORK                     \
-                                | 0*SD_WAKE_IDLE                        \
+                                | 1*SD_BALANCE_WAKE                     \
                                 | 1*SD_WAKE_AFFINE                      \
-                                | 1*SD_WAKE_BALANCE                     \
                                 | 0*SD_SHARE_CPUPOWER                   \
                                 | 0*SD_POWERSAVINGS_BALANCE             \
                                 | 0*SD_SHARE_PKG_RESOURCES              \
                                 | 1*SD_SERIALIZE                        \
-                                | 1*SD_WAKE_IDLE_FAR                    \
                                 | 0*SD_PREFER_SIBLING                   \
                                 ,                                       \
         .last_balance           = jiffies,                              \
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3b0ca66bd6ce..c30bf3d516d1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -803,16 +803,15 @@ enum cpu_idle_type {
 #define SD_BALANCE_NEWIDLE      0x0002  /* Balance when about to become idle */
 #define SD_BALANCE_EXEC         0x0004  /* Balance on exec */
 #define SD_BALANCE_FORK         0x0008  /* Balance on fork, clone */
-#define SD_WAKE_IDLE            0x0010  /* Wake to idle CPU on task wakeup */
+#define SD_BALANCE_WAKE         0x0010  /* Balance on wakeup */
 #define SD_WAKE_AFFINE          0x0020  /* Wake task to waking CPU */
-#define SD_WAKE_BALANCE         0x0040  /* Perform balancing at task wakeup */
+
 #define SD_SHARE_CPUPOWER       0x0080  /* Domain members share cpu power */
 #define SD_POWERSAVINGS_BALANCE 0x0100  /* Balance for power savings */
 #define SD_SHARE_PKG_RESOURCES  0x0200  /* Domain members share cpu pkg resources */
 #define SD_SERIALIZE            0x0400  /* Only a single load balancing instance */
-#define SD_WAKE_IDLE_FAR        0x0800  /* Gain latency sacrificing cache hit */
+
 #define SD_PREFER_SIBLING       0x1000  /* Prefer to place tasks in a sibling domain */
-#define SD_BALANCE_WAKE         0x2000  /* Balance on wakeup */
 
 enum powersavings_balance_level {
         POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 85e8cf7d393c..6a8cd15555bb 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -95,14 +95,12 @@ int arch_update_cpu_topology(void);
                                 | 1*SD_BALANCE_NEWIDLE                  \
                                 | 1*SD_BALANCE_EXEC                     \
                                 | 1*SD_BALANCE_FORK                     \
-                                | 0*SD_WAKE_IDLE                        \
+                                | 1*SD_BALANCE_WAKE                     \
                                 | 1*SD_WAKE_AFFINE                      \
-                                | 1*SD_WAKE_BALANCE                     \
                                 | 1*SD_SHARE_CPUPOWER                   \
                                 | 0*SD_POWERSAVINGS_BALANCE             \
                                 | 0*SD_SHARE_PKG_RESOURCES              \
                                 | 0*SD_SERIALIZE                        \
-                                | 0*SD_WAKE_IDLE_FAR                    \
                                 | 0*SD_PREFER_SIBLING                   \
                                 ,                                       \
         .last_balance           = jiffies,                              \
@@ -129,13 +127,11 @@ int arch_update_cpu_topology(void);
                                 | 1*SD_BALANCE_NEWIDLE                  \
                                 | 1*SD_BALANCE_EXEC                     \
                                 | 1*SD_BALANCE_FORK                     \
-                                | 1*SD_WAKE_IDLE                        \
+                                | 1*SD_BALANCE_WAKE                     \
                                 | 1*SD_WAKE_AFFINE                      \
-                                | 1*SD_WAKE_BALANCE                     \
                                 | 0*SD_SHARE_CPUPOWER                   \
                                 | 1*SD_SHARE_PKG_RESOURCES              \
                                 | 0*SD_SERIALIZE                        \
-                                | 0*SD_WAKE_IDLE_FAR                    \
                                 | sd_balance_for_mc_power()             \
                                 | sd_power_saving_flags()               \
                                 ,                                       \
@@ -163,13 +159,11 @@ int arch_update_cpu_topology(void);
                                 | 1*SD_BALANCE_NEWIDLE                  \
                                 | 1*SD_BALANCE_EXEC                     \
                                 | 1*SD_BALANCE_FORK                     \
-                                | 1*SD_WAKE_IDLE                        \
+                                | 1*SD_BALANCE_WAKE                     \
                                 | 0*SD_WAKE_AFFINE                      \
-                                | 1*SD_WAKE_BALANCE                     \
                                 | 0*SD_SHARE_CPUPOWER                   \
                                 | 0*SD_SHARE_PKG_RESOURCES              \
                                 | 0*SD_SERIALIZE                        \
-                                | 0*SD_WAKE_IDLE_FAR                    \
                                 | sd_balance_for_package_power()        \
                                 | sd_power_saving_flags()               \
                                 ,                                       \
@@ -191,14 +185,12 @@ int arch_update_cpu_topology(void);
                                 | 1*SD_BALANCE_NEWIDLE                  \
                                 | 0*SD_BALANCE_EXEC                     \
                                 | 0*SD_BALANCE_FORK                     \
-                                | 0*SD_WAKE_IDLE                        \
+                                | 0*SD_BALANCE_WAKE                     \
                                 | 1*SD_WAKE_AFFINE                      \
-                                | 0*SD_WAKE_BALANCE                     \
                                 | 0*SD_SHARE_CPUPOWER                   \
                                 | 0*SD_POWERSAVINGS_BALANCE             \
                                 | 0*SD_SHARE_PKG_RESOURCES              \
                                 | 1*SD_SERIALIZE                        \
-                                | 1*SD_WAKE_IDLE_FAR                    \
                                 | 0*SD_PREFER_SIBLING                   \
                                 ,                                       \
         .last_balance           = jiffies,                              \
diff --git a/kernel/sched.c b/kernel/sched.c
index fc6fda881d2e..6c819f338b11 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -512,14 +512,6 @@ struct root_domain {
 #ifdef CONFIG_SMP
         struct cpupri cpupri;
 #endif
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-        /*
-         * Preferred wake up cpu nominated by sched_mc balance that will be
-         * used when most cpus are idle in the system indicating overall very
-         * low system utilisation. Triggered at POWERSAVINGS_BALANCE_WAKEUP(2)
-         */
-        unsigned int sched_mc_preferred_wakeup_cpu;
-#endif
 };
 
 /*
@@ -2315,22 +2307,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
         if (!sched_feat(SYNC_WAKEUPS))
                 sync = 0;
 
-#ifdef CONFIG_SMP
-        if (sched_feat(LB_WAKEUP_UPDATE) && !root_task_group_empty()) {
-                struct sched_domain *sd;
-
-                this_cpu = raw_smp_processor_id();
-                cpu = task_cpu(p);
-
-                for_each_domain(this_cpu, sd) {
-                        if (cpumask_test_cpu(cpu, sched_domain_span(sd))) {
-                                update_shares(sd);
-                                break;
-                        }
-                }
-        }
-#endif
-
         this_cpu = get_cpu();
 
         smp_wmb();
@@ -3533,11 +3509,6 @@ static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
         *imbalance = sds->min_load_per_task;
         sds->busiest = sds->group_min;
 
-        if (sched_mc_power_savings >= POWERSAVINGS_BALANCE_WAKEUP) {
-                cpu_rq(this_cpu)->rd->sched_mc_preferred_wakeup_cpu =
-                        group_first_cpu(sds->group_leader);
-        }
-
         return 1;
 
 }
@@ -7850,9 +7821,7 @@ static int sd_degenerate(struct sched_domain *sd)
         }
 
         /* Following flags don't use groups */
-        if (sd->flags & (SD_WAKE_IDLE |
-                         SD_WAKE_AFFINE |
-                         SD_WAKE_BALANCE))
+        if (sd->flags & (SD_WAKE_AFFINE))
                 return 0;
 
         return 1;
@@ -7869,10 +7838,6 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
         if (!cpumask_equal(sched_domain_span(sd), sched_domain_span(parent)))
                 return 0;
 
-        /* Does parent contain flags not in child? */
-        /* WAKE_BALANCE is a subset of WAKE_AFFINE */
-        if (cflags & SD_WAKE_AFFINE)
-                pflags &= ~SD_WAKE_BALANCE;
         /* Flags needing groups don't count if only 1 group in parent */
         if (parent->groups == parent->groups->next) {
                 pflags &= ~(SD_LOAD_BALANCE |
@@ -8558,10 +8523,10 @@ static void set_domain_attribute(struct sched_domain *sd,
                 request = attr->relax_domain_level;
         if (request < sd->level) {
                 /* turn off idle balance on this domain */
-                sd->flags &= ~(SD_WAKE_IDLE|SD_BALANCE_NEWIDLE);
+                sd->flags &= ~(SD_BALANCE_WAKE|SD_BALANCE_NEWIDLE);
         } else {
                 /* turn on idle balance on this domain */
-                sd->flags |= (SD_WAKE_IDLE_FAR|SD_BALANCE_NEWIDLE);
+                sd->flags |= (SD_BALANCE_WAKE|SD_BALANCE_NEWIDLE);
         }
 }
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index f2eb5b934715..09d19f77eb3a 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1062,83 +1062,6 @@ static void yield_task_fair(struct rq *rq)
         se->vruntime = rightmost->vruntime + 1;
 }
 
-/*
- * wake_idle() will wake a task on an idle cpu if task->cpu is
- * not idle and an idle cpu is available.  The span of cpus to
- * search starts with cpus closest then further out as needed,
- * so we always favor a closer, idle cpu.
- * Domains may include CPUs that are not usable for migration,
- * hence we need to mask them out (rq->rd->online)
- *
- * Returns the CPU we should wake onto.
- */
-#if defined(ARCH_HAS_SCHED_WAKE_IDLE)
-
-#define cpu_rd_active(cpu, rq) cpumask_test_cpu(cpu, rq->rd->online)
-
-static int wake_idle(int cpu, struct task_struct *p)
-{
-        struct sched_domain *sd;
-        int i;
-        unsigned int chosen_wakeup_cpu;
-        int this_cpu;
-        struct rq *task_rq = task_rq(p);
-
-        /*
-         * At POWERSAVINGS_BALANCE_WAKEUP level, if both this_cpu and prev_cpu
-         * are idle and this is not a kernel thread and this task's affinity
-         * allows it to be moved to preferred cpu, then just move!
-         */
-
-        this_cpu = smp_processor_id();
-        chosen_wakeup_cpu =
-                cpu_rq(this_cpu)->rd->sched_mc_preferred_wakeup_cpu;
-
-        if (sched_mc_power_savings >= POWERSAVINGS_BALANCE_WAKEUP &&
-                idle_cpu(cpu) && idle_cpu(this_cpu) &&
-                p->mm && !(p->flags & PF_KTHREAD) &&
-                cpu_isset(chosen_wakeup_cpu, p->cpus_allowed))
-                return chosen_wakeup_cpu;
-
-        /*
-         * If it is idle, then it is the best cpu to run this task.
-         *
-         * This cpu is also the best, if it has more than one task already.
-         * Siblings must be also busy(in most cases) as they didn't already
-         * pickup the extra load from this cpu and hence we need not check
-         * sibling runqueue info. This will avoid the checks and cache miss
-         * penalities associated with that.
-         */
-        if (idle_cpu(cpu) || cpu_rq(cpu)->cfs.nr_running > 1)
-                return cpu;
-
-        for_each_domain(cpu, sd) {
-                if ((sd->flags & SD_WAKE_IDLE)
-                    || ((sd->flags & SD_WAKE_IDLE_FAR)
-                        && !task_hot(p, task_rq->clock, sd))) {
-                        for_each_cpu_and(i, sched_domain_span(sd),
-                                         &p->cpus_allowed) {
-                                if (cpu_rd_active(i, task_rq) && idle_cpu(i)) {
-                                        if (i != task_cpu(p)) {
-                                                schedstat_inc(p,
-                                                       se.nr_wakeups_idle);
-                                        }
-                                        return i;
-                                }
-                        }
-                } else {
-                        break;
-                }
-        }
-        return cpu;
-}
-#else /* !ARCH_HAS_SCHED_WAKE_IDLE*/
-static inline int wake_idle(int cpu, struct task_struct *p)
-{
-        return cpu;
-}
-#endif
-
 #ifdef CONFIG_SMP
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1225,21 +1148,22 @@ static inline unsigned long effective_load(struct task_group *tg, int cpu,
 
 #endif
 
-static int
-wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
-            struct task_struct *p, int prev_cpu, int this_cpu, int sync,
-            int idx, unsigned long load, unsigned long this_load,
-            unsigned int imbalance)
+static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
 {
-        struct task_struct *curr = this_rq->curr;
-        struct task_group *tg;
-        unsigned long tl = this_load;
+        struct task_struct *curr = current;
+        unsigned long this_load, load;
+        int idx, this_cpu, prev_cpu;
         unsigned long tl_per_task;
+        unsigned int imbalance;
+        struct task_group *tg;
         unsigned long weight;
         int balanced;
 
-        if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
-                return 0;
+        idx       = sd->wake_idx;
+        this_cpu  = smp_processor_id();
+        prev_cpu  = task_cpu(p);
+        load      = source_load(prev_cpu, idx);
+        this_load = target_load(this_cpu, idx);
 
         if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||
                         p->se.avg_overlap > sysctl_sched_migration_cost))
@@ -1254,24 +1178,26 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
                 tg = task_group(current);
                 weight = current->se.load.weight;
 
-                tl += effective_load(tg, this_cpu, -weight, -weight);
+                this_load += effective_load(tg, this_cpu, -weight, -weight);
                 load += effective_load(tg, prev_cpu, 0, -weight);
         }
 
         tg = task_group(p);
         weight = p->se.load.weight;
 
+        imbalance = 100 + (sd->imbalance_pct - 100) / 2;
+
         /*
          * In low-load situations, where prev_cpu is idle and this_cpu is idle
-         * due to the sync cause above having dropped tl to 0, we'll always have
-         * an imbalance, but there's really nothing you can do about that, so
-         * that's good too.
+         * due to the sync cause above having dropped this_load to 0, we'll
+         * always have an imbalance, but there's really nothing you can do
+         * about that, so that's good too.
          *
          * Otherwise check if either cpus are near enough in load to allow this
          * task to be woken on this_cpu.
          */
-        balanced = !tl ||
-                100*(tl + effective_load(tg, this_cpu, weight, weight)) <=
+        balanced = !this_load ||
+                100*(this_load + effective_load(tg, this_cpu, weight, weight)) <=
                 imbalance*(load + effective_load(tg, prev_cpu, 0, weight));
 
         /*
@@ -1285,14 +1211,15 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
         schedstat_inc(p, se.nr_wakeups_affine_attempts);
         tl_per_task = cpu_avg_load_per_task(this_cpu);
 
-        if (balanced || (tl <= load && tl + target_load(prev_cpu, idx) <=
-                        tl_per_task)) {
+        if (balanced ||
+            (this_load <= load &&
+             this_load + target_load(prev_cpu, idx) <= tl_per_task)) {
                 /*
                  * This domain has SD_WAKE_AFFINE and
                  * p is cache cold in this domain, and
                  * there is no bad imbalance.
                  */
-                schedstat_inc(this_sd, ttwu_move_affine);
+                schedstat_inc(sd, ttwu_move_affine);
                 schedstat_inc(p, se.nr_wakeups_affine);
 
                 return 1;
@@ -1300,72 +1227,6 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
         return 0;
 }
 
-static int sched_balance_self(int cpu, int flag);
-
-static int select_task_rq_fair(struct task_struct *p, int flag, int sync)
-{
-        struct sched_domain *sd, *this_sd = NULL;
-        int prev_cpu, this_cpu, new_cpu;
-        unsigned long load, this_load;
-        struct rq *this_rq;
-        unsigned int imbalance;
-        int idx;
-
-        prev_cpu        = task_cpu(p);
-        this_cpu        = smp_processor_id();
-        this_rq         = cpu_rq(this_cpu);
-        new_cpu         = prev_cpu;
-
-        if (flag != SD_BALANCE_WAKE)
-                return sched_balance_self(this_cpu, flag);
-
-        /*
-         * 'this_sd' is the first domain that both
-         * this_cpu and prev_cpu are present in:
-         */
-        for_each_domain(this_cpu, sd) {
-                if (cpumask_test_cpu(prev_cpu, sched_domain_span(sd))) {
-                        this_sd = sd;
-                        break;
-                }
-        }
-
-        if (unlikely(!cpumask_test_cpu(this_cpu, &p->cpus_allowed)))
-                goto out;
-
-        /*
-         * Check for affine wakeup and passive balancing possibilities.
-         */
-        if (!this_sd)
-                goto out;
-
-        idx = this_sd->wake_idx;
-
-        imbalance = 100 + (this_sd->imbalance_pct - 100) / 2;
-
-        load = source_load(prev_cpu, idx);
-        this_load = target_load(this_cpu, idx);
-
-        if (wake_affine(this_sd, this_rq, p, prev_cpu, this_cpu, sync, idx,
-                                     load, this_load, imbalance))
-                return this_cpu;
-
-        /*
-         * Start passive balancing when half the imbalance_pct
-         * limit is reached.
-         */
-        if (this_sd->flags & SD_WAKE_BALANCE) {
-                if (imbalance*this_load <= 100*load) {
-                        schedstat_inc(this_sd, ttwu_move_balance);
-                        schedstat_inc(p, se.nr_wakeups_passive);
-                        return this_cpu;
-                }
-        }
-
-out:
-        return wake_idle(new_cpu, p);
-}
-
 /*
  * find_idlest_group finds and returns the least busy CPU group within the
  * domain.
@@ -1455,10 +1316,20 @@ find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
  *
  * preempt must be disabled.
  */
-static int sched_balance_self(int cpu, int flag)
+static int select_task_rq_fair(struct task_struct *p, int flag, int sync)
 {
         struct task_struct *t = current;
         struct sched_domain *tmp, *sd = NULL;
+        int cpu = smp_processor_id();
+        int prev_cpu = task_cpu(p);
+        int new_cpu = cpu;
+        int want_affine = 0;
+
+        if (flag & SD_BALANCE_WAKE) {
+                if (sched_feat(AFFINE_WAKEUPS))
+                        want_affine = 1;
+                new_cpu = prev_cpu;
+        }
 
         for_each_domain(cpu, tmp) {
                 /*
@@ -1466,16 +1337,38 @@ static int sched_balance_self(int cpu, int flag)
                  */
                 if (tmp->flags & SD_POWERSAVINGS_BALANCE)
                         break;
-                if (tmp->flags & flag)
-                        sd = tmp;
-        }
 
-        if (sd)
-                update_shares(sd);
+                switch (flag) {
+                case SD_BALANCE_WAKE:
+                        if (!sched_feat(LB_WAKEUP_UPDATE))
+                                break;
+                case SD_BALANCE_FORK:
+                case SD_BALANCE_EXEC:
+                        if (root_task_group_empty())
+                                break;
+                        update_shares(tmp);
+                default:
+                        break;
+                }
+
+                if (want_affine && (tmp->flags & SD_WAKE_AFFINE) &&
+                    cpumask_test_cpu(prev_cpu, sched_domain_span(tmp))) {
+
+                        if (wake_affine(tmp, p, sync))
+                                return cpu;
+
+                        want_affine = 0;
+                }
+
+                if (!(tmp->flags & flag))
+                        continue;
+
+                sd = tmp;
+        }
 
         while (sd) {
                 struct sched_group *group;
-                int new_cpu, weight;
+                int weight;
 
                 if (!(sd->flags & flag)) {
                         sd = sd->child;
@@ -1508,7 +1401,7 @@ static int sched_balance_self(int cpu, int flag)
                 /* while loop will break here if sd == NULL */
         }
 
-        return cpu;
+        return new_cpu;
 }
 #endif /* CONFIG_SMP */