Merge branch 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

[pandora-kernel.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index 0516af4..2d12893 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -293,7 +293,7 @@ static DEFINE_SPINLOCK(task_group_lock);
  *  limitation from this.)
  */
 #define MIN_SHARES     2
-#define MAX_SHARES     (1UL << 18)
+#define MAX_SHARES     (1UL << (18 + SCHED_LOAD_RESOLUTION))
 
 static int root_task_group_load = ROOT_TASK_GROUP_LOAD;
 #endif
@@ -1330,13 +1330,25 @@ calc_delta_mine(unsigned long delta_exec, unsigned long weight,
 {
        u64 tmp;
 
-       tmp = (u64)delta_exec * weight;
+       /*
+        * weight can be less than 2^SCHED_LOAD_RESOLUTION for task group sched
+        * entities since MIN_SHARES = 2. Treat weight as 1 if less than
+        * 2^SCHED_LOAD_RESOLUTION.
+        */
+       if (likely(weight > (1UL << SCHED_LOAD_RESOLUTION)))
+               tmp = (u64)delta_exec * scale_load_down(weight);
+       else
+               tmp = (u64)delta_exec;
 
        if (!lw->inv_weight) {
-               if (BITS_PER_LONG > 32 && unlikely(lw->weight >= WMULT_CONST))
+               unsigned long w = scale_load_down(lw->weight);
+
+               if (BITS_PER_LONG > 32 && unlikely(w >= WMULT_CONST))
                        lw->inv_weight = 1;
+               else if (unlikely(!w))
+                       lw->inv_weight = WMULT_CONST;
                else
-                       lw->inv_weight = WMULT_CONST / lw->weight;
+                       lw->inv_weight = WMULT_CONST / w;
        }
 
        /*
@@ -1778,17 +1790,20 @@ static void dec_nr_running(struct rq *rq)
 
 static void set_load_weight(struct task_struct *p)
 {
+       int prio = p->static_prio - MAX_RT_PRIO;
+       struct load_weight *load = &p->se.load;
+
        /*
         * SCHED_IDLE tasks get minimal weight:
         */
        if (p->policy == SCHED_IDLE) {
-               p->se.load.weight = WEIGHT_IDLEPRIO;
-               p->se.load.inv_weight = WMULT_IDLEPRIO;
+               load->weight = scale_load(WEIGHT_IDLEPRIO);
+               load->inv_weight = WMULT_IDLEPRIO;
                return;
        }
 
-       p->se.load.weight = prio_to_weight[p->static_prio - MAX_RT_PRIO];
-       p->se.load.inv_weight = prio_to_wmult[p->static_prio - MAX_RT_PRIO];
+       load->weight = scale_load(prio_to_weight[prio]);
+       load->inv_weight = prio_to_wmult[prio];
 }
 
 static void enqueue_task(struct rq *rq, struct task_struct *p, int flags)
@@ -6527,7 +6542,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
                cpulist_scnprintf(str, sizeof(str), sched_group_cpus(group));
 
                printk(KERN_CONT " %s", str);
-               if (group->cpu_power != SCHED_LOAD_SCALE) {
+               if (group->cpu_power != SCHED_POWER_SCALE) {
                        printk(KERN_CONT " (cpu_power = %d)",
                                group->cpu_power);
                }
@@ -7902,7 +7917,7 @@ void __init sched_init(void)
 #ifdef CONFIG_SMP
                rq->sd = NULL;
                rq->rd = NULL;
-               rq->cpu_power = SCHED_LOAD_SCALE;
+               rq->cpu_power = SCHED_POWER_SCALE;
                rq->post_schedule = 0;
                rq->active_balance = 0;
                rq->next_balance = jiffies;
@@ -8806,14 +8821,14 @@ cpu_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
 static int cpu_shares_write_u64(struct cgroup *cgrp, struct cftype *cftype,
                                u64 shareval)
 {
-       return sched_group_set_shares(cgroup_tg(cgrp), shareval);
+       return sched_group_set_shares(cgroup_tg(cgrp), scale_load(shareval));
 }
 
 static u64 cpu_shares_read_u64(struct cgroup *cgrp, struct cftype *cft)
 {
        struct task_group *tg = cgroup_tg(cgrp);
 
-       return (u64) tg->shares;
+       return (u64) scale_load_down(tg->shares);
 }
 #endif /* CONFIG_FAIR_GROUP_SCHED */