1 files changed, 91 insertions, 9 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 8e2558c2ba67..78f4424b7c43 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -558,6 +558,7 @@ struct rq {
         struct load_weight load;
         unsigned long nr_load_updates;
         u64 nr_switches;
+        u64 nr_migrations_in;
 
         struct cfs_rq cfs;
         struct rt_rq rt;
@@ -668,7 +669,7 @@ static inline int cpu_of(struct rq *rq)
 #define task_rq(p)              cpu_rq(task_cpu(p))
 #define cpu_curr(cpu)           (cpu_rq(cpu)->curr)
 
-static inline void update_rq_clock(struct rq *rq)
+inline void update_rq_clock(struct rq *rq)
 {
         rq->clock = sched_clock_cpu(cpu_of(rq));
 }
@@ -979,6 +980,26 @@ static struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
         }
 }
 
+void curr_rq_lock_irq_save(unsigned long *flags)
+        __acquires(rq->lock)
+{
+        struct rq *rq;
+
+        local_irq_save(*flags);
+        rq = cpu_rq(smp_processor_id());
+        spin_lock(&rq->lock);
+}
+
+void curr_rq_unlock_irq_restore(unsigned long *flags)
+        __releases(rq->lock)
+{
+        struct rq *rq;
+
+        rq = cpu_rq(smp_processor_id());
+        spin_unlock(&rq->lock);
+        local_irq_restore(*flags);
+}
+
 void task_rq_unlock_wait(struct task_struct *p)
 {
         struct rq *rq = task_rq(p);
@@ -1885,12 +1906,15 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
                 p->se.sleep_start -= clock_offset;
         if (p->se.block_start)
                 p->se.block_start -= clock_offset;
+#endif
         if (old_cpu != new_cpu) {
-                schedstat_inc(p, se.nr_migrations);
+                p->se.nr_migrations++;
+                new_rq->nr_migrations_in++;
+#ifdef CONFIG_SCHEDSTATS
                 if (task_hot(p, old_rq->clock, NULL))
                         schedstat_inc(p, se.nr_forced2_migrations);
-        }
 #endif
+        }
         p->se.vruntime -= old_cfsrq->min_vruntime -
                                          new_cfsrq->min_vruntime;
 
@@ -2242,6 +2266,27 @@ static int sched_balance_self(int cpu, int flag)
 
 #endif /* CONFIG_SMP */
 
+/**
+ * task_oncpu_function_call - call a function on the cpu on which a task runs
+ * @p:          the task to evaluate
+ * @func:       the function to be called
+ * @info:       the function call argument
+ *
+ * Calls the function @func when the task is currently running. This might
+ * be on the current CPU, which just calls the function directly
+ */
+void task_oncpu_function_call(struct task_struct *p,
+                              void (*func) (void *info), void *info)
+{
+        int cpu;
+
+        preempt_disable();
+        cpu = task_cpu(p);
+        if (task_curr(p))
+                smp_call_function_single(cpu, func, info, 1);
+        preempt_enable();
+}
+
 /***
  * try_to_wake_up - wake up a thread
  * @p: the to-be-woken-up thread
@@ -2384,6 +2429,7 @@ static void __sched_fork(struct task_struct *p)
         p->se.exec_start                = 0;
         p->se.sum_exec_runtime          = 0;
         p->se.prev_sum_exec_runtime     = 0;
+        p->se.nr_migrations             = 0;
         p->se.last_wakeup               = 0;
         p->se.avg_overlap               = 0;
 
@@ -2604,6 +2650,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
          */
         prev_state = prev->state;
         finish_arch_switch(prev);
+        perf_counter_task_sched_in(current, cpu_of(rq));
         finish_lock_switch(rq, prev);
 #ifdef CONFIG_SMP
         if (current->sched_class->post_schedule)
@@ -2766,6 +2813,21 @@ unsigned long nr_active(void)
 }
 
 /*
+ * Externally visible per-cpu scheduler statistics:
+ * cpu_nr_switches(cpu) - number of context switches on that cpu
+ * cpu_nr_migrations(cpu) - number of migrations into that cpu
+ */
+u64 cpu_nr_switches(int cpu)
+{
+        return cpu_rq(cpu)->nr_switches;
+}
+
+u64 cpu_nr_migrations(int cpu)
+{
+        return cpu_rq(cpu)->nr_migrations_in;
+}
+
+/*
  * Update rq->cpu_load[] statistics. This function is usually called every
  * scheduler tick (TICK_NSEC).
  */
@@ -4137,6 +4199,29 @@ EXPORT_PER_CPU_SYMBOL(kstat);
  * Return any ns on the sched_clock that have not yet been banked in
  * @p in case that task is currently running.
  */
+unsigned long long __task_delta_exec(struct task_struct *p, int update)
+{
+        s64 delta_exec;
+        struct rq *rq;
+
+        rq = task_rq(p);
+        WARN_ON_ONCE(!runqueue_is_locked());
+        WARN_ON_ONCE(!task_current(rq, p));
+
+        if (update)
+                update_rq_clock(rq);
+
+        delta_exec = rq->clock - p->se.exec_start;
+
+        WARN_ON_ONCE(delta_exec < 0);
+
+        return delta_exec;
+}
+
+/*
+ * Return any ns on the sched_clock that have not yet been banked in
+ * @p in case that task is currently running.
+ */
 unsigned long long task_delta_exec(struct task_struct *p)
 {
         unsigned long flags;
@@ -4396,6 +4481,7 @@ void scheduler_tick(void)
         update_rq_clock(rq);
         update_cpu_load(rq);
         curr->sched_class->task_tick(rq, curr, 0);
+        perf_counter_task_tick(curr, cpu);
         spin_unlock(&rq->lock);
 
 #ifdef CONFIG_SMP
@@ -4591,6 +4677,7 @@ need_resched_nonpreemptible:
 
         if (likely(prev != next)) {
                 sched_info_switch(prev, next);
+                perf_counter_task_sched_out(prev, cpu);
 
                 rq->nr_switches++;
                 rq->curr = next;
@@ -5944,12 +6031,7 @@ void sched_show_task(struct task_struct *p)
                 printk(KERN_CONT " %016lx ", thread_saved_pc(p));
 #endif
 #ifdef CONFIG_DEBUG_STACK_USAGE
-        {
-                unsigned long *n = end_of_stack(p);
-                while (!*n)
-                        n++;
-                free = (unsigned long)n - (unsigned long)end_of_stack(p);
-        }
+        free = stack_not_used(p);
 #endif
         printk(KERN_CONT "%5lu %5d %6d\n", free,
                 task_pid_nr(p), task_pid_nr(p->real_parent));