Merge branch 'linus' into perfcounters/core-v2

[linux-drm-fsl-dcu.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index bec249885e174c398c5e71aef05194579c9418dc..39e7086021697ddfbea15b4cf5cf6013953c3b08 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -577,6 +577,7 @@ 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;
@@ -685,7 +686,7 @@ 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));
 }
@@ -996,6 +997,26 @@ 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);
@@ -1947,12 +1968,15 @@ 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;
 
@@ -2304,6 +2328,27 @@ 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
@@ -2460,6 +2505,7 @@ 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;
        p->se.start_runtime             = 0;
@@ -2690,6 +2736,7 @@ 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 (post_schedule)
@@ -2851,6 +2898,21 @@ unsigned long nr_active(void)
        return running + uninterruptible;
 }
 
+/*
+ * 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).
@@ -4502,6 +4564,29 @@ DEFINE_PER_CPU(struct kernel_stat, kstat);
 
 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.
@@ -4765,6 +4850,7 @@ 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
@@ -4980,6 +5066,7 @@ 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;