sched: move code into kernel/sched_stats.h

create sched_stats.h and move sched.c schedstats code into it.
This cleans up sched.c a bit.

no code changes are caused by this patch.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 233 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index ac4d26241d1e..f8b8eda4494d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -460,134 +460,6 @@ static inline void task_rq_unlock(struct rq *rq, unsigned long *flags)
         spin_unlock_irqrestore(&rq->lock, *flags);
 }
 
-#ifdef CONFIG_SCHEDSTATS
-/*
- * bump this up when changing the output format or the meaning of an existing
- * format, so that tools can adapt (or abort)
- */
-#define SCHEDSTAT_VERSION 14
-
-static int show_schedstat(struct seq_file *seq, void *v)
-{
-        int cpu;
-
-        seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
-        seq_printf(seq, "timestamp %lu\n", jiffies);
-        for_each_online_cpu(cpu) {
-                struct rq *rq = cpu_rq(cpu);
-#ifdef CONFIG_SMP
-                struct sched_domain *sd;
-                int dcnt = 0;
-#endif
-
-                /* runqueue-specific stats */
-                seq_printf(seq,
-                    "cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
-                    cpu, rq->yld_both_empty,
-                    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_cnt,
-                    rq->sched_switch, rq->sched_cnt, rq->sched_goidle,
-                    rq->ttwu_cnt, rq->ttwu_local,
-                    rq->rq_sched_info.cpu_time,
-                    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcnt);
-
-                seq_printf(seq, "\n");
-
-#ifdef CONFIG_SMP
-                /* domain-specific stats */
-                preempt_disable();
-                for_each_domain(cpu, sd) {
-                        enum cpu_idle_type itype;
-                        char mask_str[NR_CPUS];
-
-                        cpumask_scnprintf(mask_str, NR_CPUS, sd->span);
-                        seq_printf(seq, "domain%d %s", dcnt++, mask_str);
-                        for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
-                                        itype++) {
-                                seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu "
-                                                "%lu",
-                                    sd->lb_cnt[itype],
-                                    sd->lb_balanced[itype],
-                                    sd->lb_failed[itype],
-                                    sd->lb_imbalance[itype],
-                                    sd->lb_gained[itype],
-                                    sd->lb_hot_gained[itype],
-                                    sd->lb_nobusyq[itype],
-                                    sd->lb_nobusyg[itype]);
-                        }
-                        seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu %lu %lu"
-                            " %lu %lu %lu\n",
-                            sd->alb_cnt, sd->alb_failed, sd->alb_pushed,
-                            sd->sbe_cnt, sd->sbe_balanced, sd->sbe_pushed,
-                            sd->sbf_cnt, sd->sbf_balanced, sd->sbf_pushed,
-                            sd->ttwu_wake_remote, sd->ttwu_move_affine,
-                            sd->ttwu_move_balance);
-                }
-                preempt_enable();
-#endif
-        }
-        return 0;
-}
-
-static int schedstat_open(struct inode *inode, struct file *file)
-{
-        unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
-        char *buf = kmalloc(size, GFP_KERNEL);
-        struct seq_file *m;
-        int res;
-
-        if (!buf)
-                return -ENOMEM;
-        res = single_open(file, show_schedstat, NULL);
-        if (!res) {
-                m = file->private_data;
-                m->buf = buf;
-                m->size = size;
-        } else
-                kfree(buf);
-        return res;
-}
-
-const struct file_operations proc_schedstat_operations = {
-        .open    = schedstat_open,
-        .read    = seq_read,
-        .llseek  = seq_lseek,
-        .release = single_release,
-};
-
-/*
- * Expects runqueue lock to be held for atomicity of update
- */
-static inline void
-rq_sched_info_arrive(struct rq *rq, unsigned long delta_jiffies)
-{
-        if (rq) {
-                rq->rq_sched_info.run_delay += delta_jiffies;
-                rq->rq_sched_info.pcnt++;
-        }
-}
-
-/*
- * Expects runqueue lock to be held for atomicity of update
- */
-static inline void
-rq_sched_info_depart(struct rq *rq, unsigned long delta_jiffies)
-{
-        if (rq)
-                rq->rq_sched_info.cpu_time += delta_jiffies;
-}
-# define schedstat_inc(rq, field)       do { (rq)->field++; } while (0)
-# define schedstat_add(rq, field, amt)  do { (rq)->field += (amt); } while (0)
-#else /* !CONFIG_SCHEDSTATS */
-static inline void
-rq_sched_info_arrive(struct rq *rq, unsigned long delta_jiffies)
-{}
-static inline void
-rq_sched_info_depart(struct rq *rq, unsigned long delta_jiffies)
-{}
-# define schedstat_inc(rq, field)       do { } while (0)
-# define schedstat_add(rq, field, amt)  do { } while (0)
-#endif
-
 /*
  * this_rq_lock - lock this runqueue and disable interrupts.
  */
@@ -603,111 +475,7 @@ static inline struct rq *this_rq_lock(void)
         return rq;
 }
 
-#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
-/*
- * Called when a process is dequeued from the active array and given
- * the cpu.  We should note that with the exception of interactive
- * tasks, the expired queue will become the active queue after the active
- * queue is empty, without explicitly dequeuing and requeuing tasks in the
- * expired queue.  (Interactive tasks may be requeued directly to the
- * active queue, thus delaying tasks in the expired queue from running;
- * see scheduler_tick()).
- *
- * This function is only called from sched_info_arrive(), rather than
- * dequeue_task(). Even though a task may be queued and dequeued multiple
- * times as it is shuffled about, we're really interested in knowing how
- * long it was from the *first* time it was queued to the time that it
- * finally hit a cpu.
- */
-static inline void sched_info_dequeued(struct task_struct *t)
-{
-        t->sched_info.last_queued = 0;
-}
-
-/*
- * Called when a task finally hits the cpu.  We can now calculate how
- * long it was waiting to run.  We also note when it began so that we
- * can keep stats on how long its timeslice is.
- */
-static void sched_info_arrive(struct task_struct *t)
-{
-        unsigned long now = jiffies, delta_jiffies = 0;
-
-        if (t->sched_info.last_queued)
-                delta_jiffies = now - t->sched_info.last_queued;
-        sched_info_dequeued(t);
-        t->sched_info.run_delay += delta_jiffies;
-        t->sched_info.last_arrival = now;
-        t->sched_info.pcnt++;
-
-        rq_sched_info_arrive(task_rq(t), delta_jiffies);
-}
-
-/*
- * Called when a process is queued into either the active or expired
- * array.  The time is noted and later used to determine how long we
- * had to wait for us to reach the cpu.  Since the expired queue will
- * become the active queue after active queue is empty, without dequeuing
- * and requeuing any tasks, we are interested in queuing to either. It
- * is unusual but not impossible for tasks to be dequeued and immediately
- * requeued in the same or another array: this can happen in sched_yield(),
- * set_user_nice(), and even load_balance() as it moves tasks from runqueue
- * to runqueue.
- *
- * This function is only called from enqueue_task(), but also only updates
- * the timestamp if it is already not set.  It's assumed that
- * sched_info_dequeued() will clear that stamp when appropriate.
- */
-static inline void sched_info_queued(struct task_struct *t)
-{
-        if (unlikely(sched_info_on()))
-                if (!t->sched_info.last_queued)
-                        t->sched_info.last_queued = jiffies;
-}
-
-/*
- * Called when a process ceases being the active-running process, either
- * voluntarily or involuntarily.  Now we can calculate how long we ran.
- */
-static inline void sched_info_depart(struct task_struct *t)
-{
-        unsigned long delta_jiffies = jiffies - t->sched_info.last_arrival;
-
-        t->sched_info.cpu_time += delta_jiffies;
-        rq_sched_info_depart(task_rq(t), delta_jiffies);
-}
-
-/*
- * Called when tasks are switched involuntarily due, typically, to expiring
- * their time slice.  (This may also be called when switching to or from
- * the idle task.)  We are only called when prev != next.
- */
-static inline void
-__sched_info_switch(struct task_struct *prev, struct task_struct *next)
-{
-        struct rq *rq = task_rq(prev);
-
-        /*
-         * prev now departs the cpu.  It's not interesting to record
-         * stats about how efficient we were at scheduling the idle
-         * process, however.
-         */
-        if (prev != rq->idle)
-                sched_info_depart(prev);
-
-        if (next != rq->idle)
-                sched_info_arrive(next);
-}
-static inline void
-sched_info_switch(struct task_struct *prev, struct task_struct *next)
-{
-        if (unlikely(sched_info_on()))
-                __sched_info_switch(prev, next);
-}
-#else
-#define sched_info_queued(t)            do { } while (0)
-#define sched_info_switch(t, next)      do { } while (0)
-#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
+#include "sched_stats.h"
 
 /*
  * Adding/removing a task to/from a priority array: