static int show_schedstat(struct seq_file *seq, void *v)
{
int cpu;
+ int mask_len = NR_CPUS/32 * 9;
+ char *mask_str = kmalloc(mask_len, GFP_KERNEL);
+
+ if (mask_str == NULL)
+ return -ENOMEM;
seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
seq_printf(seq, "timestamp %lu\n", jiffies);
struct rq *rq = cpu_rq(cpu);
#ifdef CONFIG_SMP
struct sched_domain *sd;
- int dcnt = 0;
+ int dcount = 0;
#endif
/* runqueue-specific stats */
seq_printf(seq,
- "cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %llu %llu %lu",
+ "cpu%d %u %u %u %u %u %u %u %u %u %llu %llu %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->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
+ rq->sched_switch, rq->sched_count, rq->sched_goidle,
+ rq->ttwu_count, rq->ttwu_local,
rq->rq_sched_info.cpu_time,
- rq->rq_sched_info.run_delay, rq->rq_sched_info.pcnt);
+ rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
seq_printf(seq, "\n");
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);
+ cpumask_scnprintf(mask_str, mask_len, sd->span);
+ seq_printf(seq, "domain%d %s", dcount++, 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],
+ seq_printf(seq, " %u %u %u %u %u %u %u %u",
+ sd->lb_count[itype],
sd->lb_balanced[itype],
sd->lb_failed[itype],
sd->lb_imbalance[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,
+ seq_printf(seq,
+ " %u %u %u %u %u %u %u %u %u %u %u %u\n",
+ sd->alb_count, sd->alb_failed, sd->alb_pushed,
+ sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
+ sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
sd->ttwu_wake_remote, sd->ttwu_move_affine,
sd->ttwu_move_balance);
}
preempt_enable();
#endif
}
+ kfree(mask_str);
return 0;
}
{
if (rq) {
rq->rq_sched_info.run_delay += delta;
- rq->rq_sched_info.pcnt++;
+ rq->rq_sched_info.pcount++;
}
}
if (rq)
rq->rq_sched_info.cpu_time += delta;
}
+
+static inline void
+rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
+{
+ if (rq)
+ rq->rq_sched_info.run_delay += delta;
+}
# define schedstat_inc(rq, field) do { (rq)->field++; } while (0)
# define schedstat_add(rq, field, amt) do { (rq)->field += (amt); } while (0)
# define schedstat_set(var, val) do { var = (val); } while (0)
rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
{}
static inline void
+rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
+{}
+static inline void
rq_sched_info_depart(struct rq *rq, unsigned long long delta)
{}
# define schedstat_inc(rq, field) do { } while (0)
#endif
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
+static inline void sched_info_reset_dequeued(struct task_struct *t)
+{
+ t->sched_info.last_queued = 0;
+}
+
/*
* Called when a process is dequeued from the active array and given
* the cpu. We should note that with the exception of interactive
* 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.
+ * Though we are interested in knowing how long it was from the *first* time a
+ * task was queued to the time that it finally hit a cpu, we call this routine
+ * from dequeue_task() to account for possible rq->clock skew across cpus. The
+ * delta taken on each cpu would annul the skew.
*/
static inline void sched_info_dequeued(struct task_struct *t)
{
- t->sched_info.last_queued = 0;
+ unsigned long long now = task_rq(t)->clock, delta = 0;
+
+ if (unlikely(sched_info_on()))
+ if (t->sched_info.last_queued)
+ delta = now - t->sched_info.last_queued;
+ sched_info_reset_dequeued(t);
+ t->sched_info.run_delay += delta;
+
+ rq_sched_info_dequeued(task_rq(t), delta);
}
/*
*/
static void sched_info_arrive(struct task_struct *t)
{
- unsigned long long now = sched_clock(), delta = 0;
+ unsigned long long now = task_rq(t)->clock, delta = 0;
if (t->sched_info.last_queued)
delta = now - t->sched_info.last_queued;
- sched_info_dequeued(t);
+ sched_info_reset_dequeued(t);
t->sched_info.run_delay += delta;
t->sched_info.last_arrival = now;
- t->sched_info.pcnt++;
+ t->sched_info.pcount++;
rq_sched_info_arrive(task_rq(t), delta);
}
{
if (unlikely(sched_info_on()))
if (!t->sched_info.last_queued)
- t->sched_info.last_queued = sched_clock();
+ t->sched_info.last_queued = task_rq(t)->clock;
}
/*
* Called when a process ceases being the active-running process, either
* voluntarily or involuntarily. Now we can calculate how long we ran.
+ * Also, if the process is still in the TASK_RUNNING state, call
+ * sched_info_queued() to mark that it has now again started waiting on
+ * the runqueue.
*/
static inline void sched_info_depart(struct task_struct *t)
{
- unsigned long long delta = sched_clock() - t->sched_info.last_arrival;
+ unsigned long long delta = task_rq(t)->clock -
+ t->sched_info.last_arrival;
t->sched_info.cpu_time += delta;
rq_sched_info_depart(task_rq(t), delta);
+
+ if (t->state == TASK_RUNNING)
+ sched_info_queued(t);
}
/*
__sched_info_switch(prev, next);
}
#else
-#define sched_info_queued(t) do { } while (0)
-#define sched_info_switch(t, next) do { } while (0)
+#define sched_info_queued(t) do { } while (0)
+#define sched_info_reset_dequeued(t) do { } while (0)
+#define sched_info_dequeued(t) do { } while (0)
+#define sched_info_switch(t, next) do { } while (0)
#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff