303 lines
6.6 KiB
C
303 lines
6.6 KiB
C
/*
|
|
* kernel/time/sched_debug.c
|
|
*
|
|
* Print the CFS rbtree
|
|
*
|
|
* Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/utsname.h>
|
|
|
|
/*
|
|
* This allows printing both to /proc/sched_debug and
|
|
* to the console
|
|
*/
|
|
#define SEQ_printf(m, x...) \
|
|
do { \
|
|
if (m) \
|
|
seq_printf(m, x); \
|
|
else \
|
|
printk(x); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Ease the printing of nsec fields:
|
|
*/
|
|
static long long nsec_high(long long nsec)
|
|
{
|
|
if (nsec < 0) {
|
|
nsec = -nsec;
|
|
do_div(nsec, 1000000);
|
|
return -nsec;
|
|
}
|
|
do_div(nsec, 1000000);
|
|
|
|
return nsec;
|
|
}
|
|
|
|
static unsigned long nsec_low(long long nsec)
|
|
{
|
|
if (nsec < 0)
|
|
nsec = -nsec;
|
|
|
|
return do_div(nsec, 1000000);
|
|
}
|
|
|
|
#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
|
|
|
|
static void
|
|
print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
|
|
{
|
|
if (rq->curr == p)
|
|
SEQ_printf(m, "R");
|
|
else
|
|
SEQ_printf(m, " ");
|
|
|
|
SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
|
|
p->comm, p->pid,
|
|
SPLIT_NS(p->se.vruntime),
|
|
(long long)(p->nvcsw + p->nivcsw),
|
|
p->prio);
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
SEQ_printf(m, "%15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n",
|
|
SPLIT_NS(p->se.vruntime),
|
|
SPLIT_NS(p->se.sum_exec_runtime),
|
|
SPLIT_NS(p->se.sum_sleep_runtime));
|
|
#else
|
|
SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n",
|
|
0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
|
|
#endif
|
|
}
|
|
|
|
static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
|
|
{
|
|
struct task_struct *g, *p;
|
|
|
|
SEQ_printf(m,
|
|
"\nrunnable tasks:\n"
|
|
" task PID tree-key switches prio"
|
|
" exec-runtime sum-exec sum-sleep\n"
|
|
"------------------------------------------------------"
|
|
"------------------------------------------------");
|
|
|
|
read_lock_irq(&tasklist_lock);
|
|
|
|
do_each_thread(g, p) {
|
|
if (!p->se.on_rq || task_cpu(p) != rq_cpu)
|
|
continue;
|
|
|
|
print_task(m, rq, p);
|
|
} while_each_thread(g, p);
|
|
|
|
read_unlock_irq(&tasklist_lock);
|
|
}
|
|
|
|
void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
|
|
{
|
|
s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
|
|
spread, rq0_min_vruntime, spread0;
|
|
struct rq *rq = &per_cpu(runqueues, cpu);
|
|
struct sched_entity *last;
|
|
unsigned long flags;
|
|
|
|
SEQ_printf(m, "\ncfs_rq\n");
|
|
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
|
|
SPLIT_NS(cfs_rq->exec_clock));
|
|
|
|
spin_lock_irqsave(&rq->lock, flags);
|
|
if (cfs_rq->rb_leftmost)
|
|
MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
|
|
last = __pick_last_entity(cfs_rq);
|
|
if (last)
|
|
max_vruntime = last->vruntime;
|
|
min_vruntime = rq->cfs.min_vruntime;
|
|
rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
|
|
spin_unlock_irqrestore(&rq->lock, flags);
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
|
|
SPLIT_NS(MIN_vruntime));
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
|
|
SPLIT_NS(min_vruntime));
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
|
|
SPLIT_NS(max_vruntime));
|
|
spread = max_vruntime - MIN_vruntime;
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
|
|
SPLIT_NS(spread));
|
|
spread0 = min_vruntime - rq0_min_vruntime;
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
|
|
SPLIT_NS(spread0));
|
|
}
|
|
|
|
static void print_cpu(struct seq_file *m, int cpu)
|
|
{
|
|
struct rq *rq = &per_cpu(runqueues, cpu);
|
|
|
|
#ifdef CONFIG_X86
|
|
{
|
|
unsigned int freq = cpu_khz ? : 1;
|
|
|
|
SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
|
|
cpu, freq / 1000, (freq % 1000));
|
|
}
|
|
#else
|
|
SEQ_printf(m, "\ncpu#%d\n", cpu);
|
|
#endif
|
|
|
|
#define P(x) \
|
|
SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
|
|
#define PN(x) \
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
|
|
|
|
P(nr_running);
|
|
SEQ_printf(m, " .%-30s: %lu\n", "load",
|
|
rq->load.weight);
|
|
P(nr_switches);
|
|
P(nr_load_updates);
|
|
P(nr_uninterruptible);
|
|
SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies);
|
|
PN(next_balance);
|
|
P(curr->pid);
|
|
PN(clock);
|
|
PN(idle_clock);
|
|
PN(prev_clock_raw);
|
|
P(clock_warps);
|
|
P(clock_overflows);
|
|
P(clock_deep_idle_events);
|
|
PN(clock_max_delta);
|
|
P(cpu_load[0]);
|
|
P(cpu_load[1]);
|
|
P(cpu_load[2]);
|
|
P(cpu_load[3]);
|
|
P(cpu_load[4]);
|
|
#undef P
|
|
#undef PN
|
|
|
|
print_cfs_stats(m, cpu);
|
|
|
|
print_rq(m, rq, cpu);
|
|
}
|
|
|
|
static int sched_debug_show(struct seq_file *m, void *v)
|
|
{
|
|
u64 now = ktime_to_ns(ktime_get());
|
|
int cpu;
|
|
|
|
SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",
|
|
init_utsname()->release,
|
|
(int)strcspn(init_utsname()->version, " "),
|
|
init_utsname()->version);
|
|
|
|
SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now));
|
|
|
|
for_each_online_cpu(cpu)
|
|
print_cpu(m, cpu);
|
|
|
|
SEQ_printf(m, "\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sysrq_sched_debug_show(void)
|
|
{
|
|
sched_debug_show(NULL, NULL);
|
|
}
|
|
|
|
static int sched_debug_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, sched_debug_show, NULL);
|
|
}
|
|
|
|
static struct file_operations sched_debug_fops = {
|
|
.open = sched_debug_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init init_sched_debug_procfs(void)
|
|
{
|
|
struct proc_dir_entry *pe;
|
|
|
|
pe = create_proc_entry("sched_debug", 0644, NULL);
|
|
if (!pe)
|
|
return -ENOMEM;
|
|
|
|
pe->proc_fops = &sched_debug_fops;
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(init_sched_debug_procfs);
|
|
|
|
void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
|
|
{
|
|
unsigned long flags;
|
|
int num_threads = 1;
|
|
|
|
rcu_read_lock();
|
|
if (lock_task_sighand(p, &flags)) {
|
|
num_threads = atomic_read(&p->signal->count);
|
|
unlock_task_sighand(p, &flags);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
|
|
SEQ_printf(m, "----------------------------------------------\n");
|
|
#define P(F) \
|
|
SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
|
|
#define PN(F) \
|
|
SEQ_printf(m, "%-25s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
|
|
|
|
PN(se.exec_start);
|
|
PN(se.vruntime);
|
|
PN(se.sum_exec_runtime);
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
PN(se.wait_start);
|
|
PN(se.sleep_start);
|
|
PN(se.block_start);
|
|
PN(se.sleep_max);
|
|
PN(se.block_max);
|
|
PN(se.exec_max);
|
|
PN(se.slice_max);
|
|
PN(se.wait_max);
|
|
#endif
|
|
SEQ_printf(m, "%-25s:%20Ld\n",
|
|
"nr_switches", (long long)(p->nvcsw + p->nivcsw));
|
|
P(se.load.weight);
|
|
P(policy);
|
|
P(prio);
|
|
#undef P
|
|
#undef PN
|
|
|
|
{
|
|
u64 t0, t1;
|
|
|
|
t0 = sched_clock();
|
|
t1 = sched_clock();
|
|
SEQ_printf(m, "%-25s:%20Ld\n",
|
|
"clock-delta", (long long)(t1-t0));
|
|
}
|
|
}
|
|
|
|
void proc_sched_set_task(struct task_struct *p)
|
|
{
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
p->se.sleep_max = 0;
|
|
p->se.block_max = 0;
|
|
p->se.exec_max = 0;
|
|
p->se.slice_max = 0;
|
|
p->se.wait_max = 0;
|
|
#endif
|
|
p->se.sum_exec_runtime = 0;
|
|
p->se.prev_sum_exec_runtime = 0;
|
|
}
|