2 * kernel/time/sched_debug.c
6 * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/proc_fs.h>
14 #include <linux/sched.h>
15 #include <linux/seq_file.h>
16 #include <linux/kallsyms.h>
17 #include <linux/utsname.h>
20 * This allows printing both to /proc/sched_debug and
23 #define SEQ_printf(m, x...) \
32 * Ease the printing of nsec fields:
34 static long long nsec_high(long long nsec)
38 do_div(nsec, 1000000);
41 do_div(nsec, 1000000);
46 static unsigned long nsec_low(long long nsec)
51 return do_div(nsec, 1000000);
54 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
57 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
64 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
66 SPLIT_NS(p->se.vruntime),
67 (long long)(p->nvcsw + p->nivcsw),
69 #ifdef CONFIG_SCHEDSTATS
70 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n",
71 SPLIT_NS(p->se.vruntime),
72 SPLIT_NS(p->se.sum_exec_runtime),
73 SPLIT_NS(p->se.sum_sleep_runtime));
75 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n",
76 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
80 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
82 struct task_struct *g, *p;
86 " task PID tree-key switches prio"
87 " exec-runtime sum-exec sum-sleep\n"
88 "------------------------------------------------------"
89 "----------------------------------------------------\n");
91 read_lock_irq(&tasklist_lock);
93 do_each_thread(g, p) {
94 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
98 } while_each_thread(g, p);
100 read_unlock_irq(&tasklist_lock);
103 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
105 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
106 spread, rq0_min_vruntime, spread0;
107 struct rq *rq = &per_cpu(runqueues, cpu);
108 struct sched_entity *last;
111 SEQ_printf(m, "\ncfs_rq\n");
113 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
114 SPLIT_NS(cfs_rq->exec_clock));
116 spin_lock_irqsave(&rq->lock, flags);
117 if (cfs_rq->rb_leftmost)
118 MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
119 last = __pick_last_entity(cfs_rq);
121 max_vruntime = last->vruntime;
122 min_vruntime = rq->cfs.min_vruntime;
123 rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
124 spin_unlock_irqrestore(&rq->lock, flags);
125 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
126 SPLIT_NS(MIN_vruntime));
127 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
128 SPLIT_NS(min_vruntime));
129 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
130 SPLIT_NS(max_vruntime));
131 spread = max_vruntime - MIN_vruntime;
132 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
134 spread0 = min_vruntime - rq0_min_vruntime;
135 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
137 SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
138 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
139 SEQ_printf(m, " .%-30s: %ld\n", "bkl_cnt",
143 static void print_cpu(struct seq_file *m, int cpu)
145 struct rq *rq = &per_cpu(runqueues, cpu);
149 unsigned int freq = cpu_khz ? : 1;
151 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
152 cpu, freq / 1000, (freq % 1000));
155 SEQ_printf(m, "\ncpu#%d\n", cpu);
159 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
161 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
164 SEQ_printf(m, " .%-30s: %lu\n", "load",
168 P(nr_uninterruptible);
169 SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies);
177 P(clock_deep_idle_events);
187 print_cfs_stats(m, cpu);
189 print_rq(m, rq, cpu);
192 static int sched_debug_show(struct seq_file *m, void *v)
194 u64 now = ktime_to_ns(ktime_get());
197 SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",
198 init_utsname()->release,
199 (int)strcspn(init_utsname()->version, " "),
200 init_utsname()->version);
202 SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now));
204 for_each_online_cpu(cpu)
212 static void sysrq_sched_debug_show(void)
214 sched_debug_show(NULL, NULL);
217 #ifdef CONFIG_FAIR_USER_SCHED
219 static DEFINE_MUTEX(root_user_share_mutex);
222 root_user_share_read_proc(char *page, char **start, off_t off, int count,
223 int *eof, void *data)
227 len = sprintf(page, "%d\n", init_task_grp_load);
233 root_user_share_write_proc(struct file *file, const char __user *buffer,
234 unsigned long count, void *data)
236 unsigned long shares;
237 char kbuf[sizeof(unsigned long)+1];
240 if (copy_from_user(kbuf, buffer, sizeof(kbuf)))
243 shares = simple_strtoul(kbuf, NULL, 0);
246 shares = NICE_0_LOAD;
248 mutex_lock(&root_user_share_mutex);
250 init_task_grp_load = shares;
251 rc = sched_group_set_shares(&init_task_grp, shares);
253 mutex_unlock(&root_user_share_mutex);
255 return (rc < 0 ? rc : count);
258 #endif /* CONFIG_FAIR_USER_SCHED */
260 static int sched_debug_open(struct inode *inode, struct file *filp)
262 return single_open(filp, sched_debug_show, NULL);
265 static struct file_operations sched_debug_fops = {
266 .open = sched_debug_open,
269 .release = single_release,
272 static int __init init_sched_debug_procfs(void)
274 struct proc_dir_entry *pe;
276 pe = create_proc_entry("sched_debug", 0644, NULL);
280 pe->proc_fops = &sched_debug_fops;
282 #ifdef CONFIG_FAIR_USER_SCHED
283 pe = create_proc_entry("root_user_share", 0644, NULL);
287 pe->read_proc = root_user_share_read_proc;
288 pe->write_proc = root_user_share_write_proc;
294 __initcall(init_sched_debug_procfs);
296 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
302 if (lock_task_sighand(p, &flags)) {
303 num_threads = atomic_read(&p->signal->count);
304 unlock_task_sighand(p, &flags);
308 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
309 SEQ_printf(m, "----------------------------------------------\n");
311 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
313 SEQ_printf(m, "%-25s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
317 PN(se.sum_exec_runtime);
319 #ifdef CONFIG_SCHEDSTATS
328 P(sched_info.bkl_cnt);
330 SEQ_printf(m, "%-25s:%20Ld\n",
331 "nr_switches", (long long)(p->nvcsw + p->nivcsw));
343 SEQ_printf(m, "%-25s:%20Ld\n",
344 "clock-delta", (long long)(t1-t0));
348 void proc_sched_set_task(struct task_struct *p)
350 #ifdef CONFIG_SCHEDSTATS
356 p->sched_info.bkl_cnt = 0;
358 p->se.sum_exec_runtime = 0;
359 p->se.prev_sum_exec_runtime = 0;