printk: Fix log_buf_copy termination.
[linux-2.6.git] / kernel / sched_debug.c
1 /*
2  * kernel/time/sched_debug.c
3  *
4  * Print the CFS rbtree
5  *
6  * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
7  *
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.
11  */
12
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>
18
19 static DEFINE_SPINLOCK(sched_debug_lock);
20
21 /*
22  * This allows printing both to /proc/sched_debug and
23  * to the console
24  */
25 #define SEQ_printf(m, x...)                     \
26  do {                                           \
27         if (m)                                  \
28                 seq_printf(m, x);               \
29         else                                    \
30                 printk(x);                      \
31  } while (0)
32
33 /*
34  * Ease the printing of nsec fields:
35  */
36 static long long nsec_high(unsigned long long nsec)
37 {
38         if ((long long)nsec < 0) {
39                 nsec = -nsec;
40                 do_div(nsec, 1000000);
41                 return -nsec;
42         }
43         do_div(nsec, 1000000);
44
45         return nsec;
46 }
47
48 static unsigned long nsec_low(unsigned long long nsec)
49 {
50         if ((long long)nsec < 0)
51                 nsec = -nsec;
52
53         return do_div(nsec, 1000000);
54 }
55
56 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
57
58 #ifdef CONFIG_FAIR_GROUP_SCHED
59 static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
60 {
61         struct sched_entity *se = tg->se[cpu];
62         if (!se)
63                 return;
64
65 #define P(F) \
66         SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)F)
67 #define PN(F) \
68         SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
69
70         PN(se->exec_start);
71         PN(se->vruntime);
72         PN(se->sum_exec_runtime);
73 #ifdef CONFIG_SCHEDSTATS
74         PN(se->statistics.wait_start);
75         PN(se->statistics.sleep_start);
76         PN(se->statistics.block_start);
77         PN(se->statistics.sleep_max);
78         PN(se->statistics.block_max);
79         PN(se->statistics.exec_max);
80         PN(se->statistics.slice_max);
81         PN(se->statistics.wait_max);
82         PN(se->statistics.wait_sum);
83         P(se->statistics.wait_count);
84 #endif
85         P(se->load.weight);
86 #undef PN
87 #undef P
88 }
89 #endif
90
91 #ifdef CONFIG_CGROUP_SCHED
92 static char group_path[PATH_MAX];
93
94 static char *task_group_path(struct task_group *tg)
95 {
96         if (autogroup_path(tg, group_path, PATH_MAX))
97                 return group_path;
98
99         /*
100          * May be NULL if the underlying cgroup isn't fully-created yet
101          */
102         if (!tg->css.cgroup) {
103                 group_path[0] = '\0';
104                 return group_path;
105         }
106         cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
107         return group_path;
108 }
109 #endif
110
111 static void
112 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
113 {
114         if (rq->curr == p)
115                 SEQ_printf(m, "R");
116         else
117                 SEQ_printf(m, " ");
118
119         SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
120                 p->comm, p->pid,
121                 SPLIT_NS(p->se.vruntime),
122                 (long long)(p->nvcsw + p->nivcsw),
123                 p->prio);
124 #ifdef CONFIG_SCHEDSTATS
125         SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
126                 SPLIT_NS(p->se.vruntime),
127                 SPLIT_NS(p->se.sum_exec_runtime),
128                 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
129 #else
130         SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
131                 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
132 #endif
133 #ifdef CONFIG_CGROUP_SCHED
134         SEQ_printf(m, " %s", task_group_path(task_group(p)));
135 #endif
136
137         SEQ_printf(m, "\n");
138 }
139
140 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
141 {
142         struct task_struct *g, *p;
143         unsigned long flags;
144
145         SEQ_printf(m,
146         "\nrunnable tasks:\n"
147         "            task   PID         tree-key  switches  prio"
148         "     exec-runtime         sum-exec        sum-sleep\n"
149         "------------------------------------------------------"
150         "----------------------------------------------------\n");
151
152         read_lock_irqsave(&tasklist_lock, flags);
153
154         do_each_thread(g, p) {
155                 if (!p->on_rq || task_cpu(p) != rq_cpu)
156                         continue;
157
158                 print_task(m, rq, p);
159         } while_each_thread(g, p);
160
161         read_unlock_irqrestore(&tasklist_lock, flags);
162 }
163
164 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
165 {
166         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
167                 spread, rq0_min_vruntime, spread0;
168         struct rq *rq = cpu_rq(cpu);
169         struct sched_entity *last;
170         unsigned long flags;
171
172 #ifdef CONFIG_FAIR_GROUP_SCHED
173         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
174 #else
175         SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
176 #endif
177         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
178                         SPLIT_NS(cfs_rq->exec_clock));
179
180         raw_spin_lock_irqsave(&rq->lock, flags);
181         if (cfs_rq->rb_leftmost)
182                 MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
183         last = __pick_last_entity(cfs_rq);
184         if (last)
185                 max_vruntime = last->vruntime;
186         min_vruntime = cfs_rq->min_vruntime;
187         rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
188         raw_spin_unlock_irqrestore(&rq->lock, flags);
189         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "MIN_vruntime",
190                         SPLIT_NS(MIN_vruntime));
191         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "min_vruntime",
192                         SPLIT_NS(min_vruntime));
193         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "max_vruntime",
194                         SPLIT_NS(max_vruntime));
195         spread = max_vruntime - MIN_vruntime;
196         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread",
197                         SPLIT_NS(spread));
198         spread0 = min_vruntime - rq0_min_vruntime;
199         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "spread0",
200                         SPLIT_NS(spread0));
201         SEQ_printf(m, "  .%-30s: %d\n", "nr_spread_over",
202                         cfs_rq->nr_spread_over);
203         SEQ_printf(m, "  .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
204         SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
205 #ifdef CONFIG_FAIR_GROUP_SCHED
206 #ifdef CONFIG_SMP
207         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "load_avg",
208                         SPLIT_NS(cfs_rq->load_avg));
209         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "load_period",
210                         SPLIT_NS(cfs_rq->load_period));
211         SEQ_printf(m, "  .%-30s: %ld\n", "load_contrib",
212                         cfs_rq->load_contribution);
213         SEQ_printf(m, "  .%-30s: %d\n", "load_tg",
214                         atomic_read(&cfs_rq->tg->load_weight));
215 #endif
216
217         print_cfs_group_stats(m, cpu, cfs_rq->tg);
218 #endif
219 }
220
221 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
222 {
223 #ifdef CONFIG_RT_GROUP_SCHED
224         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
225 #else
226         SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
227 #endif
228
229 #define P(x) \
230         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
231 #define PN(x) \
232         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
233
234         P(rt_nr_running);
235         P(rt_throttled);
236         PN(rt_time);
237         PN(rt_runtime);
238
239 #undef PN
240 #undef P
241 }
242
243 extern __read_mostly int sched_clock_running;
244
245 static void print_cpu(struct seq_file *m, int cpu)
246 {
247         struct rq *rq = cpu_rq(cpu);
248         unsigned long flags;
249
250 #ifdef CONFIG_X86
251         {
252                 unsigned int freq = cpu_khz ? : 1;
253
254                 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
255                            cpu, freq / 1000, (freq % 1000));
256         }
257 #else
258         SEQ_printf(m, "\ncpu#%d\n", cpu);
259 #endif
260
261 #define P(x) \
262         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x))
263 #define PN(x) \
264         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
265
266         P(nr_running);
267         SEQ_printf(m, "  .%-30s: %lu\n", "load",
268                    rq->load.weight);
269         P(nr_switches);
270         P(nr_load_updates);
271         P(nr_uninterruptible);
272         PN(next_balance);
273         P(curr->pid);
274         PN(clock);
275         P(cpu_load[0]);
276         P(cpu_load[1]);
277         P(cpu_load[2]);
278         P(cpu_load[3]);
279         P(cpu_load[4]);
280 #undef P
281 #undef PN
282
283 #ifdef CONFIG_SCHEDSTATS
284 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
285 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
286
287         P(yld_count);
288
289         P(sched_switch);
290         P(sched_count);
291         P(sched_goidle);
292 #ifdef CONFIG_SMP
293         P64(avg_idle);
294 #endif
295
296         P(ttwu_count);
297         P(ttwu_local);
298
299 #undef P
300 #undef P64
301 #endif
302         spin_lock_irqsave(&sched_debug_lock, flags);
303         print_cfs_stats(m, cpu);
304         print_rt_stats(m, cpu);
305
306         rcu_read_lock();
307         print_rq(m, rq, cpu);
308         rcu_read_unlock();
309         spin_unlock_irqrestore(&sched_debug_lock, flags);
310 }
311
312 static const char *sched_tunable_scaling_names[] = {
313         "none",
314         "logaritmic",
315         "linear"
316 };
317
318 static int sched_debug_show(struct seq_file *m, void *v)
319 {
320         u64 ktime, sched_clk, cpu_clk;
321         unsigned long flags;
322         int cpu;
323
324         local_irq_save(flags);
325         ktime = ktime_to_ns(ktime_get());
326         sched_clk = sched_clock();
327         cpu_clk = local_clock();
328         local_irq_restore(flags);
329
330         SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
331                 init_utsname()->release,
332                 (int)strcspn(init_utsname()->version, " "),
333                 init_utsname()->version);
334
335 #define P(x) \
336         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
337 #define PN(x) \
338         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
339         PN(ktime);
340         PN(sched_clk);
341         PN(cpu_clk);
342         P(jiffies);
343 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
344         P(sched_clock_stable);
345 #endif
346 #undef PN
347 #undef P
348
349         SEQ_printf(m, "\n");
350         SEQ_printf(m, "sysctl_sched\n");
351
352 #define P(x) \
353         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
354 #define PN(x) \
355         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
356         PN(sysctl_sched_latency);
357         PN(sysctl_sched_min_granularity);
358         PN(sysctl_sched_wakeup_granularity);
359         P(sysctl_sched_child_runs_first);
360         P(sysctl_sched_features);
361 #undef PN
362 #undef P
363
364         SEQ_printf(m, "  .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
365                 sysctl_sched_tunable_scaling,
366                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
367
368         for_each_online_cpu(cpu)
369                 print_cpu(m, cpu);
370
371         SEQ_printf(m, "\n");
372
373         return 0;
374 }
375
376 static void sysrq_sched_debug_show(void)
377 {
378         sched_debug_show(NULL, NULL);
379 }
380
381 static int sched_debug_open(struct inode *inode, struct file *filp)
382 {
383         return single_open(filp, sched_debug_show, NULL);
384 }
385
386 static const struct file_operations sched_debug_fops = {
387         .open           = sched_debug_open,
388         .read           = seq_read,
389         .llseek         = seq_lseek,
390         .release        = single_release,
391 };
392
393 static int __init init_sched_debug_procfs(void)
394 {
395         struct proc_dir_entry *pe;
396
397         pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
398         if (!pe)
399                 return -ENOMEM;
400         return 0;
401 }
402
403 __initcall(init_sched_debug_procfs);
404
405 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
406 {
407         unsigned long nr_switches;
408
409         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
410                                                 get_nr_threads(p));
411         SEQ_printf(m,
412                 "---------------------------------------------------------\n");
413 #define __P(F) \
414         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
415 #define P(F) \
416         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
417 #define __PN(F) \
418         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
419 #define PN(F) \
420         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
421
422         PN(se.exec_start);
423         PN(se.vruntime);
424         PN(se.sum_exec_runtime);
425
426         nr_switches = p->nvcsw + p->nivcsw;
427
428 #ifdef CONFIG_SCHEDSTATS
429         PN(se.statistics.wait_start);
430         PN(se.statistics.sleep_start);
431         PN(se.statistics.block_start);
432         PN(se.statistics.sleep_max);
433         PN(se.statistics.block_max);
434         PN(se.statistics.exec_max);
435         PN(se.statistics.slice_max);
436         PN(se.statistics.wait_max);
437         PN(se.statistics.wait_sum);
438         P(se.statistics.wait_count);
439         PN(se.statistics.iowait_sum);
440         P(se.statistics.iowait_count);
441         P(se.nr_migrations);
442         P(se.statistics.nr_migrations_cold);
443         P(se.statistics.nr_failed_migrations_affine);
444         P(se.statistics.nr_failed_migrations_running);
445         P(se.statistics.nr_failed_migrations_hot);
446         P(se.statistics.nr_forced_migrations);
447         P(se.statistics.nr_wakeups);
448         P(se.statistics.nr_wakeups_sync);
449         P(se.statistics.nr_wakeups_migrate);
450         P(se.statistics.nr_wakeups_local);
451         P(se.statistics.nr_wakeups_remote);
452         P(se.statistics.nr_wakeups_affine);
453         P(se.statistics.nr_wakeups_affine_attempts);
454         P(se.statistics.nr_wakeups_passive);
455         P(se.statistics.nr_wakeups_idle);
456
457         {
458                 u64 avg_atom, avg_per_cpu;
459
460                 avg_atom = p->se.sum_exec_runtime;
461                 if (nr_switches)
462                         do_div(avg_atom, nr_switches);
463                 else
464                         avg_atom = -1LL;
465
466                 avg_per_cpu = p->se.sum_exec_runtime;
467                 if (p->se.nr_migrations) {
468                         avg_per_cpu = div64_u64(avg_per_cpu,
469                                                 p->se.nr_migrations);
470                 } else {
471                         avg_per_cpu = -1LL;
472                 }
473
474                 __PN(avg_atom);
475                 __PN(avg_per_cpu);
476         }
477 #endif
478         __P(nr_switches);
479         SEQ_printf(m, "%-35s:%21Ld\n",
480                    "nr_voluntary_switches", (long long)p->nvcsw);
481         SEQ_printf(m, "%-35s:%21Ld\n",
482                    "nr_involuntary_switches", (long long)p->nivcsw);
483
484         P(se.load.weight);
485         P(policy);
486         P(prio);
487 #undef PN
488 #undef __PN
489 #undef P
490 #undef __P
491
492         {
493                 unsigned int this_cpu = raw_smp_processor_id();
494                 u64 t0, t1;
495
496                 t0 = cpu_clock(this_cpu);
497                 t1 = cpu_clock(this_cpu);
498                 SEQ_printf(m, "%-35s:%21Ld\n",
499                            "clock-delta", (long long)(t1-t0));
500         }
501 }
502
503 void proc_sched_set_task(struct task_struct *p)
504 {
505 #ifdef CONFIG_SCHEDSTATS
506         memset(&p->se.statistics, 0, sizeof(p->se.statistics));
507 #endif
508 }