powerpc: Fix build errors STRICT_MM_TYPECHECKS
[pandora-kernel.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 #ifdef CONFIG_CFS_BANDWIDTH
217         SEQ_printf(m, "  .%-30s: %d\n", "tg->cfs_bandwidth.timer_active",
218                         cfs_rq->tg->cfs_bandwidth.timer_active);
219         SEQ_printf(m, "  .%-30s: %d\n", "throttled",
220                         cfs_rq->throttled);
221         SEQ_printf(m, "  .%-30s: %d\n", "throttle_count",
222                         cfs_rq->throttle_count);
223 #endif
224
225         print_cfs_group_stats(m, cpu, cfs_rq->tg);
226 #endif
227 }
228
229 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
230 {
231 #ifdef CONFIG_RT_GROUP_SCHED
232         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
233 #else
234         SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
235 #endif
236
237 #define P(x) \
238         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
239 #define PN(x) \
240         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
241
242         P(rt_nr_running);
243         P(rt_throttled);
244         PN(rt_time);
245         PN(rt_runtime);
246
247 #undef PN
248 #undef P
249 }
250
251 extern __read_mostly int sched_clock_running;
252
253 static void print_cpu(struct seq_file *m, int cpu)
254 {
255         struct rq *rq = cpu_rq(cpu);
256         unsigned long flags;
257
258 #ifdef CONFIG_X86
259         {
260                 unsigned int freq = cpu_khz ? : 1;
261
262                 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
263                            cpu, freq / 1000, (freq % 1000));
264         }
265 #else
266         SEQ_printf(m, "\ncpu#%d\n", cpu);
267 #endif
268
269 #define P(x) \
270         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x))
271 #define PN(x) \
272         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
273
274         P(nr_running);
275         SEQ_printf(m, "  .%-30s: %lu\n", "load",
276                    rq->load.weight);
277         P(nr_switches);
278         P(nr_load_updates);
279         P(nr_uninterruptible);
280         PN(next_balance);
281         P(curr->pid);
282         PN(clock);
283         P(cpu_load[0]);
284         P(cpu_load[1]);
285         P(cpu_load[2]);
286         P(cpu_load[3]);
287         P(cpu_load[4]);
288 #undef P
289 #undef PN
290
291 #ifdef CONFIG_SCHEDSTATS
292 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
293 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
294
295         P(yld_count);
296
297         P(sched_switch);
298         P(sched_count);
299         P(sched_goidle);
300 #ifdef CONFIG_SMP
301         P64(avg_idle);
302 #endif
303
304         P(ttwu_count);
305         P(ttwu_local);
306
307 #undef P
308 #undef P64
309 #endif
310         spin_lock_irqsave(&sched_debug_lock, flags);
311         print_cfs_stats(m, cpu);
312         print_rt_stats(m, cpu);
313
314         rcu_read_lock();
315         print_rq(m, rq, cpu);
316         rcu_read_unlock();
317         spin_unlock_irqrestore(&sched_debug_lock, flags);
318 }
319
320 static const char *sched_tunable_scaling_names[] = {
321         "none",
322         "logaritmic",
323         "linear"
324 };
325
326 static int sched_debug_show(struct seq_file *m, void *v)
327 {
328         u64 ktime, sched_clk, cpu_clk;
329         unsigned long flags;
330         int cpu;
331
332         local_irq_save(flags);
333         ktime = ktime_to_ns(ktime_get());
334         sched_clk = sched_clock();
335         cpu_clk = local_clock();
336         local_irq_restore(flags);
337
338         SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
339                 init_utsname()->release,
340                 (int)strcspn(init_utsname()->version, " "),
341                 init_utsname()->version);
342
343 #define P(x) \
344         SEQ_printf(m, "%-40s: %Ld\n", #x, (long long)(x))
345 #define PN(x) \
346         SEQ_printf(m, "%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
347         PN(ktime);
348         PN(sched_clk);
349         PN(cpu_clk);
350         P(jiffies);
351 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
352         P(sched_clock_stable);
353 #endif
354 #undef PN
355 #undef P
356
357         SEQ_printf(m, "\n");
358         SEQ_printf(m, "sysctl_sched\n");
359
360 #define P(x) \
361         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
362 #define PN(x) \
363         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
364         PN(sysctl_sched_latency);
365         PN(sysctl_sched_min_granularity);
366         PN(sysctl_sched_wakeup_granularity);
367         P(sysctl_sched_child_runs_first);
368         P(sysctl_sched_features);
369 #undef PN
370 #undef P
371
372         SEQ_printf(m, "  .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
373                 sysctl_sched_tunable_scaling,
374                 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
375
376         for_each_online_cpu(cpu)
377                 print_cpu(m, cpu);
378
379         SEQ_printf(m, "\n");
380
381         return 0;
382 }
383
384 static void sysrq_sched_debug_show(void)
385 {
386         sched_debug_show(NULL, NULL);
387 }
388
389 static int sched_debug_open(struct inode *inode, struct file *filp)
390 {
391         return single_open(filp, sched_debug_show, NULL);
392 }
393
394 static const struct file_operations sched_debug_fops = {
395         .open           = sched_debug_open,
396         .read           = seq_read,
397         .llseek         = seq_lseek,
398         .release        = single_release,
399 };
400
401 static int __init init_sched_debug_procfs(void)
402 {
403         struct proc_dir_entry *pe;
404
405         pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
406         if (!pe)
407                 return -ENOMEM;
408         return 0;
409 }
410
411 __initcall(init_sched_debug_procfs);
412
413 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
414 {
415         unsigned long nr_switches;
416
417         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
418                                                 get_nr_threads(p));
419         SEQ_printf(m,
420                 "---------------------------------------------------------\n");
421 #define __P(F) \
422         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
423 #define P(F) \
424         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
425 #define __PN(F) \
426         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
427 #define PN(F) \
428         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
429
430         PN(se.exec_start);
431         PN(se.vruntime);
432         PN(se.sum_exec_runtime);
433
434         nr_switches = p->nvcsw + p->nivcsw;
435
436 #ifdef CONFIG_SCHEDSTATS
437         PN(se.statistics.wait_start);
438         PN(se.statistics.sleep_start);
439         PN(se.statistics.block_start);
440         PN(se.statistics.sleep_max);
441         PN(se.statistics.block_max);
442         PN(se.statistics.exec_max);
443         PN(se.statistics.slice_max);
444         PN(se.statistics.wait_max);
445         PN(se.statistics.wait_sum);
446         P(se.statistics.wait_count);
447         PN(se.statistics.iowait_sum);
448         P(se.statistics.iowait_count);
449         P(se.nr_migrations);
450         P(se.statistics.nr_migrations_cold);
451         P(se.statistics.nr_failed_migrations_affine);
452         P(se.statistics.nr_failed_migrations_running);
453         P(se.statistics.nr_failed_migrations_hot);
454         P(se.statistics.nr_forced_migrations);
455         P(se.statistics.nr_wakeups);
456         P(se.statistics.nr_wakeups_sync);
457         P(se.statistics.nr_wakeups_migrate);
458         P(se.statistics.nr_wakeups_local);
459         P(se.statistics.nr_wakeups_remote);
460         P(se.statistics.nr_wakeups_affine);
461         P(se.statistics.nr_wakeups_affine_attempts);
462         P(se.statistics.nr_wakeups_passive);
463         P(se.statistics.nr_wakeups_idle);
464
465         {
466                 u64 avg_atom, avg_per_cpu;
467
468                 avg_atom = p->se.sum_exec_runtime;
469                 if (nr_switches)
470                         avg_atom = div64_ul(avg_atom, nr_switches);
471                 else
472                         avg_atom = -1LL;
473
474                 avg_per_cpu = p->se.sum_exec_runtime;
475                 if (p->se.nr_migrations) {
476                         avg_per_cpu = div64_u64(avg_per_cpu,
477                                                 p->se.nr_migrations);
478                 } else {
479                         avg_per_cpu = -1LL;
480                 }
481
482                 __PN(avg_atom);
483                 __PN(avg_per_cpu);
484         }
485 #endif
486         __P(nr_switches);
487         SEQ_printf(m, "%-35s:%21Ld\n",
488                    "nr_voluntary_switches", (long long)p->nvcsw);
489         SEQ_printf(m, "%-35s:%21Ld\n",
490                    "nr_involuntary_switches", (long long)p->nivcsw);
491
492         P(se.load.weight);
493         P(policy);
494         P(prio);
495 #undef PN
496 #undef __PN
497 #undef P
498 #undef __P
499
500         {
501                 unsigned int this_cpu = raw_smp_processor_id();
502                 u64 t0, t1;
503
504                 t0 = cpu_clock(this_cpu);
505                 t1 = cpu_clock(this_cpu);
506                 SEQ_printf(m, "%-35s:%21Ld\n",
507                            "clock-delta", (long long)(t1-t0));
508         }
509 }
510
511 void proc_sched_set_task(struct task_struct *p)
512 {
513 #ifdef CONFIG_SCHEDSTATS
514         memset(&p->se.statistics, 0, sizeof(p->se.statistics));
515 #endif
516 }