projects/linux·blob v2.6.36-rc1 · refs

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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/*
20 * This allows printing both to /proc/sched_debug and
21 * to the console
22 */
23#define SEQ_printf(m, x...) \
24 do { \
25 if (m) \
26 seq_printf(m, x); \
27 else \
28 printk(x); \
29 } while (0)
30
31/*
32 * Ease the printing of nsec fields:
33 */
34static long long nsec_high(unsigned long long nsec)
35{
36 if ((long long)nsec < 0) {
37 nsec = -nsec;
38 do_div(nsec, 1000000);
39 return -nsec;
40 }
41 do_div(nsec, 1000000);
42
43 return nsec;
44}
45
46static unsigned long nsec_low(unsigned long long nsec)
47{
48 if ((long long)nsec < 0)
49 nsec = -nsec;
50
51 return do_div(nsec, 1000000);
52}
53
54#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
55
56#ifdef CONFIG_FAIR_GROUP_SCHED
57static void print_cfs_group_stats(struct seq_file *m, int cpu,
58 struct task_group *tg)
59{
60 struct sched_entity *se = tg->se[cpu];
61 if (!se)
62 return;
63
64#define P(F) \
65 SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
66#define PN(F) \
67 SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
68
69 PN(se->exec_start);
70 PN(se->vruntime);
71 PN(se->sum_exec_runtime);
72#ifdef CONFIG_SCHEDSTATS
73 PN(se->statistics.wait_start);
74 PN(se->statistics.sleep_start);
75 PN(se->statistics.block_start);
76 PN(se->statistics.sleep_max);
77 PN(se->statistics.block_max);
78 PN(se->statistics.exec_max);
79 PN(se->statistics.slice_max);
80 PN(se->statistics.wait_max);
81 PN(se->statistics.wait_sum);
82 P(se->statistics.wait_count);
83#endif
84 P(se->load.weight);
85#undef PN
86#undef P
87}
88#endif
89
90static void
91print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
92{
93 if (rq->curr == p)
94 SEQ_printf(m, "R");
95 else
96 SEQ_printf(m, " ");
97
98 SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
99 p->comm, p->pid,
100 SPLIT_NS(p->se.vruntime),
101 (long long)(p->nvcsw + p->nivcsw),
102 p->prio);
103#ifdef CONFIG_SCHEDSTATS
104 SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
105 SPLIT_NS(p->se.vruntime),
106 SPLIT_NS(p->se.sum_exec_runtime),
107 SPLIT_NS(p->se.statistics.sum_sleep_runtime));
108#else
109 SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld",
110 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
111#endif
112
113#ifdef CONFIG_CGROUP_SCHED
114 {
115 char path[64];
116
117 rcu_read_lock();
118 cgroup_path(task_group(p)->css.cgroup, path, sizeof(path));
119 rcu_read_unlock();
120 SEQ_printf(m, " %s", path);
121 }
122#endif
123 SEQ_printf(m, "\n");
124}
125
126static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
127{
128 struct task_struct *g, *p;
129 unsigned long flags;
130
131 SEQ_printf(m,
132 "\nrunnable tasks:\n"
133 " task PID tree-key switches prio"
134 " exec-runtime sum-exec sum-sleep\n"
135 "------------------------------------------------------"
136 "----------------------------------------------------\n");
137
138 read_lock_irqsave(&tasklist_lock, flags);
139
140 do_each_thread(g, p) {
141 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
142 continue;
143
144 print_task(m, rq, p);
145 } while_each_thread(g, p);
146
147 read_unlock_irqrestore(&tasklist_lock, flags);
148}
149
150#if defined(CONFIG_CGROUP_SCHED) && \
151 (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
152static void task_group_path(struct task_group *tg, char *buf, int buflen)
153{
154 /* may be NULL if the underlying cgroup isn't fully-created yet */
155 if (!tg->css.cgroup) {
156 buf[0] = '\0';
157 return;
158 }
159 cgroup_path(tg->css.cgroup, buf, buflen);
160}
161#endif
162
163void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
164{
165 s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
166 spread, rq0_min_vruntime, spread0;
167 struct rq *rq = cpu_rq(cpu);
168 struct sched_entity *last;
169 unsigned long flags;
170
171#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
172 char path[128];
173 struct task_group *tg = cfs_rq->tg;
174
175 task_group_path(tg, path, sizeof(path));
176
177 SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
178#else
179 SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
180#endif
181 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
182 SPLIT_NS(cfs_rq->exec_clock));
183
184 raw_spin_lock_irqsave(&rq->lock, flags);
185 if (cfs_rq->rb_leftmost)
186 MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
187 last = __pick_last_entity(cfs_rq);
188 if (last)
189 max_vruntime = last->vruntime;
190 min_vruntime = cfs_rq->min_vruntime;
191 rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
192 raw_spin_unlock_irqrestore(&rq->lock, flags);
193 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
194 SPLIT_NS(MIN_vruntime));
195 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
196 SPLIT_NS(min_vruntime));
197 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
198 SPLIT_NS(max_vruntime));
199 spread = max_vruntime - MIN_vruntime;
200 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
201 SPLIT_NS(spread));
202 spread0 = min_vruntime - rq0_min_vruntime;
203 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
204 SPLIT_NS(spread0));
205 SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
206 SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
207
208 SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
209 cfs_rq->nr_spread_over);
210#ifdef CONFIG_FAIR_GROUP_SCHED
211#ifdef CONFIG_SMP
212 SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares);
213#endif
214 print_cfs_group_stats(m, cpu, cfs_rq->tg);
215#endif
216}
217
218void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
219{
220#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
221 char path[128];
222 struct task_group *tg = rt_rq->tg;
223
224 task_group_path(tg, path, sizeof(path));
225
226 SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
227#else
228 SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
229#endif
230
231
232#define P(x) \
233 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
234#define PN(x) \
235 SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
236
237 P(rt_nr_running);
238 P(rt_throttled);
239 PN(rt_time);
240 PN(rt_runtime);
241
242#undef PN
243#undef P
244}
245
246static void print_cpu(struct seq_file *m, int cpu)
247{
248 struct rq *rq = cpu_rq(cpu);
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 P(bkl_count);
300
301#undef P
302#endif
303 print_cfs_stats(m, cpu);
304 print_rt_stats(m, cpu);
305
306 print_rq(m, rq, cpu);
307}
308
309static const char *sched_tunable_scaling_names[] = {
310 "none",
311 "logaritmic",
312 "linear"
313};
314
315static int sched_debug_show(struct seq_file *m, void *v)
316{
317 u64 now = ktime_to_ns(ktime_get());
318 int cpu;
319
320 SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n",
321 init_utsname()->release,
322 (int)strcspn(init_utsname()->version, " "),
323 init_utsname()->version);
324
325 SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now));
326
327#define P(x) \
328 SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
329#define PN(x) \
330 SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
331 P(jiffies);
332 PN(sysctl_sched_latency);
333 PN(sysctl_sched_min_granularity);
334 PN(sysctl_sched_wakeup_granularity);
335 P(sysctl_sched_child_runs_first);
336 P(sysctl_sched_features);
337#undef PN
338#undef P
339
340 SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
341 sysctl_sched_tunable_scaling,
342 sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
343
344 for_each_online_cpu(cpu)
345 print_cpu(m, cpu);
346
347 SEQ_printf(m, "\n");
348
349 return 0;
350}
351
352static void sysrq_sched_debug_show(void)
353{
354 sched_debug_show(NULL, NULL);
355}
356
357static int sched_debug_open(struct inode *inode, struct file *filp)
358{
359 return single_open(filp, sched_debug_show, NULL);
360}
361
362static const struct file_operations sched_debug_fops = {
363 .open = sched_debug_open,
364 .read = seq_read,
365 .llseek = seq_lseek,
366 .release = single_release,
367};
368
369static int __init init_sched_debug_procfs(void)
370{
371 struct proc_dir_entry *pe;
372
373 pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
374 if (!pe)
375 return -ENOMEM;
376 return 0;
377}
378
379__initcall(init_sched_debug_procfs);
380
381void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
382{
383 unsigned long nr_switches;
384
385 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
386 get_nr_threads(p));
387 SEQ_printf(m,
388 "---------------------------------------------------------\n");
389#define __P(F) \
390 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
391#define P(F) \
392 SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
393#define __PN(F) \
394 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
395#define PN(F) \
396 SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
397
398 PN(se.exec_start);
399 PN(se.vruntime);
400 PN(se.sum_exec_runtime);
401
402 nr_switches = p->nvcsw + p->nivcsw;
403
404#ifdef CONFIG_SCHEDSTATS
405 PN(se.statistics.wait_start);
406 PN(se.statistics.sleep_start);
407 PN(se.statistics.block_start);
408 PN(se.statistics.sleep_max);
409 PN(se.statistics.block_max);
410 PN(se.statistics.exec_max);
411 PN(se.statistics.slice_max);
412 PN(se.statistics.wait_max);
413 PN(se.statistics.wait_sum);
414 P(se.statistics.wait_count);
415 PN(se.statistics.iowait_sum);
416 P(se.statistics.iowait_count);
417 P(sched_info.bkl_count);
418 P(se.nr_migrations);
419 P(se.statistics.nr_migrations_cold);
420 P(se.statistics.nr_failed_migrations_affine);
421 P(se.statistics.nr_failed_migrations_running);
422 P(se.statistics.nr_failed_migrations_hot);
423 P(se.statistics.nr_forced_migrations);
424 P(se.statistics.nr_wakeups);
425 P(se.statistics.nr_wakeups_sync);
426 P(se.statistics.nr_wakeups_migrate);
427 P(se.statistics.nr_wakeups_local);
428 P(se.statistics.nr_wakeups_remote);
429 P(se.statistics.nr_wakeups_affine);
430 P(se.statistics.nr_wakeups_affine_attempts);
431 P(se.statistics.nr_wakeups_passive);
432 P(se.statistics.nr_wakeups_idle);
433
434 {
435 u64 avg_atom, avg_per_cpu;
436
437 avg_atom = p->se.sum_exec_runtime;
438 if (nr_switches)
439 do_div(avg_atom, nr_switches);
440 else
441 avg_atom = -1LL;
442
443 avg_per_cpu = p->se.sum_exec_runtime;
444 if (p->se.nr_migrations) {
445 avg_per_cpu = div64_u64(avg_per_cpu,
446 p->se.nr_migrations);
447 } else {
448 avg_per_cpu = -1LL;
449 }
450
451 __PN(avg_atom);
452 __PN(avg_per_cpu);
453 }
454#endif
455 __P(nr_switches);
456 SEQ_printf(m, "%-35s:%21Ld\n",
457 "nr_voluntary_switches", (long long)p->nvcsw);
458 SEQ_printf(m, "%-35s:%21Ld\n",
459 "nr_involuntary_switches", (long long)p->nivcsw);
460
461 P(se.load.weight);
462 P(policy);
463 P(prio);
464#undef PN
465#undef __PN
466#undef P
467#undef __P
468
469 {
470 unsigned int this_cpu = raw_smp_processor_id();
471 u64 t0, t1;
472
473 t0 = cpu_clock(this_cpu);
474 t1 = cpu_clock(this_cpu);
475 SEQ_printf(m, "%-35s:%21Ld\n",
476 "clock-delta", (long long)(t1-t0));
477 }
478}
479
480void proc_sched_set_task(struct task_struct *p)
481{
482#ifdef CONFIG_SCHEDSTATS
483 memset(&p->se.statistics, 0, sizeof(p->se.statistics));
484#endif
485}