Root/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/*
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->wait_start);
74    PN(se->sleep_start);
75    PN(se->block_start);
76    PN(se->sleep_max);
77    PN(se->block_max);
78    PN(se->exec_max);
79    PN(se->slice_max);
80    PN(se->wait_max);
81    PN(se->wait_sum);
82    P(se->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.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        cgroup_path(task_group(p)->css.cgroup, path, sizeof(path));
118        SEQ_printf(m, " %s", path);
119    }
120#endif
121    SEQ_printf(m, "\n");
122}
123
124static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
125{
126    struct task_struct *g, *p;
127    unsigned long flags;
128
129    SEQ_printf(m,
130    "\nrunnable tasks:\n"
131    " task PID tree-key switches prio"
132    " exec-runtime sum-exec sum-sleep\n"
133    "------------------------------------------------------"
134    "----------------------------------------------------\n");
135
136    read_lock_irqsave(&tasklist_lock, flags);
137
138    do_each_thread(g, p) {
139        if (!p->se.on_rq || task_cpu(p) != rq_cpu)
140            continue;
141
142        print_task(m, rq, p);
143    } while_each_thread(g, p);
144
145    read_unlock_irqrestore(&tasklist_lock, flags);
146}
147
148#if defined(CONFIG_CGROUP_SCHED) && \
149    (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
150static void task_group_path(struct task_group *tg, char *buf, int buflen)
151{
152    /* may be NULL if the underlying cgroup isn't fully-created yet */
153    if (!tg->css.cgroup) {
154        buf[0] = '\0';
155        return;
156    }
157    cgroup_path(tg->css.cgroup, buf, buflen);
158}
159#endif
160
161void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
162{
163    s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
164        spread, rq0_min_vruntime, spread0;
165    struct rq *rq = cpu_rq(cpu);
166    struct sched_entity *last;
167    unsigned long flags;
168
169#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
170    char path[128];
171    struct task_group *tg = cfs_rq->tg;
172
173    task_group_path(tg, path, sizeof(path));
174
175    SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
176#elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
177    {
178        uid_t uid = cfs_rq->tg->uid;
179        SEQ_printf(m, "\ncfs_rq[%d] for UID: %u\n", cpu, uid);
180    }
181#else
182    SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
183#endif
184    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
185            SPLIT_NS(cfs_rq->exec_clock));
186
187    raw_spin_lock_irqsave(&rq->lock, flags);
188    if (cfs_rq->rb_leftmost)
189        MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
190    last = __pick_last_entity(cfs_rq);
191    if (last)
192        max_vruntime = last->vruntime;
193    min_vruntime = cfs_rq->min_vruntime;
194    rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
195    raw_spin_unlock_irqrestore(&rq->lock, flags);
196    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
197            SPLIT_NS(MIN_vruntime));
198    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
199            SPLIT_NS(min_vruntime));
200    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
201            SPLIT_NS(max_vruntime));
202    spread = max_vruntime - MIN_vruntime;
203    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
204            SPLIT_NS(spread));
205    spread0 = min_vruntime - rq0_min_vruntime;
206    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
207            SPLIT_NS(spread0));
208    SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
209    SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
210
211    SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over",
212            cfs_rq->nr_spread_over);
213#ifdef CONFIG_FAIR_GROUP_SCHED
214#ifdef CONFIG_SMP
215    SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares);
216#endif
217    print_cfs_group_stats(m, cpu, cfs_rq->tg);
218#endif
219}
220
221void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
222{
223#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
224    char path[128];
225    struct task_group *tg = rt_rq->tg;
226
227    task_group_path(tg, path, sizeof(path));
228
229    SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
230#else
231    SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
232#endif
233
234
235#define P(x) \
236    SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
237#define PN(x) \
238    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
239
240    P(rt_nr_running);
241    P(rt_throttled);
242    PN(rt_time);
243    PN(rt_runtime);
244
245#undef PN
246#undef P
247}
248
249static void print_cpu(struct seq_file *m, int cpu)
250{
251    struct rq *rq = cpu_rq(cpu);
252
253#ifdef CONFIG_X86
254    {
255        unsigned int freq = cpu_khz ? : 1;
256
257        SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
258               cpu, freq / 1000, (freq % 1000));
259    }
260#else
261    SEQ_printf(m, "\ncpu#%d\n", cpu);
262#endif
263
264#define P(x) \
265    SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
266#define PN(x) \
267    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
268
269    P(nr_running);
270    SEQ_printf(m, " .%-30s: %lu\n", "load",
271           rq->load.weight);
272    P(nr_switches);
273    P(nr_load_updates);
274    P(nr_uninterruptible);
275    PN(next_balance);
276    P(curr->pid);
277    PN(clock);
278    P(cpu_load[0]);
279    P(cpu_load[1]);
280    P(cpu_load[2]);
281    P(cpu_load[3]);
282    P(cpu_load[4]);
283#undef P
284#undef PN
285
286#ifdef CONFIG_SCHEDSTATS
287#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, rq->n);
288#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
289
290    P(yld_count);
291
292    P(sched_switch);
293    P(sched_count);
294    P(sched_goidle);
295#ifdef CONFIG_SMP
296    P64(avg_idle);
297#endif
298
299    P(ttwu_count);
300    P(ttwu_local);
301
302    P(bkl_count);
303
304#undef P
305#endif
306    print_cfs_stats(m, cpu);
307    print_rt_stats(m, cpu);
308
309    print_rq(m, rq, cpu);
310}
311
312static const char *sched_tunable_scaling_names[] = {
313    "none",
314    "logaritmic",
315    "linear"
316};
317
318static int sched_debug_show(struct seq_file *m, void *v)
319{
320    u64 now = ktime_to_ns(ktime_get());
321    int cpu;
322
323    SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n",
324        init_utsname()->release,
325        (int)strcspn(init_utsname()->version, " "),
326        init_utsname()->version);
327
328    SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now));
329
330#define P(x) \
331    SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
332#define PN(x) \
333    SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
334    P(jiffies);
335    PN(sysctl_sched_latency);
336    PN(sysctl_sched_min_granularity);
337    PN(sysctl_sched_wakeup_granularity);
338    PN(sysctl_sched_child_runs_first);
339    P(sysctl_sched_features);
340#undef PN
341#undef P
342
343    SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling",
344        sysctl_sched_tunable_scaling,
345        sched_tunable_scaling_names[sysctl_sched_tunable_scaling]);
346
347    for_each_online_cpu(cpu)
348        print_cpu(m, cpu);
349
350    SEQ_printf(m, "\n");
351
352    return 0;
353}
354
355static void sysrq_sched_debug_show(void)
356{
357    sched_debug_show(NULL, NULL);
358}
359
360static int sched_debug_open(struct inode *inode, struct file *filp)
361{
362    return single_open(filp, sched_debug_show, NULL);
363}
364
365static const struct file_operations sched_debug_fops = {
366    .open = sched_debug_open,
367    .read = seq_read,
368    .llseek = seq_lseek,
369    .release = single_release,
370};
371
372static int __init init_sched_debug_procfs(void)
373{
374    struct proc_dir_entry *pe;
375
376    pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
377    if (!pe)
378        return -ENOMEM;
379    return 0;
380}
381
382__initcall(init_sched_debug_procfs);
383
384void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
385{
386    unsigned long nr_switches;
387    unsigned long flags;
388    int num_threads = 1;
389
390    if (lock_task_sighand(p, &flags)) {
391        num_threads = atomic_read(&p->signal->count);
392        unlock_task_sighand(p, &flags);
393    }
394
395    SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
396    SEQ_printf(m,
397        "---------------------------------------------------------\n");
398#define __P(F) \
399    SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
400#define P(F) \
401    SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
402#define __PN(F) \
403    SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
404#define PN(F) \
405    SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
406
407    PN(se.exec_start);
408    PN(se.vruntime);
409    PN(se.sum_exec_runtime);
410    PN(se.avg_overlap);
411    PN(se.avg_wakeup);
412
413    nr_switches = p->nvcsw + p->nivcsw;
414
415#ifdef CONFIG_SCHEDSTATS
416    PN(se.wait_start);
417    PN(se.sleep_start);
418    PN(se.block_start);
419    PN(se.sleep_max);
420    PN(se.block_max);
421    PN(se.exec_max);
422    PN(se.slice_max);
423    PN(se.wait_max);
424    PN(se.wait_sum);
425    P(se.wait_count);
426    PN(se.iowait_sum);
427    P(se.iowait_count);
428    P(sched_info.bkl_count);
429    P(se.nr_migrations);
430    P(se.nr_migrations_cold);
431    P(se.nr_failed_migrations_affine);
432    P(se.nr_failed_migrations_running);
433    P(se.nr_failed_migrations_hot);
434    P(se.nr_forced_migrations);
435    P(se.nr_wakeups);
436    P(se.nr_wakeups_sync);
437    P(se.nr_wakeups_migrate);
438    P(se.nr_wakeups_local);
439    P(se.nr_wakeups_remote);
440    P(se.nr_wakeups_affine);
441    P(se.nr_wakeups_affine_attempts);
442    P(se.nr_wakeups_passive);
443    P(se.nr_wakeups_idle);
444
445    {
446        u64 avg_atom, avg_per_cpu;
447
448        avg_atom = p->se.sum_exec_runtime;
449        if (nr_switches)
450            do_div(avg_atom, nr_switches);
451        else
452            avg_atom = -1LL;
453
454        avg_per_cpu = p->se.sum_exec_runtime;
455        if (p->se.nr_migrations) {
456            avg_per_cpu = div64_u64(avg_per_cpu,
457                        p->se.nr_migrations);
458        } else {
459            avg_per_cpu = -1LL;
460        }
461
462        __PN(avg_atom);
463        __PN(avg_per_cpu);
464    }
465#endif
466    __P(nr_switches);
467    SEQ_printf(m, "%-35s:%21Ld\n",
468           "nr_voluntary_switches", (long long)p->nvcsw);
469    SEQ_printf(m, "%-35s:%21Ld\n",
470           "nr_involuntary_switches", (long long)p->nivcsw);
471
472    P(se.load.weight);
473    P(policy);
474    P(prio);
475#undef PN
476#undef __PN
477#undef P
478#undef __P
479
480    {
481        unsigned int this_cpu = raw_smp_processor_id();
482        u64 t0, t1;
483
484        t0 = cpu_clock(this_cpu);
485        t1 = cpu_clock(this_cpu);
486        SEQ_printf(m, "%-35s:%21Ld\n",
487               "clock-delta", (long long)(t1-t0));
488    }
489}
490
491void proc_sched_set_task(struct task_struct *p)
492{
493#ifdef CONFIG_SCHEDSTATS
494    p->se.wait_max = 0;
495    p->se.wait_sum = 0;
496    p->se.wait_count = 0;
497    p->se.iowait_sum = 0;
498    p->se.iowait_count = 0;
499    p->se.sleep_max = 0;
500    p->se.sum_sleep_runtime = 0;
501    p->se.block_max = 0;
502    p->se.exec_max = 0;
503    p->se.slice_max = 0;
504    p->se.nr_migrations = 0;
505    p->se.nr_migrations_cold = 0;
506    p->se.nr_failed_migrations_affine = 0;
507    p->se.nr_failed_migrations_running = 0;
508    p->se.nr_failed_migrations_hot = 0;
509    p->se.nr_forced_migrations = 0;
510    p->se.nr_wakeups = 0;
511    p->se.nr_wakeups_sync = 0;
512    p->se.nr_wakeups_migrate = 0;
513    p->se.nr_wakeups_local = 0;
514    p->se.nr_wakeups_remote = 0;
515    p->se.nr_wakeups_affine = 0;
516    p->se.nr_wakeups_affine_attempts = 0;
517    p->se.nr_wakeups_passive = 0;
518    p->se.nr_wakeups_idle = 0;
519    p->sched_info.bkl_count = 0;
520#endif
521}
522

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