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43ae34cb IM |
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 | ||
ef83a571 IM |
31 | /* |
32 | * Ease the printing of nsec fields: | |
33 | */ | |
34 | static long long nsec_high(long long nsec) | |
35 | { | |
36 | if (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 | ||
46 | static unsigned long nsec_low(long long nsec) | |
47 | { | |
48 | if (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 | ||
43ae34cb | 56 | static void |
a48da48b | 57 | print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) |
43ae34cb IM |
58 | { |
59 | if (rq->curr == p) | |
60 | SEQ_printf(m, "R"); | |
61 | else | |
62 | SEQ_printf(m, " "); | |
63 | ||
ef83a571 | 64 | SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ", |
43ae34cb | 65 | p->comm, p->pid, |
ef83a571 | 66 | SPLIT_NS(p->se.vruntime), |
43ae34cb | 67 | (long long)(p->nvcsw + p->nivcsw), |
6f605d83 | 68 | p->prio); |
6cfb0d5d | 69 | #ifdef CONFIG_SCHEDSTATS |
c86da3a3 | 70 | SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n", |
ef83a571 IM |
71 | SPLIT_NS(p->se.vruntime), |
72 | SPLIT_NS(p->se.sum_exec_runtime), | |
73 | SPLIT_NS(p->se.sum_sleep_runtime)); | |
6cfb0d5d | 74 | #else |
ef83a571 IM |
75 | SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n", |
76 | 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L); | |
6cfb0d5d | 77 | #endif |
43ae34cb IM |
78 | } |
79 | ||
a48da48b | 80 | static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) |
43ae34cb IM |
81 | { |
82 | struct task_struct *g, *p; | |
83 | ||
84 | SEQ_printf(m, | |
85 | "\nrunnable tasks:\n" | |
c86da3a3 MG |
86 | " task PID tree-key switches prio" |
87 | " exec-runtime sum-exec sum-sleep\n" | |
1a75b94f | 88 | "------------------------------------------------------" |
c86da3a3 | 89 | "----------------------------------------------------\n"); |
43ae34cb IM |
90 | |
91 | read_lock_irq(&tasklist_lock); | |
92 | ||
93 | do_each_thread(g, p) { | |
94 | if (!p->se.on_rq || task_cpu(p) != rq_cpu) | |
95 | continue; | |
96 | ||
a48da48b | 97 | print_task(m, rq, p); |
43ae34cb IM |
98 | } while_each_thread(g, p); |
99 | ||
100 | read_unlock_irq(&tasklist_lock); | |
101 | } | |
102 | ||
5cef9eca | 103 | void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb | 104 | { |
86d9560c IM |
105 | s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, |
106 | spread, rq0_min_vruntime, spread0; | |
67e12eac IM |
107 | struct rq *rq = &per_cpu(runqueues, cpu); |
108 | struct sched_entity *last; | |
109 | unsigned long flags; | |
110 | ||
5167e75f | 111 | SEQ_printf(m, "\ncfs_rq\n"); |
43ae34cb | 112 | |
ef83a571 IM |
113 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", |
114 | SPLIT_NS(cfs_rq->exec_clock)); | |
67e12eac IM |
115 | |
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); | |
120 | if (last) | |
121 | max_vruntime = last->vruntime; | |
86d9560c IM |
122 | min_vruntime = rq->cfs.min_vruntime; |
123 | rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime; | |
67e12eac | 124 | spin_unlock_irqrestore(&rq->lock, flags); |
ef83a571 IM |
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)); | |
67e12eac | 131 | spread = max_vruntime - MIN_vruntime; |
ef83a571 IM |
132 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", |
133 | SPLIT_NS(spread)); | |
86d9560c | 134 | spread0 = min_vruntime - rq0_min_vruntime; |
ef83a571 IM |
135 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", |
136 | SPLIT_NS(spread0)); | |
545f3b18 SV |
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); | |
43ae34cb IM |
139 | } |
140 | ||
a48da48b | 141 | static void print_cpu(struct seq_file *m, int cpu) |
43ae34cb IM |
142 | { |
143 | struct rq *rq = &per_cpu(runqueues, cpu); | |
144 | ||
145 | #ifdef CONFIG_X86 | |
146 | { | |
147 | unsigned int freq = cpu_khz ? : 1; | |
148 | ||
149 | SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n", | |
150 | cpu, freq / 1000, (freq % 1000)); | |
151 | } | |
152 | #else | |
153 | SEQ_printf(m, "\ncpu#%d\n", cpu); | |
154 | #endif | |
155 | ||
156 | #define P(x) \ | |
157 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x)) | |
ef83a571 IM |
158 | #define PN(x) \ |
159 | SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x)) | |
43ae34cb IM |
160 | |
161 | P(nr_running); | |
162 | SEQ_printf(m, " .%-30s: %lu\n", "load", | |
495eca49 | 163 | rq->load.weight); |
43ae34cb IM |
164 | P(nr_switches); |
165 | P(nr_load_updates); | |
166 | P(nr_uninterruptible); | |
167 | SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies); | |
ef83a571 | 168 | PN(next_balance); |
43ae34cb | 169 | P(curr->pid); |
ef83a571 IM |
170 | PN(clock); |
171 | PN(idle_clock); | |
172 | PN(prev_clock_raw); | |
43ae34cb IM |
173 | P(clock_warps); |
174 | P(clock_overflows); | |
2aa44d05 | 175 | P(clock_deep_idle_events); |
ef83a571 | 176 | PN(clock_max_delta); |
43ae34cb IM |
177 | P(cpu_load[0]); |
178 | P(cpu_load[1]); | |
179 | P(cpu_load[2]); | |
180 | P(cpu_load[3]); | |
181 | P(cpu_load[4]); | |
182 | #undef P | |
ef83a571 | 183 | #undef PN |
43ae34cb | 184 | |
5cef9eca | 185 | print_cfs_stats(m, cpu); |
43ae34cb | 186 | |
a48da48b | 187 | print_rq(m, rq, cpu); |
43ae34cb IM |
188 | } |
189 | ||
190 | static int sched_debug_show(struct seq_file *m, void *v) | |
191 | { | |
192 | u64 now = ktime_to_ns(ktime_get()); | |
193 | int cpu; | |
194 | ||
6cfb0d5d | 195 | SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n", |
43ae34cb IM |
196 | init_utsname()->release, |
197 | (int)strcspn(init_utsname()->version, " "), | |
198 | init_utsname()->version); | |
199 | ||
ef83a571 | 200 | SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now)); |
43ae34cb IM |
201 | |
202 | for_each_online_cpu(cpu) | |
a48da48b | 203 | print_cpu(m, cpu); |
43ae34cb IM |
204 | |
205 | SEQ_printf(m, "\n"); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
f3373461 | 210 | static void sysrq_sched_debug_show(void) |
43ae34cb IM |
211 | { |
212 | sched_debug_show(NULL, NULL); | |
213 | } | |
214 | ||
215 | static int sched_debug_open(struct inode *inode, struct file *filp) | |
216 | { | |
217 | return single_open(filp, sched_debug_show, NULL); | |
218 | } | |
219 | ||
220 | static struct file_operations sched_debug_fops = { | |
221 | .open = sched_debug_open, | |
222 | .read = seq_read, | |
223 | .llseek = seq_lseek, | |
5ea473a1 | 224 | .release = single_release, |
43ae34cb IM |
225 | }; |
226 | ||
227 | static int __init init_sched_debug_procfs(void) | |
228 | { | |
229 | struct proc_dir_entry *pe; | |
230 | ||
231 | pe = create_proc_entry("sched_debug", 0644, NULL); | |
232 | if (!pe) | |
233 | return -ENOMEM; | |
234 | ||
235 | pe->proc_fops = &sched_debug_fops; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | __initcall(init_sched_debug_procfs); | |
241 | ||
242 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
243 | { | |
244 | unsigned long flags; | |
245 | int num_threads = 1; | |
246 | ||
247 | rcu_read_lock(); | |
248 | if (lock_task_sighand(p, &flags)) { | |
249 | num_threads = atomic_read(&p->signal->count); | |
250 | unlock_task_sighand(p, &flags); | |
251 | } | |
252 | rcu_read_unlock(); | |
253 | ||
254 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads); | |
255 | SEQ_printf(m, "----------------------------------------------\n"); | |
256 | #define P(F) \ | |
257 | SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F) | |
ef83a571 IM |
258 | #define PN(F) \ |
259 | SEQ_printf(m, "%-25s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F)) | |
43ae34cb | 260 | |
ef83a571 IM |
261 | PN(se.exec_start); |
262 | PN(se.vruntime); | |
263 | PN(se.sum_exec_runtime); | |
6cfb0d5d IM |
264 | |
265 | #ifdef CONFIG_SCHEDSTATS | |
ef83a571 IM |
266 | PN(se.wait_start); |
267 | PN(se.sleep_start); | |
268 | PN(se.block_start); | |
269 | PN(se.sleep_max); | |
270 | PN(se.block_max); | |
271 | PN(se.exec_max); | |
272 | PN(se.slice_max); | |
273 | PN(se.wait_max); | |
6cfb0d5d | 274 | #endif |
43ae34cb IM |
275 | SEQ_printf(m, "%-25s:%20Ld\n", |
276 | "nr_switches", (long long)(p->nvcsw + p->nivcsw)); | |
277 | P(se.load.weight); | |
278 | P(policy); | |
279 | P(prio); | |
280 | #undef P | |
ef83a571 | 281 | #undef PN |
43ae34cb IM |
282 | |
283 | { | |
284 | u64 t0, t1; | |
285 | ||
286 | t0 = sched_clock(); | |
287 | t1 = sched_clock(); | |
288 | SEQ_printf(m, "%-25s:%20Ld\n", | |
289 | "clock-delta", (long long)(t1-t0)); | |
290 | } | |
291 | } | |
292 | ||
293 | void proc_sched_set_task(struct task_struct *p) | |
294 | { | |
6cfb0d5d | 295 | #ifdef CONFIG_SCHEDSTATS |
a4b29ba2 IM |
296 | p->se.sleep_max = 0; |
297 | p->se.block_max = 0; | |
298 | p->se.exec_max = 0; | |
eba1ed4b | 299 | p->se.slice_max = 0; |
a4b29ba2 | 300 | p->se.wait_max = 0; |
6cfb0d5d | 301 | #endif |
a4b29ba2 | 302 | p->se.sum_exec_runtime = 0; |
2491b2b8 | 303 | p->se.prev_sum_exec_runtime = 0; |
43ae34cb | 304 | } |