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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 | ||
31 | static void | |
a48da48b | 32 | print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) |
43ae34cb IM |
33 | { |
34 | if (rq->curr == p) | |
35 | SEQ_printf(m, "R"); | |
36 | else | |
37 | SEQ_printf(m, " "); | |
38 | ||
6f605d83 | 39 | SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d ", |
43ae34cb IM |
40 | p->comm, p->pid, |
41 | (long long)p->se.fair_key, | |
42 | (long long)(p->se.fair_key - rq->cfs.fair_clock), | |
43 | (long long)p->se.wait_runtime, | |
44 | (long long)(p->nvcsw + p->nivcsw), | |
6f605d83 | 45 | p->prio); |
6cfb0d5d | 46 | #ifdef CONFIG_SCHEDSTATS |
6f605d83 | 47 | SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n", |
43ae34cb IM |
48 | (long long)p->se.sum_exec_runtime, |
49 | (long long)p->se.sum_wait_runtime, | |
50 | (long long)p->se.sum_sleep_runtime, | |
51 | (long long)p->se.wait_runtime_overruns, | |
6f605d83 | 52 | (long long)p->se.wait_runtime_underruns); |
6cfb0d5d | 53 | #else |
6f605d83 AV |
54 | SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n", |
55 | 0LL, 0LL, 0LL, 0LL, 0LL); | |
6cfb0d5d | 56 | #endif |
43ae34cb IM |
57 | } |
58 | ||
a48da48b | 59 | static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) |
43ae34cb IM |
60 | { |
61 | struct task_struct *g, *p; | |
62 | ||
63 | SEQ_printf(m, | |
64 | "\nrunnable tasks:\n" | |
65 | " task PID tree-key delta waiting" | |
66 | " switches prio" | |
67 | " sum-exec sum-wait sum-sleep" | |
68 | " wait-overrun wait-underrun\n" | |
69 | "------------------------------------------------------------------" | |
70 | "----------------" | |
71 | "------------------------------------------------" | |
72 | "--------------------------------\n"); | |
73 | ||
74 | read_lock_irq(&tasklist_lock); | |
75 | ||
76 | do_each_thread(g, p) { | |
77 | if (!p->se.on_rq || task_cpu(p) != rq_cpu) | |
78 | continue; | |
79 | ||
a48da48b | 80 | print_task(m, rq, p); |
43ae34cb IM |
81 | } while_each_thread(g, p); |
82 | ||
83 | read_unlock_irq(&tasklist_lock); | |
84 | } | |
85 | ||
86 | static void | |
87 | print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) | |
88 | { | |
89 | s64 wait_runtime_rq_sum = 0; | |
90 | struct task_struct *p; | |
91 | struct rb_node *curr; | |
92 | unsigned long flags; | |
93 | struct rq *rq = &per_cpu(runqueues, cpu); | |
94 | ||
95 | spin_lock_irqsave(&rq->lock, flags); | |
96 | curr = first_fair(cfs_rq); | |
97 | while (curr) { | |
98 | p = rb_entry(curr, struct task_struct, se.run_node); | |
99 | wait_runtime_rq_sum += p->se.wait_runtime; | |
100 | ||
101 | curr = rb_next(curr); | |
102 | } | |
103 | spin_unlock_irqrestore(&rq->lock, flags); | |
104 | ||
105 | SEQ_printf(m, " .%-30s: %Ld\n", "wait_runtime_rq_sum", | |
106 | (long long)wait_runtime_rq_sum); | |
107 | } | |
108 | ||
5cef9eca | 109 | void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb | 110 | { |
5167e75f | 111 | SEQ_printf(m, "\ncfs_rq\n"); |
43ae34cb IM |
112 | |
113 | #define P(x) \ | |
114 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x)) | |
115 | ||
116 | P(fair_clock); | |
117 | P(exec_clock); | |
118 | P(wait_runtime); | |
119 | P(wait_runtime_overruns); | |
120 | P(wait_runtime_underruns); | |
121 | P(sleeper_bonus); | |
122 | #undef P | |
123 | ||
124 | print_cfs_rq_runtime_sum(m, cpu, cfs_rq); | |
125 | } | |
126 | ||
a48da48b | 127 | static void print_cpu(struct seq_file *m, int cpu) |
43ae34cb IM |
128 | { |
129 | struct rq *rq = &per_cpu(runqueues, cpu); | |
130 | ||
131 | #ifdef CONFIG_X86 | |
132 | { | |
133 | unsigned int freq = cpu_khz ? : 1; | |
134 | ||
135 | SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n", | |
136 | cpu, freq / 1000, (freq % 1000)); | |
137 | } | |
138 | #else | |
139 | SEQ_printf(m, "\ncpu#%d\n", cpu); | |
140 | #endif | |
141 | ||
142 | #define P(x) \ | |
143 | SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x)) | |
144 | ||
145 | P(nr_running); | |
146 | SEQ_printf(m, " .%-30s: %lu\n", "load", | |
147 | rq->ls.load.weight); | |
148 | P(ls.delta_fair); | |
149 | P(ls.delta_exec); | |
150 | P(nr_switches); | |
151 | P(nr_load_updates); | |
152 | P(nr_uninterruptible); | |
153 | SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies); | |
154 | P(next_balance); | |
155 | P(curr->pid); | |
156 | P(clock); | |
2aa44d05 | 157 | P(idle_clock); |
43ae34cb IM |
158 | P(prev_clock_raw); |
159 | P(clock_warps); | |
160 | P(clock_overflows); | |
2aa44d05 | 161 | P(clock_deep_idle_events); |
43ae34cb IM |
162 | P(clock_max_delta); |
163 | P(cpu_load[0]); | |
164 | P(cpu_load[1]); | |
165 | P(cpu_load[2]); | |
166 | P(cpu_load[3]); | |
167 | P(cpu_load[4]); | |
168 | #undef P | |
169 | ||
5cef9eca | 170 | print_cfs_stats(m, cpu); |
43ae34cb | 171 | |
a48da48b | 172 | print_rq(m, rq, cpu); |
43ae34cb IM |
173 | } |
174 | ||
175 | static int sched_debug_show(struct seq_file *m, void *v) | |
176 | { | |
177 | u64 now = ktime_to_ns(ktime_get()); | |
178 | int cpu; | |
179 | ||
6cfb0d5d | 180 | SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n", |
43ae34cb IM |
181 | init_utsname()->release, |
182 | (int)strcspn(init_utsname()->version, " "), | |
183 | init_utsname()->version); | |
184 | ||
185 | SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now); | |
186 | ||
187 | for_each_online_cpu(cpu) | |
a48da48b | 188 | print_cpu(m, cpu); |
43ae34cb IM |
189 | |
190 | SEQ_printf(m, "\n"); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
f3373461 | 195 | static void sysrq_sched_debug_show(void) |
43ae34cb IM |
196 | { |
197 | sched_debug_show(NULL, NULL); | |
198 | } | |
199 | ||
200 | static int sched_debug_open(struct inode *inode, struct file *filp) | |
201 | { | |
202 | return single_open(filp, sched_debug_show, NULL); | |
203 | } | |
204 | ||
205 | static struct file_operations sched_debug_fops = { | |
206 | .open = sched_debug_open, | |
207 | .read = seq_read, | |
208 | .llseek = seq_lseek, | |
5ea473a1 | 209 | .release = single_release, |
43ae34cb IM |
210 | }; |
211 | ||
212 | static int __init init_sched_debug_procfs(void) | |
213 | { | |
214 | struct proc_dir_entry *pe; | |
215 | ||
216 | pe = create_proc_entry("sched_debug", 0644, NULL); | |
217 | if (!pe) | |
218 | return -ENOMEM; | |
219 | ||
220 | pe->proc_fops = &sched_debug_fops; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | __initcall(init_sched_debug_procfs); | |
226 | ||
227 | void proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
228 | { | |
229 | unsigned long flags; | |
230 | int num_threads = 1; | |
231 | ||
232 | rcu_read_lock(); | |
233 | if (lock_task_sighand(p, &flags)) { | |
234 | num_threads = atomic_read(&p->signal->count); | |
235 | unlock_task_sighand(p, &flags); | |
236 | } | |
237 | rcu_read_unlock(); | |
238 | ||
239 | SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads); | |
240 | SEQ_printf(m, "----------------------------------------------\n"); | |
241 | #define P(F) \ | |
242 | SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F) | |
243 | ||
6cfb0d5d | 244 | P(se.wait_runtime); |
43ae34cb IM |
245 | P(se.wait_start_fair); |
246 | P(se.exec_start); | |
43ae34cb | 247 | P(se.sleep_start_fair); |
6cfb0d5d IM |
248 | P(se.sum_exec_runtime); |
249 | ||
250 | #ifdef CONFIG_SCHEDSTATS | |
251 | P(se.wait_start); | |
252 | P(se.sleep_start); | |
43ae34cb IM |
253 | P(se.block_start); |
254 | P(se.sleep_max); | |
255 | P(se.block_max); | |
256 | P(se.exec_max); | |
257 | P(se.wait_max); | |
43ae34cb IM |
258 | P(se.wait_runtime_overruns); |
259 | P(se.wait_runtime_underruns); | |
260 | P(se.sum_wait_runtime); | |
6cfb0d5d | 261 | #endif |
43ae34cb IM |
262 | SEQ_printf(m, "%-25s:%20Ld\n", |
263 | "nr_switches", (long long)(p->nvcsw + p->nivcsw)); | |
264 | P(se.load.weight); | |
265 | P(policy); | |
266 | P(prio); | |
267 | #undef P | |
268 | ||
269 | { | |
270 | u64 t0, t1; | |
271 | ||
272 | t0 = sched_clock(); | |
273 | t1 = sched_clock(); | |
274 | SEQ_printf(m, "%-25s:%20Ld\n", | |
275 | "clock-delta", (long long)(t1-t0)); | |
276 | } | |
277 | } | |
278 | ||
279 | void proc_sched_set_task(struct task_struct *p) | |
280 | { | |
6cfb0d5d | 281 | #ifdef CONFIG_SCHEDSTATS |
43ae34cb IM |
282 | p->se.sleep_max = p->se.block_max = p->se.exec_max = p->se.wait_max = 0; |
283 | p->se.wait_runtime_overruns = p->se.wait_runtime_underruns = 0; | |
6cfb0d5d | 284 | #endif |
43ae34cb IM |
285 | p->se.sum_exec_runtime = 0; |
286 | } |