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authorIngo Molnar <mingo@elte.hu>2007-07-09 12:52:00 -0400
committerIngo Molnar <mingo@elte.hu>2007-07-09 12:52:00 -0400
commit43ae34cb4cd650d1eb4460a8253a8e747ba052ac (patch)
tree51f1b6a8331dea95d8d560c2c27f4abdad1d759c /kernel/sched_debug.c
parent77e54a1f88a1cb0746c7694fa40052bd02df1123 (diff)
sched: scheduler debugging, core
scheduler debugging core: implement /proc/sched_debug and /proc/<PID>/sched files for scheduler debugging. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_debug.c')
-rw-r--r--kernel/sched_debug.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
new file mode 100644
index 000000000000..1baf87cceb7c
--- /dev/null
+++ b/kernel/sched_debug.c
@@ -0,0 +1,275 @@
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
31static void
32print_task(struct seq_file *m, struct rq *rq, struct task_struct *p, u64 now)
33{
34 if (rq->curr == p)
35 SEQ_printf(m, "R");
36 else
37 SEQ_printf(m, " ");
38
39 SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d "
40 "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
41 p->comm, p->pid,
42 (long long)p->se.fair_key,
43 (long long)(p->se.fair_key - rq->cfs.fair_clock),
44 (long long)p->se.wait_runtime,
45 (long long)(p->nvcsw + p->nivcsw),
46 p->prio,
47 (long long)p->se.sum_exec_runtime,
48 (long long)p->se.sum_wait_runtime,
49 (long long)p->se.sum_sleep_runtime,
50 (long long)p->se.wait_runtime_overruns,
51 (long long)p->se.wait_runtime_underruns);
52}
53
54static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu, u64 now)
55{
56 struct task_struct *g, *p;
57
58 SEQ_printf(m,
59 "\nrunnable tasks:\n"
60 " task PID tree-key delta waiting"
61 " switches prio"
62 " sum-exec sum-wait sum-sleep"
63 " wait-overrun wait-underrun\n"
64 "------------------------------------------------------------------"
65 "----------------"
66 "------------------------------------------------"
67 "--------------------------------\n");
68
69 read_lock_irq(&tasklist_lock);
70
71 do_each_thread(g, p) {
72 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
73 continue;
74
75 print_task(m, rq, p, now);
76 } while_each_thread(g, p);
77
78 read_unlock_irq(&tasklist_lock);
79}
80
81static void
82print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
83{
84 s64 wait_runtime_rq_sum = 0;
85 struct task_struct *p;
86 struct rb_node *curr;
87 unsigned long flags;
88 struct rq *rq = &per_cpu(runqueues, cpu);
89
90 spin_lock_irqsave(&rq->lock, flags);
91 curr = first_fair(cfs_rq);
92 while (curr) {
93 p = rb_entry(curr, struct task_struct, se.run_node);
94 wait_runtime_rq_sum += p->se.wait_runtime;
95
96 curr = rb_next(curr);
97 }
98 spin_unlock_irqrestore(&rq->lock, flags);
99
100 SEQ_printf(m, " .%-30s: %Ld\n", "wait_runtime_rq_sum",
101 (long long)wait_runtime_rq_sum);
102}
103
104void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now)
105{
106 SEQ_printf(m, "\ncfs_rq %p\n", cfs_rq);
107
108#define P(x) \
109 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
110
111 P(fair_clock);
112 P(exec_clock);
113 P(wait_runtime);
114 P(wait_runtime_overruns);
115 P(wait_runtime_underruns);
116 P(sleeper_bonus);
117#undef P
118
119 print_cfs_rq_runtime_sum(m, cpu, cfs_rq);
120}
121
122static void print_cpu(struct seq_file *m, int cpu, u64 now)
123{
124 struct rq *rq = &per_cpu(runqueues, cpu);
125
126#ifdef CONFIG_X86
127 {
128 unsigned int freq = cpu_khz ? : 1;
129
130 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
131 cpu, freq / 1000, (freq % 1000));
132 }
133#else
134 SEQ_printf(m, "\ncpu#%d\n", cpu);
135#endif
136
137#define P(x) \
138 SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
139
140 P(nr_running);
141 SEQ_printf(m, " .%-30s: %lu\n", "load",
142 rq->ls.load.weight);
143 P(ls.delta_fair);
144 P(ls.delta_exec);
145 P(nr_switches);
146 P(nr_load_updates);
147 P(nr_uninterruptible);
148 SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies);
149 P(next_balance);
150 P(curr->pid);
151 P(clock);
152 P(prev_clock_raw);
153 P(clock_warps);
154 P(clock_overflows);
155 P(clock_unstable_events);
156 P(clock_max_delta);
157 P(cpu_load[0]);
158 P(cpu_load[1]);
159 P(cpu_load[2]);
160 P(cpu_load[3]);
161 P(cpu_load[4]);
162#undef P
163
164 print_cfs_stats(m, cpu, now);
165
166 print_rq(m, rq, cpu, now);
167}
168
169static int sched_debug_show(struct seq_file *m, void *v)
170{
171 u64 now = ktime_to_ns(ktime_get());
172 int cpu;
173
174 SEQ_printf(m, "Sched Debug Version: v0.04, cfs-v20, %s %.*s\n",
175 init_utsname()->release,
176 (int)strcspn(init_utsname()->version, " "),
177 init_utsname()->version);
178
179 SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
180
181 for_each_online_cpu(cpu)
182 print_cpu(m, cpu, now);
183
184 SEQ_printf(m, "\n");
185
186 return 0;
187}
188
189void sysrq_sched_debug_show(void)
190{
191 sched_debug_show(NULL, NULL);
192}
193
194static int sched_debug_open(struct inode *inode, struct file *filp)
195{
196 return single_open(filp, sched_debug_show, NULL);
197}
198
199static struct file_operations sched_debug_fops = {
200 .open = sched_debug_open,
201 .read = seq_read,
202 .llseek = seq_lseek,
203 .release = seq_release,
204};
205
206static int __init init_sched_debug_procfs(void)
207{
208 struct proc_dir_entry *pe;
209
210 pe = create_proc_entry("sched_debug", 0644, NULL);
211 if (!pe)
212 return -ENOMEM;
213
214 pe->proc_fops = &sched_debug_fops;
215
216 return 0;
217}
218
219__initcall(init_sched_debug_procfs);
220
221void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
222{
223 unsigned long flags;
224 int num_threads = 1;
225
226 rcu_read_lock();
227 if (lock_task_sighand(p, &flags)) {
228 num_threads = atomic_read(&p->signal->count);
229 unlock_task_sighand(p, &flags);
230 }
231 rcu_read_unlock();
232
233 SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
234 SEQ_printf(m, "----------------------------------------------\n");
235#define P(F) \
236 SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
237
238 P(se.wait_start);
239 P(se.wait_start_fair);
240 P(se.exec_start);
241 P(se.sleep_start);
242 P(se.sleep_start_fair);
243 P(se.block_start);
244 P(se.sleep_max);
245 P(se.block_max);
246 P(se.exec_max);
247 P(se.wait_max);
248 P(se.wait_runtime);
249 P(se.wait_runtime_overruns);
250 P(se.wait_runtime_underruns);
251 P(se.sum_wait_runtime);
252 P(se.sum_exec_runtime);
253 SEQ_printf(m, "%-25s:%20Ld\n",
254 "nr_switches", (long long)(p->nvcsw + p->nivcsw));
255 P(se.load.weight);
256 P(policy);
257 P(prio);
258#undef P
259
260 {
261 u64 t0, t1;
262
263 t0 = sched_clock();
264 t1 = sched_clock();
265 SEQ_printf(m, "%-25s:%20Ld\n",
266 "clock-delta", (long long)(t1-t0));
267 }
268}
269
270void proc_sched_set_task(struct task_struct *p)
271{
272 p->se.sleep_max = p->se.block_max = p->se.exec_max = p->se.wait_max = 0;
273 p->se.wait_runtime_overruns = p->se.wait_runtime_underruns = 0;
274 p->se.sum_exec_runtime = 0;
275}