sched: small sched_debug cleanup
[linux-2.6.git] / 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 static void
32 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
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                 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),
45                 p->prio);
46 #ifdef CONFIG_SCHEDSTATS
47         SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
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,
52                 (long long)p->se.wait_runtime_underruns);
53 #else
54         SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
55                 0LL, 0LL, 0LL, 0LL, 0LL);
56 #endif
57 }
58
59 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
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
80                 print_task(m, rq, p);
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
109 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
110 {
111         SEQ_printf(m, "\ncfs_rq\n");
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
127 static void print_cpu(struct seq_file *m, int cpu)
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);
157         P(idle_clock);
158         P(prev_clock_raw);
159         P(clock_warps);
160         P(clock_overflows);
161         P(clock_deep_idle_events);
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
170         print_cfs_stats(m, cpu);
171
172         print_rq(m, rq, cpu);
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
180         SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",
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)
188                 print_cpu(m, cpu);
189
190         SEQ_printf(m, "\n");
191
192         return 0;
193 }
194
195 static void sysrq_sched_debug_show(void)
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,
209         .release        = single_release,
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
244         P(se.wait_runtime);
245         P(se.wait_start_fair);
246         P(se.exec_start);
247         P(se.sleep_start_fair);
248         P(se.sum_exec_runtime);
249
250 #ifdef CONFIG_SCHEDSTATS
251         P(se.wait_start);
252         P(se.sleep_start);
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);
258         P(se.wait_runtime_overruns);
259         P(se.wait_runtime_underruns);
260         P(se.sum_wait_runtime);
261 #endif
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 {
281 #ifdef CONFIG_SCHEDSTATS
282         p->se.sleep_max                 = 0;
283         p->se.block_max                 = 0;
284         p->se.exec_max                  = 0;
285         p->se.wait_max                  = 0;
286         p->se.wait_runtime_overruns     = 0;
287         p->se.wait_runtime_underruns    = 0;
288 #endif
289         p->se.sum_exec_runtime          = 0;
290         p->se.prev_sum_exec_runtime     = 0;
291 }