sched: debug: update exec_clock only when SCHED_DEBUG
[linux-2.6] / 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 %15Ld\n",
48                 (long long)p->se.vruntime,
49                 (long long)p->se.sum_exec_runtime,
50                 (long long)p->se.sum_wait_runtime,
51                 (long long)p->se.sum_sleep_runtime,
52                 (long long)p->se.wait_runtime_overruns,
53                 (long long)p->se.wait_runtime_underruns);
54 #else
55         SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
56                 0LL, 0LL, 0LL, 0LL, 0LL);
57 #endif
58 }
59
60 static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
61 {
62         struct task_struct *g, *p;
63
64         SEQ_printf(m,
65         "\nrunnable tasks:\n"
66         "            task   PID        tree-key         delta       waiting"
67         "  switches  prio"
68         "    exec-runtime        sum-exec        sum-wait       sum-sleep"
69         "    wait-overrun   wait-underrun\n"
70         "------------------------------------------------------------------"
71         "--------------------------------"
72         "------------------------------------------------"
73         "--------------------------------\n");
74
75         read_lock_irq(&tasklist_lock);
76
77         do_each_thread(g, p) {
78                 if (!p->se.on_rq || task_cpu(p) != rq_cpu)
79                         continue;
80
81                 print_task(m, rq, p);
82         } while_each_thread(g, p);
83
84         read_unlock_irq(&tasklist_lock);
85 }
86
87 static void
88 print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
89 {
90         s64 wait_runtime_rq_sum = 0;
91         struct task_struct *p;
92         struct rb_node *curr;
93         unsigned long flags;
94         struct rq *rq = &per_cpu(runqueues, cpu);
95
96         spin_lock_irqsave(&rq->lock, flags);
97         curr = first_fair(cfs_rq);
98         while (curr) {
99                 p = rb_entry(curr, struct task_struct, se.run_node);
100                 wait_runtime_rq_sum += p->se.wait_runtime;
101
102                 curr = rb_next(curr);
103         }
104         spin_unlock_irqrestore(&rq->lock, flags);
105
106         SEQ_printf(m, "  .%-30s: %Ld\n", "wait_runtime_rq_sum",
107                 (long long)wait_runtime_rq_sum);
108 }
109
110 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
111 {
112         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
113                 spread, rq0_min_vruntime, spread0;
114         struct rq *rq = &per_cpu(runqueues, cpu);
115         struct sched_entity *last;
116         unsigned long flags;
117
118         SEQ_printf(m, "\ncfs_rq\n");
119
120 #define P(x) \
121         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
122
123         P(fair_clock);
124         P(exec_clock);
125
126         spin_lock_irqsave(&rq->lock, flags);
127         if (cfs_rq->rb_leftmost)
128                 MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
129         last = __pick_last_entity(cfs_rq);
130         if (last)
131                 max_vruntime = last->vruntime;
132         min_vruntime = rq->cfs.min_vruntime;
133         rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
134         spin_unlock_irqrestore(&rq->lock, flags);
135         SEQ_printf(m, "  .%-30s: %Ld\n", "MIN_vruntime",
136                         (long long)MIN_vruntime);
137         SEQ_printf(m, "  .%-30s: %Ld\n", "min_vruntime",
138                         (long long)min_vruntime);
139         SEQ_printf(m, "  .%-30s: %Ld\n", "max_vruntime",
140                         (long long)max_vruntime);
141         spread = max_vruntime - MIN_vruntime;
142         SEQ_printf(m, "  .%-30s: %Ld\n", "spread",
143                         (long long)spread);
144         spread0 = min_vruntime - rq0_min_vruntime;
145         SEQ_printf(m, "  .%-30s: %Ld\n", "spread0",
146                         (long long)spread0);
147
148         P(wait_runtime);
149         P(wait_runtime_overruns);
150         P(wait_runtime_underruns);
151         P(sleeper_bonus);
152 #undef P
153
154         print_cfs_rq_runtime_sum(m, cpu, cfs_rq);
155 }
156
157 static void print_cpu(struct seq_file *m, int cpu)
158 {
159         struct rq *rq = &per_cpu(runqueues, cpu);
160
161 #ifdef CONFIG_X86
162         {
163                 unsigned int freq = cpu_khz ? : 1;
164
165                 SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
166                            cpu, freq / 1000, (freq % 1000));
167         }
168 #else
169         SEQ_printf(m, "\ncpu#%d\n", cpu);
170 #endif
171
172 #define P(x) \
173         SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rq->x))
174
175         P(nr_running);
176         SEQ_printf(m, "  .%-30s: %lu\n", "load",
177                    rq->ls.load.weight);
178         P(nr_switches);
179         P(nr_load_updates);
180         P(nr_uninterruptible);
181         SEQ_printf(m, "  .%-30s: %lu\n", "jiffies", jiffies);
182         P(next_balance);
183         P(curr->pid);
184         P(clock);
185         P(idle_clock);
186         P(prev_clock_raw);
187         P(clock_warps);
188         P(clock_overflows);
189         P(clock_deep_idle_events);
190         P(clock_max_delta);
191         P(cpu_load[0]);
192         P(cpu_load[1]);
193         P(cpu_load[2]);
194         P(cpu_load[3]);
195         P(cpu_load[4]);
196 #undef P
197
198         print_cfs_stats(m, cpu);
199
200         print_rq(m, rq, cpu);
201 }
202
203 static int sched_debug_show(struct seq_file *m, void *v)
204 {
205         u64 now = ktime_to_ns(ktime_get());
206         int cpu;
207
208         SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",
209                 init_utsname()->release,
210                 (int)strcspn(init_utsname()->version, " "),
211                 init_utsname()->version);
212
213         SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
214
215         for_each_online_cpu(cpu)
216                 print_cpu(m, cpu);
217
218         SEQ_printf(m, "\n");
219
220         return 0;
221 }
222
223 static void sysrq_sched_debug_show(void)
224 {
225         sched_debug_show(NULL, NULL);
226 }
227
228 static int sched_debug_open(struct inode *inode, struct file *filp)
229 {
230         return single_open(filp, sched_debug_show, NULL);
231 }
232
233 static struct file_operations sched_debug_fops = {
234         .open           = sched_debug_open,
235         .read           = seq_read,
236         .llseek         = seq_lseek,
237         .release        = single_release,
238 };
239
240 static int __init init_sched_debug_procfs(void)
241 {
242         struct proc_dir_entry *pe;
243
244         pe = create_proc_entry("sched_debug", 0644, NULL);
245         if (!pe)
246                 return -ENOMEM;
247
248         pe->proc_fops = &sched_debug_fops;
249
250         return 0;
251 }
252
253 __initcall(init_sched_debug_procfs);
254
255 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
256 {
257         unsigned long flags;
258         int num_threads = 1;
259
260         rcu_read_lock();
261         if (lock_task_sighand(p, &flags)) {
262                 num_threads = atomic_read(&p->signal->count);
263                 unlock_task_sighand(p, &flags);
264         }
265         rcu_read_unlock();
266
267         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
268         SEQ_printf(m, "----------------------------------------------\n");
269 #define P(F) \
270         SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
271
272         P(se.wait_runtime);
273         P(se.wait_start_fair);
274         P(se.exec_start);
275         P(se.sleep_start_fair);
276         P(se.vruntime);
277         P(se.sum_exec_runtime);
278
279 #ifdef CONFIG_SCHEDSTATS
280         P(se.wait_start);
281         P(se.sleep_start);
282         P(se.block_start);
283         P(se.sleep_max);
284         P(se.block_max);
285         P(se.exec_max);
286         P(se.slice_max);
287         P(se.wait_max);
288         P(se.wait_runtime_overruns);
289         P(se.wait_runtime_underruns);
290         P(se.sum_wait_runtime);
291 #endif
292         SEQ_printf(m, "%-25s:%20Ld\n",
293                    "nr_switches", (long long)(p->nvcsw + p->nivcsw));
294         P(se.load.weight);
295         P(policy);
296         P(prio);
297 #undef P
298
299         {
300                 u64 t0, t1;
301
302                 t0 = sched_clock();
303                 t1 = sched_clock();
304                 SEQ_printf(m, "%-25s:%20Ld\n",
305                            "clock-delta", (long long)(t1-t0));
306         }
307 }
308
309 void proc_sched_set_task(struct task_struct *p)
310 {
311 #ifdef CONFIG_SCHEDSTATS
312         p->se.sleep_max                 = 0;
313         p->se.block_max                 = 0;
314         p->se.exec_max                  = 0;
315         p->se.slice_max                 = 0;
316         p->se.wait_max                  = 0;
317         p->se.wait_runtime_overruns     = 0;
318         p->se.wait_runtime_underruns    = 0;
319 #endif
320         p->se.sum_exec_runtime          = 0;
321         p->se.prev_sum_exec_runtime     = 0;
322 }