Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * trace task wakeup timings |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Based on code from the latency_tracer, that is: |
| 8 | * |
| 9 | * Copyright (C) 2004-2006 Ingo Molnar |
| 10 | * Copyright (C) 2004 William Lee Irwin III |
| 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/fs.h> |
| 14 | #include <linux/debugfs.h> |
| 15 | #include <linux/kallsyms.h> |
| 16 | #include <linux/uaccess.h> |
| 17 | #include <linux/ftrace.h> |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 18 | #include <trace/sched.h> |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 19 | |
| 20 | #include "trace.h" |
| 21 | |
| 22 | static struct trace_array *wakeup_trace; |
| 23 | static int __read_mostly tracer_enabled; |
| 24 | |
| 25 | static struct task_struct *wakeup_task; |
| 26 | static int wakeup_cpu; |
| 27 | static unsigned wakeup_prio = -1; |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 28 | static int wakeup_rt; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 29 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 30 | static raw_spinlock_t wakeup_lock = |
| 31 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 32 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 33 | static void __wakeup_reset(struct trace_array *tr); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 35 | #ifdef CONFIG_FUNCTION_TRACER |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 36 | /* |
| 37 | * irqsoff uses its own tracer function to keep the overhead down: |
| 38 | */ |
| 39 | static void |
| 40 | wakeup_tracer_call(unsigned long ip, unsigned long parent_ip) |
| 41 | { |
| 42 | struct trace_array *tr = wakeup_trace; |
| 43 | struct trace_array_cpu *data; |
| 44 | unsigned long flags; |
| 45 | long disabled; |
| 46 | int resched; |
| 47 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 48 | int pc; |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 49 | |
| 50 | if (likely(!wakeup_task)) |
| 51 | return; |
| 52 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 53 | pc = preempt_count(); |
Steven Rostedt | 182e9f5 | 2008-11-03 23:15:56 -0500 | [diff] [blame] | 54 | resched = ftrace_preempt_disable(); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 55 | |
| 56 | cpu = raw_smp_processor_id(); |
| 57 | data = tr->data[cpu]; |
| 58 | disabled = atomic_inc_return(&data->disabled); |
| 59 | if (unlikely(disabled != 1)) |
| 60 | goto out; |
| 61 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 62 | local_irq_save(flags); |
| 63 | __raw_spin_lock(&wakeup_lock); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 64 | |
| 65 | if (unlikely(!wakeup_task)) |
| 66 | goto unlock; |
| 67 | |
| 68 | /* |
| 69 | * The task can't disappear because it needs to |
| 70 | * wake up first, and we have the wakeup_lock. |
| 71 | */ |
| 72 | if (task_cpu(wakeup_task) != cpu) |
| 73 | goto unlock; |
| 74 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 75 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 76 | |
| 77 | unlock: |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 78 | __raw_spin_unlock(&wakeup_lock); |
| 79 | local_irq_restore(flags); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 80 | |
| 81 | out: |
| 82 | atomic_dec(&data->disabled); |
| 83 | |
Steven Rostedt | 182e9f5 | 2008-11-03 23:15:56 -0500 | [diff] [blame] | 84 | ftrace_preempt_enable(resched); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static struct ftrace_ops trace_ops __read_mostly = |
| 88 | { |
| 89 | .func = wakeup_tracer_call, |
| 90 | }; |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 91 | #endif /* CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 92 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 93 | /* |
| 94 | * Should this new latency be reported/recorded? |
| 95 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 96 | static int report_latency(cycle_t delta) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 97 | { |
| 98 | if (tracing_thresh) { |
| 99 | if (delta < tracing_thresh) |
| 100 | return 0; |
| 101 | } else { |
| 102 | if (delta <= tracing_max_latency) |
| 103 | return 0; |
| 104 | } |
| 105 | return 1; |
| 106 | } |
| 107 | |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 108 | static void notrace |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 109 | probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev, |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 110 | struct task_struct *next) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 111 | { |
| 112 | unsigned long latency = 0, t0 = 0, t1 = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 113 | struct trace_array_cpu *data; |
| 114 | cycle_t T0, T1, delta; |
| 115 | unsigned long flags; |
| 116 | long disabled; |
| 117 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 118 | int pc; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 119 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 120 | tracing_record_cmdline(prev); |
| 121 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 122 | if (unlikely(!tracer_enabled)) |
| 123 | return; |
| 124 | |
| 125 | /* |
| 126 | * When we start a new trace, we set wakeup_task to NULL |
| 127 | * and then set tracer_enabled = 1. We want to make sure |
| 128 | * that another CPU does not see the tracer_enabled = 1 |
| 129 | * and the wakeup_task with an older task, that might |
| 130 | * actually be the same as next. |
| 131 | */ |
| 132 | smp_rmb(); |
| 133 | |
| 134 | if (next != wakeup_task) |
| 135 | return; |
| 136 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 137 | pc = preempt_count(); |
| 138 | |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 139 | /* The task we are waiting for is waking up */ |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 140 | data = wakeup_trace->data[wakeup_cpu]; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 141 | |
| 142 | /* disable local data, not wakeup_cpu data */ |
| 143 | cpu = raw_smp_processor_id(); |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 144 | disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 145 | if (likely(disabled != 1)) |
| 146 | goto out; |
| 147 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 148 | local_irq_save(flags); |
| 149 | __raw_spin_lock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 150 | |
| 151 | /* We could race with grabbing wakeup_lock */ |
| 152 | if (unlikely(!tracer_enabled || next != wakeup_task)) |
| 153 | goto out_unlock; |
| 154 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 155 | trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, flags, pc); |
Steven Rostedt | f8ec106 | 2009-01-21 17:17:04 -0500 | [diff] [blame] | 156 | tracing_sched_switch_trace(wakeup_trace, data, prev, next, flags, pc); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 157 | |
| 158 | /* |
| 159 | * usecs conversion is slow so we try to delay the conversion |
| 160 | * as long as possible: |
| 161 | */ |
| 162 | T0 = data->preempt_timestamp; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 163 | T1 = ftrace_now(cpu); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 164 | delta = T1-T0; |
| 165 | |
| 166 | if (!report_latency(delta)) |
| 167 | goto out_unlock; |
| 168 | |
| 169 | latency = nsecs_to_usecs(delta); |
| 170 | |
| 171 | tracing_max_latency = delta; |
| 172 | t0 = nsecs_to_usecs(T0); |
| 173 | t1 = nsecs_to_usecs(T1); |
| 174 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 175 | update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 176 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 177 | out_unlock: |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 178 | __wakeup_reset(wakeup_trace); |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 179 | __raw_spin_unlock(&wakeup_lock); |
| 180 | local_irq_restore(flags); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 181 | out: |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 182 | atomic_dec(&wakeup_trace->data[cpu]->disabled); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 183 | } |
| 184 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 185 | static void __wakeup_reset(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 186 | { |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 187 | int cpu; |
| 188 | |
Arnaldo Carvalho de Melo | b3a8c34 | 2009-01-28 13:08:37 -0200 | [diff] [blame^] | 189 | for_each_possible_cpu(cpu) |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 190 | tracing_reset(tr, cpu); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 191 | |
| 192 | wakeup_cpu = -1; |
| 193 | wakeup_prio = -1; |
| 194 | |
| 195 | if (wakeup_task) |
| 196 | put_task_struct(wakeup_task); |
| 197 | |
| 198 | wakeup_task = NULL; |
| 199 | } |
| 200 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 201 | static void wakeup_reset(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 202 | { |
| 203 | unsigned long flags; |
| 204 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 205 | local_irq_save(flags); |
| 206 | __raw_spin_lock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 207 | __wakeup_reset(tr); |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 208 | __raw_spin_unlock(&wakeup_lock); |
| 209 | local_irq_restore(flags); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 210 | } |
| 211 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 212 | static void |
Peter Zijlstra | 468a15b | 2008-12-16 08:07:03 +0100 | [diff] [blame] | 213 | probe_wakeup(struct rq *rq, struct task_struct *p, int success) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 214 | { |
Steven Rostedt | f8ec106 | 2009-01-21 17:17:04 -0500 | [diff] [blame] | 215 | struct trace_array_cpu *data; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 216 | int cpu = smp_processor_id(); |
| 217 | unsigned long flags; |
| 218 | long disabled; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 219 | int pc; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 220 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 221 | if (likely(!tracer_enabled)) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 222 | return; |
| 223 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 224 | tracing_record_cmdline(p); |
| 225 | tracing_record_cmdline(current); |
| 226 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 227 | if ((wakeup_rt && !rt_task(p)) || |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 228 | p->prio >= wakeup_prio || |
| 229 | p->prio >= current->prio) |
| 230 | return; |
| 231 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 232 | pc = preempt_count(); |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 233 | disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 234 | if (unlikely(disabled != 1)) |
| 235 | goto out; |
| 236 | |
| 237 | /* interrupts should be off from try_to_wake_up */ |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 238 | __raw_spin_lock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 239 | |
| 240 | /* check for races. */ |
| 241 | if (!tracer_enabled || p->prio >= wakeup_prio) |
| 242 | goto out_locked; |
| 243 | |
| 244 | /* reset the trace */ |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 245 | __wakeup_reset(wakeup_trace); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 246 | |
| 247 | wakeup_cpu = task_cpu(p); |
| 248 | wakeup_prio = p->prio; |
| 249 | |
| 250 | wakeup_task = p; |
| 251 | get_task_struct(wakeup_task); |
| 252 | |
| 253 | local_save_flags(flags); |
| 254 | |
Steven Rostedt | f8ec106 | 2009-01-21 17:17:04 -0500 | [diff] [blame] | 255 | data = wakeup_trace->data[wakeup_cpu]; |
| 256 | data->preempt_timestamp = ftrace_now(cpu); |
| 257 | tracing_sched_wakeup_trace(wakeup_trace, data, p, current, |
| 258 | flags, pc); |
| 259 | trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, |
| 260 | flags, pc); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 261 | |
| 262 | out_locked: |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 263 | __raw_spin_unlock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 264 | out: |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 265 | atomic_dec(&wakeup_trace->data[cpu]->disabled); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 266 | } |
| 267 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 268 | static void start_wakeup_tracer(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 269 | { |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 270 | int ret; |
| 271 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 272 | ret = register_trace_sched_wakeup(probe_wakeup); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 273 | if (ret) { |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 274 | pr_info("wakeup trace: Couldn't activate tracepoint" |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 275 | " probe to kernel_sched_wakeup\n"); |
| 276 | return; |
| 277 | } |
| 278 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 279 | ret = register_trace_sched_wakeup_new(probe_wakeup); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 280 | if (ret) { |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 281 | pr_info("wakeup trace: Couldn't activate tracepoint" |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 282 | " probe to kernel_sched_wakeup_new\n"); |
| 283 | goto fail_deprobe; |
| 284 | } |
| 285 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 286 | ret = register_trace_sched_switch(probe_wakeup_sched_switch); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 287 | if (ret) { |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 288 | pr_info("sched trace: Couldn't activate tracepoint" |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 289 | " probe to kernel_sched_schedule\n"); |
| 290 | goto fail_deprobe_wake_new; |
| 291 | } |
| 292 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 293 | wakeup_reset(tr); |
| 294 | |
| 295 | /* |
| 296 | * Don't let the tracer_enabled = 1 show up before |
| 297 | * the wakeup_task is reset. This may be overkill since |
| 298 | * wakeup_reset does a spin_unlock after setting the |
| 299 | * wakeup_task to NULL, but I want to be safe. |
| 300 | * This is a slow path anyway. |
| 301 | */ |
| 302 | smp_wmb(); |
| 303 | |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 304 | register_ftrace_function(&trace_ops); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 305 | |
Steven Rostedt | 5bc4564 | 2009-01-21 14:36:52 -0500 | [diff] [blame] | 306 | if (tracing_is_enabled()) |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 307 | tracer_enabled = 1; |
Steven Rostedt | 5bc4564 | 2009-01-21 14:36:52 -0500 | [diff] [blame] | 308 | else |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 309 | tracer_enabled = 0; |
Steven Rostedt | ad59124 | 2008-07-10 20:58:13 -0400 | [diff] [blame] | 310 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 311 | return; |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 312 | fail_deprobe_wake_new: |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 313 | unregister_trace_sched_wakeup_new(probe_wakeup); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 314 | fail_deprobe: |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 315 | unregister_trace_sched_wakeup(probe_wakeup); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 316 | } |
| 317 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 318 | static void stop_wakeup_tracer(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 319 | { |
| 320 | tracer_enabled = 0; |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 321 | unregister_ftrace_function(&trace_ops); |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 322 | unregister_trace_sched_switch(probe_wakeup_sched_switch); |
| 323 | unregister_trace_sched_wakeup_new(probe_wakeup); |
| 324 | unregister_trace_sched_wakeup(probe_wakeup); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 325 | } |
| 326 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 327 | static int __wakeup_tracer_init(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 328 | { |
Steven Rostedt | 745b162 | 2009-01-15 23:40:11 -0500 | [diff] [blame] | 329 | tracing_max_latency = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 330 | wakeup_trace = tr; |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 331 | start_wakeup_tracer(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 332 | return 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 333 | } |
| 334 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 335 | static int wakeup_tracer_init(struct trace_array *tr) |
| 336 | { |
| 337 | wakeup_rt = 0; |
| 338 | return __wakeup_tracer_init(tr); |
| 339 | } |
| 340 | |
| 341 | static int wakeup_rt_tracer_init(struct trace_array *tr) |
| 342 | { |
| 343 | wakeup_rt = 1; |
| 344 | return __wakeup_tracer_init(tr); |
| 345 | } |
| 346 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 347 | static void wakeup_tracer_reset(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 348 | { |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 349 | stop_wakeup_tracer(tr); |
| 350 | /* make sure we put back any tasks we are tracing */ |
| 351 | wakeup_reset(tr); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 352 | } |
| 353 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 354 | static void wakeup_tracer_start(struct trace_array *tr) |
| 355 | { |
| 356 | wakeup_reset(tr); |
| 357 | tracer_enabled = 1; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | static void wakeup_tracer_stop(struct trace_array *tr) |
| 361 | { |
| 362 | tracer_enabled = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static struct tracer wakeup_tracer __read_mostly = |
| 366 | { |
| 367 | .name = "wakeup", |
| 368 | .init = wakeup_tracer_init, |
| 369 | .reset = wakeup_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 370 | .start = wakeup_tracer_start, |
| 371 | .stop = wakeup_tracer_stop, |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 372 | .print_max = 1, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 373 | #ifdef CONFIG_FTRACE_SELFTEST |
| 374 | .selftest = trace_selftest_startup_wakeup, |
| 375 | #endif |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 376 | }; |
| 377 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 378 | static struct tracer wakeup_rt_tracer __read_mostly = |
| 379 | { |
| 380 | .name = "wakeup_rt", |
| 381 | .init = wakeup_rt_tracer_init, |
| 382 | .reset = wakeup_tracer_reset, |
| 383 | .start = wakeup_tracer_start, |
| 384 | .stop = wakeup_tracer_stop, |
| 385 | .print_max = 1, |
| 386 | #ifdef CONFIG_FTRACE_SELFTEST |
| 387 | .selftest = trace_selftest_startup_wakeup, |
| 388 | #endif |
| 389 | }; |
| 390 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 391 | __init static int init_wakeup_tracer(void) |
| 392 | { |
| 393 | int ret; |
| 394 | |
| 395 | ret = register_tracer(&wakeup_tracer); |
| 396 | if (ret) |
| 397 | return ret; |
| 398 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 399 | ret = register_tracer(&wakeup_rt_tracer); |
| 400 | if (ret) |
| 401 | return ret; |
| 402 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 403 | return 0; |
| 404 | } |
| 405 | device_initcall(init_wakeup_tracer); |