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 |
Nadia Yvette Chambers | 6d49e35 | 2012-12-06 10:39:54 +0100 | [diff] [blame] | 10 | * Copyright (C) 2004 Nadia Yvette Chambers |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 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> |
Clark Williams | 8bd75c7 | 2013-02-07 09:47:07 -0600 | [diff] [blame] | 18 | #include <linux/sched/rt.h> |
Dario Faggioli | 2d3d891 | 2013-11-07 14:43:44 +0100 | [diff] [blame] | 19 | #include <linux/sched/deadline.h> |
Steven Rostedt | ad8d75f | 2009-04-14 19:39:12 -0400 | [diff] [blame] | 20 | #include <trace/events/sched.h> |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 21 | #include "trace.h" |
| 22 | |
| 23 | static struct trace_array *wakeup_trace; |
| 24 | static int __read_mostly tracer_enabled; |
| 25 | |
| 26 | static struct task_struct *wakeup_task; |
| 27 | static int wakeup_cpu; |
Steven Rostedt | 478142c3 | 2009-09-09 10:36:01 -0400 | [diff] [blame] | 28 | static int wakeup_current_cpu; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 29 | static unsigned wakeup_prio = -1; |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 30 | static int wakeup_rt; |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 31 | static int wakeup_dl; |
| 32 | static int tracing_dl = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 33 | |
Thomas Gleixner | 445c895 | 2009-12-02 19:49:50 +0100 | [diff] [blame] | 34 | static arch_spinlock_t wakeup_lock = |
Thomas Gleixner | edc35bd | 2009-12-03 12:38:57 +0100 | [diff] [blame] | 35 | (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 36 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 37 | static void wakeup_reset(struct trace_array *tr); |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 38 | static void __wakeup_reset(struct trace_array *tr); |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 39 | static int wakeup_graph_entry(struct ftrace_graph_ent *trace); |
| 40 | static void wakeup_graph_return(struct ftrace_graph_ret *trace); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 41 | |
Steven Rostedt (Red Hat) | 613f04a | 2013-03-14 15:03:53 -0400 | [diff] [blame] | 42 | static int save_flags; |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 43 | static bool function_enabled; |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 44 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 45 | #define TRACE_DISPLAY_GRAPH 1 |
| 46 | |
| 47 | static struct tracer_opt trace_opts[] = { |
| 48 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 49 | /* display latency trace as call graph */ |
| 50 | { TRACER_OPT(display-graph, TRACE_DISPLAY_GRAPH) }, |
| 51 | #endif |
| 52 | { } /* Empty entry */ |
| 53 | }; |
| 54 | |
| 55 | static struct tracer_flags tracer_flags = { |
| 56 | .val = 0, |
| 57 | .opts = trace_opts, |
| 58 | }; |
| 59 | |
| 60 | #define is_graph() (tracer_flags.val & TRACE_DISPLAY_GRAPH) |
| 61 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 62 | #ifdef CONFIG_FUNCTION_TRACER |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 63 | |
| 64 | /* |
| 65 | * Prologue for the wakeup function tracers. |
| 66 | * |
| 67 | * Returns 1 if it is OK to continue, and preemption |
| 68 | * is disabled and data->disabled is incremented. |
| 69 | * 0 if the trace is to be ignored, and preemption |
| 70 | * is not disabled and data->disabled is |
| 71 | * kept the same. |
| 72 | * |
| 73 | * Note, this function is also used outside this ifdef but |
| 74 | * inside the #ifdef of the function graph tracer below. |
| 75 | * This is OK, since the function graph tracer is |
| 76 | * dependent on the function tracer. |
| 77 | */ |
| 78 | static int |
| 79 | func_prolog_preempt_disable(struct trace_array *tr, |
| 80 | struct trace_array_cpu **data, |
| 81 | int *pc) |
| 82 | { |
| 83 | long disabled; |
| 84 | int cpu; |
| 85 | |
| 86 | if (likely(!wakeup_task)) |
| 87 | return 0; |
| 88 | |
| 89 | *pc = preempt_count(); |
| 90 | preempt_disable_notrace(); |
| 91 | |
| 92 | cpu = raw_smp_processor_id(); |
| 93 | if (cpu != wakeup_current_cpu) |
| 94 | goto out_enable; |
| 95 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 96 | *data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 97 | disabled = atomic_inc_return(&(*data)->disabled); |
| 98 | if (unlikely(disabled != 1)) |
| 99 | goto out; |
| 100 | |
| 101 | return 1; |
| 102 | |
| 103 | out: |
| 104 | atomic_dec(&(*data)->disabled); |
| 105 | |
| 106 | out_enable: |
| 107 | preempt_enable_notrace(); |
| 108 | return 0; |
| 109 | } |
| 110 | |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 111 | /* |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 112 | * wakeup uses its own tracer function to keep the overhead down: |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 113 | */ |
| 114 | static void |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 115 | wakeup_tracer_call(unsigned long ip, unsigned long parent_ip, |
| 116 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 117 | { |
| 118 | struct trace_array *tr = wakeup_trace; |
| 119 | struct trace_array_cpu *data; |
| 120 | unsigned long flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 121 | int pc; |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 122 | |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 123 | if (!func_prolog_preempt_disable(tr, &data, &pc)) |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 124 | return; |
| 125 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 126 | local_irq_save(flags); |
Arnaldo Carvalho de Melo | 7be4215 | 2009-02-05 01:13:37 -0500 | [diff] [blame] | 127 | trace_function(tr, ip, parent_ip, flags, pc); |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 128 | local_irq_restore(flags); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 129 | |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 130 | atomic_dec(&data->disabled); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 131 | preempt_enable_notrace(); |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static struct ftrace_ops trace_ops __read_mostly = |
| 135 | { |
| 136 | .func = wakeup_tracer_call, |
Steven Rostedt | 4740974 | 2012-07-20 11:04:44 -0400 | [diff] [blame] | 137 | .flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE, |
Steven Rostedt | 7e18d8e | 2008-05-22 00:22:19 -0400 | [diff] [blame] | 138 | }; |
Steven Rostedt | 7e40798 | 2010-10-19 10:56:19 -0400 | [diff] [blame] | 139 | #endif /* CONFIG_FUNCTION_TRACER */ |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 140 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 141 | static int register_wakeup_function(int graph, int set) |
| 142 | { |
| 143 | int ret; |
| 144 | |
| 145 | /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */ |
| 146 | if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION))) |
| 147 | return 0; |
| 148 | |
| 149 | if (graph) |
| 150 | ret = register_ftrace_graph(&wakeup_graph_return, |
| 151 | &wakeup_graph_entry); |
| 152 | else |
| 153 | ret = register_ftrace_function(&trace_ops); |
| 154 | |
| 155 | if (!ret) |
| 156 | function_enabled = true; |
| 157 | |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | static void unregister_wakeup_function(int graph) |
| 162 | { |
| 163 | if (!function_enabled) |
| 164 | return; |
| 165 | |
| 166 | if (graph) |
| 167 | unregister_ftrace_graph(); |
| 168 | else |
| 169 | unregister_ftrace_function(&trace_ops); |
| 170 | |
| 171 | function_enabled = false; |
| 172 | } |
| 173 | |
| 174 | static void wakeup_function_set(int set) |
| 175 | { |
| 176 | if (set) |
| 177 | register_wakeup_function(is_graph(), 1); |
| 178 | else |
| 179 | unregister_wakeup_function(is_graph()); |
| 180 | } |
| 181 | |
| 182 | static int wakeup_flag_changed(struct tracer *tracer, u32 mask, int set) |
| 183 | { |
| 184 | if (mask & TRACE_ITER_FUNCTION) |
| 185 | wakeup_function_set(set); |
| 186 | |
| 187 | return trace_keep_overwrite(tracer, mask, set); |
| 188 | } |
| 189 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 190 | static int start_func_tracer(int graph) |
| 191 | { |
| 192 | int ret; |
| 193 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 194 | ret = register_wakeup_function(graph, 0); |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 195 | |
| 196 | if (!ret && tracing_is_enabled()) |
| 197 | tracer_enabled = 1; |
| 198 | else |
| 199 | tracer_enabled = 0; |
| 200 | |
| 201 | return ret; |
| 202 | } |
| 203 | |
| 204 | static void stop_func_tracer(int graph) |
| 205 | { |
| 206 | tracer_enabled = 0; |
| 207 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 208 | unregister_wakeup_function(graph); |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 209 | } |
| 210 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 211 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 212 | static int wakeup_set_flag(u32 old_flags, u32 bit, int set) |
| 213 | { |
| 214 | |
| 215 | if (!(bit & TRACE_DISPLAY_GRAPH)) |
| 216 | return -EINVAL; |
| 217 | |
| 218 | if (!(is_graph() ^ set)) |
| 219 | return 0; |
| 220 | |
| 221 | stop_func_tracer(!set); |
| 222 | |
| 223 | wakeup_reset(wakeup_trace); |
| 224 | tracing_max_latency = 0; |
| 225 | |
| 226 | return start_func_tracer(set); |
| 227 | } |
| 228 | |
| 229 | static int wakeup_graph_entry(struct ftrace_graph_ent *trace) |
| 230 | { |
| 231 | struct trace_array *tr = wakeup_trace; |
| 232 | struct trace_array_cpu *data; |
| 233 | unsigned long flags; |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 234 | int pc, ret = 0; |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 235 | |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 236 | if (!func_prolog_preempt_disable(tr, &data, &pc)) |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 237 | return 0; |
| 238 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 239 | local_save_flags(flags); |
| 240 | ret = __trace_graph_entry(tr, trace, flags, pc); |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 241 | atomic_dec(&data->disabled); |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 242 | preempt_enable_notrace(); |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 243 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | static void wakeup_graph_return(struct ftrace_graph_ret *trace) |
| 248 | { |
| 249 | struct trace_array *tr = wakeup_trace; |
| 250 | struct trace_array_cpu *data; |
| 251 | unsigned long flags; |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 252 | int pc; |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 253 | |
Steven Rostedt | 542181d | 2010-10-05 16:38:49 -0400 | [diff] [blame] | 254 | if (!func_prolog_preempt_disable(tr, &data, &pc)) |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 255 | return; |
| 256 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 257 | local_save_flags(flags); |
| 258 | __trace_graph_return(tr, trace, flags, pc); |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 259 | atomic_dec(&data->disabled); |
| 260 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 261 | preempt_enable_notrace(); |
| 262 | return; |
| 263 | } |
| 264 | |
| 265 | static void wakeup_trace_open(struct trace_iterator *iter) |
| 266 | { |
| 267 | if (is_graph()) |
| 268 | graph_trace_open(iter); |
| 269 | } |
| 270 | |
| 271 | static void wakeup_trace_close(struct trace_iterator *iter) |
| 272 | { |
| 273 | if (iter->private) |
| 274 | graph_trace_close(iter); |
| 275 | } |
| 276 | |
Jiri Olsa | 321e68b0 | 2011-06-03 16:58:47 +0200 | [diff] [blame] | 277 | #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \ |
| 278 | TRACE_GRAPH_PRINT_ABS_TIME | \ |
| 279 | TRACE_GRAPH_PRINT_DURATION) |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 280 | |
| 281 | static enum print_line_t wakeup_print_line(struct trace_iterator *iter) |
| 282 | { |
| 283 | /* |
| 284 | * In graph mode call the graph tracer output function, |
| 285 | * otherwise go with the TRACE_FN event handler |
| 286 | */ |
| 287 | if (is_graph()) |
| 288 | return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS); |
| 289 | |
| 290 | return TRACE_TYPE_UNHANDLED; |
| 291 | } |
| 292 | |
| 293 | static void wakeup_print_header(struct seq_file *s) |
| 294 | { |
| 295 | if (is_graph()) |
| 296 | print_graph_headers_flags(s, GRAPH_TRACER_FLAGS); |
| 297 | else |
| 298 | trace_default_header(s); |
| 299 | } |
| 300 | |
| 301 | static void |
| 302 | __trace_function(struct trace_array *tr, |
| 303 | unsigned long ip, unsigned long parent_ip, |
| 304 | unsigned long flags, int pc) |
| 305 | { |
| 306 | if (is_graph()) |
| 307 | trace_graph_function(tr, ip, parent_ip, flags, pc); |
| 308 | else |
| 309 | trace_function(tr, ip, parent_ip, flags, pc); |
| 310 | } |
| 311 | #else |
| 312 | #define __trace_function trace_function |
| 313 | |
| 314 | static int wakeup_set_flag(u32 old_flags, u32 bit, int set) |
| 315 | { |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | |
| 319 | static int wakeup_graph_entry(struct ftrace_graph_ent *trace) |
| 320 | { |
| 321 | return -1; |
| 322 | } |
| 323 | |
| 324 | static enum print_line_t wakeup_print_line(struct trace_iterator *iter) |
| 325 | { |
| 326 | return TRACE_TYPE_UNHANDLED; |
| 327 | } |
| 328 | |
| 329 | static void wakeup_graph_return(struct ftrace_graph_ret *trace) { } |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 330 | static void wakeup_trace_open(struct trace_iterator *iter) { } |
| 331 | static void wakeup_trace_close(struct trace_iterator *iter) { } |
Jiri Olsa | 7e9a49e | 2011-11-07 16:08:49 +0100 | [diff] [blame] | 332 | |
| 333 | #ifdef CONFIG_FUNCTION_TRACER |
| 334 | static void wakeup_print_header(struct seq_file *s) |
| 335 | { |
| 336 | trace_default_header(s); |
| 337 | } |
| 338 | #else |
| 339 | static void wakeup_print_header(struct seq_file *s) |
| 340 | { |
| 341 | trace_latency_header(s); |
| 342 | } |
| 343 | #endif /* CONFIG_FUNCTION_TRACER */ |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 344 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 345 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 346 | /* |
| 347 | * Should this new latency be reported/recorded? |
| 348 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 349 | static int report_latency(cycle_t delta) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 350 | { |
| 351 | if (tracing_thresh) { |
| 352 | if (delta < tracing_thresh) |
| 353 | return 0; |
| 354 | } else { |
| 355 | if (delta <= tracing_max_latency) |
| 356 | return 0; |
| 357 | } |
| 358 | return 1; |
| 359 | } |
| 360 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 361 | static void |
| 362 | probe_wakeup_migrate_task(void *ignore, struct task_struct *task, int cpu) |
Steven Rostedt | 478142c3 | 2009-09-09 10:36:01 -0400 | [diff] [blame] | 363 | { |
| 364 | if (task != wakeup_task) |
| 365 | return; |
| 366 | |
| 367 | wakeup_current_cpu = cpu; |
| 368 | } |
| 369 | |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 370 | static void notrace |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 371 | probe_wakeup_sched_switch(void *ignore, |
| 372 | struct task_struct *prev, struct task_struct *next) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 373 | { |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 374 | struct trace_array_cpu *data; |
| 375 | cycle_t T0, T1, delta; |
| 376 | unsigned long flags; |
| 377 | long disabled; |
| 378 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 379 | int pc; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 380 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 381 | tracing_record_cmdline(prev); |
| 382 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 383 | if (unlikely(!tracer_enabled)) |
| 384 | return; |
| 385 | |
| 386 | /* |
| 387 | * When we start a new trace, we set wakeup_task to NULL |
| 388 | * and then set tracer_enabled = 1. We want to make sure |
| 389 | * that another CPU does not see the tracer_enabled = 1 |
| 390 | * and the wakeup_task with an older task, that might |
| 391 | * actually be the same as next. |
| 392 | */ |
| 393 | smp_rmb(); |
| 394 | |
| 395 | if (next != wakeup_task) |
| 396 | return; |
| 397 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 398 | pc = preempt_count(); |
| 399 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 400 | /* disable local data, not wakeup_cpu data */ |
| 401 | cpu = raw_smp_processor_id(); |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 402 | disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 403 | if (likely(disabled != 1)) |
| 404 | goto out; |
| 405 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 406 | local_irq_save(flags); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 407 | arch_spin_lock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 408 | |
| 409 | /* We could race with grabbing wakeup_lock */ |
| 410 | if (unlikely(!tracer_enabled || next != wakeup_task)) |
| 411 | goto out_unlock; |
| 412 | |
Steven Rostedt | 9be2441 | 2009-03-26 10:25:24 -0400 | [diff] [blame] | 413 | /* The task we are waiting for is waking up */ |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 414 | data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu); |
Steven Rostedt | 9be2441 | 2009-03-26 10:25:24 -0400 | [diff] [blame] | 415 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 416 | __trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc); |
Arnaldo Carvalho de Melo | 7be4215 | 2009-02-05 01:13:37 -0500 | [diff] [blame] | 417 | tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 418 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 419 | T0 = data->preempt_timestamp; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 420 | T1 = ftrace_now(cpu); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 421 | delta = T1-T0; |
| 422 | |
| 423 | if (!report_latency(delta)) |
| 424 | goto out_unlock; |
| 425 | |
Carsten Emde | b5130b1 | 2009-09-13 01:43:07 +0200 | [diff] [blame] | 426 | if (likely(!is_tracing_stopped())) { |
| 427 | tracing_max_latency = delta; |
| 428 | update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu); |
| 429 | } |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 430 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 431 | out_unlock: |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 432 | __wakeup_reset(wakeup_trace); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 433 | arch_spin_unlock(&wakeup_lock); |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 434 | local_irq_restore(flags); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 435 | out: |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 436 | atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 437 | } |
| 438 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 439 | static void __wakeup_reset(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 440 | { |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 441 | wakeup_cpu = -1; |
| 442 | wakeup_prio = -1; |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 443 | tracing_dl = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 444 | |
| 445 | if (wakeup_task) |
| 446 | put_task_struct(wakeup_task); |
| 447 | |
| 448 | wakeup_task = NULL; |
| 449 | } |
| 450 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 451 | static void wakeup_reset(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 452 | { |
| 453 | unsigned long flags; |
| 454 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 455 | tracing_reset_online_cpus(&tr->trace_buffer); |
Steven Rostedt | 2f26ebd | 2009-09-01 11:06:29 -0400 | [diff] [blame] | 456 | |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 457 | local_irq_save(flags); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 458 | arch_spin_lock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 459 | __wakeup_reset(tr); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 460 | arch_spin_unlock(&wakeup_lock); |
Steven Rostedt | e59494f | 2008-07-16 00:13:45 -0400 | [diff] [blame] | 461 | local_irq_restore(flags); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 462 | } |
| 463 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 464 | static void |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 465 | probe_wakeup(void *ignore, struct task_struct *p, int success) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 466 | { |
Steven Rostedt | f8ec106 | 2009-01-21 17:17:04 -0500 | [diff] [blame] | 467 | struct trace_array_cpu *data; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 468 | int cpu = smp_processor_id(); |
| 469 | unsigned long flags; |
| 470 | long disabled; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 471 | int pc; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 472 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 473 | if (likely(!tracer_enabled)) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 474 | return; |
| 475 | |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 476 | tracing_record_cmdline(p); |
| 477 | tracing_record_cmdline(current); |
| 478 | |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 479 | /* |
| 480 | * Semantic is like this: |
| 481 | * - wakeup tracer handles all tasks in the system, independently |
| 482 | * from their scheduling class; |
| 483 | * - wakeup_rt tracer handles tasks belonging to sched_dl and |
| 484 | * sched_rt class; |
| 485 | * - wakeup_dl handles tasks belonging to sched_dl class only. |
| 486 | */ |
| 487 | if (tracing_dl || (wakeup_dl && !dl_task(p)) || |
| 488 | (wakeup_rt && !dl_task(p) && !rt_task(p)) || |
| 489 | (!dl_task(p) && (p->prio >= wakeup_prio || p->prio >= current->prio))) |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 490 | return; |
| 491 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 492 | pc = preempt_count(); |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 493 | disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 494 | if (unlikely(disabled != 1)) |
| 495 | goto out; |
| 496 | |
| 497 | /* interrupts should be off from try_to_wake_up */ |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 498 | arch_spin_lock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 499 | |
| 500 | /* check for races. */ |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 501 | if (!tracer_enabled || tracing_dl || |
| 502 | (!dl_task(p) && p->prio >= wakeup_prio)) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 503 | goto out_locked; |
| 504 | |
| 505 | /* reset the trace */ |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 506 | __wakeup_reset(wakeup_trace); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 507 | |
| 508 | wakeup_cpu = task_cpu(p); |
Steven Rostedt | 478142c3 | 2009-09-09 10:36:01 -0400 | [diff] [blame] | 509 | wakeup_current_cpu = wakeup_cpu; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 510 | wakeup_prio = p->prio; |
| 511 | |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 512 | /* |
| 513 | * Once you start tracing a -deadline task, don't bother tracing |
| 514 | * another task until the first one wakes up. |
| 515 | */ |
| 516 | if (dl_task(p)) |
| 517 | tracing_dl = 1; |
| 518 | else |
| 519 | tracing_dl = 0; |
| 520 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 521 | wakeup_task = p; |
| 522 | get_task_struct(wakeup_task); |
| 523 | |
| 524 | local_save_flags(flags); |
| 525 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 526 | data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu); |
Steven Rostedt | f8ec106 | 2009-01-21 17:17:04 -0500 | [diff] [blame] | 527 | data->preempt_timestamp = ftrace_now(cpu); |
Arnaldo Carvalho de Melo | 7be4215 | 2009-02-05 01:13:37 -0500 | [diff] [blame] | 528 | tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc); |
Steven Rostedt | 301fd74 | 2009-04-03 11:12:23 -0400 | [diff] [blame] | 529 | |
| 530 | /* |
| 531 | * We must be careful in using CALLER_ADDR2. But since wake_up |
| 532 | * is not called by an assembly function (where as schedule is) |
| 533 | * it should be safe to use it here. |
| 534 | */ |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 535 | __trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 536 | |
| 537 | out_locked: |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 538 | arch_spin_unlock(&wakeup_lock); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 539 | out: |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 540 | atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 541 | } |
| 542 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 543 | static void start_wakeup_tracer(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 544 | { |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 545 | int ret; |
| 546 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 547 | ret = register_trace_sched_wakeup(probe_wakeup, NULL); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 548 | if (ret) { |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 549 | pr_info("wakeup trace: Couldn't activate tracepoint" |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 550 | " probe to kernel_sched_wakeup\n"); |
| 551 | return; |
| 552 | } |
| 553 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 554 | ret = register_trace_sched_wakeup_new(probe_wakeup, NULL); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 555 | if (ret) { |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 556 | pr_info("wakeup trace: Couldn't activate tracepoint" |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 557 | " probe to kernel_sched_wakeup_new\n"); |
| 558 | goto fail_deprobe; |
| 559 | } |
| 560 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 561 | ret = register_trace_sched_switch(probe_wakeup_sched_switch, NULL); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 562 | if (ret) { |
Mathieu Desnoyers | b07c3f1 | 2008-07-18 12:16:17 -0400 | [diff] [blame] | 563 | pr_info("sched trace: Couldn't activate tracepoint" |
Wenji Huang | 73d8b8b | 2009-02-17 01:10:02 -0500 | [diff] [blame] | 564 | " probe to kernel_sched_switch\n"); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 565 | goto fail_deprobe_wake_new; |
| 566 | } |
| 567 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 568 | ret = register_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); |
Steven Rostedt | 478142c3 | 2009-09-09 10:36:01 -0400 | [diff] [blame] | 569 | if (ret) { |
| 570 | pr_info("wakeup trace: Couldn't activate tracepoint" |
| 571 | " probe to kernel_sched_migrate_task\n"); |
| 572 | return; |
| 573 | } |
| 574 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 575 | wakeup_reset(tr); |
| 576 | |
| 577 | /* |
| 578 | * Don't let the tracer_enabled = 1 show up before |
| 579 | * the wakeup_task is reset. This may be overkill since |
| 580 | * wakeup_reset does a spin_unlock after setting the |
| 581 | * wakeup_task to NULL, but I want to be safe. |
| 582 | * This is a slow path anyway. |
| 583 | */ |
| 584 | smp_wmb(); |
| 585 | |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 586 | if (start_func_tracer(is_graph())) |
| 587 | printk(KERN_ERR "failed to start wakeup tracer\n"); |
Steven Rostedt | ad59124 | 2008-07-10 20:58:13 -0400 | [diff] [blame] | 588 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 589 | return; |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 590 | fail_deprobe_wake_new: |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 591 | unregister_trace_sched_wakeup_new(probe_wakeup, NULL); |
Mathieu Desnoyers | 5b82a1b | 2008-05-12 21:21:10 +0200 | [diff] [blame] | 592 | fail_deprobe: |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 593 | unregister_trace_sched_wakeup(probe_wakeup, NULL); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 594 | } |
| 595 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 596 | static void stop_wakeup_tracer(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 597 | { |
| 598 | tracer_enabled = 0; |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 599 | stop_func_tracer(is_graph()); |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 600 | unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL); |
| 601 | unregister_trace_sched_wakeup_new(probe_wakeup, NULL); |
| 602 | unregister_trace_sched_wakeup(probe_wakeup, NULL); |
| 603 | unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 604 | } |
| 605 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 606 | static int __wakeup_tracer_init(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 607 | { |
Steven Rostedt (Red Hat) | 613f04a | 2013-03-14 15:03:53 -0400 | [diff] [blame] | 608 | save_flags = trace_flags; |
| 609 | |
| 610 | /* non overwrite screws up the latency tracers */ |
Steven Rostedt | 2b6080f | 2012-05-11 13:29:49 -0400 | [diff] [blame] | 611 | set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); |
| 612 | set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1); |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 613 | |
Steven Rostedt | 745b162 | 2009-01-15 23:40:11 -0500 | [diff] [blame] | 614 | tracing_max_latency = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 615 | wakeup_trace = tr; |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 616 | start_wakeup_tracer(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 617 | return 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 618 | } |
| 619 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 620 | static int wakeup_tracer_init(struct trace_array *tr) |
| 621 | { |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 622 | wakeup_dl = 0; |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 623 | wakeup_rt = 0; |
| 624 | return __wakeup_tracer_init(tr); |
| 625 | } |
| 626 | |
| 627 | static int wakeup_rt_tracer_init(struct trace_array *tr) |
| 628 | { |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 629 | wakeup_dl = 0; |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 630 | wakeup_rt = 1; |
| 631 | return __wakeup_tracer_init(tr); |
| 632 | } |
| 633 | |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 634 | static int wakeup_dl_tracer_init(struct trace_array *tr) |
| 635 | { |
| 636 | wakeup_dl = 1; |
| 637 | wakeup_rt = 0; |
| 638 | return __wakeup_tracer_init(tr); |
| 639 | } |
| 640 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 641 | static void wakeup_tracer_reset(struct trace_array *tr) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 642 | { |
Steven Rostedt (Red Hat) | 613f04a | 2013-03-14 15:03:53 -0400 | [diff] [blame] | 643 | int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT; |
| 644 | int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE; |
| 645 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 646 | stop_wakeup_tracer(tr); |
| 647 | /* make sure we put back any tasks we are tracing */ |
| 648 | wakeup_reset(tr); |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 649 | |
Steven Rostedt | 2b6080f | 2012-05-11 13:29:49 -0400 | [diff] [blame] | 650 | set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag); |
| 651 | set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag); |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 652 | } |
| 653 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 654 | static void wakeup_tracer_start(struct trace_array *tr) |
| 655 | { |
| 656 | wakeup_reset(tr); |
| 657 | tracer_enabled = 1; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | static void wakeup_tracer_stop(struct trace_array *tr) |
| 661 | { |
| 662 | tracer_enabled = 0; |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 663 | } |
| 664 | |
| 665 | static struct tracer wakeup_tracer __read_mostly = |
| 666 | { |
| 667 | .name = "wakeup", |
| 668 | .init = wakeup_tracer_init, |
| 669 | .reset = wakeup_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 670 | .start = wakeup_tracer_start, |
| 671 | .stop = wakeup_tracer_stop, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 672 | .print_max = true, |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 673 | .print_header = wakeup_print_header, |
| 674 | .print_line = wakeup_print_line, |
| 675 | .flags = &tracer_flags, |
| 676 | .set_flag = wakeup_set_flag, |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 677 | .flag_changed = wakeup_flag_changed, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 678 | #ifdef CONFIG_FTRACE_SELFTEST |
| 679 | .selftest = trace_selftest_startup_wakeup, |
| 680 | #endif |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 681 | .open = wakeup_trace_open, |
| 682 | .close = wakeup_trace_close, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 683 | .use_max_tr = true, |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 684 | }; |
| 685 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 686 | static struct tracer wakeup_rt_tracer __read_mostly = |
| 687 | { |
| 688 | .name = "wakeup_rt", |
| 689 | .init = wakeup_rt_tracer_init, |
| 690 | .reset = wakeup_tracer_reset, |
| 691 | .start = wakeup_tracer_start, |
| 692 | .stop = wakeup_tracer_stop, |
Frederic Weisbecker | 6eaaa5d | 2009-02-11 02:25:00 +0100 | [diff] [blame] | 693 | .wait_pipe = poll_wait_pipe, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 694 | .print_max = true, |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 695 | .print_header = wakeup_print_header, |
| 696 | .print_line = wakeup_print_line, |
| 697 | .flags = &tracer_flags, |
| 698 | .set_flag = wakeup_set_flag, |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 699 | .flag_changed = wakeup_flag_changed, |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 700 | #ifdef CONFIG_FTRACE_SELFTEST |
| 701 | .selftest = trace_selftest_startup_wakeup, |
| 702 | #endif |
Jiri Olsa | 7495a5be | 2010-09-23 14:00:53 +0200 | [diff] [blame] | 703 | .open = wakeup_trace_open, |
| 704 | .close = wakeup_trace_close, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 705 | .use_max_tr = true, |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 706 | }; |
| 707 | |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 708 | static struct tracer wakeup_dl_tracer __read_mostly = |
| 709 | { |
| 710 | .name = "wakeup_dl", |
| 711 | .init = wakeup_dl_tracer_init, |
| 712 | .reset = wakeup_tracer_reset, |
| 713 | .start = wakeup_tracer_start, |
| 714 | .stop = wakeup_tracer_stop, |
| 715 | .wait_pipe = poll_wait_pipe, |
| 716 | .print_max = true, |
| 717 | .print_header = wakeup_print_header, |
| 718 | .print_line = wakeup_print_line, |
| 719 | .flags = &tracer_flags, |
| 720 | .set_flag = wakeup_set_flag, |
| 721 | .flag_changed = wakeup_flag_changed, |
| 722 | #ifdef CONFIG_FTRACE_SELFTEST |
| 723 | .selftest = trace_selftest_startup_wakeup, |
| 724 | #endif |
| 725 | .open = wakeup_trace_open, |
| 726 | .close = wakeup_trace_close, |
| 727 | .use_max_tr = true, |
| 728 | }; |
| 729 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 730 | __init static int init_wakeup_tracer(void) |
| 731 | { |
| 732 | int ret; |
| 733 | |
| 734 | ret = register_tracer(&wakeup_tracer); |
| 735 | if (ret) |
| 736 | return ret; |
| 737 | |
Steven Rostedt | 3244351 | 2009-01-21 16:24:46 -0500 | [diff] [blame] | 738 | ret = register_tracer(&wakeup_rt_tracer); |
| 739 | if (ret) |
| 740 | return ret; |
| 741 | |
Dario Faggioli | af6ace7 | 2013-11-07 14:43:42 +0100 | [diff] [blame] | 742 | ret = register_tracer(&wakeup_dl_tracer); |
| 743 | if (ret) |
| 744 | return ret; |
| 745 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 746 | return 0; |
| 747 | } |
Steven Rostedt | 6f41567 | 2012-10-05 12:13:07 -0400 | [diff] [blame] | 748 | core_initcall(init_wakeup_tracer); |