| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | #undef TRACE_SYSTEM |
| 3 | #define TRACE_SYSTEM sched |
| 4 | |
| 5 | #if !defined(LTTNG_TRACE_SCHED_H) || defined(TRACE_HEADER_MULTI_READ) |
| 6 | #define LTTNG_TRACE_SCHED_H |
| 7 | |
| 8 | #include <probes/lttng-tracepoint-event.h> |
| 9 | #include <linux/sched.h> |
| 10 | #include <linux/pid_namespace.h> |
| 11 | #include <linux/binfmts.h> |
| 12 | #include <linux/sched/rt.h> |
| 13 | |
| 14 | #define LTTNG_MAX_PID_NS_LEVEL 32 |
| 15 | |
| 16 | #ifndef _TRACE_SCHED_DEF_ |
| 17 | #define _TRACE_SCHED_DEF_ |
| 18 | |
| 19 | static inline long __trace_sched_switch_state(bool preempt, struct task_struct *p) |
| 20 | { |
| 21 | unsigned int state; |
| 22 | |
| 23 | #ifdef CONFIG_SCHED_DEBUG |
| 24 | BUG_ON(p != current); |
| 25 | #endif /* CONFIG_SCHED_DEBUG */ |
| 26 | |
| 27 | /* |
| 28 | * Preemption ignores task state, therefore preempted tasks are always |
| 29 | * RUNNING (we will not have dequeued if state != RUNNING). |
| 30 | */ |
| 31 | if (preempt) |
| 32 | return TASK_REPORT_MAX; |
| 33 | |
| 34 | /* |
| 35 | * task_state_index() uses fls() and returns a value from 0-8 range. |
| 36 | * Decrement it by 1 (except TASK_RUNNING state i.e 0) before using |
| 37 | * it for left shift operation to get the correct task->state |
| 38 | * mapping. |
| 39 | */ |
| 40 | state = task_state_index(p); |
| 41 | |
| 42 | return state ? (1 << (state - 1)) : state; |
| 43 | } |
| 44 | |
| 45 | #endif /* _TRACE_SCHED_DEF_ */ |
| 46 | |
| 47 | /* |
| 48 | * Enumeration of the task state bitmask. |
| 49 | * Only bit flags are enumerated here, not composition of states. |
| 50 | */ |
| 51 | LTTNG_TRACEPOINT_ENUM(task_state, |
| 52 | TP_ENUM_VALUES( |
| 53 | ctf_enum_value("TASK_RUNNING", TASK_RUNNING) |
| 54 | ctf_enum_value("TASK_INTERRUPTIBLE", TASK_INTERRUPTIBLE) |
| 55 | ctf_enum_value("TASK_UNINTERRUPTIBLE", TASK_UNINTERRUPTIBLE) |
| 56 | ctf_enum_value("TASK_STOPPED", __TASK_STOPPED) |
| 57 | ctf_enum_value("TASK_TRACED", __TASK_TRACED) |
| 58 | ctf_enum_value("EXIT_DEAD", EXIT_DEAD) |
| 59 | ctf_enum_value("EXIT_ZOMBIE", EXIT_ZOMBIE) |
| 60 | ctf_enum_value("TASK_PARKED", TASK_PARKED) |
| 61 | ctf_enum_value("TASK_DEAD", TASK_DEAD) |
| 62 | ctf_enum_value("TASK_WAKEKILL", TASK_WAKEKILL) |
| 63 | ctf_enum_value("TASK_WAKING", TASK_WAKING) |
| 64 | ctf_enum_value("TASK_NOLOAD", TASK_NOLOAD) |
| 65 | ctf_enum_value("TASK_NEW", TASK_NEW) |
| 66 | ctf_enum_value("TASK_STATE_MAX", TASK_STATE_MAX) |
| 67 | ) |
| 68 | ) |
| 69 | |
| 70 | /* |
| 71 | * Tracepoint for calling kthread_stop, performed to end a kthread: |
| 72 | */ |
| 73 | LTTNG_TRACEPOINT_EVENT(sched_kthread_stop, |
| 74 | |
| 75 | TP_PROTO(struct task_struct *t), |
| 76 | |
| 77 | TP_ARGS(t), |
| 78 | |
| 79 | TP_FIELDS( |
| 80 | ctf_array_text(char, comm, t->comm, TASK_COMM_LEN) |
| 81 | ctf_integer(pid_t, tid, t->pid) |
| 82 | ) |
| 83 | ) |
| 84 | |
| 85 | /* |
| 86 | * Tracepoint for the return value of the kthread stopping: |
| 87 | */ |
| 88 | LTTNG_TRACEPOINT_EVENT(sched_kthread_stop_ret, |
| 89 | |
| 90 | TP_PROTO(int ret), |
| 91 | |
| 92 | TP_ARGS(ret), |
| 93 | |
| 94 | TP_FIELDS( |
| 95 | ctf_integer(int, ret, ret) |
| 96 | ) |
| 97 | ) |
| 98 | |
| 99 | /* |
| 100 | * Tracepoint for waking up a task: |
| 101 | */ |
| 102 | LTTNG_TRACEPOINT_EVENT_CLASS(sched_wakeup_template, |
| 103 | |
| 104 | TP_PROTO(struct task_struct *p), |
| 105 | |
| 106 | TP_ARGS(p), |
| 107 | |
| 108 | TP_FIELDS( |
| 109 | ctf_array_text(char, comm, p->comm, TASK_COMM_LEN) |
| 110 | ctf_integer(pid_t, tid, p->pid) |
| 111 | ctf_integer(int, prio, p->prio - MAX_RT_PRIO) |
| 112 | ctf_integer(int, target_cpu, task_cpu(p)) |
| 113 | ) |
| 114 | ) |
| 115 | |
| 116 | /* |
| 117 | * Tracepoint called when waking a task; this tracepoint is guaranteed to be |
| 118 | * called from the waking context. |
| 119 | */ |
| 120 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_wakeup_template, sched_waking, |
| 121 | TP_PROTO(struct task_struct *p), |
| 122 | TP_ARGS(p)) |
| 123 | |
| 124 | /* |
| 125 | * Tracepoint called when the task is actually woken; p->state == TASK_RUNNNG. |
| 126 | * It it not always called from the waking context. |
| 127 | */ |
| 128 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_wakeup_template, sched_wakeup, |
| 129 | TP_PROTO(struct task_struct *p), |
| 130 | TP_ARGS(p)) |
| 131 | |
| 132 | /* |
| 133 | * Tracepoint for waking up a new task: |
| 134 | */ |
| 135 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_wakeup_template, sched_wakeup_new, |
| 136 | TP_PROTO(struct task_struct *p), |
| 137 | TP_ARGS(p)) |
| 138 | |
| 139 | /* |
| 140 | * Tracepoint for task switches, performed by the scheduler: |
| 141 | */ |
| 142 | LTTNG_TRACEPOINT_EVENT(sched_switch, |
| 143 | |
| 144 | TP_PROTO(bool preempt, |
| 145 | struct task_struct *prev, |
| 146 | struct task_struct *next), |
| 147 | |
| 148 | TP_ARGS(preempt, prev, next), |
| 149 | |
| 150 | TP_FIELDS( |
| 151 | ctf_array_text(char, prev_comm, prev->comm, TASK_COMM_LEN) |
| 152 | ctf_integer(pid_t, prev_tid, prev->pid) |
| 153 | ctf_integer(int, prev_prio, prev->prio - MAX_RT_PRIO) |
| 154 | ctf_enum(task_state, long, prev_state, __trace_sched_switch_state(preempt, prev)) |
| 155 | ctf_array_text(char, next_comm, next->comm, TASK_COMM_LEN) |
| 156 | ctf_integer(pid_t, next_tid, next->pid) |
| 157 | ctf_integer(int, next_prio, next->prio - MAX_RT_PRIO) |
| 158 | ) |
| 159 | ) |
| 160 | |
| 161 | /* |
| 162 | * Tracepoint for a task being migrated: |
| 163 | */ |
| 164 | LTTNG_TRACEPOINT_EVENT(sched_migrate_task, |
| 165 | |
| 166 | TP_PROTO(struct task_struct *p, int dest_cpu), |
| 167 | |
| 168 | TP_ARGS(p, dest_cpu), |
| 169 | |
| 170 | TP_FIELDS( |
| 171 | ctf_array_text(char, comm, p->comm, TASK_COMM_LEN) |
| 172 | ctf_integer(pid_t, tid, p->pid) |
| 173 | ctf_integer(int, prio, p->prio - MAX_RT_PRIO) |
| 174 | ctf_integer(int, orig_cpu, task_cpu(p)) |
| 175 | ctf_integer(int, dest_cpu, dest_cpu) |
| 176 | ) |
| 177 | ) |
| 178 | |
| 179 | LTTNG_TRACEPOINT_EVENT_CLASS(sched_process_template, |
| 180 | |
| 181 | TP_PROTO(struct task_struct *p), |
| 182 | |
| 183 | TP_ARGS(p), |
| 184 | |
| 185 | TP_FIELDS( |
| 186 | ctf_array_text(char, comm, p->comm, TASK_COMM_LEN) |
| 187 | ctf_integer(pid_t, tid, p->pid) |
| 188 | ctf_integer(int, prio, p->prio - MAX_RT_PRIO) |
| 189 | ) |
| 190 | ) |
| 191 | |
| 192 | /* |
| 193 | * Tracepoint for freeing a task: |
| 194 | */ |
| 195 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_process_template, sched_process_free, |
| 196 | TP_PROTO(struct task_struct *p), |
| 197 | TP_ARGS(p)) |
| 198 | |
| 199 | |
| 200 | /* |
| 201 | * Tracepoint for a task exiting: |
| 202 | */ |
| 203 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_process_template, sched_process_exit, |
| 204 | TP_PROTO(struct task_struct *p), |
| 205 | TP_ARGS(p)) |
| 206 | |
| 207 | /* |
| 208 | * Tracepoint for waiting on task to unschedule: |
| 209 | */ |
| 210 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_process_template, sched_wait_task, |
| 211 | TP_PROTO(struct task_struct *p), |
| 212 | TP_ARGS(p)) |
| 213 | |
| 214 | /* |
| 215 | * Tracepoint for a waiting task: |
| 216 | */ |
| 217 | LTTNG_TRACEPOINT_EVENT(sched_process_wait, |
| 218 | |
| 219 | TP_PROTO(struct pid *pid), |
| 220 | |
| 221 | TP_ARGS(pid), |
| 222 | |
| 223 | TP_FIELDS( |
| 224 | ctf_array_text(char, comm, current->comm, TASK_COMM_LEN) |
| 225 | ctf_integer(pid_t, tid, pid_nr(pid)) |
| 226 | ctf_integer(int, prio, current->prio - MAX_RT_PRIO) |
| 227 | ) |
| 228 | ) |
| 229 | |
| 230 | /* |
| 231 | * Tracepoint for do_fork. |
| 232 | * Saving both TID and PID information, especially for the child, allows |
| 233 | * trace analyzers to distinguish between creation of a new process and |
| 234 | * creation of a new thread. Newly created processes will have child_tid |
| 235 | * == child_pid, while creation of a thread yields to child_tid != |
| 236 | * child_pid. |
| 237 | */ |
| 238 | LTTNG_TRACEPOINT_EVENT_CODE(sched_process_fork, |
| 239 | |
| 240 | TP_PROTO(struct task_struct *parent, struct task_struct *child), |
| 241 | |
| 242 | TP_ARGS(parent, child), |
| 243 | |
| 244 | TP_locvar( |
| 245 | pid_t vtids[LTTNG_MAX_PID_NS_LEVEL]; |
| 246 | unsigned int ns_level; |
| 247 | ), |
| 248 | |
| 249 | TP_code_pre( |
| 250 | if (child) { |
| 251 | struct pid *child_pid; |
| 252 | unsigned int i; |
| 253 | |
| 254 | child_pid = task_pid(child); |
| 255 | tp_locvar->ns_level = |
| 256 | min_t(unsigned int, child_pid->level + 1, |
| 257 | LTTNG_MAX_PID_NS_LEVEL); |
| 258 | for (i = 0; i < tp_locvar->ns_level; i++) |
| 259 | tp_locvar->vtids[i] = child_pid->numbers[i].nr; |
| 260 | } |
| 261 | ), |
| 262 | |
| 263 | TP_FIELDS( |
| 264 | ctf_array_text(char, parent_comm, parent->comm, TASK_COMM_LEN) |
| 265 | ctf_integer(pid_t, parent_tid, parent->pid) |
| 266 | ctf_integer(pid_t, parent_pid, parent->tgid) |
| 267 | ctf_integer(unsigned int, parent_ns_inum, |
| 268 | ({ |
| 269 | unsigned int parent_ns_inum = 0; |
| 270 | |
| 271 | if (parent) { |
| 272 | struct pid_namespace *pid_ns; |
| 273 | |
| 274 | pid_ns = task_active_pid_ns(parent); |
| 275 | if (pid_ns) |
| 276 | parent_ns_inum = |
| 277 | pid_ns->ns.inum; |
| 278 | } |
| 279 | parent_ns_inum; |
| 280 | })) |
| 281 | ctf_array_text(char, child_comm, child->comm, TASK_COMM_LEN) |
| 282 | ctf_integer(pid_t, child_tid, child->pid) |
| 283 | ctf_sequence(pid_t, vtids, tp_locvar->vtids, u8, tp_locvar->ns_level) |
| 284 | ctf_integer(pid_t, child_pid, child->tgid) |
| 285 | ctf_integer(unsigned int, child_ns_inum, |
| 286 | ({ |
| 287 | unsigned int child_ns_inum = 0; |
| 288 | |
| 289 | if (child) { |
| 290 | struct pid_namespace *pid_ns; |
| 291 | |
| 292 | pid_ns = task_active_pid_ns(child); |
| 293 | if (pid_ns) |
| 294 | child_ns_inum = |
| 295 | pid_ns->ns.inum; |
| 296 | } |
| 297 | child_ns_inum; |
| 298 | })) |
| 299 | ), |
| 300 | |
| 301 | TP_code_post() |
| 302 | ) |
| 303 | |
| 304 | /* |
| 305 | * Tracepoint for exec: |
| 306 | */ |
| 307 | LTTNG_TRACEPOINT_EVENT(sched_process_exec, |
| 308 | |
| 309 | TP_PROTO(struct task_struct *p, pid_t old_pid, |
| 310 | struct linux_binprm *bprm), |
| 311 | |
| 312 | TP_ARGS(p, old_pid, bprm), |
| 313 | |
| 314 | TP_FIELDS( |
| 315 | ctf_string(filename, bprm->filename) |
| 316 | ctf_integer(pid_t, tid, p->pid) |
| 317 | ctf_integer(pid_t, old_tid, old_pid) |
| 318 | ) |
| 319 | ) |
| 320 | |
| 321 | /* |
| 322 | * XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE |
| 323 | * adding sched_stat support to SCHED_FIFO/RR would be welcome. |
| 324 | */ |
| 325 | LTTNG_TRACEPOINT_EVENT_CLASS(sched_stat_template, |
| 326 | |
| 327 | TP_PROTO(struct task_struct *tsk, u64 delay), |
| 328 | |
| 329 | TP_ARGS(tsk, delay), |
| 330 | |
| 331 | TP_FIELDS( |
| 332 | ctf_array_text(char, comm, tsk->comm, TASK_COMM_LEN) |
| 333 | ctf_integer(pid_t, tid, tsk->pid) |
| 334 | ctf_integer(u64, delay, delay) |
| 335 | ) |
| 336 | ) |
| 337 | |
| 338 | |
| 339 | /* |
| 340 | * Tracepoint for accounting wait time (time the task is runnable |
| 341 | * but not actually running due to scheduler contention). |
| 342 | */ |
| 343 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_stat_template, sched_stat_wait, |
| 344 | TP_PROTO(struct task_struct *tsk, u64 delay), |
| 345 | TP_ARGS(tsk, delay)) |
| 346 | |
| 347 | /* |
| 348 | * Tracepoint for accounting sleep time (time the task is not runnable, |
| 349 | * including iowait, see below). |
| 350 | */ |
| 351 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_stat_template, sched_stat_sleep, |
| 352 | TP_PROTO(struct task_struct *tsk, u64 delay), |
| 353 | TP_ARGS(tsk, delay)) |
| 354 | |
| 355 | /* |
| 356 | * Tracepoint for accounting iowait time (time the task is not runnable |
| 357 | * due to waiting on IO to complete). |
| 358 | */ |
| 359 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_stat_template, sched_stat_iowait, |
| 360 | TP_PROTO(struct task_struct *tsk, u64 delay), |
| 361 | TP_ARGS(tsk, delay)) |
| 362 | |
| 363 | /* |
| 364 | * Tracepoint for accounting blocked time (time the task is in uninterruptible). |
| 365 | */ |
| 366 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_stat_template, sched_stat_blocked, |
| 367 | TP_PROTO(struct task_struct *tsk, u64 delay), |
| 368 | TP_ARGS(tsk, delay)) |
| 369 | |
| 370 | /* |
| 371 | * Tracepoint for accounting runtime (time the task is executing |
| 372 | * on a CPU). |
| 373 | */ |
| 374 | LTTNG_TRACEPOINT_EVENT(sched_stat_runtime, |
| 375 | |
| 376 | TP_PROTO(struct task_struct *tsk, u64 runtime, u64 vruntime), |
| 377 | |
| 378 | TP_ARGS(tsk, runtime, vruntime), |
| 379 | |
| 380 | TP_FIELDS( |
| 381 | ctf_array_text(char, comm, tsk->comm, TASK_COMM_LEN) |
| 382 | ctf_integer(pid_t, tid, tsk->pid) |
| 383 | ctf_integer(u64, runtime, runtime) |
| 384 | ctf_integer(u64, vruntime, vruntime) |
| 385 | ) |
| 386 | ) |
| 387 | |
| 388 | /* |
| 389 | * Tracepoint for showing priority inheritance modifying a tasks |
| 390 | * priority. |
| 391 | */ |
| 392 | LTTNG_TRACEPOINT_EVENT(sched_pi_setprio, |
| 393 | |
| 394 | TP_PROTO(struct task_struct *tsk, struct task_struct *pi_task), |
| 395 | |
| 396 | TP_ARGS(tsk, pi_task), |
| 397 | |
| 398 | TP_FIELDS( |
| 399 | ctf_array_text(char, comm, tsk->comm, TASK_COMM_LEN) |
| 400 | ctf_integer(pid_t, tid, tsk->pid) |
| 401 | ctf_integer(int, oldprio, tsk->prio - MAX_RT_PRIO) |
| 402 | ctf_integer(int, newprio, pi_task ? pi_task->prio - MAX_RT_PRIO : tsk->prio - MAX_RT_PRIO) |
| 403 | ) |
| 404 | ) |
| 405 | |
| 406 | #endif /* LTTNG_TRACE_SCHED_H */ |
| 407 | |
| 408 | /* This part must be outside protection */ |
| 409 | #include <probes/define_trace.h> |