perf sched: Add support for sched:sched_stat_runtime events
This allows more precise 'perf sched latency' output: --------------------------------------------------------------------------------------- Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | --------------------------------------------------------------------------------------- ksoftirqd/0-4 | 0.010 ms | 2 | avg: 2.476 ms | max: 2.977 ms | perf-12328 | 15.844 ms | 66 | avg: 1.118 ms | max: 9.979 ms | bdi-default-235 | 0.009 ms | 1 | avg: 0.998 ms | max: 0.998 ms | events/1-8 | 0.020 ms | 2 | avg: 0.998 ms | max: 0.998 ms | events/0-7 | 0.018 ms | 2 | avg: 0.992 ms | max: 0.996 ms | sleep-12329 | 0.742 ms | 3 | avg: 0.906 ms | max: 2.289 ms | sshd-12122 | 0.163 ms | 2 | avg: 0.283 ms | max: 0.562 ms | loop-getpid-lon-12322 | 1023.636 ms | 69 | avg: 0.208 ms | max: 5.996 ms | loop-getpid-lon-12321 | 1038.638 ms | 5 | avg: 0.073 ms | max: 0.171 ms | migration/1-5 | 0.000 ms | 1 | avg: 0.006 ms | max: 0.006 ms | --------------------------------------------------------------------------------------- TOTAL: | 2079.078 ms | 153 | ------------------------------------------------- Also, streamline the code a bit more, add asserts for various state machine failures (they should be debugged if they occur) and fix a few odd ends. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
mingo
Ingo Molnar
parent
08f69e6c2e
commit
39aeb52f99
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@ -50,7 +50,7 @@ static u64 sleep_measurement_overhead;
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static unsigned long nr_tasks;
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struct sched_event;
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struct sched_atom;
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struct task_desc {
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unsigned long nr;
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@ -59,7 +59,7 @@ struct task_desc {
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unsigned long nr_events;
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unsigned long curr_event;
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struct sched_event **events;
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struct sched_atom **atoms;
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pthread_t thread;
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sem_t sleep_sem;
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@ -76,7 +76,7 @@ enum sched_event_type {
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SCHED_EVENT_WAKEUP,
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};
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struct sched_event {
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struct sched_atom {
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enum sched_event_type type;
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u64 timestamp;
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u64 duration;
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@ -137,8 +137,8 @@ struct work_atom {
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u64 runtime;
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};
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struct task_atoms {
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struct list_head atom_list;
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struct work_atoms {
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struct list_head work_list;
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struct thread *thread;
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struct rb_node node;
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u64 max_lat;
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@ -147,7 +147,7 @@ struct task_atoms {
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u64 total_runtime;
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};
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typedef int (*sort_fn_t)(struct task_atoms *, struct task_atoms *);
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typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
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static struct rb_root atom_root, sorted_atom_root;
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@ -220,10 +220,10 @@ static void calibrate_sleep_measurement_overhead(void)
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printf("sleep measurement overhead: %Ld nsecs\n", min_delta);
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}
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static struct sched_event *
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static struct sched_atom *
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get_new_event(struct task_desc *task, u64 timestamp)
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{
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struct sched_event *event = calloc(1, sizeof(*event));
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struct sched_atom *event = calloc(1, sizeof(*event));
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unsigned long idx = task->nr_events;
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size_t size;
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@ -231,27 +231,27 @@ get_new_event(struct task_desc *task, u64 timestamp)
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event->nr = idx;
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task->nr_events++;
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size = sizeof(struct sched_event *) * task->nr_events;
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task->events = realloc(task->events, size);
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BUG_ON(!task->events);
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size = sizeof(struct sched_atom *) * task->nr_events;
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task->atoms = realloc(task->atoms, size);
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BUG_ON(!task->atoms);
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task->events[idx] = event;
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task->atoms[idx] = event;
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return event;
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}
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static struct sched_event *last_event(struct task_desc *task)
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static struct sched_atom *last_event(struct task_desc *task)
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{
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if (!task->nr_events)
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return NULL;
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return task->events[task->nr_events - 1];
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return task->atoms[task->nr_events - 1];
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}
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static void
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add_sched_event_run(struct task_desc *task, u64 timestamp, u64 duration)
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{
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struct sched_event *event, *curr_event = last_event(task);
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struct sched_atom *event, *curr_event = last_event(task);
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/*
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* optimize an existing RUN event by merging this one
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@ -275,7 +275,7 @@ static void
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add_sched_event_wakeup(struct task_desc *task, u64 timestamp,
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struct task_desc *wakee)
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{
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struct sched_event *event, *wakee_event;
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struct sched_atom *event, *wakee_event;
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event = get_new_event(task, timestamp);
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event->type = SCHED_EVENT_WAKEUP;
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@ -303,7 +303,7 @@ static void
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add_sched_event_sleep(struct task_desc *task, u64 timestamp,
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u64 task_state __used)
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{
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struct sched_event *event = get_new_event(task, timestamp);
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struct sched_atom *event = get_new_event(task, timestamp);
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event->type = SCHED_EVENT_SLEEP;
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@ -372,27 +372,27 @@ static void add_cross_task_wakeups(void)
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}
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static void
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process_sched_event(struct task_desc *this_task __used, struct sched_event *event)
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process_sched_event(struct task_desc *this_task __used, struct sched_atom *atom)
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{
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int ret = 0;
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u64 now;
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long long delta;
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now = get_nsecs();
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delta = start_time + event->timestamp - now;
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delta = start_time + atom->timestamp - now;
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switch (event->type) {
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switch (atom->type) {
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case SCHED_EVENT_RUN:
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burn_nsecs(event->duration);
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burn_nsecs(atom->duration);
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break;
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case SCHED_EVENT_SLEEP:
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if (event->wait_sem)
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ret = sem_wait(event->wait_sem);
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if (atom->wait_sem)
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ret = sem_wait(atom->wait_sem);
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BUG_ON(ret);
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break;
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case SCHED_EVENT_WAKEUP:
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if (event->wait_sem)
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ret = sem_post(event->wait_sem);
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if (atom->wait_sem)
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ret = sem_post(atom->wait_sem);
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BUG_ON(ret);
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break;
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default:
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@ -467,7 +467,7 @@ again:
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for (i = 0; i < this_task->nr_events; i++) {
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this_task->curr_event = i;
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process_sched_event(this_task, this_task->events[i]);
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process_sched_event(this_task, this_task->atoms[i]);
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}
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cpu_usage_1 = get_cpu_usage_nsec_self();
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@ -649,7 +649,7 @@ static void __cmd_replay(void)
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if (multitarget_wakeups)
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printf("multi-target wakeups: %ld\n", multitarget_wakeups);
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if (nr_run_events_optimized)
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printf("run events optimized: %ld\n",
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printf("run atoms optimized: %ld\n",
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nr_run_events_optimized);
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print_task_traces();
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@ -727,6 +727,20 @@ struct trace_switch_event {
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u32 next_prio;
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};
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struct trace_runtime_event {
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u32 size;
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u16 common_type;
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u8 common_flags;
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u8 common_preempt_count;
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u32 common_pid;
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u32 common_tgid;
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char comm[16];
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u32 pid;
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u64 runtime;
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u64 vruntime;
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};
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struct trace_wakeup_event {
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u32 size;
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@ -767,6 +781,12 @@ struct trace_sched_handler {
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u64 timestamp,
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struct thread *thread);
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void (*runtime_event)(struct trace_runtime_event *,
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struct event *,
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int cpu,
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u64 timestamp,
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struct thread *thread);
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void (*wakeup_event)(struct trace_wakeup_event *,
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struct event *,
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int cpu,
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@ -881,7 +901,7 @@ struct sort_dimension {
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static LIST_HEAD(cmp_pid);
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static int
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thread_lat_cmp(struct list_head *list, struct task_atoms *l, struct task_atoms *r)
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thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
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{
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struct sort_dimension *sort;
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int ret = 0;
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@ -897,18 +917,18 @@ thread_lat_cmp(struct list_head *list, struct task_atoms *l, struct task_atoms *
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return ret;
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}
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static struct task_atoms *
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static struct work_atoms *
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thread_atoms_search(struct rb_root *root, struct thread *thread,
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struct list_head *sort_list)
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{
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struct rb_node *node = root->rb_node;
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struct task_atoms key = { .thread = thread };
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struct work_atoms key = { .thread = thread };
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while (node) {
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struct task_atoms *atoms;
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struct work_atoms *atoms;
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int cmp;
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atoms = container_of(node, struct task_atoms, node);
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atoms = container_of(node, struct work_atoms, node);
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cmp = thread_lat_cmp(sort_list, &key, atoms);
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if (cmp > 0)
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@ -924,16 +944,16 @@ thread_atoms_search(struct rb_root *root, struct thread *thread,
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}
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static void
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__thread_latency_insert(struct rb_root *root, struct task_atoms *data,
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__thread_latency_insert(struct rb_root *root, struct work_atoms *data,
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struct list_head *sort_list)
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{
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struct rb_node **new = &(root->rb_node), *parent = NULL;
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while (*new) {
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struct task_atoms *this;
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struct work_atoms *this;
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int cmp;
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this = container_of(*new, struct task_atoms, node);
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this = container_of(*new, struct work_atoms, node);
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parent = *new;
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cmp = thread_lat_cmp(sort_list, data, this);
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@ -950,14 +970,14 @@ __thread_latency_insert(struct rb_root *root, struct task_atoms *data,
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static void thread_atoms_insert(struct thread *thread)
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{
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struct task_atoms *atoms;
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struct work_atoms *atoms;
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atoms = calloc(sizeof(*atoms), 1);
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if (!atoms)
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die("No memory");
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atoms->thread = thread;
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INIT_LIST_HEAD(&atoms->atom_list);
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INIT_LIST_HEAD(&atoms->work_list);
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__thread_latency_insert(&atom_root, atoms, &cmp_pid);
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}
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@ -980,10 +1000,9 @@ static char sched_out_state(struct trace_switch_event *switch_event)
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}
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static void
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lat_sched_out(struct task_atoms *atoms,
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struct trace_switch_event *switch_event __used,
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u64 delta,
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u64 timestamp)
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add_sched_out_event(struct work_atoms *atoms,
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char run_state,
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u64 timestamp)
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{
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struct work_atom *atom;
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@ -993,25 +1012,37 @@ lat_sched_out(struct task_atoms *atoms,
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atom->sched_out_time = timestamp;
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if (sched_out_state(switch_event) == 'R') {
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if (run_state == 'R') {
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atom->state = THREAD_WAIT_CPU;
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atom->wake_up_time = atom->sched_out_time;
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}
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atom->runtime = delta;
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list_add_tail(&atom->list, &atoms->atom_list);
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list_add_tail(&atom->list, &atoms->work_list);
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}
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static void
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lat_sched_in(struct task_atoms *atoms, u64 timestamp)
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add_runtime_event(struct work_atoms *atoms, u64 delta, u64 timestamp __used)
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{
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struct work_atom *atom;
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BUG_ON(list_empty(&atoms->work_list));
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atom = list_entry(atoms->work_list.prev, struct work_atom, list);
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atom->runtime += delta;
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atoms->total_runtime += delta;
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}
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static void
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add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
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{
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struct work_atom *atom;
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u64 delta;
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if (list_empty(&atoms->atom_list))
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if (list_empty(&atoms->work_list))
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return;
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atom = list_entry(atoms->atom_list.prev, struct work_atom, list);
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atom = list_entry(atoms->work_list.prev, struct work_atom, list);
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if (atom->state != THREAD_WAIT_CPU)
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return;
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@ -1029,7 +1060,6 @@ lat_sched_in(struct task_atoms *atoms, u64 timestamp)
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if (delta > atoms->max_lat)
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atoms->max_lat = delta;
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atoms->nb_atoms++;
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atoms->total_runtime += atom->runtime;
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}
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static void
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@ -1039,13 +1069,12 @@ latency_switch_event(struct trace_switch_event *switch_event,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct task_atoms *out_atoms, *in_atoms;
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struct work_atoms *out_events, *in_events;
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struct thread *sched_out, *sched_in;
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u64 timestamp0;
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s64 delta;
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if (cpu >= MAX_CPUS || cpu < 0)
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return;
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BUG_ON(cpu >= MAX_CPUS || cpu < 0);
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timestamp0 = cpu_last_switched[cpu];
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cpu_last_switched[cpu] = timestamp;
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@ -1061,34 +1090,63 @@ latency_switch_event(struct trace_switch_event *switch_event,
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sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);
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sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);
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in_atoms = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
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if (!in_atoms) {
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thread_atoms_insert(sched_in);
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in_atoms = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
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if (!in_atoms)
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die("in-atom: Internal tree error");
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}
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out_atoms = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
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if (!out_atoms) {
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out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
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if (!out_events) {
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thread_atoms_insert(sched_out);
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out_atoms = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
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if (!out_atoms)
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die("out-atom: Internal tree error");
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out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
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if (!out_events)
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die("out-event: Internal tree error");
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}
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add_sched_out_event(out_events, sched_out_state(switch_event), timestamp);
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in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
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if (!in_events) {
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thread_atoms_insert(sched_in);
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in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
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if (!in_events)
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die("in-event: Internal tree error");
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/*
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* Take came in we have not heard about yet,
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* add in an initial atom in runnable state:
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*/
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add_sched_out_event(in_events, 'R', timestamp);
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}
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add_sched_in_event(in_events, timestamp);
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}
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static void
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latency_runtime_event(struct trace_runtime_event *runtime_event,
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struct event *event __used,
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int cpu,
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u64 timestamp,
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struct thread *this_thread __used)
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{
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struct work_atoms *atoms;
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struct thread *thread;
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BUG_ON(cpu >= MAX_CPUS || cpu < 0);
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thread = threads__findnew(runtime_event->pid, &threads, &last_match);
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atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
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if (!atoms) {
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thread_atoms_insert(thread);
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atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
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if (!atoms)
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die("in-event: Internal tree error");
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add_sched_out_event(atoms, 'R', timestamp);
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}
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lat_sched_in(in_atoms, timestamp);
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lat_sched_out(out_atoms, switch_event, delta, timestamp);
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add_runtime_event(atoms, runtime_event->runtime, timestamp);
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}
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static void
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latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
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struct event *event __used,
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struct event *__event __used,
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int cpu __used,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct task_atoms *atoms;
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struct work_atoms *atoms;
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struct work_atom *atom;
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struct thread *wakee;
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@ -1100,16 +1158,20 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
|
|||
atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
|
||||
if (!atoms) {
|
||||
thread_atoms_insert(wakee);
|
||||
return;
|
||||
atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
|
||||
if (!atoms)
|
||||
die("wakeup-event: Internal tree error");
|
||||
add_sched_out_event(atoms, 'S', timestamp);
|
||||
}
|
||||
|
||||
if (list_empty(&atoms->atom_list))
|
||||
return;
|
||||
BUG_ON(list_empty(&atoms->work_list));
|
||||
|
||||
atom = list_entry(atoms->atom_list.prev, struct work_atom, list);
|
||||
atom = list_entry(atoms->work_list.prev, struct work_atom, list);
|
||||
|
||||
if (atom->state != THREAD_SLEEPING)
|
||||
if (atom->state != THREAD_SLEEPING) {
|
||||
printf("boo2\n");
|
||||
return;
|
||||
}
|
||||
|
||||
nr_timestamps++;
|
||||
if (atom->sched_out_time > timestamp) {
|
||||
|
|
@ -1124,40 +1186,41 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
|
|||
static struct trace_sched_handler lat_ops = {
|
||||
.wakeup_event = latency_wakeup_event,
|
||||
.switch_event = latency_switch_event,
|
||||
.runtime_event = latency_runtime_event,
|
||||
.fork_event = latency_fork_event,
|
||||
};
|
||||
|
||||
static void output_lat_thread(struct task_atoms *atom_list)
|
||||
static void output_lat_thread(struct work_atoms *work_list)
|
||||
{
|
||||
int i;
|
||||
int ret;
|
||||
u64 avg;
|
||||
|
||||
if (!atom_list->nb_atoms)
|
||||
if (!work_list->nb_atoms)
|
||||
return;
|
||||
/*
|
||||
* Ignore idle threads:
|
||||
*/
|
||||
if (!atom_list->thread->pid)
|
||||
if (!work_list->thread->pid)
|
||||
return;
|
||||
|
||||
all_runtime += atom_list->total_runtime;
|
||||
all_count += atom_list->nb_atoms;
|
||||
all_runtime += work_list->total_runtime;
|
||||
all_count += work_list->nb_atoms;
|
||||
|
||||
ret = printf(" %s-%d ", atom_list->thread->comm, atom_list->thread->pid);
|
||||
ret = printf(" %s-%d ", work_list->thread->comm, work_list->thread->pid);
|
||||
|
||||
for (i = 0; i < 24 - ret; i++)
|
||||
printf(" ");
|
||||
|
||||
avg = atom_list->total_lat / atom_list->nb_atoms;
|
||||
avg = work_list->total_lat / work_list->nb_atoms;
|
||||
|
||||
printf("|%9.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms |\n",
|
||||
(double)atom_list->total_runtime / 1e6,
|
||||
atom_list->nb_atoms, (double)avg / 1e6,
|
||||
(double)atom_list->max_lat / 1e6);
|
||||
(double)work_list->total_runtime / 1e6,
|
||||
work_list->nb_atoms, (double)avg / 1e6,
|
||||
(double)work_list->max_lat / 1e6);
|
||||
}
|
||||
|
||||
static int pid_cmp(struct task_atoms *l, struct task_atoms *r)
|
||||
static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
|
||||
{
|
||||
if (l->thread->pid < r->thread->pid)
|
||||
return -1;
|
||||
|
|
@ -1172,7 +1235,7 @@ static struct sort_dimension pid_sort_dimension = {
|
|||
.cmp = pid_cmp,
|
||||
};
|
||||
|
||||
static int avg_cmp(struct task_atoms *l, struct task_atoms *r)
|
||||
static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
|
||||
{
|
||||
u64 avgl, avgr;
|
||||
|
||||
|
|
@ -1198,7 +1261,7 @@ static struct sort_dimension avg_sort_dimension = {
|
|||
.cmp = avg_cmp,
|
||||
};
|
||||
|
||||
static int max_cmp(struct task_atoms *l, struct task_atoms *r)
|
||||
static int max_cmp(struct work_atoms *l, struct work_atoms *r)
|
||||
{
|
||||
if (l->max_lat < r->max_lat)
|
||||
return -1;
|
||||
|
|
@ -1213,7 +1276,7 @@ static struct sort_dimension max_sort_dimension = {
|
|||
.cmp = max_cmp,
|
||||
};
|
||||
|
||||
static int switch_cmp(struct task_atoms *l, struct task_atoms *r)
|
||||
static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
|
||||
{
|
||||
if (l->nb_atoms < r->nb_atoms)
|
||||
return -1;
|
||||
|
|
@ -1228,7 +1291,7 @@ static struct sort_dimension switch_sort_dimension = {
|
|||
.cmp = switch_cmp,
|
||||
};
|
||||
|
||||
static int runtime_cmp(struct task_atoms *l, struct task_atoms *r)
|
||||
static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
|
||||
{
|
||||
if (l->total_runtime < r->total_runtime)
|
||||
return -1;
|
||||
|
|
@ -1277,13 +1340,13 @@ static void sort_lat(void)
|
|||
struct rb_node *node;
|
||||
|
||||
for (;;) {
|
||||
struct task_atoms *data;
|
||||
struct work_atoms *data;
|
||||
node = rb_first(&atom_root);
|
||||
if (!node)
|
||||
break;
|
||||
|
||||
rb_erase(node, &atom_root);
|
||||
data = rb_entry(node, struct task_atoms, node);
|
||||
data = rb_entry(node, struct work_atoms, node);
|
||||
__thread_latency_insert(&sorted_atom_root, data, &sort_list);
|
||||
}
|
||||
}
|
||||
|
|
@ -1303,10 +1366,10 @@ static void __cmd_lat(void)
|
|||
next = rb_first(&sorted_atom_root);
|
||||
|
||||
while (next) {
|
||||
struct task_atoms *atom_list;
|
||||
struct work_atoms *work_list;
|
||||
|
||||
atom_list = rb_entry(next, struct task_atoms, node);
|
||||
output_lat_thread(atom_list);
|
||||
work_list = rb_entry(next, struct work_atoms, node);
|
||||
output_lat_thread(work_list);
|
||||
next = rb_next(next);
|
||||
}
|
||||
|
||||
|
|
@ -1368,6 +1431,23 @@ process_sched_switch_event(struct raw_event_sample *raw,
|
|||
trace_handler->switch_event(&switch_event, event, cpu, timestamp, thread);
|
||||
}
|
||||
|
||||
static void
|
||||
process_sched_runtime_event(struct raw_event_sample *raw,
|
||||
struct event *event,
|
||||
int cpu __used,
|
||||
u64 timestamp __used,
|
||||
struct thread *thread __used)
|
||||
{
|
||||
struct trace_runtime_event runtime_event;
|
||||
|
||||
FILL_ARRAY(runtime_event, comm, event, raw->data);
|
||||
FILL_FIELD(runtime_event, pid, event, raw->data);
|
||||
FILL_FIELD(runtime_event, runtime, event, raw->data);
|
||||
FILL_FIELD(runtime_event, vruntime, event, raw->data);
|
||||
|
||||
trace_handler->runtime_event(&runtime_event, event, cpu, timestamp, thread);
|
||||
}
|
||||
|
||||
static void
|
||||
process_sched_fork_event(struct raw_event_sample *raw,
|
||||
struct event *event,
|
||||
|
|
@ -1410,6 +1490,8 @@ process_raw_event(event_t *raw_event __used, void *more_data,
|
|||
|
||||
if (!strcmp(event->name, "sched_switch"))
|
||||
process_sched_switch_event(raw, event, cpu, timestamp, thread);
|
||||
if (!strcmp(event->name, "sched_stat_runtime"))
|
||||
process_sched_runtime_event(raw, event, cpu, timestamp, thread);
|
||||
if (!strcmp(event->name, "sched_wakeup"))
|
||||
process_sched_wakeup_event(raw, event, cpu, timestamp, thread);
|
||||
if (!strcmp(event->name, "sched_wakeup_new"))
|
||||
|
|
|
|||
Reference in New Issue