--- /dev/null
+#include "builtin.h"
+#include "perf.h"
+
+#include "util/util.h"
+#include "util/evlist.h"
+#include "util/cache.h"
+#include "util/evsel.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+#include "util/header.h"
+#include "util/session.h"
+#include "util/tool.h"
+#include "util/cloexec.h"
+
+#include "util/parse-options.h"
+#include "util/trace-event.h"
+
+#include "util/debug.h"
+
+#include <sys/prctl.h>
+#include <sys/resource.h>
+
+#include <semaphore.h>
+#include <pthread.h>
+#include <math.h>
+#include <api/fs/fs.h>
+
+#define PR_SET_NAME 15 /* Set process name */
+#define MAX_CPUS 4096
+#define COMM_LEN 20
+#define SYM_LEN 129
+#define MAX_PID 1024000
+
+struct sched_atom;
+
+struct task_desc {
+ unsigned long nr;
+ unsigned long pid;
+ char comm[COMM_LEN];
+
+ unsigned long nr_events;
+ unsigned long curr_event;
+ struct sched_atom **atoms;
+
+ pthread_t thread;
+ sem_t sleep_sem;
+
+ sem_t ready_for_work;
+ sem_t work_done_sem;
+
+ u64 cpu_usage;
+};
+
+enum sched_event_type {
+ SCHED_EVENT_RUN,
+ SCHED_EVENT_SLEEP,
+ SCHED_EVENT_WAKEUP,
+ SCHED_EVENT_MIGRATION,
+};
+
+struct sched_atom {
+ enum sched_event_type type;
+ int specific_wait;
+ u64 timestamp;
+ u64 duration;
+ unsigned long nr;
+ sem_t *wait_sem;
+ struct task_desc *wakee;
+};
+
+#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
+
+enum thread_state {
+ THREAD_SLEEPING = 0,
+ THREAD_WAIT_CPU,
+ THREAD_SCHED_IN,
+ THREAD_IGNORE
+};
+
+struct work_atom {
+ struct list_head list;
+ enum thread_state state;
+ u64 sched_out_time;
+ u64 wake_up_time;
+ u64 sched_in_time;
+ u64 runtime;
+};
+
+struct work_atoms {
+ struct list_head work_list;
+ struct thread *thread;
+ struct rb_node node;
+ u64 max_lat;
+ u64 max_lat_at;
+ u64 total_lat;
+ u64 nb_atoms;
+ u64 total_runtime;
+};
+
+typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
+
+struct perf_sched;
+
+struct trace_sched_handler {
+ int (*switch_event)(struct perf_sched *sched, struct perf_evsel *evsel,
+ struct perf_sample *sample, struct machine *machine);
+
+ int (*runtime_event)(struct perf_sched *sched, struct perf_evsel *evsel,
+ struct perf_sample *sample, struct machine *machine);
+
+ int (*wakeup_event)(struct perf_sched *sched, struct perf_evsel *evsel,
+ struct perf_sample *sample, struct machine *machine);
+
+ /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
+ int (*fork_event)(struct perf_sched *sched, union perf_event *event,
+ struct machine *machine);
+
+ int (*migrate_task_event)(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine);
+};
+
+struct perf_sched {
+ struct perf_tool tool;
+ const char *sort_order;
+ unsigned long nr_tasks;
+ struct task_desc **pid_to_task;
+ struct task_desc **tasks;
+ const struct trace_sched_handler *tp_handler;
+ pthread_mutex_t start_work_mutex;
+ pthread_mutex_t work_done_wait_mutex;
+ int profile_cpu;
+/*
+ * Track the current task - that way we can know whether there's any
+ * weird events, such as a task being switched away that is not current.
+ */
+ int max_cpu;
+ u32 curr_pid[MAX_CPUS];
+ struct thread *curr_thread[MAX_CPUS];
+ char next_shortname1;
+ char next_shortname2;
+ unsigned int replay_repeat;
+ unsigned long nr_run_events;
+ unsigned long nr_sleep_events;
+ unsigned long nr_wakeup_events;
+ unsigned long nr_sleep_corrections;
+ unsigned long nr_run_events_optimized;
+ unsigned long targetless_wakeups;
+ unsigned long multitarget_wakeups;
+ unsigned long nr_runs;
+ unsigned long nr_timestamps;
+ unsigned long nr_unordered_timestamps;
+ unsigned long nr_context_switch_bugs;
+ unsigned long nr_events;
+ unsigned long nr_lost_chunks;
+ unsigned long nr_lost_events;
+ u64 run_measurement_overhead;
+ u64 sleep_measurement_overhead;
+ u64 start_time;
+ u64 cpu_usage;
+ u64 runavg_cpu_usage;
+ u64 parent_cpu_usage;
+ u64 runavg_parent_cpu_usage;
+ u64 sum_runtime;
+ u64 sum_fluct;
+ u64 run_avg;
+ u64 all_runtime;
+ u64 all_count;
+ u64 cpu_last_switched[MAX_CPUS];
+ struct rb_root atom_root, sorted_atom_root;
+ struct list_head sort_list, cmp_pid;
+ bool force;
+};
+
+static u64 get_nsecs(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+
+ return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+}
+
+static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
+{
+ u64 T0 = get_nsecs(), T1;
+
+ do {
+ T1 = get_nsecs();
+ } while (T1 + sched->run_measurement_overhead < T0 + nsecs);
+}
+
+static void sleep_nsecs(u64 nsecs)
+{
+ struct timespec ts;
+
+ ts.tv_nsec = nsecs % 999999999;
+ ts.tv_sec = nsecs / 999999999;
+
+ nanosleep(&ts, NULL);
+}
+
+static void calibrate_run_measurement_overhead(struct perf_sched *sched)
+{
+ u64 T0, T1, delta, min_delta = 1000000000ULL;
+ int i;
+
+ for (i = 0; i < 10; i++) {
+ T0 = get_nsecs();
+ burn_nsecs(sched, 0);
+ T1 = get_nsecs();
+ delta = T1-T0;
+ min_delta = min(min_delta, delta);
+ }
+ sched->run_measurement_overhead = min_delta;
+
+ printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
+}
+
+static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
+{
+ u64 T0, T1, delta, min_delta = 1000000000ULL;
+ int i;
+
+ for (i = 0; i < 10; i++) {
+ T0 = get_nsecs();
+ sleep_nsecs(10000);
+ T1 = get_nsecs();
+ delta = T1-T0;
+ min_delta = min(min_delta, delta);
+ }
+ min_delta -= 10000;
+ sched->sleep_measurement_overhead = min_delta;
+
+ printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
+}
+
+static struct sched_atom *
+get_new_event(struct task_desc *task, u64 timestamp)
+{
+ struct sched_atom *event = zalloc(sizeof(*event));
+ unsigned long idx = task->nr_events;
+ size_t size;
+
+ event->timestamp = timestamp;
+ event->nr = idx;
+
+ task->nr_events++;
+ size = sizeof(struct sched_atom *) * task->nr_events;
+ task->atoms = realloc(task->atoms, size);
+ BUG_ON(!task->atoms);
+
+ task->atoms[idx] = event;
+
+ return event;
+}
+
+static struct sched_atom *last_event(struct task_desc *task)
+{
+ if (!task->nr_events)
+ return NULL;
+
+ return task->atoms[task->nr_events - 1];
+}
+
+static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
+ u64 timestamp, u64 duration)
+{
+ struct sched_atom *event, *curr_event = last_event(task);
+
+ /*
+ * optimize an existing RUN event by merging this one
+ * to it:
+ */
+ if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
+ sched->nr_run_events_optimized++;
+ curr_event->duration += duration;
+ return;
+ }
+
+ event = get_new_event(task, timestamp);
+
+ event->type = SCHED_EVENT_RUN;
+ event->duration = duration;
+
+ sched->nr_run_events++;
+}
+
+static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
+ u64 timestamp, struct task_desc *wakee)
+{
+ struct sched_atom *event, *wakee_event;
+
+ event = get_new_event(task, timestamp);
+ event->type = SCHED_EVENT_WAKEUP;
+ event->wakee = wakee;
+
+ wakee_event = last_event(wakee);
+ if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
+ sched->targetless_wakeups++;
+ return;
+ }
+ if (wakee_event->wait_sem) {
+ sched->multitarget_wakeups++;
+ return;
+ }
+
+ wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
+ sem_init(wakee_event->wait_sem, 0, 0);
+ wakee_event->specific_wait = 1;
+ event->wait_sem = wakee_event->wait_sem;
+
+ sched->nr_wakeup_events++;
+}
+
+static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
+ u64 timestamp, u64 task_state __maybe_unused)
+{
+ struct sched_atom *event = get_new_event(task, timestamp);
+
+ event->type = SCHED_EVENT_SLEEP;
+
+ sched->nr_sleep_events++;
+}
+
+static struct task_desc *register_pid(struct perf_sched *sched,
+ unsigned long pid, const char *comm)
+{
+ struct task_desc *task;
+ static int pid_max;
+
+ if (sched->pid_to_task == NULL) {
+ if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
+ pid_max = MAX_PID;
+ BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
+ }
+ if (pid >= (unsigned long)pid_max) {
+ BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
+ sizeof(struct task_desc *))) == NULL);
+ while (pid >= (unsigned long)pid_max)
+ sched->pid_to_task[pid_max++] = NULL;
+ }
+
+ task = sched->pid_to_task[pid];
+
+ if (task)
+ return task;
+
+ task = zalloc(sizeof(*task));
+ task->pid = pid;
+ task->nr = sched->nr_tasks;
+ strcpy(task->comm, comm);
+ /*
+ * every task starts in sleeping state - this gets ignored
+ * if there's no wakeup pointing to this sleep state:
+ */
+ add_sched_event_sleep(sched, task, 0, 0);
+
+ sched->pid_to_task[pid] = task;
+ sched->nr_tasks++;
+ sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
+ BUG_ON(!sched->tasks);
+ sched->tasks[task->nr] = task;
+
+ if (verbose)
+ printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
+
+ return task;
+}
+
+
+static void print_task_traces(struct perf_sched *sched)
+{
+ struct task_desc *task;
+ unsigned long i;
+
+ for (i = 0; i < sched->nr_tasks; i++) {
+ task = sched->tasks[i];
+ printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
+ task->nr, task->comm, task->pid, task->nr_events);
+ }
+}
+
+static void add_cross_task_wakeups(struct perf_sched *sched)
+{
+ struct task_desc *task1, *task2;
+ unsigned long i, j;
+
+ for (i = 0; i < sched->nr_tasks; i++) {
+ task1 = sched->tasks[i];
+ j = i + 1;
+ if (j == sched->nr_tasks)
+ j = 0;
+ task2 = sched->tasks[j];
+ add_sched_event_wakeup(sched, task1, 0, task2);
+ }
+}
+
+static void perf_sched__process_event(struct perf_sched *sched,
+ struct sched_atom *atom)
+{
+ int ret = 0;
+
+ switch (atom->type) {
+ case SCHED_EVENT_RUN:
+ burn_nsecs(sched, atom->duration);
+ break;
+ case SCHED_EVENT_SLEEP:
+ if (atom->wait_sem)
+ ret = sem_wait(atom->wait_sem);
+ BUG_ON(ret);
+ break;
+ case SCHED_EVENT_WAKEUP:
+ if (atom->wait_sem)
+ ret = sem_post(atom->wait_sem);
+ BUG_ON(ret);
+ break;
+ case SCHED_EVENT_MIGRATION:
+ break;
+ default:
+ BUG_ON(1);
+ }
+}
+
+static u64 get_cpu_usage_nsec_parent(void)
+{
+ struct rusage ru;
+ u64 sum;
+ int err;
+
+ err = getrusage(RUSAGE_SELF, &ru);
+ BUG_ON(err);
+
+ sum = ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
+ sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
+
+ return sum;
+}
+
+static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
+{
+ struct perf_event_attr attr;
+ char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
+ int fd;
+ struct rlimit limit;
+ bool need_privilege = false;
+
+ memset(&attr, 0, sizeof(attr));
+
+ attr.type = PERF_TYPE_SOFTWARE;
+ attr.config = PERF_COUNT_SW_TASK_CLOCK;
+
+force_again:
+ fd = sys_perf_event_open(&attr, 0, -1, -1,
+ perf_event_open_cloexec_flag());
+
+ if (fd < 0) {
+ if (errno == EMFILE) {
+ if (sched->force) {
+ BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
+ limit.rlim_cur += sched->nr_tasks - cur_task;
+ if (limit.rlim_cur > limit.rlim_max) {
+ limit.rlim_max = limit.rlim_cur;
+ need_privilege = true;
+ }
+ if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
+ if (need_privilege && errno == EPERM)
+ strcpy(info, "Need privilege\n");
+ } else
+ goto force_again;
+ } else
+ strcpy(info, "Have a try with -f option\n");
+ }
+ pr_err("Error: sys_perf_event_open() syscall returned "
+ "with %d (%s)\n%s", fd,
+ strerror_r(errno, sbuf, sizeof(sbuf)), info);
+ exit(EXIT_FAILURE);
+ }
+ return fd;
+}
+
+static u64 get_cpu_usage_nsec_self(int fd)
+{
+ u64 runtime;
+ int ret;
+
+ ret = read(fd, &runtime, sizeof(runtime));
+ BUG_ON(ret != sizeof(runtime));
+
+ return runtime;
+}
+
+struct sched_thread_parms {
+ struct task_desc *task;
+ struct perf_sched *sched;
+ int fd;
+};
+
+static void *thread_func(void *ctx)
+{
+ struct sched_thread_parms *parms = ctx;
+ struct task_desc *this_task = parms->task;
+ struct perf_sched *sched = parms->sched;
+ u64 cpu_usage_0, cpu_usage_1;
+ unsigned long i, ret;
+ char comm2[22];
+ int fd = parms->fd;
+
+ zfree(&parms);
+
+ sprintf(comm2, ":%s", this_task->comm);
+ prctl(PR_SET_NAME, comm2);
+ if (fd < 0)
+ return NULL;
+again:
+ ret = sem_post(&this_task->ready_for_work);
+ BUG_ON(ret);
+ ret = pthread_mutex_lock(&sched->start_work_mutex);
+ BUG_ON(ret);
+ ret = pthread_mutex_unlock(&sched->start_work_mutex);
+ BUG_ON(ret);
+
+ cpu_usage_0 = get_cpu_usage_nsec_self(fd);
+
+ for (i = 0; i < this_task->nr_events; i++) {
+ this_task->curr_event = i;
+ perf_sched__process_event(sched, this_task->atoms[i]);
+ }
+
+ cpu_usage_1 = get_cpu_usage_nsec_self(fd);
+ this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
+ ret = sem_post(&this_task->work_done_sem);
+ BUG_ON(ret);
+
+ ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
+ BUG_ON(ret);
+ ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
+ BUG_ON(ret);
+
+ goto again;
+}
+
+static void create_tasks(struct perf_sched *sched)
+{
+ struct task_desc *task;
+ pthread_attr_t attr;
+ unsigned long i;
+ int err;
+
+ err = pthread_attr_init(&attr);
+ BUG_ON(err);
+ err = pthread_attr_setstacksize(&attr,
+ (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
+ BUG_ON(err);
+ err = pthread_mutex_lock(&sched->start_work_mutex);
+ BUG_ON(err);
+ err = pthread_mutex_lock(&sched->work_done_wait_mutex);
+ BUG_ON(err);
+ for (i = 0; i < sched->nr_tasks; i++) {
+ struct sched_thread_parms *parms = malloc(sizeof(*parms));
+ BUG_ON(parms == NULL);
+ parms->task = task = sched->tasks[i];
+ parms->sched = sched;
+ parms->fd = self_open_counters(sched, i);
+ sem_init(&task->sleep_sem, 0, 0);
+ sem_init(&task->ready_for_work, 0, 0);
+ sem_init(&task->work_done_sem, 0, 0);
+ task->curr_event = 0;
+ err = pthread_create(&task->thread, &attr, thread_func, parms);
+ BUG_ON(err);
+ }
+}
+
+static void wait_for_tasks(struct perf_sched *sched)
+{
+ u64 cpu_usage_0, cpu_usage_1;
+ struct task_desc *task;
+ unsigned long i, ret;
+
+ sched->start_time = get_nsecs();
+ sched->cpu_usage = 0;
+ pthread_mutex_unlock(&sched->work_done_wait_mutex);
+
+ for (i = 0; i < sched->nr_tasks; i++) {
+ task = sched->tasks[i];
+ ret = sem_wait(&task->ready_for_work);
+ BUG_ON(ret);
+ sem_init(&task->ready_for_work, 0, 0);
+ }
+ ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
+ BUG_ON(ret);
+
+ cpu_usage_0 = get_cpu_usage_nsec_parent();
+
+ pthread_mutex_unlock(&sched->start_work_mutex);
+
+ for (i = 0; i < sched->nr_tasks; i++) {
+ task = sched->tasks[i];
+ ret = sem_wait(&task->work_done_sem);
+ BUG_ON(ret);
+ sem_init(&task->work_done_sem, 0, 0);
+ sched->cpu_usage += task->cpu_usage;
+ task->cpu_usage = 0;
+ }
+
+ cpu_usage_1 = get_cpu_usage_nsec_parent();
+ if (!sched->runavg_cpu_usage)
+ sched->runavg_cpu_usage = sched->cpu_usage;
+ sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
+
+ sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
+ if (!sched->runavg_parent_cpu_usage)
+ sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
+ sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
+ sched->parent_cpu_usage)/sched->replay_repeat;
+
+ ret = pthread_mutex_lock(&sched->start_work_mutex);
+ BUG_ON(ret);
+
+ for (i = 0; i < sched->nr_tasks; i++) {
+ task = sched->tasks[i];
+ sem_init(&task->sleep_sem, 0, 0);
+ task->curr_event = 0;
+ }
+}
+
+static void run_one_test(struct perf_sched *sched)
+{
+ u64 T0, T1, delta, avg_delta, fluct;
+
+ T0 = get_nsecs();
+ wait_for_tasks(sched);
+ T1 = get_nsecs();
+
+ delta = T1 - T0;
+ sched->sum_runtime += delta;
+ sched->nr_runs++;
+
+ avg_delta = sched->sum_runtime / sched->nr_runs;
+ if (delta < avg_delta)
+ fluct = avg_delta - delta;
+ else
+ fluct = delta - avg_delta;
+ sched->sum_fluct += fluct;
+ if (!sched->run_avg)
+ sched->run_avg = delta;
+ sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
+
+ printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / 1000000.0);
+
+ printf("ravg: %0.2f, ", (double)sched->run_avg / 1e6);
+
+ printf("cpu: %0.2f / %0.2f",
+ (double)sched->cpu_usage / 1e6, (double)sched->runavg_cpu_usage / 1e6);
+
+#if 0
+ /*
+ * rusage statistics done by the parent, these are less
+ * accurate than the sched->sum_exec_runtime based statistics:
+ */
+ printf(" [%0.2f / %0.2f]",
+ (double)sched->parent_cpu_usage/1e6,
+ (double)sched->runavg_parent_cpu_usage/1e6);
+#endif
+
+ printf("\n");
+
+ if (sched->nr_sleep_corrections)
+ printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
+ sched->nr_sleep_corrections = 0;
+}
+
+static void test_calibrations(struct perf_sched *sched)
+{
+ u64 T0, T1;
+
+ T0 = get_nsecs();
+ burn_nsecs(sched, 1e6);
+ T1 = get_nsecs();
+
+ printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
+
+ T0 = get_nsecs();
+ sleep_nsecs(1e6);
+ T1 = get_nsecs();
+
+ printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
+}
+
+static int
+replay_wakeup_event(struct perf_sched *sched,
+ struct perf_evsel *evsel, struct perf_sample *sample,
+ struct machine *machine __maybe_unused)
+{
+ const char *comm = perf_evsel__strval(evsel, sample, "comm");
+ const u32 pid = perf_evsel__intval(evsel, sample, "pid");
+ struct task_desc *waker, *wakee;
+
+ if (verbose) {
+ printf("sched_wakeup event %p\n", evsel);
+
+ printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
+ }
+
+ waker = register_pid(sched, sample->tid, "<unknown>");
+ wakee = register_pid(sched, pid, comm);
+
+ add_sched_event_wakeup(sched, waker, sample->time, wakee);
+ return 0;
+}
+
+static int replay_switch_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine __maybe_unused)
+{
+ const char *prev_comm = perf_evsel__strval(evsel, sample, "prev_comm"),
+ *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
+ const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
+ next_pid = perf_evsel__intval(evsel, sample, "next_pid");
+ const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
+ struct task_desc *prev, __maybe_unused *next;
+ u64 timestamp0, timestamp = sample->time;
+ int cpu = sample->cpu;
+ s64 delta;
+
+ if (verbose)
+ printf("sched_switch event %p\n", evsel);
+
+ if (cpu >= MAX_CPUS || cpu < 0)
+ return 0;
+
+ timestamp0 = sched->cpu_last_switched[cpu];
+ if (timestamp0)
+ delta = timestamp - timestamp0;
+ else
+ delta = 0;
+
+ if (delta < 0) {
+ pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
+ return -1;
+ }
+
+ pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
+ prev_comm, prev_pid, next_comm, next_pid, delta);
+
+ prev = register_pid(sched, prev_pid, prev_comm);
+ next = register_pid(sched, next_pid, next_comm);
+
+ sched->cpu_last_switched[cpu] = timestamp;
+
+ add_sched_event_run(sched, prev, timestamp, delta);
+ add_sched_event_sleep(sched, prev, timestamp, prev_state);
+
+ return 0;
+}
+
+static int replay_fork_event(struct perf_sched *sched,
+ union perf_event *event,
+ struct machine *machine)
+{
+ struct thread *child, *parent;
+
+ child = machine__findnew_thread(machine, event->fork.pid,
+ event->fork.tid);
+ parent = machine__findnew_thread(machine, event->fork.ppid,
+ event->fork.ptid);
+
+ if (child == NULL || parent == NULL) {
+ pr_debug("thread does not exist on fork event: child %p, parent %p\n",
+ child, parent);
+ return 0;
+ }
+
+ if (verbose) {
+ printf("fork event\n");
+ printf("... parent: %s/%d\n", thread__comm_str(parent), parent->tid);
+ printf("... child: %s/%d\n", thread__comm_str(child), child->tid);
+ }
+
+ register_pid(sched, parent->tid, thread__comm_str(parent));
+ register_pid(sched, child->tid, thread__comm_str(child));
+ return 0;
+}
+
+struct sort_dimension {
+ const char *name;
+ sort_fn_t cmp;
+ struct list_head list;
+};
+
+static int
+thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
+{
+ struct sort_dimension *sort;
+ int ret = 0;
+
+ BUG_ON(list_empty(list));
+
+ list_for_each_entry(sort, list, list) {
+ ret = sort->cmp(l, r);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static struct work_atoms *
+thread_atoms_search(struct rb_root *root, struct thread *thread,
+ struct list_head *sort_list)
+{
+ struct rb_node *node = root->rb_node;
+ struct work_atoms key = { .thread = thread };
+
+ while (node) {
+ struct work_atoms *atoms;
+ int cmp;
+
+ atoms = container_of(node, struct work_atoms, node);
+
+ cmp = thread_lat_cmp(sort_list, &key, atoms);
+ if (cmp > 0)
+ node = node->rb_left;
+ else if (cmp < 0)
+ node = node->rb_right;
+ else {
+ BUG_ON(thread != atoms->thread);
+ return atoms;
+ }
+ }
+ return NULL;
+}
+
+static void
+__thread_latency_insert(struct rb_root *root, struct work_atoms *data,
+ struct list_head *sort_list)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+
+ while (*new) {
+ struct work_atoms *this;
+ int cmp;
+
+ this = container_of(*new, struct work_atoms, node);
+ parent = *new;
+
+ cmp = thread_lat_cmp(sort_list, data, this);
+
+ if (cmp > 0)
+ new = &((*new)->rb_left);
+ else
+ new = &((*new)->rb_right);
+ }
+
+ rb_link_node(&data->node, parent, new);
+ rb_insert_color(&data->node, root);
+}
+
+static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
+{
+ struct work_atoms *atoms = zalloc(sizeof(*atoms));
+ if (!atoms) {
+ pr_err("No memory at %s\n", __func__);
+ return -1;
+ }
+
+ atoms->thread = thread__get(thread);
+ INIT_LIST_HEAD(&atoms->work_list);
+ __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
+ return 0;
+}
+
+static char sched_out_state(u64 prev_state)
+{
+ const char *str = TASK_STATE_TO_CHAR_STR;
+
+ return str[prev_state];
+}
+
+static int
+add_sched_out_event(struct work_atoms *atoms,
+ char run_state,
+ u64 timestamp)
+{
+ struct work_atom *atom = zalloc(sizeof(*atom));
+ if (!atom) {
+ pr_err("Non memory at %s", __func__);
+ return -1;
+ }
+
+ atom->sched_out_time = timestamp;
+
+ if (run_state == 'R') {
+ atom->state = THREAD_WAIT_CPU;
+ atom->wake_up_time = atom->sched_out_time;
+ }
+
+ list_add_tail(&atom->list, &atoms->work_list);
+ return 0;
+}
+
+static void
+add_runtime_event(struct work_atoms *atoms, u64 delta,
+ u64 timestamp __maybe_unused)
+{
+ struct work_atom *atom;
+
+ BUG_ON(list_empty(&atoms->work_list));
+
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);
+
+ atom->runtime += delta;
+ atoms->total_runtime += delta;
+}
+
+static void
+add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
+{
+ struct work_atom *atom;
+ u64 delta;
+
+ if (list_empty(&atoms->work_list))
+ return;
+
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);
+
+ if (atom->state != THREAD_WAIT_CPU)
+ return;
+
+ if (timestamp < atom->wake_up_time) {
+ atom->state = THREAD_IGNORE;
+ return;
+ }
+
+ atom->state = THREAD_SCHED_IN;
+ atom->sched_in_time = timestamp;
+
+ delta = atom->sched_in_time - atom->wake_up_time;
+ atoms->total_lat += delta;
+ if (delta > atoms->max_lat) {
+ atoms->max_lat = delta;
+ atoms->max_lat_at = timestamp;
+ }
+ atoms->nb_atoms++;
+}
+
+static int latency_switch_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ const u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
+ next_pid = perf_evsel__intval(evsel, sample, "next_pid");
+ const u64 prev_state = perf_evsel__intval(evsel, sample, "prev_state");
+ struct work_atoms *out_events, *in_events;
+ struct thread *sched_out, *sched_in;
+ u64 timestamp0, timestamp = sample->time;
+ int cpu = sample->cpu;
+ s64 delta;
+
+ BUG_ON(cpu >= MAX_CPUS || cpu < 0);
+
+ timestamp0 = sched->cpu_last_switched[cpu];
+ sched->cpu_last_switched[cpu] = timestamp;
+ if (timestamp0)
+ delta = timestamp - timestamp0;
+ else
+ delta = 0;
+
+ if (delta < 0) {
+ pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
+ return -1;
+ }
+
+ sched_out = machine__findnew_thread(machine, -1, prev_pid);
+ sched_in = machine__findnew_thread(machine, -1, next_pid);
+
+ out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
+ if (!out_events) {
+ if (thread_atoms_insert(sched, sched_out))
+ return -1;
+ out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
+ if (!out_events) {
+ pr_err("out-event: Internal tree error");
+ return -1;
+ }
+ }
+ if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
+ return -1;
+
+ in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
+ if (!in_events) {
+ if (thread_atoms_insert(sched, sched_in))
+ return -1;
+ in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
+ if (!in_events) {
+ pr_err("in-event: Internal tree error");
+ return -1;
+ }
+ /*
+ * Take came in we have not heard about yet,
+ * add in an initial atom in runnable state:
+ */
+ if (add_sched_out_event(in_events, 'R', timestamp))
+ return -1;
+ }
+ add_sched_in_event(in_events, timestamp);
+
+ return 0;
+}
+
+static int latency_runtime_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ const u32 pid = perf_evsel__intval(evsel, sample, "pid");
+ const u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
+ struct thread *thread = machine__findnew_thread(machine, -1, pid);
+ struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
+ u64 timestamp = sample->time;
+ int cpu = sample->cpu;
+
+ BUG_ON(cpu >= MAX_CPUS || cpu < 0);
+ if (!atoms) {
+ if (thread_atoms_insert(sched, thread))
+ return -1;
+ atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
+ if (!atoms) {
+ pr_err("in-event: Internal tree error");
+ return -1;
+ }
+ if (add_sched_out_event(atoms, 'R', timestamp))
+ return -1;
+ }
+
+ add_runtime_event(atoms, runtime, timestamp);
+ return 0;
+}
+
+static int latency_wakeup_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ const u32 pid = perf_evsel__intval(evsel, sample, "pid");
+ struct work_atoms *atoms;
+ struct work_atom *atom;
+ struct thread *wakee;
+ u64 timestamp = sample->time;
+
+ wakee = machine__findnew_thread(machine, -1, pid);
+ atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
+ if (!atoms) {
+ if (thread_atoms_insert(sched, wakee))
+ return -1;
+ atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
+ if (!atoms) {
+ pr_err("wakeup-event: Internal tree error");
+ return -1;
+ }
+ if (add_sched_out_event(atoms, 'S', timestamp))
+ return -1;
+ }
+
+ BUG_ON(list_empty(&atoms->work_list));
+
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);
+
+ /*
+ * As we do not guarantee the wakeup event happens when
+ * task is out of run queue, also may happen when task is
+ * on run queue and wakeup only change ->state to TASK_RUNNING,
+ * then we should not set the ->wake_up_time when wake up a
+ * task which is on run queue.
+ *
+ * You WILL be missing events if you've recorded only
+ * one CPU, or are only looking at only one, so don't
+ * skip in this case.
+ */
+ if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
+ return 0;
+
+ sched->nr_timestamps++;
+ if (atom->sched_out_time > timestamp) {
+ sched->nr_unordered_timestamps++;
+ return 0;
+ }
+
+ atom->state = THREAD_WAIT_CPU;
+ atom->wake_up_time = timestamp;
+ return 0;
+}
+
+static int latency_migrate_task_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ const u32 pid = perf_evsel__intval(evsel, sample, "pid");
+ u64 timestamp = sample->time;
+ struct work_atoms *atoms;
+ struct work_atom *atom;
+ struct thread *migrant;
+
+ /*
+ * Only need to worry about migration when profiling one CPU.
+ */
+ if (sched->profile_cpu == -1)
+ return 0;
+
+ migrant = machine__findnew_thread(machine, -1, pid);
+ atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
+ if (!atoms) {
+ if (thread_atoms_insert(sched, migrant))
+ return -1;
+ register_pid(sched, migrant->tid, thread__comm_str(migrant));
+ atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
+ if (!atoms) {
+ pr_err("migration-event: Internal tree error");
+ return -1;
+ }
+ if (add_sched_out_event(atoms, 'R', timestamp))
+ return -1;
+ }
+
+ BUG_ON(list_empty(&atoms->work_list));
+
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);
+ atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
+
+ sched->nr_timestamps++;
+
+ if (atom->sched_out_time > timestamp)
+ sched->nr_unordered_timestamps++;
+
+ return 0;
+}
+
+static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
+{
+ int i;
+ int ret;
+ u64 avg;
+
+ if (!work_list->nb_atoms)
+ return;
+ /*
+ * Ignore idle threads:
+ */
+ if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
+ return;
+
+ sched->all_runtime += work_list->total_runtime;
+ sched->all_count += work_list->nb_atoms;
+
+ ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
+
+ for (i = 0; i < 24 - ret; i++)
+ printf(" ");
+
+ avg = work_list->total_lat / work_list->nb_atoms;
+
+ printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13.6f s\n",
+ (double)work_list->total_runtime / 1e6,
+ work_list->nb_atoms, (double)avg / 1e6,
+ (double)work_list->max_lat / 1e6,
+ (double)work_list->max_lat_at / 1e9);
+}
+
+static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
+{
+ if (l->thread->tid < r->thread->tid)
+ return -1;
+ if (l->thread->tid > r->thread->tid)
+ return 1;
+
+ return 0;
+}
+
+static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
+{
+ u64 avgl, avgr;
+
+ if (!l->nb_atoms)
+ return -1;
+
+ if (!r->nb_atoms)
+ return 1;
+
+ avgl = l->total_lat / l->nb_atoms;
+ avgr = r->total_lat / r->nb_atoms;
+
+ if (avgl < avgr)
+ return -1;
+ if (avgl > avgr)
+ return 1;
+
+ return 0;
+}
+
+static int max_cmp(struct work_atoms *l, struct work_atoms *r)
+{
+ if (l->max_lat < r->max_lat)
+ return -1;
+ if (l->max_lat > r->max_lat)
+ return 1;
+
+ return 0;
+}
+
+static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
+{
+ if (l->nb_atoms < r->nb_atoms)
+ return -1;
+ if (l->nb_atoms > r->nb_atoms)
+ return 1;
+
+ return 0;
+}
+
+static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
+{
+ if (l->total_runtime < r->total_runtime)
+ return -1;
+ if (l->total_runtime > r->total_runtime)
+ return 1;
+
+ return 0;
+}
+
+static int sort_dimension__add(const char *tok, struct list_head *list)
+{
+ size_t i;
+ static struct sort_dimension avg_sort_dimension = {
+ .name = "avg",
+ .cmp = avg_cmp,
+ };
+ static struct sort_dimension max_sort_dimension = {
+ .name = "max",
+ .cmp = max_cmp,
+ };
+ static struct sort_dimension pid_sort_dimension = {
+ .name = "pid",
+ .cmp = pid_cmp,
+ };
+ static struct sort_dimension runtime_sort_dimension = {
+ .name = "runtime",
+ .cmp = runtime_cmp,
+ };
+ static struct sort_dimension switch_sort_dimension = {
+ .name = "switch",
+ .cmp = switch_cmp,
+ };
+ struct sort_dimension *available_sorts[] = {
+ &pid_sort_dimension,
+ &avg_sort_dimension,
+ &max_sort_dimension,
+ &switch_sort_dimension,
+ &runtime_sort_dimension,
+ };
+
+ for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
+ if (!strcmp(available_sorts[i]->name, tok)) {
+ list_add_tail(&available_sorts[i]->list, list);
+
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+static void perf_sched__sort_lat(struct perf_sched *sched)
+{
+ struct rb_node *node;
+
+ for (;;) {
+ struct work_atoms *data;
+ node = rb_first(&sched->atom_root);
+ if (!node)
+ break;
+
+ rb_erase(node, &sched->atom_root);
+ data = rb_entry(node, struct work_atoms, node);
+ __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
+ }
+}
+
+static int process_sched_wakeup_event(struct perf_tool *tool,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+
+ if (sched->tp_handler->wakeup_event)
+ return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
+
+ return 0;
+}
+
+static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
+ struct perf_sample *sample, struct machine *machine)
+{
+ const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
+ struct thread *sched_in;
+ int new_shortname;
+ u64 timestamp0, timestamp = sample->time;
+ s64 delta;
+ int cpu, this_cpu = sample->cpu;
+
+ BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
+
+ if (this_cpu > sched->max_cpu)
+ sched->max_cpu = this_cpu;
+
+ timestamp0 = sched->cpu_last_switched[this_cpu];
+ sched->cpu_last_switched[this_cpu] = timestamp;
+ if (timestamp0)
+ delta = timestamp - timestamp0;
+ else
+ delta = 0;
+
+ if (delta < 0) {
+ pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
+ return -1;
+ }
+
+ sched_in = machine__findnew_thread(machine, -1, next_pid);
+
+ sched->curr_thread[this_cpu] = sched_in;
+
+ printf(" ");
+
+ new_shortname = 0;
+ if (!sched_in->shortname[0]) {
+ if (!strcmp(thread__comm_str(sched_in), "swapper")) {
+ /*
+ * Don't allocate a letter-number for swapper:0
+ * as a shortname. Instead, we use '.' for it.
+ */
+ sched_in->shortname[0] = '.';
+ sched_in->shortname[1] = ' ';
+ } else {
+ sched_in->shortname[0] = sched->next_shortname1;
+ sched_in->shortname[1] = sched->next_shortname2;
+
+ if (sched->next_shortname1 < 'Z') {
+ sched->next_shortname1++;
+ } else {
+ sched->next_shortname1 = 'A';
+ if (sched->next_shortname2 < '9')
+ sched->next_shortname2++;
+ else
+ sched->next_shortname2 = '0';
+ }
+ }
+ new_shortname = 1;
+ }
+
+ for (cpu = 0; cpu <= sched->max_cpu; cpu++) {
+ if (cpu != this_cpu)
+ printf(" ");
+ else
+ printf("*");
+
+ if (sched->curr_thread[cpu])
+ printf("%2s ", sched->curr_thread[cpu]->shortname);
+ else
+ printf(" ");
+ }
+
+ printf(" %12.6f secs ", (double)timestamp/1e9);
+ if (new_shortname) {
+ printf("%s => %s:%d\n",
+ sched_in->shortname, thread__comm_str(sched_in), sched_in->tid);
+ } else {
+ printf("\n");
+ }
+
+ return 0;
+}
+
+static int process_sched_switch_event(struct perf_tool *tool,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+ int this_cpu = sample->cpu, err = 0;
+ u32 prev_pid = perf_evsel__intval(evsel, sample, "prev_pid"),
+ next_pid = perf_evsel__intval(evsel, sample, "next_pid");
+
+ if (sched->curr_pid[this_cpu] != (u32)-1) {
+ /*
+ * Are we trying to switch away a PID that is
+ * not current?
+ */
+ if (sched->curr_pid[this_cpu] != prev_pid)
+ sched->nr_context_switch_bugs++;
+ }
+
+ if (sched->tp_handler->switch_event)
+ err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
+
+ sched->curr_pid[this_cpu] = next_pid;
+ return err;
+}
+
+static int process_sched_runtime_event(struct perf_tool *tool,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+
+ if (sched->tp_handler->runtime_event)
+ return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
+
+ return 0;
+}
+
+static int perf_sched__process_fork_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+
+ /* run the fork event through the perf machineruy */
+ perf_event__process_fork(tool, event, sample, machine);
+
+ /* and then run additional processing needed for this command */
+ if (sched->tp_handler->fork_event)
+ return sched->tp_handler->fork_event(sched, event, machine);
+
+ return 0;
+}
+
+static int process_sched_migrate_task_event(struct perf_tool *tool,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+
+ if (sched->tp_handler->migrate_task_event)
+ return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
+
+ return 0;
+}
+
+typedef int (*tracepoint_handler)(struct perf_tool *tool,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine);
+
+static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_unused,
+ union perf_event *event __maybe_unused,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel,
+ struct machine *machine)
+{
+ int err = 0;
+
+ if (evsel->handler != NULL) {
+ tracepoint_handler f = evsel->handler;
+ err = f(tool, evsel, sample, machine);
+ }
+
+ return err;
+}
+
+static int perf_sched__read_events(struct perf_sched *sched)
+{
+ const struct perf_evsel_str_handler handlers[] = {
+ { "sched:sched_switch", process_sched_switch_event, },
+ { "sched:sched_stat_runtime", process_sched_runtime_event, },
+ { "sched:sched_wakeup", process_sched_wakeup_event, },
+ { "sched:sched_wakeup_new", process_sched_wakeup_event, },
+ { "sched:sched_migrate_task", process_sched_migrate_task_event, },
+ };
+ struct perf_session *session;
+ struct perf_data_file file = {
+ .path = input_name,
+ .mode = PERF_DATA_MODE_READ,
+ .force = sched->force,
+ };
+ int rc = -1;
+
+ session = perf_session__new(&file, false, &sched->tool);
+ if (session == NULL) {
+ pr_debug("No Memory for session\n");
+ return -1;
+ }
+
+ symbol__init(&session->header.env);
+
+ if (perf_session__set_tracepoints_handlers(session, handlers))
+ goto out_delete;
+
+ if (perf_session__has_traces(session, "record -R")) {
+ int err = perf_session__process_events(session);
+ if (err) {
+ pr_err("Failed to process events, error %d", err);
+ goto out_delete;
+ }
+
+ sched->nr_events = session->evlist->stats.nr_events[0];
+ sched->nr_lost_events = session->evlist->stats.total_lost;
+ sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
+ }
+
+ rc = 0;
+out_delete:
+ perf_session__delete(session);
+ return rc;
+}
+
+static void print_bad_events(struct perf_sched *sched)
+{
+ if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
+ printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
+ (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
+ sched->nr_unordered_timestamps, sched->nr_timestamps);
+ }
+ if (sched->nr_lost_events && sched->nr_events) {
+ printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
+ (double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
+ sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
+ }
+ if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
+ printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
+ (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
+ sched->nr_context_switch_bugs, sched->nr_timestamps);
+ if (sched->nr_lost_events)
+ printf(" (due to lost events?)");
+ printf("\n");
+ }
+}
+
+static int perf_sched__lat(struct perf_sched *sched)
+{
+ struct rb_node *next;
+
+ setup_pager();
+
+ if (perf_sched__read_events(sched))
+ return -1;
+
+ perf_sched__sort_lat(sched);
+
+ printf("\n -----------------------------------------------------------------------------------------------------------------\n");
+ printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Maximum delay at |\n");
+ printf(" -----------------------------------------------------------------------------------------------------------------\n");
+
+ next = rb_first(&sched->sorted_atom_root);
+
+ while (next) {
+ struct work_atoms *work_list;
+
+ work_list = rb_entry(next, struct work_atoms, node);
+ output_lat_thread(sched, work_list);
+ next = rb_next(next);
+ thread__zput(work_list->thread);
+ }
+
+ printf(" -----------------------------------------------------------------------------------------------------------------\n");
+ printf(" TOTAL: |%11.3f ms |%9" PRIu64 " |\n",
+ (double)sched->all_runtime / 1e6, sched->all_count);
+
+ printf(" ---------------------------------------------------\n");
+
+ print_bad_events(sched);
+ printf("\n");
+
+ return 0;
+}
+
+static int perf_sched__map(struct perf_sched *sched)
+{
+ sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
+
+ setup_pager();
+ if (perf_sched__read_events(sched))
+ return -1;
+ print_bad_events(sched);
+ return 0;
+}
+
+static int perf_sched__replay(struct perf_sched *sched)
+{
+ unsigned long i;
+
+ calibrate_run_measurement_overhead(sched);
+ calibrate_sleep_measurement_overhead(sched);
+
+ test_calibrations(sched);
+
+ if (perf_sched__read_events(sched))
+ return -1;
+
+ printf("nr_run_events: %ld\n", sched->nr_run_events);
+ printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
+ printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events);
+
+ if (sched->targetless_wakeups)
+ printf("target-less wakeups: %ld\n", sched->targetless_wakeups);
+ if (sched->multitarget_wakeups)
+ printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
+ if (sched->nr_run_events_optimized)
+ printf("run atoms optimized: %ld\n",
+ sched->nr_run_events_optimized);
+
+ print_task_traces(sched);
+ add_cross_task_wakeups(sched);
+
+ create_tasks(sched);
+ printf("------------------------------------------------------------\n");
+ for (i = 0; i < sched->replay_repeat; i++)
+ run_one_test(sched);
+
+ return 0;
+}
+
+static void setup_sorting(struct perf_sched *sched, const struct option *options,
+ const char * const usage_msg[])
+{
+ char *tmp, *tok, *str = strdup(sched->sort_order);
+
+ for (tok = strtok_r(str, ", ", &tmp);
+ tok; tok = strtok_r(NULL, ", ", &tmp)) {
+ if (sort_dimension__add(tok, &sched->sort_list) < 0) {
+ error("Unknown --sort key: `%s'", tok);
+ usage_with_options(usage_msg, options);
+ }
+ }
+
+ free(str);
+
+ sort_dimension__add("pid", &sched->cmp_pid);
+}
+
+static int __cmd_record(int argc, const char **argv)
+{
+ unsigned int rec_argc, i, j;
+ const char **rec_argv;
+ const char * const record_args[] = {
+ "record",
+ "-a",
+ "-R",
+ "-m", "1024",
+ "-c", "1",
+ "-e", "sched:sched_switch",
+ "-e", "sched:sched_stat_wait",
+ "-e", "sched:sched_stat_sleep",
+ "-e", "sched:sched_stat_iowait",
+ "-e", "sched:sched_stat_runtime",
+ "-e", "sched:sched_process_fork",
+ "-e", "sched:sched_wakeup",
+ "-e", "sched:sched_wakeup_new",
+ "-e", "sched:sched_migrate_task",
+ };
+
+ rec_argc = ARRAY_SIZE(record_args) + argc - 1;
+ rec_argv = calloc(rec_argc + 1, sizeof(char *));
+
+ if (rec_argv == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(record_args); i++)
+ rec_argv[i] = strdup(record_args[i]);
+
+ for (j = 1; j < (unsigned int)argc; j++, i++)
+ rec_argv[i] = argv[j];
+
+ BUG_ON(i != rec_argc);
+
+ return cmd_record(i, rec_argv, NULL);
+}
+
+int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
+{
+ const char default_sort_order[] = "avg, max, switch, runtime";
+ struct perf_sched sched = {
+ .tool = {
+ .sample = perf_sched__process_tracepoint_sample,
+ .comm = perf_event__process_comm,
+ .lost = perf_event__process_lost,
+ .fork = perf_sched__process_fork_event,
+ .ordered_events = true,
+ },
+ .cmp_pid = LIST_HEAD_INIT(sched.cmp_pid),
+ .sort_list = LIST_HEAD_INIT(sched.sort_list),
+ .start_work_mutex = PTHREAD_MUTEX_INITIALIZER,
+ .work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
+ .sort_order = default_sort_order,
+ .replay_repeat = 10,
+ .profile_cpu = -1,
+ .next_shortname1 = 'A',
+ .next_shortname2 = '0',
+ };
+ const struct option latency_options[] = {
+ OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
+ "sort by key(s): runtime, switch, avg, max"),
+ OPT_INCR('v', "verbose", &verbose,
+ "be more verbose (show symbol address, etc)"),
+ OPT_INTEGER('C', "CPU", &sched.profile_cpu,
+ "CPU to profile on"),
+ OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
+ "dump raw trace in ASCII"),
+ OPT_END()
+ };
+ const struct option replay_options[] = {
+ OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
+ "repeat the workload replay N times (-1: infinite)"),
+ OPT_INCR('v', "verbose", &verbose,
+ "be more verbose (show symbol address, etc)"),
+ OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
+ "dump raw trace in ASCII"),
+ OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
+ OPT_END()
+ };
+ const struct option sched_options[] = {
+ OPT_STRING('i', "input", &input_name, "file",
+ "input file name"),
+ OPT_INCR('v', "verbose", &verbose,
+ "be more verbose (show symbol address, etc)"),
+ OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
+ "dump raw trace in ASCII"),
+ OPT_END()
+ };
+ const char * const latency_usage[] = {
+ "perf sched latency [<options>]",
+ NULL
+ };
+ const char * const replay_usage[] = {
+ "perf sched replay [<options>]",
+ NULL
+ };
+ const char *const sched_subcommands[] = { "record", "latency", "map",
+ "replay", "script", NULL };
+ const char *sched_usage[] = {
+ NULL,
+ NULL
+ };
+ struct trace_sched_handler lat_ops = {
+ .wakeup_event = latency_wakeup_event,
+ .switch_event = latency_switch_event,
+ .runtime_event = latency_runtime_event,
+ .migrate_task_event = latency_migrate_task_event,
+ };
+ struct trace_sched_handler map_ops = {
+ .switch_event = map_switch_event,
+ };
+ struct trace_sched_handler replay_ops = {
+ .wakeup_event = replay_wakeup_event,
+ .switch_event = replay_switch_event,
+ .fork_event = replay_fork_event,
+ };
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(sched.curr_pid); i++)
+ sched.curr_pid[i] = -1;
+
+ argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
+ sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
+ if (!argc)
+ usage_with_options(sched_usage, sched_options);
+
+ /*
+ * Aliased to 'perf script' for now:
+ */
+ if (!strcmp(argv[0], "script"))
+ return cmd_script(argc, argv, prefix);
+
+ if (!strncmp(argv[0], "rec", 3)) {
+ return __cmd_record(argc, argv);
+ } else if (!strncmp(argv[0], "lat", 3)) {
+ sched.tp_handler = &lat_ops;
+ if (argc > 1) {
+ argc = parse_options(argc, argv, latency_options, latency_usage, 0);
+ if (argc)
+ usage_with_options(latency_usage, latency_options);
+ }
+ setup_sorting(&sched, latency_options, latency_usage);
+ return perf_sched__lat(&sched);
+ } else if (!strcmp(argv[0], "map")) {
+ sched.tp_handler = &map_ops;
+ setup_sorting(&sched, latency_options, latency_usage);
+ return perf_sched__map(&sched);
+ } else if (!strncmp(argv[0], "rep", 3)) {
+ sched.tp_handler = &replay_ops;
+ if (argc) {
+ argc = parse_options(argc, argv, replay_options, replay_usage, 0);
+ if (argc)
+ usage_with_options(replay_usage, replay_options);
+ }
+ return perf_sched__replay(&sched);
+ } else {
+ usage_with_options(sched_usage, sched_options);
+ }
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff