v4.19.13 snapshot.
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
new file mode 100644
index 0000000..cbf39da
--- /dev/null
+++ b/tools/perf/builtin-sched.c
@@ -0,0 +1,3532 @@
+// SPDX-License-Identifier: GPL-2.0
+#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/thread_map.h"
+#include "util/color.h"
+#include "util/stat.h"
+#include "util/callchain.h"
+#include "util/time-utils.h"
+
+#include <subcmd/parse-options.h>
+#include "util/trace-event.h"
+
+#include "util/debug.h"
+
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <sys/prctl.h>
+#include <sys/resource.h>
+#include <inttypes.h>
+
+#include <errno.h>
+#include <semaphore.h>
+#include <pthread.h>
+#include <math.h>
+#include <api/fs/fs.h>
+#include <linux/time64.h>
+
+#include "sane_ctype.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"
+
+/* task state bitmask, copied from include/linux/sched.h */
+#define TASK_RUNNING 0
+#define TASK_INTERRUPTIBLE 1
+#define TASK_UNINTERRUPTIBLE 2
+#define __TASK_STOPPED 4
+#define __TASK_TRACED 8
+/* in tsk->exit_state */
+#define EXIT_DEAD 16
+#define EXIT_ZOMBIE 32
+#define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
+/* in tsk->state again */
+#define TASK_DEAD 64
+#define TASK_WAKEKILL 128
+#define TASK_WAKING 256
+#define TASK_PARKED 512
+
+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;
+ int num_merged;
+};
+
+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);
+};
+
+#define COLOR_PIDS PERF_COLOR_BLUE
+#define COLOR_CPUS PERF_COLOR_BG_RED
+
+struct perf_sched_map {
+ DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS);
+ int *comp_cpus;
+ bool comp;
+ struct thread_map *color_pids;
+ const char *color_pids_str;
+ struct cpu_map *color_cpus;
+ const char *color_cpus_str;
+ struct cpu_map *cpus;
+ const char *cpus_str;
+};
+
+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, merged_atom_root;
+ struct list_head sort_list, cmp_pid;
+ bool force;
+ bool skip_merge;
+ struct perf_sched_map map;
+
+ /* options for timehist command */
+ bool summary;
+ bool summary_only;
+ bool idle_hist;
+ bool show_callchain;
+ unsigned int max_stack;
+ bool show_cpu_visual;
+ bool show_wakeups;
+ bool show_next;
+ bool show_migrations;
+ bool show_state;
+ u64 skipped_samples;
+ const char *time_str;
+ struct perf_time_interval ptime;
+ struct perf_time_interval hist_time;
+};
+
+/* per thread run time data */
+struct thread_runtime {
+ u64 last_time; /* time of previous sched in/out event */
+ u64 dt_run; /* run time */
+ u64 dt_sleep; /* time between CPU access by sleep (off cpu) */
+ u64 dt_iowait; /* time between CPU access by iowait (off cpu) */
+ u64 dt_preempt; /* time between CPU access by preempt (off cpu) */
+ u64 dt_delay; /* time between wakeup and sched-in */
+ u64 ready_to_run; /* time of wakeup */
+
+ struct stats run_stats;
+ u64 total_run_time;
+ u64 total_sleep_time;
+ u64 total_iowait_time;
+ u64 total_preempt_time;
+ u64 total_delay_time;
+
+ int last_state;
+
+ char shortname[3];
+ bool comm_changed;
+
+ u64 migrations;
+};
+
+/* per event run time data */
+struct evsel_runtime {
+ u64 *last_time; /* time this event was last seen per cpu */
+ u32 ncpu; /* highest cpu slot allocated */
+};
+
+/* per cpu idle time data */
+struct idle_thread_runtime {
+ struct thread_runtime tr;
+ struct thread *last_thread;
+ struct rb_root sorted_root;
+ struct callchain_root callchain;
+ struct callchain_cursor cursor;
+};
+
+/* track idle times per cpu */
+static struct thread **idle_threads;
+static int idle_max_cpu;
+static char idle_comm[] = "<idle>";
+
+static u64 get_nsecs(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+
+ return ts.tv_sec * NSEC_PER_SEC + 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 = NSEC_PER_SEC;
+ 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 = NSEC_PER_SEC;
+ 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 > 0)
+ 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 * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC;
+ sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC;
+
+ 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,
+ str_error_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 / NSEC_PER_MSEC);
+
+ printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC);
+
+ printf("cpu: %0.2f / %0.2f",
+ (double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC);
+
+#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 / NSEC_PER_MSEC,
+ (double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC);
+#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, NSEC_PER_MSEC);
+ T1 = get_nsecs();
+
+ printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
+
+ T0 = get_nsecs();
+ sleep_nsecs(NSEC_PER_MSEC);
+ 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 > 0) {
+ 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 > 0)
+ 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);
+ goto out_put;
+ }
+
+ if (verbose > 0) {
+ 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));
+out_put:
+ thread__put(child);
+ thread__put(parent);
+ return 0;
+}
+
+struct sort_dimension {
+ const char *name;
+ sort_fn_t cmp;
+ struct list_head list;
+};
+
+/*
+ * handle runtime stats saved per thread
+ */
+static struct thread_runtime *thread__init_runtime(struct thread *thread)
+{
+ struct thread_runtime *r;
+
+ r = zalloc(sizeof(struct thread_runtime));
+ if (!r)
+ return NULL;
+
+ init_stats(&r->run_stats);
+ thread__set_priv(thread, r);
+
+ return r;
+}
+
+static struct thread_runtime *thread__get_runtime(struct thread *thread)
+{
+ struct thread_runtime *tr;
+
+ tr = thread__priv(thread);
+ if (tr == NULL) {
+ tr = thread__init_runtime(thread);
+ if (tr == NULL)
+ pr_debug("Failed to malloc memory for runtime data.\n");
+ }
+
+ return tr;
+}
+
+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, err = -1;
+ 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);
+ if (sched_out == NULL || sched_in == NULL)
+ goto out_put;
+
+ out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
+ if (!out_events) {
+ if (thread_atoms_insert(sched, sched_out))
+ goto out_put;
+ out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
+ if (!out_events) {
+ pr_err("out-event: Internal tree error");
+ goto out_put;
+ }
+ }
+ 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))
+ goto out_put;
+ in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
+ if (!in_events) {
+ pr_err("in-event: Internal tree error");
+ goto out_put;
+ }
+ /*
+ * 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))
+ goto out_put;
+ }
+ add_sched_in_event(in_events, timestamp);
+ err = 0;
+out_put:
+ thread__put(sched_out);
+ thread__put(sched_in);
+ return err;
+}
+
+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, err = -1;
+
+ if (thread == NULL)
+ return -1;
+
+ BUG_ON(cpu >= MAX_CPUS || cpu < 0);
+ if (!atoms) {
+ if (thread_atoms_insert(sched, thread))
+ goto out_put;
+ atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
+ if (!atoms) {
+ pr_err("in-event: Internal tree error");
+ goto out_put;
+ }
+ if (add_sched_out_event(atoms, 'R', timestamp))
+ goto out_put;
+ }
+
+ add_runtime_event(atoms, runtime, timestamp);
+ err = 0;
+out_put:
+ thread__put(thread);
+ return err;
+}
+
+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;
+ int err = -1;
+
+ wakee = machine__findnew_thread(machine, -1, pid);
+ if (wakee == NULL)
+ return -1;
+ atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
+ if (!atoms) {
+ if (thread_atoms_insert(sched, wakee))
+ goto out_put;
+ atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
+ if (!atoms) {
+ pr_err("wakeup-event: Internal tree error");
+ goto out_put;
+ }
+ if (add_sched_out_event(atoms, 'S', timestamp))
+ goto out_put;
+ }
+
+ 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)
+ goto out_ok;
+
+ sched->nr_timestamps++;
+ if (atom->sched_out_time > timestamp) {
+ sched->nr_unordered_timestamps++;
+ goto out_ok;
+ }
+
+ atom->state = THREAD_WAIT_CPU;
+ atom->wake_up_time = timestamp;
+out_ok:
+ err = 0;
+out_put:
+ thread__put(wakee);
+ return err;
+}
+
+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;
+ int err = -1;
+
+ /*
+ * Only need to worry about migration when profiling one CPU.
+ */
+ if (sched->profile_cpu == -1)
+ return 0;
+
+ migrant = machine__findnew_thread(machine, -1, pid);
+ if (migrant == NULL)
+ return -1;
+ atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
+ if (!atoms) {
+ if (thread_atoms_insert(sched, migrant))
+ goto out_put;
+ 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");
+ goto out_put;
+ }
+ if (add_sched_out_event(atoms, 'R', timestamp))
+ goto out_put;
+ }
+
+ 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++;
+ err = 0;
+out_put:
+ thread__put(migrant);
+ return err;
+}
+
+static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
+{
+ int i;
+ int ret;
+ u64 avg;
+ char max_lat_at[32];
+
+ 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;
+
+ if (work_list->num_merged > 1)
+ ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
+ else
+ 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;
+ timestamp__scnprintf_usec(work_list->max_lat_at, max_lat_at, sizeof(max_lat_at));
+
+ printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13s s\n",
+ (double)work_list->total_runtime / NSEC_PER_MSEC,
+ work_list->nb_atoms, (double)avg / NSEC_PER_MSEC,
+ (double)work_list->max_lat / NSEC_PER_MSEC,
+ max_lat_at);
+}
+
+static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
+{
+ if (l->thread == r->thread)
+ return 0;
+ if (l->thread->tid < r->thread->tid)
+ return -1;
+ if (l->thread->tid > r->thread->tid)
+ return 1;
+ return (int)(l->thread - r->thread);
+}
+
+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;
+ struct rb_root *root = &sched->atom_root;
+again:
+ for (;;) {
+ struct work_atoms *data;
+ node = rb_first(root);
+ if (!node)
+ break;
+
+ rb_erase(node, root);
+ data = rb_entry(node, struct work_atoms, node);
+ __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
+ }
+ if (root == &sched->atom_root) {
+ root = &sched->merged_atom_root;
+ goto again;
+ }
+}
+
+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;
+}
+
+union map_priv {
+ void *ptr;
+ bool color;
+};
+
+static bool thread__has_color(struct thread *thread)
+{
+ union map_priv priv = {
+ .ptr = thread__priv(thread),
+ };
+
+ return priv.color;
+}
+
+static struct thread*
+map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid)
+{
+ struct thread *thread = machine__findnew_thread(machine, pid, tid);
+ union map_priv priv = {
+ .color = false,
+ };
+
+ if (!sched->map.color_pids || !thread || thread__priv(thread))
+ return thread;
+
+ if (thread_map__has(sched->map.color_pids, tid))
+ priv.color = true;
+
+ thread__set_priv(thread, priv.ptr);
+ return thread;
+}
+
+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;
+ struct thread_runtime *tr;
+ int new_shortname;
+ u64 timestamp0, timestamp = sample->time;
+ s64 delta;
+ int i, this_cpu = sample->cpu;
+ int cpus_nr;
+ bool new_cpu = false;
+ const char *color = PERF_COLOR_NORMAL;
+ char stimestamp[32];
+
+ BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
+
+ if (this_cpu > sched->max_cpu)
+ sched->max_cpu = this_cpu;
+
+ if (sched->map.comp) {
+ cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS);
+ if (!test_and_set_bit(this_cpu, sched->map.comp_cpus_mask)) {
+ sched->map.comp_cpus[cpus_nr++] = this_cpu;
+ new_cpu = true;
+ }
+ } else
+ cpus_nr = sched->max_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 = map__findnew_thread(sched, machine, -1, next_pid);
+ if (sched_in == NULL)
+ return -1;
+
+ tr = thread__get_runtime(sched_in);
+ if (tr == NULL) {
+ thread__put(sched_in);
+ return -1;
+ }
+
+ sched->curr_thread[this_cpu] = thread__get(sched_in);
+
+ printf(" ");
+
+ new_shortname = 0;
+ if (!tr->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.
+ */
+ tr->shortname[0] = '.';
+ tr->shortname[1] = ' ';
+ } else {
+ tr->shortname[0] = sched->next_shortname1;
+ tr->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 (i = 0; i < cpus_nr; i++) {
+ int cpu = sched->map.comp ? sched->map.comp_cpus[i] : i;
+ struct thread *curr_thread = sched->curr_thread[cpu];
+ struct thread_runtime *curr_tr;
+ const char *pid_color = color;
+ const char *cpu_color = color;
+
+ if (curr_thread && thread__has_color(curr_thread))
+ pid_color = COLOR_PIDS;
+
+ if (sched->map.cpus && !cpu_map__has(sched->map.cpus, cpu))
+ continue;
+
+ if (sched->map.color_cpus && cpu_map__has(sched->map.color_cpus, cpu))
+ cpu_color = COLOR_CPUS;
+
+ if (cpu != this_cpu)
+ color_fprintf(stdout, color, " ");
+ else
+ color_fprintf(stdout, cpu_color, "*");
+
+ if (sched->curr_thread[cpu]) {
+ curr_tr = thread__get_runtime(sched->curr_thread[cpu]);
+ if (curr_tr == NULL) {
+ thread__put(sched_in);
+ return -1;
+ }
+ color_fprintf(stdout, pid_color, "%2s ", curr_tr->shortname);
+ } else
+ color_fprintf(stdout, color, " ");
+ }
+
+ if (sched->map.cpus && !cpu_map__has(sched->map.cpus, this_cpu))
+ goto out;
+
+ timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
+ color_fprintf(stdout, color, " %12s secs ", stimestamp);
+ if (new_shortname || tr->comm_changed || (verbose > 0 && sched_in->tid)) {
+ const char *pid_color = color;
+
+ if (thread__has_color(sched_in))
+ pid_color = COLOR_PIDS;
+
+ color_fprintf(stdout, pid_color, "%s => %s:%d",
+ tr->shortname, thread__comm_str(sched_in), sched_in->tid);
+ tr->comm_changed = false;
+ }
+
+ if (sched->map.comp && new_cpu)
+ color_fprintf(stdout, color, " (CPU %d)", this_cpu);
+
+out:
+ color_fprintf(stdout, color, "\n");
+
+ thread__put(sched_in);
+
+ 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__process_comm(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct thread *thread;
+ struct thread_runtime *tr;
+ int err;
+
+ err = perf_event__process_comm(tool, event, sample, machine);
+ if (err)
+ return err;
+
+ thread = machine__find_thread(machine, sample->pid, sample->tid);
+ if (!thread) {
+ pr_err("Internal error: can't find thread\n");
+ return -1;
+ }
+
+ tr = thread__get_runtime(thread);
+ if (tr == NULL) {
+ thread__put(thread);
+ return -1;
+ }
+
+ tr->comm_changed = true;
+ thread__put(thread);
+
+ return 0;
+}
+
+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 data = {
+ .file = {
+ .path = input_name,
+ },
+ .mode = PERF_DATA_MODE_READ,
+ .force = sched->force,
+ };
+ int rc = -1;
+
+ session = perf_session__new(&data, 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;
+}
+
+/*
+ * scheduling times are printed as msec.usec
+ */
+static inline void print_sched_time(unsigned long long nsecs, int width)
+{
+ unsigned long msecs;
+ unsigned long usecs;
+
+ msecs = nsecs / NSEC_PER_MSEC;
+ nsecs -= msecs * NSEC_PER_MSEC;
+ usecs = nsecs / NSEC_PER_USEC;
+ printf("%*lu.%03lu ", width, msecs, usecs);
+}
+
+/*
+ * returns runtime data for event, allocating memory for it the
+ * first time it is used.
+ */
+static struct evsel_runtime *perf_evsel__get_runtime(struct perf_evsel *evsel)
+{
+ struct evsel_runtime *r = evsel->priv;
+
+ if (r == NULL) {
+ r = zalloc(sizeof(struct evsel_runtime));
+ evsel->priv = r;
+ }
+
+ return r;
+}
+
+/*
+ * save last time event was seen per cpu
+ */
+static void perf_evsel__save_time(struct perf_evsel *evsel,
+ u64 timestamp, u32 cpu)
+{
+ struct evsel_runtime *r = perf_evsel__get_runtime(evsel);
+
+ if (r == NULL)
+ return;
+
+ if ((cpu >= r->ncpu) || (r->last_time == NULL)) {
+ int i, n = __roundup_pow_of_two(cpu+1);
+ void *p = r->last_time;
+
+ p = realloc(r->last_time, n * sizeof(u64));
+ if (!p)
+ return;
+
+ r->last_time = p;
+ for (i = r->ncpu; i < n; ++i)
+ r->last_time[i] = (u64) 0;
+
+ r->ncpu = n;
+ }
+
+ r->last_time[cpu] = timestamp;
+}
+
+/* returns last time this event was seen on the given cpu */
+static u64 perf_evsel__get_time(struct perf_evsel *evsel, u32 cpu)
+{
+ struct evsel_runtime *r = perf_evsel__get_runtime(evsel);
+
+ if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu))
+ return 0;
+
+ return r->last_time[cpu];
+}
+
+static int comm_width = 30;
+
+static char *timehist_get_commstr(struct thread *thread)
+{
+ static char str[32];
+ const char *comm = thread__comm_str(thread);
+ pid_t tid = thread->tid;
+ pid_t pid = thread->pid_;
+ int n;
+
+ if (pid == 0)
+ n = scnprintf(str, sizeof(str), "%s", comm);
+
+ else if (tid != pid)
+ n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid);
+
+ else
+ n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid);
+
+ if (n > comm_width)
+ comm_width = n;
+
+ return str;
+}
+
+static void timehist_header(struct perf_sched *sched)
+{
+ u32 ncpus = sched->max_cpu + 1;
+ u32 i, j;
+
+ printf("%15s %6s ", "time", "cpu");
+
+ if (sched->show_cpu_visual) {
+ printf(" ");
+ for (i = 0, j = 0; i < ncpus; ++i) {
+ printf("%x", j++);
+ if (j > 15)
+ j = 0;
+ }
+ printf(" ");
+ }
+
+ printf(" %-*s %9s %9s %9s", comm_width,
+ "task name", "wait time", "sch delay", "run time");
+
+ if (sched->show_state)
+ printf(" %s", "state");
+
+ printf("\n");
+
+ /*
+ * units row
+ */
+ printf("%15s %-6s ", "", "");
+
+ if (sched->show_cpu_visual)
+ printf(" %*s ", ncpus, "");
+
+ printf(" %-*s %9s %9s %9s", comm_width,
+ "[tid/pid]", "(msec)", "(msec)", "(msec)");
+
+ if (sched->show_state)
+ printf(" %5s", "");
+
+ printf("\n");
+
+ /*
+ * separator
+ */
+ printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line);
+
+ if (sched->show_cpu_visual)
+ printf(" %.*s ", ncpus, graph_dotted_line);
+
+ printf(" %.*s %.9s %.9s %.9s", comm_width,
+ graph_dotted_line, graph_dotted_line, graph_dotted_line,
+ graph_dotted_line);
+
+ if (sched->show_state)
+ printf(" %.5s", graph_dotted_line);
+
+ printf("\n");
+}
+
+static char task_state_char(struct thread *thread, int state)
+{
+ static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
+ unsigned bit = state ? ffs(state) : 0;
+
+ /* 'I' for idle */
+ if (thread->tid == 0)
+ return 'I';
+
+ return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
+static void timehist_print_sample(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct addr_location *al,
+ struct thread *thread,
+ u64 t, int state)
+{
+ struct thread_runtime *tr = thread__priv(thread);
+ const char *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
+ const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
+ u32 max_cpus = sched->max_cpu + 1;
+ char tstr[64];
+ char nstr[30];
+ u64 wait_time;
+
+ timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
+ printf("%15s [%04d] ", tstr, sample->cpu);
+
+ if (sched->show_cpu_visual) {
+ u32 i;
+ char c;
+
+ printf(" ");
+ for (i = 0; i < max_cpus; ++i) {
+ /* flag idle times with 'i'; others are sched events */
+ if (i == sample->cpu)
+ c = (thread->tid == 0) ? 'i' : 's';
+ else
+ c = ' ';
+ printf("%c", c);
+ }
+ printf(" ");
+ }
+
+ printf(" %-*s ", comm_width, timehist_get_commstr(thread));
+
+ wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt;
+ print_sched_time(wait_time, 6);
+
+ print_sched_time(tr->dt_delay, 6);
+ print_sched_time(tr->dt_run, 6);
+
+ if (sched->show_state)
+ printf(" %5c ", task_state_char(thread, state));
+
+ if (sched->show_next) {
+ snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
+ printf(" %-*s", comm_width, nstr);
+ }
+
+ if (sched->show_wakeups && !sched->show_next)
+ printf(" %-*s", comm_width, "");
+
+ if (thread->tid == 0)
+ goto out;
+
+ if (sched->show_callchain)
+ printf(" ");
+
+ sample__fprintf_sym(sample, al, 0,
+ EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE |
+ EVSEL__PRINT_CALLCHAIN_ARROW |
+ EVSEL__PRINT_SKIP_IGNORED,
+ &callchain_cursor, stdout);
+
+out:
+ printf("\n");
+}
+
+/*
+ * Explanation of delta-time stats:
+ *
+ * t = time of current schedule out event
+ * tprev = time of previous sched out event
+ * also time of schedule-in event for current task
+ * last_time = time of last sched change event for current task
+ * (i.e, time process was last scheduled out)
+ * ready_to_run = time of wakeup for current task
+ *
+ * -----|------------|------------|------------|------
+ * last ready tprev t
+ * time to run
+ *
+ * |-------- dt_wait --------|
+ * |- dt_delay -|-- dt_run --|
+ *
+ * dt_run = run time of current task
+ * dt_wait = time between last schedule out event for task and tprev
+ * represents time spent off the cpu
+ * dt_delay = time between wakeup and schedule-in of task
+ */
+
+static void timehist_update_runtime_stats(struct thread_runtime *r,
+ u64 t, u64 tprev)
+{
+ r->dt_delay = 0;
+ r->dt_sleep = 0;
+ r->dt_iowait = 0;
+ r->dt_preempt = 0;
+ r->dt_run = 0;
+
+ if (tprev) {
+ r->dt_run = t - tprev;
+ if (r->ready_to_run) {
+ if (r->ready_to_run > tprev)
+ pr_debug("time travel: wakeup time for task > previous sched_switch event\n");
+ else
+ r->dt_delay = tprev - r->ready_to_run;
+ }
+
+ if (r->last_time > tprev)
+ pr_debug("time travel: last sched out time for task > previous sched_switch event\n");
+ else if (r->last_time) {
+ u64 dt_wait = tprev - r->last_time;
+
+ if (r->last_state == TASK_RUNNING)
+ r->dt_preempt = dt_wait;
+ else if (r->last_state == TASK_UNINTERRUPTIBLE)
+ r->dt_iowait = dt_wait;
+ else
+ r->dt_sleep = dt_wait;
+ }
+ }
+
+ update_stats(&r->run_stats, r->dt_run);
+
+ r->total_run_time += r->dt_run;
+ r->total_delay_time += r->dt_delay;
+ r->total_sleep_time += r->dt_sleep;
+ r->total_iowait_time += r->dt_iowait;
+ r->total_preempt_time += r->dt_preempt;
+}
+
+static bool is_idle_sample(struct perf_sample *sample,
+ struct perf_evsel *evsel)
+{
+ /* pid 0 == swapper == idle task */
+ if (strcmp(perf_evsel__name(evsel), "sched:sched_switch") == 0)
+ return perf_evsel__intval(evsel, sample, "prev_pid") == 0;
+
+ return sample->pid == 0;
+}
+
+static void save_task_callchain(struct perf_sched *sched,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel,
+ struct machine *machine)
+{
+ struct callchain_cursor *cursor = &callchain_cursor;
+ struct thread *thread;
+
+ /* want main thread for process - has maps */
+ thread = machine__findnew_thread(machine, sample->pid, sample->pid);
+ if (thread == NULL) {
+ pr_debug("Failed to get thread for pid %d.\n", sample->pid);
+ return;
+ }
+
+ if (!sched->show_callchain || sample->callchain == NULL)
+ return;
+
+ if (thread__resolve_callchain(thread, cursor, evsel, sample,
+ NULL, NULL, sched->max_stack + 2) != 0) {
+ if (verbose > 0)
+ pr_err("Failed to resolve callchain. Skipping\n");
+
+ return;
+ }
+
+ callchain_cursor_commit(cursor);
+
+ while (true) {
+ struct callchain_cursor_node *node;
+ struct symbol *sym;
+
+ node = callchain_cursor_current(cursor);
+ if (node == NULL)
+ break;
+
+ sym = node->sym;
+ if (sym) {
+ if (!strcmp(sym->name, "schedule") ||
+ !strcmp(sym->name, "__schedule") ||
+ !strcmp(sym->name, "preempt_schedule"))
+ sym->ignore = 1;
+ }
+
+ callchain_cursor_advance(cursor);
+ }
+}
+
+static int init_idle_thread(struct thread *thread)
+{
+ struct idle_thread_runtime *itr;
+
+ thread__set_comm(thread, idle_comm, 0);
+
+ itr = zalloc(sizeof(*itr));
+ if (itr == NULL)
+ return -ENOMEM;
+
+ init_stats(&itr->tr.run_stats);
+ callchain_init(&itr->callchain);
+ callchain_cursor_reset(&itr->cursor);
+ thread__set_priv(thread, itr);
+
+ return 0;
+}
+
+/*
+ * Track idle stats per cpu by maintaining a local thread
+ * struct for the idle task on each cpu.
+ */
+static int init_idle_threads(int ncpu)
+{
+ int i, ret;
+
+ idle_threads = zalloc(ncpu * sizeof(struct thread *));
+ if (!idle_threads)
+ return -ENOMEM;
+
+ idle_max_cpu = ncpu;
+
+ /* allocate the actual thread struct if needed */
+ for (i = 0; i < ncpu; ++i) {
+ idle_threads[i] = thread__new(0, 0);
+ if (idle_threads[i] == NULL)
+ return -ENOMEM;
+
+ ret = init_idle_thread(idle_threads[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void free_idle_threads(void)
+{
+ int i;
+
+ if (idle_threads == NULL)
+ return;
+
+ for (i = 0; i < idle_max_cpu; ++i) {
+ if ((idle_threads[i]))
+ thread__delete(idle_threads[i]);
+ }
+
+ free(idle_threads);
+}
+
+static struct thread *get_idle_thread(int cpu)
+{
+ /*
+ * expand/allocate array of pointers to local thread
+ * structs if needed
+ */
+ if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) {
+ int i, j = __roundup_pow_of_two(cpu+1);
+ void *p;
+
+ p = realloc(idle_threads, j * sizeof(struct thread *));
+ if (!p)
+ return NULL;
+
+ idle_threads = (struct thread **) p;
+ for (i = idle_max_cpu; i < j; ++i)
+ idle_threads[i] = NULL;
+
+ idle_max_cpu = j;
+ }
+
+ /* allocate a new thread struct if needed */
+ if (idle_threads[cpu] == NULL) {
+ idle_threads[cpu] = thread__new(0, 0);
+
+ if (idle_threads[cpu]) {
+ if (init_idle_thread(idle_threads[cpu]) < 0)
+ return NULL;
+ }
+ }
+
+ return idle_threads[cpu];
+}
+
+static void save_idle_callchain(struct perf_sched *sched,
+ struct idle_thread_runtime *itr,
+ struct perf_sample *sample)
+{
+ if (!sched->show_callchain || sample->callchain == NULL)
+ return;
+
+ callchain_cursor__copy(&itr->cursor, &callchain_cursor);
+}
+
+static struct thread *timehist_get_thread(struct perf_sched *sched,
+ struct perf_sample *sample,
+ struct machine *machine,
+ struct perf_evsel *evsel)
+{
+ struct thread *thread;
+
+ if (is_idle_sample(sample, evsel)) {
+ thread = get_idle_thread(sample->cpu);
+ if (thread == NULL)
+ pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
+
+ } else {
+ /* there were samples with tid 0 but non-zero pid */
+ thread = machine__findnew_thread(machine, sample->pid,
+ sample->tid ?: sample->pid);
+ if (thread == NULL) {
+ pr_debug("Failed to get thread for tid %d. skipping sample.\n",
+ sample->tid);
+ }
+
+ save_task_callchain(sched, sample, evsel, machine);
+ if (sched->idle_hist) {
+ struct thread *idle;
+ struct idle_thread_runtime *itr;
+
+ idle = get_idle_thread(sample->cpu);
+ if (idle == NULL) {
+ pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
+ return NULL;
+ }
+
+ itr = thread__priv(idle);
+ if (itr == NULL)
+ return NULL;
+
+ itr->last_thread = thread;
+
+ /* copy task callchain when entering to idle */
+ if (perf_evsel__intval(evsel, sample, "next_pid") == 0)
+ save_idle_callchain(sched, itr, sample);
+ }
+ }
+
+ return thread;
+}
+
+static bool timehist_skip_sample(struct perf_sched *sched,
+ struct thread *thread,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample)
+{
+ bool rc = false;
+
+ if (thread__is_filtered(thread)) {
+ rc = true;
+ sched->skipped_samples++;
+ }
+
+ if (sched->idle_hist) {
+ if (strcmp(perf_evsel__name(evsel), "sched:sched_switch"))
+ rc = true;
+ else if (perf_evsel__intval(evsel, sample, "prev_pid") != 0 &&
+ perf_evsel__intval(evsel, sample, "next_pid") != 0)
+ rc = true;
+ }
+
+ return rc;
+}
+
+static void timehist_print_wakeup_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine,
+ struct thread *awakened)
+{
+ struct thread *thread;
+ char tstr[64];
+
+ thread = machine__findnew_thread(machine, sample->pid, sample->tid);
+ if (thread == NULL)
+ return;
+
+ /* show wakeup unless both awakee and awaker are filtered */
+ if (timehist_skip_sample(sched, thread, evsel, sample) &&
+ timehist_skip_sample(sched, awakened, evsel, sample)) {
+ return;
+ }
+
+ timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
+ printf("%15s [%04d] ", tstr, sample->cpu);
+ if (sched->show_cpu_visual)
+ printf(" %*s ", sched->max_cpu + 1, "");
+
+ printf(" %-*s ", comm_width, timehist_get_commstr(thread));
+
+ /* dt spacer */
+ printf(" %9s %9s %9s ", "", "", "");
+
+ printf("awakened: %s", timehist_get_commstr(awakened));
+
+ printf("\n");
+}
+
+static int timehist_sched_wakeup_event(struct perf_tool *tool,
+ union perf_event *event __maybe_unused,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+ struct thread *thread;
+ struct thread_runtime *tr = NULL;
+ /* want pid of awakened task not pid in sample */
+ const u32 pid = perf_evsel__intval(evsel, sample, "pid");
+
+ thread = machine__findnew_thread(machine, 0, pid);
+ if (thread == NULL)
+ return -1;
+
+ tr = thread__get_runtime(thread);
+ if (tr == NULL)
+ return -1;
+
+ if (tr->ready_to_run == 0)
+ tr->ready_to_run = sample->time;
+
+ /* show wakeups if requested */
+ if (sched->show_wakeups &&
+ !perf_time__skip_sample(&sched->ptime, sample->time))
+ timehist_print_wakeup_event(sched, evsel, sample, machine, thread);
+
+ return 0;
+}
+
+static void timehist_print_migration_event(struct perf_sched *sched,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine,
+ struct thread *migrated)
+{
+ struct thread *thread;
+ char tstr[64];
+ u32 max_cpus = sched->max_cpu + 1;
+ u32 ocpu, dcpu;
+
+ if (sched->summary_only)
+ return;
+
+ max_cpus = sched->max_cpu + 1;
+ ocpu = perf_evsel__intval(evsel, sample, "orig_cpu");
+ dcpu = perf_evsel__intval(evsel, sample, "dest_cpu");
+
+ thread = machine__findnew_thread(machine, sample->pid, sample->tid);
+ if (thread == NULL)
+ return;
+
+ if (timehist_skip_sample(sched, thread, evsel, sample) &&
+ timehist_skip_sample(sched, migrated, evsel, sample)) {
+ return;
+ }
+
+ timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
+ printf("%15s [%04d] ", tstr, sample->cpu);
+
+ if (sched->show_cpu_visual) {
+ u32 i;
+ char c;
+
+ printf(" ");
+ for (i = 0; i < max_cpus; ++i) {
+ c = (i == sample->cpu) ? 'm' : ' ';
+ printf("%c", c);
+ }
+ printf(" ");
+ }
+
+ printf(" %-*s ", comm_width, timehist_get_commstr(thread));
+
+ /* dt spacer */
+ printf(" %9s %9s %9s ", "", "", "");
+
+ printf("migrated: %s", timehist_get_commstr(migrated));
+ printf(" cpu %d => %d", ocpu, dcpu);
+
+ printf("\n");
+}
+
+static int timehist_migrate_task_event(struct perf_tool *tool,
+ union perf_event *event __maybe_unused,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+ struct thread *thread;
+ struct thread_runtime *tr = NULL;
+ /* want pid of migrated task not pid in sample */
+ const u32 pid = perf_evsel__intval(evsel, sample, "pid");
+
+ thread = machine__findnew_thread(machine, 0, pid);
+ if (thread == NULL)
+ return -1;
+
+ tr = thread__get_runtime(thread);
+ if (tr == NULL)
+ return -1;
+
+ tr->migrations++;
+
+ /* show migrations if requested */
+ timehist_print_migration_event(sched, evsel, sample, machine, thread);
+
+ return 0;
+}
+
+static int timehist_sched_change_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+ struct perf_time_interval *ptime = &sched->ptime;
+ struct addr_location al;
+ struct thread *thread;
+ struct thread_runtime *tr = NULL;
+ u64 tprev, t = sample->time;
+ int rc = 0;
+ int state = perf_evsel__intval(evsel, sample, "prev_state");
+
+
+ if (machine__resolve(machine, &al, sample) < 0) {
+ pr_err("problem processing %d event. skipping it\n",
+ event->header.type);
+ rc = -1;
+ goto out;
+ }
+
+ thread = timehist_get_thread(sched, sample, machine, evsel);
+ if (thread == NULL) {
+ rc = -1;
+ goto out;
+ }
+
+ if (timehist_skip_sample(sched, thread, evsel, sample))
+ goto out;
+
+ tr = thread__get_runtime(thread);
+ if (tr == NULL) {
+ rc = -1;
+ goto out;
+ }
+
+ tprev = perf_evsel__get_time(evsel, sample->cpu);
+
+ /*
+ * If start time given:
+ * - sample time is under window user cares about - skip sample
+ * - tprev is under window user cares about - reset to start of window
+ */
+ if (ptime->start && ptime->start > t)
+ goto out;
+
+ if (tprev && ptime->start > tprev)
+ tprev = ptime->start;
+
+ /*
+ * If end time given:
+ * - previous sched event is out of window - we are done
+ * - sample time is beyond window user cares about - reset it
+ * to close out stats for time window interest
+ */
+ if (ptime->end) {
+ if (tprev > ptime->end)
+ goto out;
+
+ if (t > ptime->end)
+ t = ptime->end;
+ }
+
+ if (!sched->idle_hist || thread->tid == 0) {
+ timehist_update_runtime_stats(tr, t, tprev);
+
+ if (sched->idle_hist) {
+ struct idle_thread_runtime *itr = (void *)tr;
+ struct thread_runtime *last_tr;
+
+ BUG_ON(thread->tid != 0);
+
+ if (itr->last_thread == NULL)
+ goto out;
+
+ /* add current idle time as last thread's runtime */
+ last_tr = thread__get_runtime(itr->last_thread);
+ if (last_tr == NULL)
+ goto out;
+
+ timehist_update_runtime_stats(last_tr, t, tprev);
+ /*
+ * remove delta time of last thread as it's not updated
+ * and otherwise it will show an invalid value next
+ * time. we only care total run time and run stat.
+ */
+ last_tr->dt_run = 0;
+ last_tr->dt_delay = 0;
+ last_tr->dt_sleep = 0;
+ last_tr->dt_iowait = 0;
+ last_tr->dt_preempt = 0;
+
+ if (itr->cursor.nr)
+ callchain_append(&itr->callchain, &itr->cursor, t - tprev);
+
+ itr->last_thread = NULL;
+ }
+ }
+
+ if (!sched->summary_only)
+ timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
+
+out:
+ if (sched->hist_time.start == 0 && t >= ptime->start)
+ sched->hist_time.start = t;
+ if (ptime->end == 0 || t <= ptime->end)
+ sched->hist_time.end = t;
+
+ if (tr) {
+ /* time of this sched_switch event becomes last time task seen */
+ tr->last_time = sample->time;
+
+ /* last state is used to determine where to account wait time */
+ tr->last_state = state;
+
+ /* sched out event for task so reset ready to run time */
+ tr->ready_to_run = 0;
+ }
+
+ perf_evsel__save_time(evsel, sample->time, sample->cpu);
+
+ return rc;
+}
+
+static int timehist_sched_switch_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine __maybe_unused)
+{
+ return timehist_sched_change_event(tool, event, evsel, sample, machine);
+}
+
+static int process_lost(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine __maybe_unused)
+{
+ char tstr[64];
+
+ timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
+ printf("%15s ", tstr);
+ printf("lost %" PRIu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
+
+ return 0;
+}
+
+
+static void print_thread_runtime(struct thread *t,
+ struct thread_runtime *r)
+{
+ double mean = avg_stats(&r->run_stats);
+ float stddev;
+
+ printf("%*s %5d %9" PRIu64 " ",
+ comm_width, timehist_get_commstr(t), t->ppid,
+ (u64) r->run_stats.n);
+
+ print_sched_time(r->total_run_time, 8);
+ stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean);
+ print_sched_time(r->run_stats.min, 6);
+ printf(" ");
+ print_sched_time((u64) mean, 6);
+ printf(" ");
+ print_sched_time(r->run_stats.max, 6);
+ printf(" ");
+ printf("%5.2f", stddev);
+ printf(" %5" PRIu64, r->migrations);
+ printf("\n");
+}
+
+static void print_thread_waittime(struct thread *t,
+ struct thread_runtime *r)
+{
+ printf("%*s %5d %9" PRIu64 " ",
+ comm_width, timehist_get_commstr(t), t->ppid,
+ (u64) r->run_stats.n);
+
+ print_sched_time(r->total_run_time, 8);
+ print_sched_time(r->total_sleep_time, 6);
+ printf(" ");
+ print_sched_time(r->total_iowait_time, 6);
+ printf(" ");
+ print_sched_time(r->total_preempt_time, 6);
+ printf(" ");
+ print_sched_time(r->total_delay_time, 6);
+ printf("\n");
+}
+
+struct total_run_stats {
+ struct perf_sched *sched;
+ u64 sched_count;
+ u64 task_count;
+ u64 total_run_time;
+};
+
+static int __show_thread_runtime(struct thread *t, void *priv)
+{
+ struct total_run_stats *stats = priv;
+ struct thread_runtime *r;
+
+ if (thread__is_filtered(t))
+ return 0;
+
+ r = thread__priv(t);
+ if (r && r->run_stats.n) {
+ stats->task_count++;
+ stats->sched_count += r->run_stats.n;
+ stats->total_run_time += r->total_run_time;
+
+ if (stats->sched->show_state)
+ print_thread_waittime(t, r);
+ else
+ print_thread_runtime(t, r);
+ }
+
+ return 0;
+}
+
+static int show_thread_runtime(struct thread *t, void *priv)
+{
+ if (t->dead)
+ return 0;
+
+ return __show_thread_runtime(t, priv);
+}
+
+static int show_deadthread_runtime(struct thread *t, void *priv)
+{
+ if (!t->dead)
+ return 0;
+
+ return __show_thread_runtime(t, priv);
+}
+
+static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
+{
+ const char *sep = " <- ";
+ struct callchain_list *chain;
+ size_t ret = 0;
+ char bf[1024];
+ bool first;
+
+ if (node == NULL)
+ return 0;
+
+ ret = callchain__fprintf_folded(fp, node->parent);
+ first = (ret == 0);
+
+ list_for_each_entry(chain, &node->val, list) {
+ if (chain->ip >= PERF_CONTEXT_MAX)
+ continue;
+ if (chain->ms.sym && chain->ms.sym->ignore)
+ continue;
+ ret += fprintf(fp, "%s%s", first ? "" : sep,
+ callchain_list__sym_name(chain, bf, sizeof(bf),
+ false));
+ first = false;
+ }
+
+ return ret;
+}
+
+static size_t timehist_print_idlehist_callchain(struct rb_root *root)
+{
+ size_t ret = 0;
+ FILE *fp = stdout;
+ struct callchain_node *chain;
+ struct rb_node *rb_node = rb_first(root);
+
+ printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains");
+ printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line,
+ graph_dotted_line);
+
+ while (rb_node) {
+ chain = rb_entry(rb_node, struct callchain_node, rb_node);
+ rb_node = rb_next(rb_node);
+
+ ret += fprintf(fp, " ");
+ print_sched_time(chain->hit, 12);
+ ret += 16; /* print_sched_time returns 2nd arg + 4 */
+ ret += fprintf(fp, " %8d ", chain->count);
+ ret += callchain__fprintf_folded(fp, chain);
+ ret += fprintf(fp, "\n");
+ }
+
+ return ret;
+}
+
+static void timehist_print_summary(struct perf_sched *sched,
+ struct perf_session *session)
+{
+ struct machine *m = &session->machines.host;
+ struct total_run_stats totals;
+ u64 task_count;
+ struct thread *t;
+ struct thread_runtime *r;
+ int i;
+ u64 hist_time = sched->hist_time.end - sched->hist_time.start;
+
+ memset(&totals, 0, sizeof(totals));
+ totals.sched = sched;
+
+ if (sched->idle_hist) {
+ printf("\nIdle-time summary\n");
+ printf("%*s parent sched-out ", comm_width, "comm");
+ printf(" idle-time min-idle avg-idle max-idle stddev migrations\n");
+ } else if (sched->show_state) {
+ printf("\nWait-time summary\n");
+ printf("%*s parent sched-in ", comm_width, "comm");
+ printf(" run-time sleep iowait preempt delay\n");
+ } else {
+ printf("\nRuntime summary\n");
+ printf("%*s parent sched-in ", comm_width, "comm");
+ printf(" run-time min-run avg-run max-run stddev migrations\n");
+ }
+ printf("%*s (count) ", comm_width, "");
+ printf(" (msec) (msec) (msec) (msec) %s\n",
+ sched->show_state ? "(msec)" : "%");
+ printf("%.117s\n", graph_dotted_line);
+
+ machine__for_each_thread(m, show_thread_runtime, &totals);
+ task_count = totals.task_count;
+ if (!task_count)
+ printf("<no still running tasks>\n");
+
+ printf("\nTerminated tasks:\n");
+ machine__for_each_thread(m, show_deadthread_runtime, &totals);
+ if (task_count == totals.task_count)
+ printf("<no terminated tasks>\n");
+
+ /* CPU idle stats not tracked when samples were skipped */
+ if (sched->skipped_samples && !sched->idle_hist)
+ return;
+
+ printf("\nIdle stats:\n");
+ for (i = 0; i < idle_max_cpu; ++i) {
+ t = idle_threads[i];
+ if (!t)
+ continue;
+
+ r = thread__priv(t);
+ if (r && r->run_stats.n) {
+ totals.sched_count += r->run_stats.n;
+ printf(" CPU %2d idle for ", i);
+ print_sched_time(r->total_run_time, 6);
+ printf(" msec (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time);
+ } else
+ printf(" CPU %2d idle entire time window\n", i);
+ }
+
+ if (sched->idle_hist && sched->show_callchain) {
+ callchain_param.mode = CHAIN_FOLDED;
+ callchain_param.value = CCVAL_PERIOD;
+
+ callchain_register_param(&callchain_param);
+
+ printf("\nIdle stats by callchain:\n");
+ for (i = 0; i < idle_max_cpu; ++i) {
+ struct idle_thread_runtime *itr;
+
+ t = idle_threads[i];
+ if (!t)
+ continue;
+
+ itr = thread__priv(t);
+ if (itr == NULL)
+ continue;
+
+ callchain_param.sort(&itr->sorted_root, &itr->callchain,
+ 0, &callchain_param);
+
+ printf(" CPU %2d:", i);
+ print_sched_time(itr->tr.total_run_time, 6);
+ printf(" msec\n");
+ timehist_print_idlehist_callchain(&itr->sorted_root);
+ printf("\n");
+ }
+ }
+
+ printf("\n"
+ " Total number of unique tasks: %" PRIu64 "\n"
+ "Total number of context switches: %" PRIu64 "\n",
+ totals.task_count, totals.sched_count);
+
+ printf(" Total run time (msec): ");
+ print_sched_time(totals.total_run_time, 2);
+ printf("\n");
+
+ printf(" Total scheduling time (msec): ");
+ print_sched_time(hist_time, 2);
+ printf(" (x %d)\n", sched->max_cpu);
+}
+
+typedef int (*sched_handler)(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine);
+
+static int perf_timehist__process_sample(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel,
+ struct machine *machine)
+{
+ struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
+ int err = 0;
+ int this_cpu = sample->cpu;
+
+ if (this_cpu > sched->max_cpu)
+ sched->max_cpu = this_cpu;
+
+ if (evsel->handler != NULL) {
+ sched_handler f = evsel->handler;
+
+ err = f(tool, event, evsel, sample, machine);
+ }
+
+ return err;
+}
+
+static int timehist_check_attr(struct perf_sched *sched,
+ struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel;
+ struct evsel_runtime *er;
+
+ list_for_each_entry(evsel, &evlist->entries, node) {
+ er = perf_evsel__get_runtime(evsel);
+ if (er == NULL) {
+ pr_err("Failed to allocate memory for evsel runtime data\n");
+ return -1;
+ }
+
+ if (sched->show_callchain && !evsel__has_callchain(evsel)) {
+ pr_info("Samples do not have callchains.\n");
+ sched->show_callchain = 0;
+ symbol_conf.use_callchain = 0;
+ }
+ }
+
+ return 0;
+}
+
+static int perf_sched__timehist(struct perf_sched *sched)
+{
+ const struct perf_evsel_str_handler handlers[] = {
+ { "sched:sched_switch", timehist_sched_switch_event, },
+ { "sched:sched_wakeup", timehist_sched_wakeup_event, },
+ { "sched:sched_wakeup_new", timehist_sched_wakeup_event, },
+ };
+ const struct perf_evsel_str_handler migrate_handlers[] = {
+ { "sched:sched_migrate_task", timehist_migrate_task_event, },
+ };
+ struct perf_data data = {
+ .file = {
+ .path = input_name,
+ },
+ .mode = PERF_DATA_MODE_READ,
+ .force = sched->force,
+ };
+
+ struct perf_session *session;
+ struct perf_evlist *evlist;
+ int err = -1;
+
+ /*
+ * event handlers for timehist option
+ */
+ sched->tool.sample = perf_timehist__process_sample;
+ sched->tool.mmap = perf_event__process_mmap;
+ sched->tool.comm = perf_event__process_comm;
+ sched->tool.exit = perf_event__process_exit;
+ sched->tool.fork = perf_event__process_fork;
+ sched->tool.lost = process_lost;
+ sched->tool.attr = perf_event__process_attr;
+ sched->tool.tracing_data = perf_event__process_tracing_data;
+ sched->tool.build_id = perf_event__process_build_id;
+
+ sched->tool.ordered_events = true;
+ sched->tool.ordering_requires_timestamps = true;
+
+ symbol_conf.use_callchain = sched->show_callchain;
+
+ session = perf_session__new(&data, false, &sched->tool);
+ if (session == NULL)
+ return -ENOMEM;
+
+ evlist = session->evlist;
+
+ symbol__init(&session->header.env);
+
+ if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) {
+ pr_err("Invalid time string\n");
+ return -EINVAL;
+ }
+
+ if (timehist_check_attr(sched, evlist) != 0)
+ goto out;
+
+ setup_pager();
+
+ /* setup per-evsel handlers */
+ if (perf_session__set_tracepoints_handlers(session, handlers))
+ goto out;
+
+ /* sched_switch event at a minimum needs to exist */
+ if (!perf_evlist__find_tracepoint_by_name(session->evlist,
+ "sched:sched_switch")) {
+ pr_err("No sched_switch events found. Have you run 'perf sched record'?\n");
+ goto out;
+ }
+
+ if (sched->show_migrations &&
+ perf_session__set_tracepoints_handlers(session, migrate_handlers))
+ goto out;
+
+ /* pre-allocate struct for per-CPU idle stats */
+ sched->max_cpu = session->header.env.nr_cpus_online;
+ if (sched->max_cpu == 0)
+ sched->max_cpu = 4;
+ if (init_idle_threads(sched->max_cpu))
+ goto out;
+
+ /* summary_only implies summary option, but don't overwrite summary if set */
+ if (sched->summary_only)
+ sched->summary = sched->summary_only;
+
+ if (!sched->summary_only)
+ timehist_header(sched);
+
+ err = perf_session__process_events(session);
+ if (err) {
+ pr_err("Failed to process events, error %d", err);
+ goto out;
+ }
+
+ sched->nr_events = evlist->stats.nr_events[0];
+ sched->nr_lost_events = evlist->stats.total_lost;
+ sched->nr_lost_chunks = evlist->stats.nr_events[PERF_RECORD_LOST];
+
+ if (sched->summary)
+ timehist_print_summary(sched, session);
+
+out:
+ free_idle_threads();
+ perf_session__delete(session);
+
+ return err;
+}
+
+
+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 void __merge_work_atoms(struct rb_root *root, struct work_atoms *data)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+ struct work_atoms *this;
+ const char *comm = thread__comm_str(data->thread), *this_comm;
+
+ while (*new) {
+ int cmp;
+
+ this = container_of(*new, struct work_atoms, node);
+ parent = *new;
+
+ this_comm = thread__comm_str(this->thread);
+ cmp = strcmp(comm, this_comm);
+ if (cmp > 0) {
+ new = &((*new)->rb_left);
+ } else if (cmp < 0) {
+ new = &((*new)->rb_right);
+ } else {
+ this->num_merged++;
+ this->total_runtime += data->total_runtime;
+ this->nb_atoms += data->nb_atoms;
+ this->total_lat += data->total_lat;
+ list_splice(&data->work_list, &this->work_list);
+ if (this->max_lat < data->max_lat) {
+ this->max_lat = data->max_lat;
+ this->max_lat_at = data->max_lat_at;
+ }
+ zfree(&data);
+ return;
+ }
+ }
+
+ data->num_merged++;
+ rb_link_node(&data->node, parent, new);
+ rb_insert_color(&data->node, root);
+}
+
+static void perf_sched__merge_lat(struct perf_sched *sched)
+{
+ struct work_atoms *data;
+ struct rb_node *node;
+
+ if (sched->skip_merge)
+ return;
+
+ while ((node = rb_first(&sched->atom_root))) {
+ rb_erase(node, &sched->atom_root);
+ data = rb_entry(node, struct work_atoms, node);
+ __merge_work_atoms(&sched->merged_atom_root, data);
+ }
+}
+
+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__merge_lat(sched);
+ 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 / NSEC_PER_MSEC, sched->all_count);
+
+ printf(" ---------------------------------------------------\n");
+
+ print_bad_events(sched);
+ printf("\n");
+
+ return 0;
+}
+
+static int setup_map_cpus(struct perf_sched *sched)
+{
+ struct cpu_map *map;
+
+ sched->max_cpu = sysconf(_SC_NPROCESSORS_CONF);
+
+ if (sched->map.comp) {
+ sched->map.comp_cpus = zalloc(sched->max_cpu * sizeof(int));
+ if (!sched->map.comp_cpus)
+ return -1;
+ }
+
+ if (!sched->map.cpus_str)
+ return 0;
+
+ map = cpu_map__new(sched->map.cpus_str);
+ if (!map) {
+ pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
+ return -1;
+ }
+
+ sched->map.cpus = map;
+ return 0;
+}
+
+static int setup_color_pids(struct perf_sched *sched)
+{
+ struct thread_map *map;
+
+ if (!sched->map.color_pids_str)
+ return 0;
+
+ map = thread_map__new_by_tid_str(sched->map.color_pids_str);
+ if (!map) {
+ pr_err("failed to get thread map from %s\n", sched->map.color_pids_str);
+ return -1;
+ }
+
+ sched->map.color_pids = map;
+ return 0;
+}
+
+static int setup_color_cpus(struct perf_sched *sched)
+{
+ struct cpu_map *map;
+
+ if (!sched->map.color_cpus_str)
+ return 0;
+
+ map = cpu_map__new(sched->map.color_cpus_str);
+ if (!map) {
+ pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str);
+ return -1;
+ }
+
+ sched->map.color_cpus = map;
+ return 0;
+}
+
+static int perf_sched__map(struct perf_sched *sched)
+{
+ if (setup_map_cpus(sched))
+ return -1;
+
+ if (setup_color_pids(sched))
+ return -1;
+
+ if (setup_color_cpus(sched))
+ return -1;
+
+ 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) {
+ usage_with_options_msg(usage_msg, options,
+ "Unknown --sort key: `%s'", tok);
+ }
+ }
+
+ 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);
+}
+
+int cmd_sched(int argc, const char **argv)
+{
+ const char default_sort_order[] = "avg, max, switch, runtime";
+ struct perf_sched sched = {
+ .tool = {
+ .sample = perf_sched__process_tracepoint_sample,
+ .comm = perf_sched__process_comm,
+ .namespaces = perf_event__process_namespaces,
+ .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',
+ .skip_merge = 0,
+ .show_callchain = 1,
+ .max_stack = 5,
+ };
+ 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_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
+ OPT_END()
+ };
+ const struct option latency_options[] = {
+ OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
+ "sort by key(s): runtime, switch, avg, max"),
+ OPT_INTEGER('C', "CPU", &sched.profile_cpu,
+ "CPU to profile on"),
+ OPT_BOOLEAN('p', "pids", &sched.skip_merge,
+ "latency stats per pid instead of per comm"),
+ OPT_PARENT(sched_options)
+ };
+ const struct option replay_options[] = {
+ OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
+ "repeat the workload replay N times (-1: infinite)"),
+ OPT_PARENT(sched_options)
+ };
+ const struct option map_options[] = {
+ OPT_BOOLEAN(0, "compact", &sched.map.comp,
+ "map output in compact mode"),
+ OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids",
+ "highlight given pids in map"),
+ OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus",
+ "highlight given CPUs in map"),
+ OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
+ "display given CPUs in map"),
+ OPT_PARENT(sched_options)
+ };
+ const struct option timehist_options[] = {
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
+ OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
+ "file", "kallsyms pathname"),
+ OPT_BOOLEAN('g', "call-graph", &sched.show_callchain,
+ "Display call chains if present (default on)"),
+ OPT_UINTEGER(0, "max-stack", &sched.max_stack,
+ "Maximum number of functions to display backtrace."),
+ OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
+ "Look for files with symbols relative to this directory"),
+ OPT_BOOLEAN('s', "summary", &sched.summary_only,
+ "Show only syscall summary with statistics"),
+ OPT_BOOLEAN('S', "with-summary", &sched.summary,
+ "Show all syscalls and summary with statistics"),
+ OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
+ OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"),
+ OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
+ OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
+ OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"),
+ OPT_STRING(0, "time", &sched.time_str, "str",
+ "Time span for analysis (start,stop)"),
+ OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"),
+ OPT_STRING('p', "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
+ "analyze events only for given process id(s)"),
+ OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
+ "analyze events only for given thread id(s)"),
+ OPT_PARENT(sched_options)
+ };
+
+ const char * const latency_usage[] = {
+ "perf sched latency [<options>]",
+ NULL
+ };
+ const char * const replay_usage[] = {
+ "perf sched replay [<options>]",
+ NULL
+ };
+ const char * const map_usage[] = {
+ "perf sched map [<options>]",
+ NULL
+ };
+ const char * const timehist_usage[] = {
+ "perf sched timehist [<options>]",
+ NULL
+ };
+ const char *const sched_subcommands[] = { "record", "latency", "map",
+ "replay", "script",
+ "timehist", 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);
+
+ 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")) {
+ if (argc) {
+ argc = parse_options(argc, argv, map_options, map_usage, 0);
+ if (argc)
+ usage_with_options(map_usage, map_options);
+ }
+ 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 if (!strcmp(argv[0], "timehist")) {
+ if (argc) {
+ argc = parse_options(argc, argv, timehist_options,
+ timehist_usage, 0);
+ if (argc)
+ usage_with_options(timehist_usage, timehist_options);
+ }
+ if ((sched.show_wakeups || sched.show_next) &&
+ sched.summary_only) {
+ pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
+ parse_options_usage(timehist_usage, timehist_options, "s", true);
+ if (sched.show_wakeups)
+ parse_options_usage(NULL, timehist_options, "w", true);
+ if (sched.show_next)
+ parse_options_usage(NULL, timehist_options, "n", true);
+ return -EINVAL;
+ }
+
+ return perf_sched__timehist(&sched);
+ } else {
+ usage_with_options(sched_usage, sched_options);
+ }
+
+ return 0;
+}