![Ian Munsie](/assets/img/avatar_default.png)
If we are running the new perf on an old kernel without support for sample_id_all, we should fall back to the old unordered processing of events. If we didn't than we would *always* process events without timestamps out of order, whether or not we hit a reordering race. In other words, instead of there being a chance of not attributing samples correctly, we would guarantee that samples would not be attributed. While processing all events without timestamps before events with timestamps may seem like an intuitive solution, it falls down as PERF_RECORD_EXIT events would also be processed before any samples. Even with a workaround for that case, samples before/after an exec would not be attributed correctly. This patch allows commands to indicate whether they need to fall back to unordered processing, so that commands that do not care about timestamps on every event will not be affected. If we do fallback, this will print out a warning if report -D was invoked. This patch adds the test in perf_session__new so that we only need to test once per session. Commands that do not use an event_ops (such as record and top) can simply pass NULL in it's place. Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <1291951882-sup-6069@au1.ibm.com> Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1921 lines
43 KiB
C
1921 lines
43 KiB
C
#include "builtin.h"
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#include "perf.h"
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#include "util/util.h"
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#include "util/cache.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/header.h"
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#include "util/session.h"
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#include "util/parse-options.h"
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#include "util/trace-event.h"
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#include "util/debug.h"
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#include <sys/prctl.h>
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#include <semaphore.h>
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#include <pthread.h>
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#include <math.h>
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static char const *input_name = "perf.data";
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static char default_sort_order[] = "avg, max, switch, runtime";
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static const char *sort_order = default_sort_order;
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static int profile_cpu = -1;
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#define PR_SET_NAME 15 /* Set process name */
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#define MAX_CPUS 4096
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static u64 run_measurement_overhead;
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static u64 sleep_measurement_overhead;
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#define COMM_LEN 20
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#define SYM_LEN 129
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#define MAX_PID 65536
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static unsigned long nr_tasks;
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struct sched_atom;
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struct task_desc {
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unsigned long nr;
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unsigned long pid;
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char comm[COMM_LEN];
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unsigned long nr_events;
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unsigned long curr_event;
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struct sched_atom **atoms;
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pthread_t thread;
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sem_t sleep_sem;
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sem_t ready_for_work;
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sem_t work_done_sem;
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u64 cpu_usage;
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};
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enum sched_event_type {
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SCHED_EVENT_RUN,
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SCHED_EVENT_SLEEP,
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SCHED_EVENT_WAKEUP,
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SCHED_EVENT_MIGRATION,
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};
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struct sched_atom {
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enum sched_event_type type;
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int specific_wait;
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u64 timestamp;
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u64 duration;
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unsigned long nr;
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sem_t *wait_sem;
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struct task_desc *wakee;
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};
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static struct task_desc *pid_to_task[MAX_PID];
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static struct task_desc **tasks;
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static pthread_mutex_t start_work_mutex = PTHREAD_MUTEX_INITIALIZER;
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static u64 start_time;
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static pthread_mutex_t work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER;
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static unsigned long nr_run_events;
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static unsigned long nr_sleep_events;
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static unsigned long nr_wakeup_events;
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static unsigned long nr_sleep_corrections;
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static unsigned long nr_run_events_optimized;
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static unsigned long targetless_wakeups;
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static unsigned long multitarget_wakeups;
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static u64 cpu_usage;
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static u64 runavg_cpu_usage;
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static u64 parent_cpu_usage;
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static u64 runavg_parent_cpu_usage;
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static unsigned long nr_runs;
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static u64 sum_runtime;
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static u64 sum_fluct;
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static u64 run_avg;
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static unsigned int replay_repeat = 10;
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static unsigned long nr_timestamps;
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static unsigned long nr_unordered_timestamps;
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static unsigned long nr_state_machine_bugs;
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static unsigned long nr_context_switch_bugs;
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static unsigned long nr_events;
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static unsigned long nr_lost_chunks;
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static unsigned long nr_lost_events;
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#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
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enum thread_state {
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THREAD_SLEEPING = 0,
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THREAD_WAIT_CPU,
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THREAD_SCHED_IN,
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THREAD_IGNORE
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};
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struct work_atom {
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struct list_head list;
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enum thread_state state;
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u64 sched_out_time;
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u64 wake_up_time;
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u64 sched_in_time;
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u64 runtime;
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};
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struct work_atoms {
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struct list_head work_list;
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struct thread *thread;
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struct rb_node node;
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u64 max_lat;
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u64 max_lat_at;
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u64 total_lat;
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u64 nb_atoms;
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u64 total_runtime;
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};
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typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
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static struct rb_root atom_root, sorted_atom_root;
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static u64 all_runtime;
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static u64 all_count;
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static u64 get_nsecs(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
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}
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static void burn_nsecs(u64 nsecs)
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{
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u64 T0 = get_nsecs(), T1;
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do {
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T1 = get_nsecs();
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} while (T1 + run_measurement_overhead < T0 + nsecs);
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}
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static void sleep_nsecs(u64 nsecs)
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{
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struct timespec ts;
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ts.tv_nsec = nsecs % 999999999;
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ts.tv_sec = nsecs / 999999999;
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nanosleep(&ts, NULL);
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}
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static void calibrate_run_measurement_overhead(void)
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{
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u64 T0, T1, delta, min_delta = 1000000000ULL;
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int i;
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for (i = 0; i < 10; i++) {
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T0 = get_nsecs();
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burn_nsecs(0);
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T1 = get_nsecs();
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delta = T1-T0;
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min_delta = min(min_delta, delta);
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}
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run_measurement_overhead = min_delta;
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printf("run measurement overhead: %Ld nsecs\n", min_delta);
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}
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static void calibrate_sleep_measurement_overhead(void)
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{
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u64 T0, T1, delta, min_delta = 1000000000ULL;
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int i;
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for (i = 0; i < 10; i++) {
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T0 = get_nsecs();
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sleep_nsecs(10000);
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T1 = get_nsecs();
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delta = T1-T0;
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min_delta = min(min_delta, delta);
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}
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min_delta -= 10000;
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sleep_measurement_overhead = min_delta;
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printf("sleep measurement overhead: %Ld nsecs\n", min_delta);
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}
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static struct sched_atom *
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get_new_event(struct task_desc *task, u64 timestamp)
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{
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struct sched_atom *event = zalloc(sizeof(*event));
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unsigned long idx = task->nr_events;
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size_t size;
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event->timestamp = timestamp;
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event->nr = idx;
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task->nr_events++;
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size = sizeof(struct sched_atom *) * task->nr_events;
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task->atoms = realloc(task->atoms, size);
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BUG_ON(!task->atoms);
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task->atoms[idx] = event;
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return event;
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}
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static struct sched_atom *last_event(struct task_desc *task)
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{
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if (!task->nr_events)
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return NULL;
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return task->atoms[task->nr_events - 1];
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}
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static void
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add_sched_event_run(struct task_desc *task, u64 timestamp, u64 duration)
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{
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struct sched_atom *event, *curr_event = last_event(task);
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/*
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* optimize an existing RUN event by merging this one
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* to it:
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*/
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if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
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nr_run_events_optimized++;
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curr_event->duration += duration;
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return;
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}
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event = get_new_event(task, timestamp);
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event->type = SCHED_EVENT_RUN;
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event->duration = duration;
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nr_run_events++;
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}
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static void
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add_sched_event_wakeup(struct task_desc *task, u64 timestamp,
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struct task_desc *wakee)
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{
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struct sched_atom *event, *wakee_event;
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event = get_new_event(task, timestamp);
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event->type = SCHED_EVENT_WAKEUP;
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event->wakee = wakee;
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wakee_event = last_event(wakee);
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if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
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targetless_wakeups++;
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return;
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}
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if (wakee_event->wait_sem) {
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multitarget_wakeups++;
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return;
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}
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wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
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sem_init(wakee_event->wait_sem, 0, 0);
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wakee_event->specific_wait = 1;
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event->wait_sem = wakee_event->wait_sem;
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nr_wakeup_events++;
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}
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static void
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add_sched_event_sleep(struct task_desc *task, u64 timestamp,
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u64 task_state __used)
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{
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struct sched_atom *event = get_new_event(task, timestamp);
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event->type = SCHED_EVENT_SLEEP;
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nr_sleep_events++;
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}
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static struct task_desc *register_pid(unsigned long pid, const char *comm)
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{
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struct task_desc *task;
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BUG_ON(pid >= MAX_PID);
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task = pid_to_task[pid];
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if (task)
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return task;
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task = zalloc(sizeof(*task));
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task->pid = pid;
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task->nr = nr_tasks;
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strcpy(task->comm, comm);
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/*
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* every task starts in sleeping state - this gets ignored
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* if there's no wakeup pointing to this sleep state:
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*/
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add_sched_event_sleep(task, 0, 0);
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pid_to_task[pid] = task;
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nr_tasks++;
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tasks = realloc(tasks, nr_tasks*sizeof(struct task_task *));
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BUG_ON(!tasks);
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tasks[task->nr] = task;
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if (verbose)
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printf("registered task #%ld, PID %ld (%s)\n", nr_tasks, pid, comm);
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return task;
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}
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static void print_task_traces(void)
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{
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struct task_desc *task;
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unsigned long i;
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for (i = 0; i < nr_tasks; i++) {
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task = tasks[i];
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printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
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task->nr, task->comm, task->pid, task->nr_events);
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}
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}
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static void add_cross_task_wakeups(void)
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{
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struct task_desc *task1, *task2;
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unsigned long i, j;
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for (i = 0; i < nr_tasks; i++) {
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task1 = tasks[i];
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j = i + 1;
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if (j == nr_tasks)
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j = 0;
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task2 = tasks[j];
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add_sched_event_wakeup(task1, 0, task2);
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}
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}
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static void
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process_sched_event(struct task_desc *this_task __used, struct sched_atom *atom)
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{
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int ret = 0;
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u64 now;
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long long delta;
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now = get_nsecs();
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delta = start_time + atom->timestamp - now;
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switch (atom->type) {
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case SCHED_EVENT_RUN:
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burn_nsecs(atom->duration);
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break;
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case SCHED_EVENT_SLEEP:
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if (atom->wait_sem)
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ret = sem_wait(atom->wait_sem);
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BUG_ON(ret);
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break;
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case SCHED_EVENT_WAKEUP:
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if (atom->wait_sem)
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ret = sem_post(atom->wait_sem);
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BUG_ON(ret);
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break;
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case SCHED_EVENT_MIGRATION:
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break;
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default:
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BUG_ON(1);
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}
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}
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static u64 get_cpu_usage_nsec_parent(void)
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{
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struct rusage ru;
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u64 sum;
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int err;
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err = getrusage(RUSAGE_SELF, &ru);
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BUG_ON(err);
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sum = ru.ru_utime.tv_sec*1e9 + ru.ru_utime.tv_usec*1e3;
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sum += ru.ru_stime.tv_sec*1e9 + ru.ru_stime.tv_usec*1e3;
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return sum;
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}
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static int self_open_counters(void)
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{
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struct perf_event_attr attr;
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int fd;
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memset(&attr, 0, sizeof(attr));
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attr.type = PERF_TYPE_SOFTWARE;
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attr.config = PERF_COUNT_SW_TASK_CLOCK;
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fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
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if (fd < 0)
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die("Error: sys_perf_event_open() syscall returned"
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"with %d (%s)\n", fd, strerror(errno));
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return fd;
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}
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static u64 get_cpu_usage_nsec_self(int fd)
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{
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u64 runtime;
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int ret;
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ret = read(fd, &runtime, sizeof(runtime));
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BUG_ON(ret != sizeof(runtime));
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return runtime;
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}
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static void *thread_func(void *ctx)
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{
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struct task_desc *this_task = ctx;
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u64 cpu_usage_0, cpu_usage_1;
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unsigned long i, ret;
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char comm2[22];
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int fd;
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sprintf(comm2, ":%s", this_task->comm);
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prctl(PR_SET_NAME, comm2);
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fd = self_open_counters();
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again:
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ret = sem_post(&this_task->ready_for_work);
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BUG_ON(ret);
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ret = pthread_mutex_lock(&start_work_mutex);
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BUG_ON(ret);
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ret = pthread_mutex_unlock(&start_work_mutex);
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BUG_ON(ret);
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cpu_usage_0 = get_cpu_usage_nsec_self(fd);
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for (i = 0; i < this_task->nr_events; i++) {
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this_task->curr_event = i;
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process_sched_event(this_task, this_task->atoms[i]);
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}
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cpu_usage_1 = get_cpu_usage_nsec_self(fd);
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this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
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ret = sem_post(&this_task->work_done_sem);
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BUG_ON(ret);
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ret = pthread_mutex_lock(&work_done_wait_mutex);
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BUG_ON(ret);
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ret = pthread_mutex_unlock(&work_done_wait_mutex);
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BUG_ON(ret);
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goto again;
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}
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static void create_tasks(void)
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{
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struct task_desc *task;
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pthread_attr_t attr;
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unsigned long i;
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int err;
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err = pthread_attr_init(&attr);
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BUG_ON(err);
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err = pthread_attr_setstacksize(&attr, (size_t)(16*1024));
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BUG_ON(err);
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err = pthread_mutex_lock(&start_work_mutex);
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BUG_ON(err);
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err = pthread_mutex_lock(&work_done_wait_mutex);
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BUG_ON(err);
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for (i = 0; i < nr_tasks; i++) {
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task = tasks[i];
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sem_init(&task->sleep_sem, 0, 0);
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sem_init(&task->ready_for_work, 0, 0);
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sem_init(&task->work_done_sem, 0, 0);
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task->curr_event = 0;
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err = pthread_create(&task->thread, &attr, thread_func, task);
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BUG_ON(err);
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}
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}
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static void wait_for_tasks(void)
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{
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u64 cpu_usage_0, cpu_usage_1;
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struct task_desc *task;
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unsigned long i, ret;
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start_time = get_nsecs();
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cpu_usage = 0;
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pthread_mutex_unlock(&work_done_wait_mutex);
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for (i = 0; i < nr_tasks; i++) {
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task = tasks[i];
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ret = sem_wait(&task->ready_for_work);
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BUG_ON(ret);
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sem_init(&task->ready_for_work, 0, 0);
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}
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ret = pthread_mutex_lock(&work_done_wait_mutex);
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BUG_ON(ret);
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cpu_usage_0 = get_cpu_usage_nsec_parent();
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pthread_mutex_unlock(&start_work_mutex);
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for (i = 0; i < nr_tasks; i++) {
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task = tasks[i];
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ret = sem_wait(&task->work_done_sem);
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BUG_ON(ret);
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sem_init(&task->work_done_sem, 0, 0);
|
|
cpu_usage += task->cpu_usage;
|
|
task->cpu_usage = 0;
|
|
}
|
|
|
|
cpu_usage_1 = get_cpu_usage_nsec_parent();
|
|
if (!runavg_cpu_usage)
|
|
runavg_cpu_usage = cpu_usage;
|
|
runavg_cpu_usage = (runavg_cpu_usage*9 + cpu_usage)/10;
|
|
|
|
parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
|
|
if (!runavg_parent_cpu_usage)
|
|
runavg_parent_cpu_usage = parent_cpu_usage;
|
|
runavg_parent_cpu_usage = (runavg_parent_cpu_usage*9 +
|
|
parent_cpu_usage)/10;
|
|
|
|
ret = pthread_mutex_lock(&start_work_mutex);
|
|
BUG_ON(ret);
|
|
|
|
for (i = 0; i < nr_tasks; i++) {
|
|
task = tasks[i];
|
|
sem_init(&task->sleep_sem, 0, 0);
|
|
task->curr_event = 0;
|
|
}
|
|
}
|
|
|
|
static void run_one_test(void)
|
|
{
|
|
u64 T0, T1, delta, avg_delta, fluct, std_dev;
|
|
|
|
T0 = get_nsecs();
|
|
wait_for_tasks();
|
|
T1 = get_nsecs();
|
|
|
|
delta = T1 - T0;
|
|
sum_runtime += delta;
|
|
nr_runs++;
|
|
|
|
avg_delta = sum_runtime / nr_runs;
|
|
if (delta < avg_delta)
|
|
fluct = avg_delta - delta;
|
|
else
|
|
fluct = delta - avg_delta;
|
|
sum_fluct += fluct;
|
|
std_dev = sum_fluct / nr_runs / sqrt(nr_runs);
|
|
if (!run_avg)
|
|
run_avg = delta;
|
|
run_avg = (run_avg*9 + delta)/10;
|
|
|
|
printf("#%-3ld: %0.3f, ",
|
|
nr_runs, (double)delta/1000000.0);
|
|
|
|
printf("ravg: %0.2f, ",
|
|
(double)run_avg/1e6);
|
|
|
|
printf("cpu: %0.2f / %0.2f",
|
|
(double)cpu_usage/1e6, (double)runavg_cpu_usage/1e6);
|
|
|
|
#if 0
|
|
/*
|
|
* rusage statistics done by the parent, these are less
|
|
* accurate than the sum_exec_runtime based statistics:
|
|
*/
|
|
printf(" [%0.2f / %0.2f]",
|
|
(double)parent_cpu_usage/1e6,
|
|
(double)runavg_parent_cpu_usage/1e6);
|
|
#endif
|
|
|
|
printf("\n");
|
|
|
|
if (nr_sleep_corrections)
|
|
printf(" (%ld sleep corrections)\n", nr_sleep_corrections);
|
|
nr_sleep_corrections = 0;
|
|
}
|
|
|
|
static void test_calibrations(void)
|
|
{
|
|
u64 T0, T1;
|
|
|
|
T0 = get_nsecs();
|
|
burn_nsecs(1e6);
|
|
T1 = get_nsecs();
|
|
|
|
printf("the run test took %Ld nsecs\n", T1-T0);
|
|
|
|
T0 = get_nsecs();
|
|
sleep_nsecs(1e6);
|
|
T1 = get_nsecs();
|
|
|
|
printf("the sleep test took %Ld nsecs\n", T1-T0);
|
|
}
|
|
|
|
#define FILL_FIELD(ptr, field, event, data) \
|
|
ptr.field = (typeof(ptr.field)) raw_field_value(event, #field, data)
|
|
|
|
#define FILL_ARRAY(ptr, array, event, data) \
|
|
do { \
|
|
void *__array = raw_field_ptr(event, #array, data); \
|
|
memcpy(ptr.array, __array, sizeof(ptr.array)); \
|
|
} while(0)
|
|
|
|
#define FILL_COMMON_FIELDS(ptr, event, data) \
|
|
do { \
|
|
FILL_FIELD(ptr, common_type, event, data); \
|
|
FILL_FIELD(ptr, common_flags, event, data); \
|
|
FILL_FIELD(ptr, common_preempt_count, event, data); \
|
|
FILL_FIELD(ptr, common_pid, event, data); \
|
|
FILL_FIELD(ptr, common_tgid, event, data); \
|
|
} while (0)
|
|
|
|
|
|
|
|
struct trace_switch_event {
|
|
u32 size;
|
|
|
|
u16 common_type;
|
|
u8 common_flags;
|
|
u8 common_preempt_count;
|
|
u32 common_pid;
|
|
u32 common_tgid;
|
|
|
|
char prev_comm[16];
|
|
u32 prev_pid;
|
|
u32 prev_prio;
|
|
u64 prev_state;
|
|
char next_comm[16];
|
|
u32 next_pid;
|
|
u32 next_prio;
|
|
};
|
|
|
|
struct trace_runtime_event {
|
|
u32 size;
|
|
|
|
u16 common_type;
|
|
u8 common_flags;
|
|
u8 common_preempt_count;
|
|
u32 common_pid;
|
|
u32 common_tgid;
|
|
|
|
char comm[16];
|
|
u32 pid;
|
|
u64 runtime;
|
|
u64 vruntime;
|
|
};
|
|
|
|
struct trace_wakeup_event {
|
|
u32 size;
|
|
|
|
u16 common_type;
|
|
u8 common_flags;
|
|
u8 common_preempt_count;
|
|
u32 common_pid;
|
|
u32 common_tgid;
|
|
|
|
char comm[16];
|
|
u32 pid;
|
|
|
|
u32 prio;
|
|
u32 success;
|
|
u32 cpu;
|
|
};
|
|
|
|
struct trace_fork_event {
|
|
u32 size;
|
|
|
|
u16 common_type;
|
|
u8 common_flags;
|
|
u8 common_preempt_count;
|
|
u32 common_pid;
|
|
u32 common_tgid;
|
|
|
|
char parent_comm[16];
|
|
u32 parent_pid;
|
|
char child_comm[16];
|
|
u32 child_pid;
|
|
};
|
|
|
|
struct trace_migrate_task_event {
|
|
u32 size;
|
|
|
|
u16 common_type;
|
|
u8 common_flags;
|
|
u8 common_preempt_count;
|
|
u32 common_pid;
|
|
u32 common_tgid;
|
|
|
|
char comm[16];
|
|
u32 pid;
|
|
|
|
u32 prio;
|
|
u32 cpu;
|
|
};
|
|
|
|
struct trace_sched_handler {
|
|
void (*switch_event)(struct trace_switch_event *,
|
|
struct perf_session *,
|
|
struct event *,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread);
|
|
|
|
void (*runtime_event)(struct trace_runtime_event *,
|
|
struct perf_session *,
|
|
struct event *,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread);
|
|
|
|
void (*wakeup_event)(struct trace_wakeup_event *,
|
|
struct perf_session *,
|
|
struct event *,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread);
|
|
|
|
void (*fork_event)(struct trace_fork_event *,
|
|
struct event *,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread);
|
|
|
|
void (*migrate_task_event)(struct trace_migrate_task_event *,
|
|
struct perf_session *session,
|
|
struct event *,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread);
|
|
};
|
|
|
|
|
|
static void
|
|
replay_wakeup_event(struct trace_wakeup_event *wakeup_event,
|
|
struct perf_session *session __used,
|
|
struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
struct task_desc *waker, *wakee;
|
|
|
|
if (verbose) {
|
|
printf("sched_wakeup event %p\n", event);
|
|
|
|
printf(" ... pid %d woke up %s/%d\n",
|
|
wakeup_event->common_pid,
|
|
wakeup_event->comm,
|
|
wakeup_event->pid);
|
|
}
|
|
|
|
waker = register_pid(wakeup_event->common_pid, "<unknown>");
|
|
wakee = register_pid(wakeup_event->pid, wakeup_event->comm);
|
|
|
|
add_sched_event_wakeup(waker, timestamp, wakee);
|
|
}
|
|
|
|
static u64 cpu_last_switched[MAX_CPUS];
|
|
|
|
static void
|
|
replay_switch_event(struct trace_switch_event *switch_event,
|
|
struct perf_session *session __used,
|
|
struct event *event,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread __used)
|
|
{
|
|
struct task_desc *prev, *next;
|
|
u64 timestamp0;
|
|
s64 delta;
|
|
|
|
if (verbose)
|
|
printf("sched_switch event %p\n", event);
|
|
|
|
if (cpu >= MAX_CPUS || cpu < 0)
|
|
return;
|
|
|
|
timestamp0 = cpu_last_switched[cpu];
|
|
if (timestamp0)
|
|
delta = timestamp - timestamp0;
|
|
else
|
|
delta = 0;
|
|
|
|
if (delta < 0)
|
|
die("hm, delta: %Ld < 0 ?\n", delta);
|
|
|
|
if (verbose) {
|
|
printf(" ... switch from %s/%d to %s/%d [ran %Ld nsecs]\n",
|
|
switch_event->prev_comm, switch_event->prev_pid,
|
|
switch_event->next_comm, switch_event->next_pid,
|
|
delta);
|
|
}
|
|
|
|
prev = register_pid(switch_event->prev_pid, switch_event->prev_comm);
|
|
next = register_pid(switch_event->next_pid, switch_event->next_comm);
|
|
|
|
cpu_last_switched[cpu] = timestamp;
|
|
|
|
add_sched_event_run(prev, timestamp, delta);
|
|
add_sched_event_sleep(prev, timestamp, switch_event->prev_state);
|
|
}
|
|
|
|
|
|
static void
|
|
replay_fork_event(struct trace_fork_event *fork_event,
|
|
struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
if (verbose) {
|
|
printf("sched_fork event %p\n", event);
|
|
printf("... parent: %s/%d\n", fork_event->parent_comm, fork_event->parent_pid);
|
|
printf("... child: %s/%d\n", fork_event->child_comm, fork_event->child_pid);
|
|
}
|
|
register_pid(fork_event->parent_pid, fork_event->parent_comm);
|
|
register_pid(fork_event->child_pid, fork_event->child_comm);
|
|
}
|
|
|
|
static struct trace_sched_handler replay_ops = {
|
|
.wakeup_event = replay_wakeup_event,
|
|
.switch_event = replay_switch_event,
|
|
.fork_event = replay_fork_event,
|
|
};
|
|
|
|
struct sort_dimension {
|
|
const char *name;
|
|
sort_fn_t cmp;
|
|
struct list_head list;
|
|
};
|
|
|
|
static LIST_HEAD(cmp_pid);
|
|
|
|
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 void thread_atoms_insert(struct thread *thread)
|
|
{
|
|
struct work_atoms *atoms = zalloc(sizeof(*atoms));
|
|
if (!atoms)
|
|
die("No memory");
|
|
|
|
atoms->thread = thread;
|
|
INIT_LIST_HEAD(&atoms->work_list);
|
|
__thread_latency_insert(&atom_root, atoms, &cmp_pid);
|
|
}
|
|
|
|
static void
|
|
latency_fork_event(struct trace_fork_event *fork_event __used,
|
|
struct event *event __used,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
/* should insert the newcomer */
|
|
}
|
|
|
|
__used
|
|
static char sched_out_state(struct trace_switch_event *switch_event)
|
|
{
|
|
const char *str = TASK_STATE_TO_CHAR_STR;
|
|
|
|
return str[switch_event->prev_state];
|
|
}
|
|
|
|
static void
|
|
add_sched_out_event(struct work_atoms *atoms,
|
|
char run_state,
|
|
u64 timestamp)
|
|
{
|
|
struct work_atom *atom = zalloc(sizeof(*atom));
|
|
if (!atom)
|
|
die("Non memory");
|
|
|
|
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);
|
|
}
|
|
|
|
static void
|
|
add_runtime_event(struct work_atoms *atoms, u64 delta, u64 timestamp __used)
|
|
{
|
|
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 void
|
|
latency_switch_event(struct trace_switch_event *switch_event,
|
|
struct perf_session *session,
|
|
struct event *event __used,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *thread __used)
|
|
{
|
|
struct work_atoms *out_events, *in_events;
|
|
struct thread *sched_out, *sched_in;
|
|
u64 timestamp0;
|
|
s64 delta;
|
|
|
|
BUG_ON(cpu >= MAX_CPUS || cpu < 0);
|
|
|
|
timestamp0 = cpu_last_switched[cpu];
|
|
cpu_last_switched[cpu] = timestamp;
|
|
if (timestamp0)
|
|
delta = timestamp - timestamp0;
|
|
else
|
|
delta = 0;
|
|
|
|
if (delta < 0)
|
|
die("hm, delta: %Ld < 0 ?\n", delta);
|
|
|
|
|
|
sched_out = perf_session__findnew(session, switch_event->prev_pid);
|
|
sched_in = perf_session__findnew(session, switch_event->next_pid);
|
|
|
|
out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
|
|
if (!out_events) {
|
|
thread_atoms_insert(sched_out);
|
|
out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
|
|
if (!out_events)
|
|
die("out-event: Internal tree error");
|
|
}
|
|
add_sched_out_event(out_events, sched_out_state(switch_event), timestamp);
|
|
|
|
in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
|
|
if (!in_events) {
|
|
thread_atoms_insert(sched_in);
|
|
in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
|
|
if (!in_events)
|
|
die("in-event: Internal tree error");
|
|
/*
|
|
* Take came in we have not heard about yet,
|
|
* add in an initial atom in runnable state:
|
|
*/
|
|
add_sched_out_event(in_events, 'R', timestamp);
|
|
}
|
|
add_sched_in_event(in_events, timestamp);
|
|
}
|
|
|
|
static void
|
|
latency_runtime_event(struct trace_runtime_event *runtime_event,
|
|
struct perf_session *session,
|
|
struct event *event __used,
|
|
int cpu,
|
|
u64 timestamp,
|
|
struct thread *this_thread __used)
|
|
{
|
|
struct thread *thread = perf_session__findnew(session, runtime_event->pid);
|
|
struct work_atoms *atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
|
|
|
|
BUG_ON(cpu >= MAX_CPUS || cpu < 0);
|
|
if (!atoms) {
|
|
thread_atoms_insert(thread);
|
|
atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
|
|
if (!atoms)
|
|
die("in-event: Internal tree error");
|
|
add_sched_out_event(atoms, 'R', timestamp);
|
|
}
|
|
|
|
add_runtime_event(atoms, runtime_event->runtime, timestamp);
|
|
}
|
|
|
|
static void
|
|
latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
|
|
struct perf_session *session,
|
|
struct event *__event __used,
|
|
int cpu __used,
|
|
u64 timestamp,
|
|
struct thread *thread __used)
|
|
{
|
|
struct work_atoms *atoms;
|
|
struct work_atom *atom;
|
|
struct thread *wakee;
|
|
|
|
/* Note for later, it may be interesting to observe the failing cases */
|
|
if (!wakeup_event->success)
|
|
return;
|
|
|
|
wakee = perf_session__findnew(session, wakeup_event->pid);
|
|
atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
|
|
if (!atoms) {
|
|
thread_atoms_insert(wakee);
|
|
atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
|
|
if (!atoms)
|
|
die("wakeup-event: Internal tree error");
|
|
add_sched_out_event(atoms, 'S', timestamp);
|
|
}
|
|
|
|
BUG_ON(list_empty(&atoms->work_list));
|
|
|
|
atom = list_entry(atoms->work_list.prev, struct work_atom, list);
|
|
|
|
/*
|
|
* You WILL be missing events if you've recorded only
|
|
* one CPU, or are only looking at only one, so don't
|
|
* make useless noise.
|
|
*/
|
|
if (profile_cpu == -1 && atom->state != THREAD_SLEEPING)
|
|
nr_state_machine_bugs++;
|
|
|
|
nr_timestamps++;
|
|
if (atom->sched_out_time > timestamp) {
|
|
nr_unordered_timestamps++;
|
|
return;
|
|
}
|
|
|
|
atom->state = THREAD_WAIT_CPU;
|
|
atom->wake_up_time = timestamp;
|
|
}
|
|
|
|
static void
|
|
latency_migrate_task_event(struct trace_migrate_task_event *migrate_task_event,
|
|
struct perf_session *session,
|
|
struct event *__event __used,
|
|
int cpu __used,
|
|
u64 timestamp,
|
|
struct thread *thread __used)
|
|
{
|
|
struct work_atoms *atoms;
|
|
struct work_atom *atom;
|
|
struct thread *migrant;
|
|
|
|
/*
|
|
* Only need to worry about migration when profiling one CPU.
|
|
*/
|
|
if (profile_cpu == -1)
|
|
return;
|
|
|
|
migrant = perf_session__findnew(session, migrate_task_event->pid);
|
|
atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
|
|
if (!atoms) {
|
|
thread_atoms_insert(migrant);
|
|
register_pid(migrant->pid, migrant->comm);
|
|
atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
|
|
if (!atoms)
|
|
die("migration-event: Internal tree error");
|
|
add_sched_out_event(atoms, 'R', timestamp);
|
|
}
|
|
|
|
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;
|
|
|
|
nr_timestamps++;
|
|
|
|
if (atom->sched_out_time > timestamp)
|
|
nr_unordered_timestamps++;
|
|
}
|
|
|
|
static struct trace_sched_handler lat_ops = {
|
|
.wakeup_event = latency_wakeup_event,
|
|
.switch_event = latency_switch_event,
|
|
.runtime_event = latency_runtime_event,
|
|
.fork_event = latency_fork_event,
|
|
.migrate_task_event = latency_migrate_task_event,
|
|
};
|
|
|
|
static void output_lat_thread(struct work_atoms *work_list)
|
|
{
|
|
int i;
|
|
int ret;
|
|
u64 avg;
|
|
|
|
if (!work_list->nb_atoms)
|
|
return;
|
|
/*
|
|
* Ignore idle threads:
|
|
*/
|
|
if (!strcmp(work_list->thread->comm, "swapper"))
|
|
return;
|
|
|
|
all_runtime += work_list->total_runtime;
|
|
all_count += work_list->nb_atoms;
|
|
|
|
ret = printf(" %s:%d ", work_list->thread->comm, work_list->thread->pid);
|
|
|
|
for (i = 0; i < 24 - ret; i++)
|
|
printf(" ");
|
|
|
|
avg = work_list->total_lat / work_list->nb_atoms;
|
|
|
|
printf("|%11.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms | max at: %9.6f 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->pid < r->thread->pid)
|
|
return -1;
|
|
if (l->thread->pid > r->thread->pid)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension pid_sort_dimension = {
|
|
.name = "pid",
|
|
.cmp = pid_cmp,
|
|
};
|
|
|
|
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 struct sort_dimension avg_sort_dimension = {
|
|
.name = "avg",
|
|
.cmp = avg_cmp,
|
|
};
|
|
|
|
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 struct sort_dimension max_sort_dimension = {
|
|
.name = "max",
|
|
.cmp = max_cmp,
|
|
};
|
|
|
|
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 struct sort_dimension switch_sort_dimension = {
|
|
.name = "switch",
|
|
.cmp = switch_cmp,
|
|
};
|
|
|
|
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 struct sort_dimension runtime_sort_dimension = {
|
|
.name = "runtime",
|
|
.cmp = runtime_cmp,
|
|
};
|
|
|
|
static struct sort_dimension *available_sorts[] = {
|
|
&pid_sort_dimension,
|
|
&avg_sort_dimension,
|
|
&max_sort_dimension,
|
|
&switch_sort_dimension,
|
|
&runtime_sort_dimension,
|
|
};
|
|
|
|
#define NB_AVAILABLE_SORTS (int)(sizeof(available_sorts) / sizeof(struct sort_dimension *))
|
|
|
|
static LIST_HEAD(sort_list);
|
|
|
|
static int sort_dimension__add(const char *tok, struct list_head *list)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NB_AVAILABLE_SORTS; i++) {
|
|
if (!strcmp(available_sorts[i]->name, tok)) {
|
|
list_add_tail(&available_sorts[i]->list, list);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void setup_sorting(void);
|
|
|
|
static void sort_lat(void)
|
|
{
|
|
struct rb_node *node;
|
|
|
|
for (;;) {
|
|
struct work_atoms *data;
|
|
node = rb_first(&atom_root);
|
|
if (!node)
|
|
break;
|
|
|
|
rb_erase(node, &atom_root);
|
|
data = rb_entry(node, struct work_atoms, node);
|
|
__thread_latency_insert(&sorted_atom_root, data, &sort_list);
|
|
}
|
|
}
|
|
|
|
static struct trace_sched_handler *trace_handler;
|
|
|
|
static void
|
|
process_sched_wakeup_event(void *data, struct perf_session *session,
|
|
struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
struct trace_wakeup_event wakeup_event;
|
|
|
|
FILL_COMMON_FIELDS(wakeup_event, event, data);
|
|
|
|
FILL_ARRAY(wakeup_event, comm, event, data);
|
|
FILL_FIELD(wakeup_event, pid, event, data);
|
|
FILL_FIELD(wakeup_event, prio, event, data);
|
|
FILL_FIELD(wakeup_event, success, event, data);
|
|
FILL_FIELD(wakeup_event, cpu, event, data);
|
|
|
|
if (trace_handler->wakeup_event)
|
|
trace_handler->wakeup_event(&wakeup_event, session, event,
|
|
cpu, timestamp, thread);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int max_cpu;
|
|
|
|
static u32 curr_pid[MAX_CPUS] = { [0 ... MAX_CPUS-1] = -1 };
|
|
|
|
static struct thread *curr_thread[MAX_CPUS];
|
|
|
|
static char next_shortname1 = 'A';
|
|
static char next_shortname2 = '0';
|
|
|
|
static void
|
|
map_switch_event(struct trace_switch_event *switch_event,
|
|
struct perf_session *session,
|
|
struct event *event __used,
|
|
int this_cpu,
|
|
u64 timestamp,
|
|
struct thread *thread __used)
|
|
{
|
|
struct thread *sched_out, *sched_in;
|
|
int new_shortname;
|
|
u64 timestamp0;
|
|
s64 delta;
|
|
int cpu;
|
|
|
|
BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
|
|
|
|
if (this_cpu > max_cpu)
|
|
max_cpu = this_cpu;
|
|
|
|
timestamp0 = cpu_last_switched[this_cpu];
|
|
cpu_last_switched[this_cpu] = timestamp;
|
|
if (timestamp0)
|
|
delta = timestamp - timestamp0;
|
|
else
|
|
delta = 0;
|
|
|
|
if (delta < 0)
|
|
die("hm, delta: %Ld < 0 ?\n", delta);
|
|
|
|
|
|
sched_out = perf_session__findnew(session, switch_event->prev_pid);
|
|
sched_in = perf_session__findnew(session, switch_event->next_pid);
|
|
|
|
curr_thread[this_cpu] = sched_in;
|
|
|
|
printf(" ");
|
|
|
|
new_shortname = 0;
|
|
if (!sched_in->shortname[0]) {
|
|
sched_in->shortname[0] = next_shortname1;
|
|
sched_in->shortname[1] = next_shortname2;
|
|
|
|
if (next_shortname1 < 'Z') {
|
|
next_shortname1++;
|
|
} else {
|
|
next_shortname1='A';
|
|
if (next_shortname2 < '9') {
|
|
next_shortname2++;
|
|
} else {
|
|
next_shortname2='0';
|
|
}
|
|
}
|
|
new_shortname = 1;
|
|
}
|
|
|
|
for (cpu = 0; cpu <= max_cpu; cpu++) {
|
|
if (cpu != this_cpu)
|
|
printf(" ");
|
|
else
|
|
printf("*");
|
|
|
|
if (curr_thread[cpu]) {
|
|
if (curr_thread[cpu]->pid)
|
|
printf("%2s ", curr_thread[cpu]->shortname);
|
|
else
|
|
printf(". ");
|
|
} else
|
|
printf(" ");
|
|
}
|
|
|
|
printf(" %12.6f secs ", (double)timestamp/1e9);
|
|
if (new_shortname) {
|
|
printf("%s => %s:%d\n",
|
|
sched_in->shortname, sched_in->comm, sched_in->pid);
|
|
} else {
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
process_sched_switch_event(void *data, struct perf_session *session,
|
|
struct event *event,
|
|
int this_cpu,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
struct trace_switch_event switch_event;
|
|
|
|
FILL_COMMON_FIELDS(switch_event, event, data);
|
|
|
|
FILL_ARRAY(switch_event, prev_comm, event, data);
|
|
FILL_FIELD(switch_event, prev_pid, event, data);
|
|
FILL_FIELD(switch_event, prev_prio, event, data);
|
|
FILL_FIELD(switch_event, prev_state, event, data);
|
|
FILL_ARRAY(switch_event, next_comm, event, data);
|
|
FILL_FIELD(switch_event, next_pid, event, data);
|
|
FILL_FIELD(switch_event, next_prio, event, data);
|
|
|
|
if (curr_pid[this_cpu] != (u32)-1) {
|
|
/*
|
|
* Are we trying to switch away a PID that is
|
|
* not current?
|
|
*/
|
|
if (curr_pid[this_cpu] != switch_event.prev_pid)
|
|
nr_context_switch_bugs++;
|
|
}
|
|
if (trace_handler->switch_event)
|
|
trace_handler->switch_event(&switch_event, session, event,
|
|
this_cpu, timestamp, thread);
|
|
|
|
curr_pid[this_cpu] = switch_event.next_pid;
|
|
}
|
|
|
|
static void
|
|
process_sched_runtime_event(void *data, struct perf_session *session,
|
|
struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
struct trace_runtime_event runtime_event;
|
|
|
|
FILL_ARRAY(runtime_event, comm, event, data);
|
|
FILL_FIELD(runtime_event, pid, event, data);
|
|
FILL_FIELD(runtime_event, runtime, event, data);
|
|
FILL_FIELD(runtime_event, vruntime, event, data);
|
|
|
|
if (trace_handler->runtime_event)
|
|
trace_handler->runtime_event(&runtime_event, session, event, cpu, timestamp, thread);
|
|
}
|
|
|
|
static void
|
|
process_sched_fork_event(void *data,
|
|
struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
struct trace_fork_event fork_event;
|
|
|
|
FILL_COMMON_FIELDS(fork_event, event, data);
|
|
|
|
FILL_ARRAY(fork_event, parent_comm, event, data);
|
|
FILL_FIELD(fork_event, parent_pid, event, data);
|
|
FILL_ARRAY(fork_event, child_comm, event, data);
|
|
FILL_FIELD(fork_event, child_pid, event, data);
|
|
|
|
if (trace_handler->fork_event)
|
|
trace_handler->fork_event(&fork_event, event,
|
|
cpu, timestamp, thread);
|
|
}
|
|
|
|
static void
|
|
process_sched_exit_event(struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
if (verbose)
|
|
printf("sched_exit event %p\n", event);
|
|
}
|
|
|
|
static void
|
|
process_sched_migrate_task_event(void *data, struct perf_session *session,
|
|
struct event *event,
|
|
int cpu __used,
|
|
u64 timestamp __used,
|
|
struct thread *thread __used)
|
|
{
|
|
struct trace_migrate_task_event migrate_task_event;
|
|
|
|
FILL_COMMON_FIELDS(migrate_task_event, event, data);
|
|
|
|
FILL_ARRAY(migrate_task_event, comm, event, data);
|
|
FILL_FIELD(migrate_task_event, pid, event, data);
|
|
FILL_FIELD(migrate_task_event, prio, event, data);
|
|
FILL_FIELD(migrate_task_event, cpu, event, data);
|
|
|
|
if (trace_handler->migrate_task_event)
|
|
trace_handler->migrate_task_event(&migrate_task_event, session,
|
|
event, cpu, timestamp, thread);
|
|
}
|
|
|
|
static void
|
|
process_raw_event(event_t *raw_event __used, struct perf_session *session,
|
|
void *data, int cpu, u64 timestamp, struct thread *thread)
|
|
{
|
|
struct event *event;
|
|
int type;
|
|
|
|
|
|
type = trace_parse_common_type(data);
|
|
event = trace_find_event(type);
|
|
|
|
if (!strcmp(event->name, "sched_switch"))
|
|
process_sched_switch_event(data, session, event, cpu, timestamp, thread);
|
|
if (!strcmp(event->name, "sched_stat_runtime"))
|
|
process_sched_runtime_event(data, session, event, cpu, timestamp, thread);
|
|
if (!strcmp(event->name, "sched_wakeup"))
|
|
process_sched_wakeup_event(data, session, event, cpu, timestamp, thread);
|
|
if (!strcmp(event->name, "sched_wakeup_new"))
|
|
process_sched_wakeup_event(data, session, event, cpu, timestamp, thread);
|
|
if (!strcmp(event->name, "sched_process_fork"))
|
|
process_sched_fork_event(data, event, cpu, timestamp, thread);
|
|
if (!strcmp(event->name, "sched_process_exit"))
|
|
process_sched_exit_event(event, cpu, timestamp, thread);
|
|
if (!strcmp(event->name, "sched_migrate_task"))
|
|
process_sched_migrate_task_event(data, session, event, cpu, timestamp, thread);
|
|
}
|
|
|
|
static int process_sample_event(event_t *event, struct sample_data *sample,
|
|
struct perf_session *session)
|
|
{
|
|
struct thread *thread;
|
|
|
|
if (!(session->sample_type & PERF_SAMPLE_RAW))
|
|
return 0;
|
|
|
|
thread = perf_session__findnew(session, sample->pid);
|
|
if (thread == NULL) {
|
|
pr_debug("problem processing %d event, skipping it.\n",
|
|
event->header.type);
|
|
return -1;
|
|
}
|
|
|
|
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
|
|
|
|
if (profile_cpu != -1 && profile_cpu != (int)sample->cpu)
|
|
return 0;
|
|
|
|
process_raw_event(event, session, sample->raw_data, sample->cpu,
|
|
sample->time, thread);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct perf_event_ops event_ops = {
|
|
.sample = process_sample_event,
|
|
.comm = event__process_comm,
|
|
.lost = event__process_lost,
|
|
.fork = event__process_task,
|
|
.ordered_samples = true,
|
|
};
|
|
|
|
static int read_events(void)
|
|
{
|
|
int err = -EINVAL;
|
|
struct perf_session *session = perf_session__new(input_name, O_RDONLY,
|
|
0, false, &event_ops);
|
|
if (session == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (perf_session__has_traces(session, "record -R")) {
|
|
err = perf_session__process_events(session, &event_ops);
|
|
nr_events = session->hists.stats.nr_events[0];
|
|
nr_lost_events = session->hists.stats.total_lost;
|
|
nr_lost_chunks = session->hists.stats.nr_events[PERF_RECORD_LOST];
|
|
}
|
|
|
|
perf_session__delete(session);
|
|
return err;
|
|
}
|
|
|
|
static void print_bad_events(void)
|
|
{
|
|
if (nr_unordered_timestamps && nr_timestamps) {
|
|
printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
|
|
(double)nr_unordered_timestamps/(double)nr_timestamps*100.0,
|
|
nr_unordered_timestamps, nr_timestamps);
|
|
}
|
|
if (nr_lost_events && nr_events) {
|
|
printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
|
|
(double)nr_lost_events/(double)nr_events*100.0,
|
|
nr_lost_events, nr_events, nr_lost_chunks);
|
|
}
|
|
if (nr_state_machine_bugs && nr_timestamps) {
|
|
printf(" INFO: %.3f%% state machine bugs (%ld out of %ld)",
|
|
(double)nr_state_machine_bugs/(double)nr_timestamps*100.0,
|
|
nr_state_machine_bugs, nr_timestamps);
|
|
if (nr_lost_events)
|
|
printf(" (due to lost events?)");
|
|
printf("\n");
|
|
}
|
|
if (nr_context_switch_bugs && nr_timestamps) {
|
|
printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
|
|
(double)nr_context_switch_bugs/(double)nr_timestamps*100.0,
|
|
nr_context_switch_bugs, nr_timestamps);
|
|
if (nr_lost_events)
|
|
printf(" (due to lost events?)");
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
static void __cmd_lat(void)
|
|
{
|
|
struct rb_node *next;
|
|
|
|
setup_pager();
|
|
read_events();
|
|
sort_lat();
|
|
|
|
printf("\n ---------------------------------------------------------------------------------------------------------------\n");
|
|
printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Maximum delay at |\n");
|
|
printf(" ---------------------------------------------------------------------------------------------------------------\n");
|
|
|
|
next = rb_first(&sorted_atom_root);
|
|
|
|
while (next) {
|
|
struct work_atoms *work_list;
|
|
|
|
work_list = rb_entry(next, struct work_atoms, node);
|
|
output_lat_thread(work_list);
|
|
next = rb_next(next);
|
|
}
|
|
|
|
printf(" -----------------------------------------------------------------------------------------\n");
|
|
printf(" TOTAL: |%11.3f ms |%9Ld |\n",
|
|
(double)all_runtime/1e6, all_count);
|
|
|
|
printf(" ---------------------------------------------------\n");
|
|
|
|
print_bad_events();
|
|
printf("\n");
|
|
|
|
}
|
|
|
|
static struct trace_sched_handler map_ops = {
|
|
.wakeup_event = NULL,
|
|
.switch_event = map_switch_event,
|
|
.runtime_event = NULL,
|
|
.fork_event = NULL,
|
|
};
|
|
|
|
static void __cmd_map(void)
|
|
{
|
|
max_cpu = sysconf(_SC_NPROCESSORS_CONF);
|
|
|
|
setup_pager();
|
|
read_events();
|
|
print_bad_events();
|
|
}
|
|
|
|
static void __cmd_replay(void)
|
|
{
|
|
unsigned long i;
|
|
|
|
calibrate_run_measurement_overhead();
|
|
calibrate_sleep_measurement_overhead();
|
|
|
|
test_calibrations();
|
|
|
|
read_events();
|
|
|
|
printf("nr_run_events: %ld\n", nr_run_events);
|
|
printf("nr_sleep_events: %ld\n", nr_sleep_events);
|
|
printf("nr_wakeup_events: %ld\n", nr_wakeup_events);
|
|
|
|
if (targetless_wakeups)
|
|
printf("target-less wakeups: %ld\n", targetless_wakeups);
|
|
if (multitarget_wakeups)
|
|
printf("multi-target wakeups: %ld\n", multitarget_wakeups);
|
|
if (nr_run_events_optimized)
|
|
printf("run atoms optimized: %ld\n",
|
|
nr_run_events_optimized);
|
|
|
|
print_task_traces();
|
|
add_cross_task_wakeups();
|
|
|
|
create_tasks();
|
|
printf("------------------------------------------------------------\n");
|
|
for (i = 0; i < replay_repeat; i++)
|
|
run_one_test();
|
|
}
|
|
|
|
|
|
static const char * const sched_usage[] = {
|
|
"perf sched [<options>] {record|latency|map|replay|trace}",
|
|
NULL
|
|
};
|
|
|
|
static 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()
|
|
};
|
|
|
|
static const char * const latency_usage[] = {
|
|
"perf sched latency [<options>]",
|
|
NULL
|
|
};
|
|
|
|
static const struct option latency_options[] = {
|
|
OPT_STRING('s', "sort", &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", &profile_cpu,
|
|
"CPU to profile on"),
|
|
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
|
|
"dump raw trace in ASCII"),
|
|
OPT_END()
|
|
};
|
|
|
|
static const char * const replay_usage[] = {
|
|
"perf sched replay [<options>]",
|
|
NULL
|
|
};
|
|
|
|
static const struct option replay_options[] = {
|
|
OPT_UINTEGER('r', "repeat", &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_END()
|
|
};
|
|
|
|
static void setup_sorting(void)
|
|
{
|
|
char *tmp, *tok, *str = strdup(sort_order);
|
|
|
|
for (tok = strtok_r(str, ", ", &tmp);
|
|
tok; tok = strtok_r(NULL, ", ", &tmp)) {
|
|
if (sort_dimension__add(tok, &sort_list) < 0) {
|
|
error("Unknown --sort key: `%s'", tok);
|
|
usage_with_options(latency_usage, latency_options);
|
|
}
|
|
}
|
|
|
|
free(str);
|
|
|
|
sort_dimension__add("pid", &cmp_pid);
|
|
}
|
|
|
|
static const char *record_args[] = {
|
|
"record",
|
|
"-a",
|
|
"-R",
|
|
"-f",
|
|
"-m", "1024",
|
|
"-c", "1",
|
|
"-e", "sched:sched_switch:r",
|
|
"-e", "sched:sched_stat_wait:r",
|
|
"-e", "sched:sched_stat_sleep:r",
|
|
"-e", "sched:sched_stat_iowait:r",
|
|
"-e", "sched:sched_stat_runtime:r",
|
|
"-e", "sched:sched_process_exit:r",
|
|
"-e", "sched:sched_process_fork:r",
|
|
"-e", "sched:sched_wakeup:r",
|
|
"-e", "sched:sched_migrate_task:r",
|
|
};
|
|
|
|
static int __cmd_record(int argc, const char **argv)
|
|
{
|
|
unsigned int rec_argc, i, j;
|
|
const char **rec_argv;
|
|
|
|
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
|
|
rec_argv = calloc(rec_argc + 1, sizeof(char *));
|
|
|
|
if (rec_argv)
|
|
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 __used)
|
|
{
|
|
argc = parse_options(argc, argv, sched_options, 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);
|
|
|
|
symbol__init();
|
|
if (!strncmp(argv[0], "rec", 3)) {
|
|
return __cmd_record(argc, argv);
|
|
} else if (!strncmp(argv[0], "lat", 3)) {
|
|
trace_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();
|
|
__cmd_lat();
|
|
} else if (!strcmp(argv[0], "map")) {
|
|
trace_handler = &map_ops;
|
|
setup_sorting();
|
|
__cmd_map();
|
|
} else if (!strncmp(argv[0], "rep", 3)) {
|
|
trace_handler = &replay_ops;
|
|
if (argc) {
|
|
argc = parse_options(argc, argv, replay_options, replay_usage, 0);
|
|
if (argc)
|
|
usage_with_options(replay_usage, replay_options);
|
|
}
|
|
__cmd_replay();
|
|
} else {
|
|
usage_with_options(sched_usage, sched_options);
|
|
}
|
|
|
|
return 0;
|
|
}
|