perf sched: Add 'perf sched map' scheduling event map printout
This prints a textual context-switching outline of workload
captured via perf sched record.
For example, on a 16 CPU box it outputs:
N1 O1 . . . S1 . . . B0 . *I0 C1 . M1 . 23002.773423 secs
N1 O1 . *Q0 . S1 . . . B0 . I0 C1 . M1 . 23002.773423 secs
N1 O1 . Q0 . S1 . . . B0 . *R1 C1 . M1 . 23002.773485 secs
N1 O1 . Q0 . S1 . *S0 . B0 . R1 C1 . M1 . 23002.773478 secs
*L0 O1 . Q0 . S1 . S0 . B0 . R1 C1 . M1 . 23002.773523 secs
L0 O1 . *. . S1 . S0 . B0 . R1 C1 . M1 . 23002.773531 secs
L0 O1 . . . S1 . S0 . B0 . R1 C1 *T1 M1 . 23002.773547 secs T1 => irqbalance:2089
L0 O1 . . . S1 . S0 . *P0 . R1 C1 T1 M1 . 23002.773549 secs
*N1 O1 . . . S1 . S0 . P0 . R1 C1 T1 M1 . 23002.773566 secs
N1 O1 . . . *J0 . S0 . P0 . R1 C1 T1 M1 . 23002.773571 secs
N1 O1 . . . J0 . S0 *B0 P0 . R1 C1 T1 M1 . 23002.773592 secs
N1 O1 . . . J0 . *U0 B0 P0 . R1 C1 T1 M1 . 23002.773582 secs
N1 O1 . . . *S1 . U0 B0 P0 . R1 C1 T1 M1 . 23002.773604 secs
N1 O1 . . . S1 . U0 B0 *. . R1 C1 T1 M1 . 23002.773615 secs
N1 O1 . . . S1 . U0 B0 . . *K0 C1 T1 M1 . 23002.773631 secs
N1 O1 . *M0 . S1 . U0 B0 . . K0 C1 T1 M1 . 23002.773624 secs
N1 O1 . M0 . S1 . U0 *. . . K0 C1 T1 M1 . 23002.773644 secs
N1 O1 . M0 . S1 . U0 . . . *R1 C1 T1 M1 . 23002.773662 secs
N1 O1 . M0 . S1 . *. . . . R1 C1 T1 M1 . 23002.773648 secs
N1 O1 . *. . S1 . . . . . R1 C1 T1 M1 . 23002.773680 secs
N1 O1 . . . *L0 . . . . . R1 C1 T1 M1 . 23002.773717 secs
*N0 O1 . . . L0 . . . . . R1 C1 T1 M1 . 23002.773709 secs
*N1 O1 . . . L0 . . . . . R1 C1 T1 M1 . 23002.773747 secs
Columns stand for individual CPUs, from CPU0 to CPU15, and the
two-letter shortcuts stand for tasks that are running on a CPU.
'*' denotes the CPU that had the event.
A dot signals an idle CPU.
New tasks are assigned new two-letter shortcuts - when they occur
first they are printed. In the above example 'T1' stood for irqbalance:
T1 => irqbalance:2089
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
parent
80ed0987f3
commit
0ec04e16d0
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@ -159,8 +159,6 @@ 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 int read_events(void);
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static u64 get_nsecs(void)
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{
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@ -634,38 +632,6 @@ static void test_calibrations(void)
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printf("the sleep test took %Ld nsecs\n", T1-T0);
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}
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static void __cmd_replay(void)
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{
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unsigned long i;
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calibrate_run_measurement_overhead();
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calibrate_sleep_measurement_overhead();
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test_calibrations();
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read_events();
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printf("nr_run_events: %ld\n", nr_run_events);
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printf("nr_sleep_events: %ld\n", nr_sleep_events);
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printf("nr_wakeup_events: %ld\n", nr_wakeup_events);
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if (targetless_wakeups)
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printf("target-less wakeups: %ld\n", targetless_wakeups);
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if (multitarget_wakeups)
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printf("multi-target wakeups: %ld\n", multitarget_wakeups);
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if (nr_run_events_optimized)
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printf("run atoms optimized: %ld\n",
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nr_run_events_optimized);
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print_task_traces();
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add_cross_task_wakeups();
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create_tasks();
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printf("------------------------------------------------------------\n");
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for (i = 0; i < replay_repeat; i++)
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run_one_test();
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}
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static int
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process_comm_event(event_t *event, unsigned long offset, unsigned long head)
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{
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@ -1354,64 +1320,6 @@ static void sort_lat(void)
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}
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}
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static void __cmd_lat(void)
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{
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struct rb_node *next;
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setup_pager();
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read_events();
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sort_lat();
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printf("\n -----------------------------------------------------------------------------------------\n");
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printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms |\n");
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printf(" -----------------------------------------------------------------------------------------\n");
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next = rb_first(&sorted_atom_root);
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while (next) {
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struct work_atoms *work_list;
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work_list = rb_entry(next, struct work_atoms, node);
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output_lat_thread(work_list);
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next = rb_next(next);
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}
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printf(" -----------------------------------------------------------------------------------------\n");
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printf(" TOTAL: |%11.3f ms |%9Ld |\n",
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(double)all_runtime/1e6, all_count);
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printf(" ---------------------------------------------------\n");
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if (nr_unordered_timestamps && nr_timestamps) {
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printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
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(double)nr_unordered_timestamps/(double)nr_timestamps*100.0,
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nr_unordered_timestamps, nr_timestamps);
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} else {
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}
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if (nr_lost_events && nr_events) {
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printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
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(double)nr_lost_events/(double)nr_events*100.0,
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nr_lost_events, nr_events, nr_lost_chunks);
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}
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if (nr_state_machine_bugs && nr_timestamps) {
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printf(" INFO: %.3f%% state machine bugs (%ld out of %ld)",
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(double)nr_state_machine_bugs/(double)nr_timestamps*100.0,
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nr_state_machine_bugs, nr_timestamps);
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if (nr_lost_events)
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printf(" (due to lost events?)");
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printf("\n");
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}
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if (nr_context_switch_bugs && nr_timestamps) {
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printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
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(double)nr_context_switch_bugs/(double)nr_timestamps*100.0,
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nr_context_switch_bugs, nr_timestamps);
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if (nr_lost_events)
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printf(" (due to lost events?)");
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printf("\n");
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}
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printf("\n");
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}
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static struct trace_sched_handler *trace_handler;
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static void
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@ -1431,19 +1339,106 @@ process_sched_wakeup_event(struct raw_event_sample *raw,
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FILL_FIELD(wakeup_event, success, event, raw->data);
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FILL_FIELD(wakeup_event, cpu, event, raw->data);
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trace_handler->wakeup_event(&wakeup_event, event, cpu, timestamp, thread);
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if (trace_handler->wakeup_event)
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trace_handler->wakeup_event(&wakeup_event, event, cpu, timestamp, thread);
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}
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/*
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* Track the current task - that way we can know whether there's any
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* weird events, such as a task being switched away that is not current.
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*/
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static int max_cpu = 15;
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static u32 curr_pid[MAX_CPUS] = { [0 ... MAX_CPUS-1] = -1 };
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static struct thread *curr_thread[MAX_CPUS];
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static char next_shortname1 = 'A';
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static char next_shortname2 = '0';
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static void
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map_switch_event(struct trace_switch_event *switch_event,
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struct event *event __used,
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int this_cpu,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct thread *sched_out, *sched_in;
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int new_shortname;
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u64 timestamp0;
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s64 delta;
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int cpu;
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BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
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if (this_cpu > max_cpu)
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max_cpu = this_cpu;
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timestamp0 = cpu_last_switched[this_cpu];
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cpu_last_switched[this_cpu] = timestamp;
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if (timestamp0)
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delta = timestamp - timestamp0;
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else
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delta = 0;
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if (delta < 0)
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die("hm, delta: %Ld < 0 ?\n", delta);
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sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);
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sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);
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curr_thread[this_cpu] = sched_in;
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printf(" ");
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new_shortname = 0;
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if (!sched_in->shortname[0]) {
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sched_in->shortname[0] = next_shortname1;
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sched_in->shortname[1] = next_shortname2;
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if (next_shortname1 < 'Z') {
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next_shortname1++;
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} else {
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next_shortname1='A';
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if (next_shortname2 < '9') {
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next_shortname2++;
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} else {
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next_shortname2='0';
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}
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}
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new_shortname = 1;
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}
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for (cpu = 0; cpu <= max_cpu; cpu++) {
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if (cpu != this_cpu)
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printf(" ");
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else
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printf("*");
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if (curr_thread[cpu]) {
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if (curr_thread[cpu]->pid)
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printf("%2s ", curr_thread[cpu]->shortname);
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else
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printf(". ");
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} else
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printf(" ");
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}
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printf(" %12.6f secs ", (double)timestamp/1e9);
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if (new_shortname) {
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printf("%s => %s:%d\n",
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sched_in->shortname, sched_in->comm, sched_in->pid);
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} else {
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printf("\n");
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}
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}
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static void
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process_sched_switch_event(struct raw_event_sample *raw,
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struct event *event,
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int cpu,
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int this_cpu,
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u64 timestamp __used,
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struct thread *thread __used)
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{
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@ -1459,17 +1454,18 @@ process_sched_switch_event(struct raw_event_sample *raw,
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FILL_FIELD(switch_event, next_pid, event, raw->data);
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FILL_FIELD(switch_event, next_prio, event, raw->data);
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if (curr_pid[cpu] != (u32)-1) {
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if (curr_pid[this_cpu] != (u32)-1) {
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/*
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* Are we trying to switch away a PID that is
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* not current?
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*/
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if (curr_pid[cpu] != switch_event.prev_pid)
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if (curr_pid[this_cpu] != switch_event.prev_pid)
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nr_context_switch_bugs++;
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}
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curr_pid[cpu] = switch_event.next_pid;
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if (trace_handler->switch_event)
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trace_handler->switch_event(&switch_event, event, this_cpu, timestamp, thread);
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trace_handler->switch_event(&switch_event, event, cpu, timestamp, thread);
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curr_pid[this_cpu] = switch_event.next_pid;
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}
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static void
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@ -1486,7 +1482,8 @@ process_sched_runtime_event(struct raw_event_sample *raw,
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FILL_FIELD(runtime_event, runtime, event, raw->data);
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FILL_FIELD(runtime_event, vruntime, event, raw->data);
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trace_handler->runtime_event(&runtime_event, event, cpu, timestamp, thread);
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if (trace_handler->runtime_event)
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trace_handler->runtime_event(&runtime_event, event, cpu, timestamp, thread);
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}
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static void
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@ -1505,7 +1502,8 @@ process_sched_fork_event(struct raw_event_sample *raw,
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FILL_ARRAY(fork_event, child_comm, event, raw->data);
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FILL_FIELD(fork_event, child_pid, event, raw->data);
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trace_handler->fork_event(&fork_event, event, cpu, timestamp, thread);
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if (trace_handler->fork_event)
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trace_handler->fork_event(&fork_event, event, cpu, timestamp, thread);
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}
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static void
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@ -1748,6 +1746,116 @@ more:
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return rc;
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}
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static void print_bad_events(void)
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{
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if (nr_unordered_timestamps && nr_timestamps) {
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printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
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(double)nr_unordered_timestamps/(double)nr_timestamps*100.0,
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nr_unordered_timestamps, nr_timestamps);
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}
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if (nr_lost_events && nr_events) {
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printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
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(double)nr_lost_events/(double)nr_events*100.0,
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nr_lost_events, nr_events, nr_lost_chunks);
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}
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if (nr_state_machine_bugs && nr_timestamps) {
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printf(" INFO: %.3f%% state machine bugs (%ld out of %ld)",
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(double)nr_state_machine_bugs/(double)nr_timestamps*100.0,
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nr_state_machine_bugs, nr_timestamps);
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if (nr_lost_events)
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printf(" (due to lost events?)");
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printf("\n");
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}
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if (nr_context_switch_bugs && nr_timestamps) {
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printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
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(double)nr_context_switch_bugs/(double)nr_timestamps*100.0,
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nr_context_switch_bugs, nr_timestamps);
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if (nr_lost_events)
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printf(" (due to lost events?)");
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printf("\n");
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}
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}
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static void __cmd_lat(void)
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{
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struct rb_node *next;
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setup_pager();
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read_events();
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sort_lat();
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printf("\n -----------------------------------------------------------------------------------------\n");
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printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms |\n");
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printf(" -----------------------------------------------------------------------------------------\n");
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next = rb_first(&sorted_atom_root);
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while (next) {
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struct work_atoms *work_list;
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work_list = rb_entry(next, struct work_atoms, node);
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output_lat_thread(work_list);
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next = rb_next(next);
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}
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printf(" -----------------------------------------------------------------------------------------\n");
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printf(" TOTAL: |%11.3f ms |%9Ld |\n",
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(double)all_runtime/1e6, all_count);
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printf(" ---------------------------------------------------\n");
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print_bad_events();
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printf("\n");
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}
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static struct trace_sched_handler map_ops = {
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.wakeup_event = NULL,
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.switch_event = map_switch_event,
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.runtime_event = NULL,
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.fork_event = NULL,
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};
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static void __cmd_map(void)
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{
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setup_pager();
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read_events();
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print_bad_events();
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}
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static void __cmd_replay(void)
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{
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unsigned long i;
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calibrate_run_measurement_overhead();
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calibrate_sleep_measurement_overhead();
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test_calibrations();
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read_events();
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printf("nr_run_events: %ld\n", nr_run_events);
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printf("nr_sleep_events: %ld\n", nr_sleep_events);
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printf("nr_wakeup_events: %ld\n", nr_wakeup_events);
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if (targetless_wakeups)
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printf("target-less wakeups: %ld\n", targetless_wakeups);
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if (multitarget_wakeups)
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printf("multi-target wakeups: %ld\n", multitarget_wakeups);
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if (nr_run_events_optimized)
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printf("run atoms optimized: %ld\n",
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nr_run_events_optimized);
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print_task_traces();
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add_cross_task_wakeups();
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create_tasks();
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printf("------------------------------------------------------------\n");
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for (i = 0; i < replay_repeat; i++)
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run_one_test();
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}
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static const char * const sched_usage[] = {
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"perf sched [<options>] {record|latency|replay|trace}",
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NULL
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@ -1867,6 +1975,10 @@ int cmd_sched(int argc, const char **argv, const char *prefix __used)
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}
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setup_sorting();
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__cmd_lat();
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} else if (!strcmp(argv[0], "map")) {
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trace_handler = &map_ops;
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setup_sorting();
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__cmd_map();
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} else if (!strncmp(argv[0], "rep", 3)) {
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trace_handler = &replay_ops;
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if (argc) {
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@ -8,7 +8,7 @@
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static struct thread *thread__new(pid_t pid)
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{
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struct thread *self = malloc(sizeof(*self));
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struct thread *self = calloc(1, sizeof(*self));
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if (self != NULL) {
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self->pid = pid;
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@ -7,6 +7,7 @@ struct thread {
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struct rb_node rb_node;
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struct list_head maps;
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pid_t pid;
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char shortname[3];
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char *comm;
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};
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