perf sched timehist: Show callchains for idle stat
When --idle-hist option is used with --summary, it now shows idle stats
with callchains like below:
Idle stats by callchain:
CPU 0: 902.195 msec
Idle time (msec) Count Callchains
---------------- ------- --------------------------------------------------
370.589 69 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- entry_SYSCALL_64_fastpath
178.799 17 worker_thread <- kthread <- ret_from_fork
128.352 17 schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork
125.111 19 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_select <- core_sys_select
71.599 50 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
23.146 1 rcu_gp_kthread <- kthread <- ret_from_fork
4.510 1 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- do_syscall_64
0.085 1 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- do_restart_poll
...
Committer notes:
Extra testing:
# uname -a
Linux jouet 4.8.8-300.fc25.x86_64 #1 SMP Tue Nov 15 18:10:06 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
1) Run 'perf sched record -g'
2) Run 'perf sched timehist --idle --summary'
<SNIP>
Idle stats by callchain:
CPU 0: 13456.840 msec
Idle time (msec) Count Callchains
---------------- ----- --------------------------------------------------
5386.637 3283 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
2750.238 2299 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- do_syscall_64
1275.672 1287 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- entry_SYSCALL_64_fastpath
936.322 452 worker_thread <- kthread <- ret_from_fork
741.311 385 rcu_nocb_kthread <- kthread <- ret_from_fork
729.385 248 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_ppoll
365.386 229 irq_thread <- kthread <- ret_from_fork
338.934 265 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- entry_SYSCALL_64_fastpath
219.488 201 schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork
186.839 410 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- do_syscall_64
142.541 59 kvm_vcpu_block <- kvm_arch_vcpu_ioctl_run <- kvm_vcpu_ioctl <- do_vfs_ioctl <- sys_ioctl
83.887 92 smpboot_thread_fn <- kthread <- ret_from_fork
62.722 96 do_exit <- do_group_exit <- 0x2a5594 <- entry_SYSCALL_64_fastpath
47.894 83 pipe_wait <- pipe_read <- __vfs_read <- vfs_read <- sys_read
46.554 61 rcu_gp_kthread <- kthread <- ret_from_fork
34.337 21 schedule_timeout <- intel_fbc_work_fn <- process_one_work <- worker_thread <- kthread
29.521 14 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_select <- core_sys_select
20.274 10 schedule_timeout <- io_schedule_timeout <- bit_wait_io <- __wait_on_bit <- out_of_line_wait_on_bit
15.085 55 schedule_timeout <- unix_stream_read_generic <- unix_stream_recvmsg <- sock_recvmsg <- SYSC_recvfrom
<SNIP>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161208144755.16673-7-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
Родитель
07235f84ec
Коммит
ba957ebb54
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@ -2448,6 +2448,9 @@ static int timehist_sched_change_event(struct perf_tool *tool,
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last_tr->dt_wait = 0;
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last_tr->dt_delay = 0;
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if (itr->cursor.nr)
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callchain_append(&itr->callchain, &itr->cursor, t - tprev);
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itr->last_thread = NULL;
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}
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}
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@ -2557,6 +2560,60 @@ static int show_deadthread_runtime(struct thread *t, void *priv)
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return __show_thread_runtime(t, priv);
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}
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static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
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{
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const char *sep = " <- ";
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struct callchain_list *chain;
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size_t ret = 0;
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char bf[1024];
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bool first;
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if (node == NULL)
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return 0;
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ret = callchain__fprintf_folded(fp, node->parent);
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first = (ret == 0);
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list_for_each_entry(chain, &node->val, list) {
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if (chain->ip >= PERF_CONTEXT_MAX)
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continue;
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if (chain->ms.sym && chain->ms.sym->ignore)
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continue;
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ret += fprintf(fp, "%s%s", first ? "" : sep,
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callchain_list__sym_name(chain, bf, sizeof(bf),
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false));
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first = false;
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}
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return ret;
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}
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static size_t timehist_print_idlehist_callchain(struct rb_root *root)
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{
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size_t ret = 0;
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FILE *fp = stdout;
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struct callchain_node *chain;
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struct rb_node *rb_node = rb_first(root);
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printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains");
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printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line,
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graph_dotted_line);
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while (rb_node) {
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chain = rb_entry(rb_node, struct callchain_node, rb_node);
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rb_node = rb_next(rb_node);
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ret += fprintf(fp, " ");
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print_sched_time(chain->hit, 12);
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ret += 16; /* print_sched_time returns 2nd arg + 4 */
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ret += fprintf(fp, " %8d ", chain->count);
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ret += callchain__fprintf_folded(fp, chain);
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ret += fprintf(fp, "\n");
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}
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return ret;
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}
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static void timehist_print_summary(struct perf_sched *sched,
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struct perf_session *session)
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{
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@ -2615,6 +2672,35 @@ static void timehist_print_summary(struct perf_sched *sched,
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printf(" CPU %2d idle entire time window\n", i);
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}
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if (sched->idle_hist && symbol_conf.use_callchain) {
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callchain_param.mode = CHAIN_FOLDED;
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callchain_param.value = CCVAL_PERIOD;
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callchain_register_param(&callchain_param);
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printf("\nIdle stats by callchain:\n");
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for (i = 0; i < idle_max_cpu; ++i) {
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struct idle_thread_runtime *itr;
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t = idle_threads[i];
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if (!t)
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continue;
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itr = thread__priv(t);
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if (itr == NULL)
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continue;
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callchain_param.sort(&itr->sorted_root, &itr->callchain,
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0, &callchain_param);
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printf(" CPU %2d:", i);
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print_sched_time(itr->tr.total_run_time, 6);
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printf(" msec\n");
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timehist_print_idlehist_callchain(&itr->sorted_root);
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printf("\n");
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}
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}
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printf("\n"
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" Total number of unique tasks: %" PRIu64 "\n"
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"Total number of context switches: %" PRIu64 "\n"
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