1248 lines
32 KiB
C
1248 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
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*/
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#define _GNU_SOURCE
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#include <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <time.h>
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#include <errno.h>
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#include <sched.h>
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#include <pthread.h>
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#include "timerlat.h"
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#include "timerlat_aa.h"
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#include "timerlat_u.h"
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#include "timerlat_bpf.h"
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struct timerlat_top_cpu {
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unsigned long long irq_count;
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unsigned long long thread_count;
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unsigned long long user_count;
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unsigned long long cur_irq;
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unsigned long long min_irq;
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unsigned long long sum_irq;
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unsigned long long max_irq;
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unsigned long long cur_thread;
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unsigned long long min_thread;
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unsigned long long sum_thread;
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unsigned long long max_thread;
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unsigned long long cur_user;
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unsigned long long min_user;
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unsigned long long sum_user;
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unsigned long long max_user;
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};
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struct timerlat_top_data {
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struct timerlat_top_cpu *cpu_data;
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int nr_cpus;
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};
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/*
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* timerlat_free_top - free runtime data
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*/
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static void
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timerlat_free_top(struct timerlat_top_data *data)
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{
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free(data->cpu_data);
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free(data);
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}
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/*
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* timerlat_alloc_histogram - alloc runtime data
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*/
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static struct timerlat_top_data *timerlat_alloc_top(int nr_cpus)
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{
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struct timerlat_top_data *data;
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int cpu;
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data = calloc(1, sizeof(*data));
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if (!data)
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return NULL;
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data->nr_cpus = nr_cpus;
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/* one set of histograms per CPU */
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data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus);
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if (!data->cpu_data)
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goto cleanup;
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/* set the min to max */
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for (cpu = 0; cpu < nr_cpus; cpu++) {
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data->cpu_data[cpu].min_irq = ~0;
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data->cpu_data[cpu].min_thread = ~0;
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data->cpu_data[cpu].min_user = ~0;
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}
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return data;
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cleanup:
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timerlat_free_top(data);
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return NULL;
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}
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static void
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timerlat_top_reset_sum(struct timerlat_top_cpu *summary)
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{
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memset(summary, 0, sizeof(*summary));
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summary->min_irq = ~0;
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summary->min_thread = ~0;
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summary->min_user = ~0;
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}
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static void
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timerlat_top_update_sum(struct osnoise_tool *tool, int cpu, struct timerlat_top_cpu *sum)
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{
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struct timerlat_top_data *data = tool->data;
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struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
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sum->irq_count += cpu_data->irq_count;
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update_min(&sum->min_irq, &cpu_data->min_irq);
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update_sum(&sum->sum_irq, &cpu_data->sum_irq);
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update_max(&sum->max_irq, &cpu_data->max_irq);
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sum->thread_count += cpu_data->thread_count;
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update_min(&sum->min_thread, &cpu_data->min_thread);
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update_sum(&sum->sum_thread, &cpu_data->sum_thread);
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update_max(&sum->max_thread, &cpu_data->max_thread);
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sum->user_count += cpu_data->user_count;
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update_min(&sum->min_user, &cpu_data->min_user);
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update_sum(&sum->sum_user, &cpu_data->sum_user);
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update_max(&sum->max_user, &cpu_data->max_user);
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}
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/*
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* timerlat_hist_update - record a new timerlat occurent on cpu, updating data
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*/
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static void
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timerlat_top_update(struct osnoise_tool *tool, int cpu,
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unsigned long long thread,
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unsigned long long latency)
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{
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struct timerlat_params *params = tool->params;
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struct timerlat_top_data *data = tool->data;
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struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
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if (params->output_divisor)
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latency = latency / params->output_divisor;
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if (!thread) {
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cpu_data->irq_count++;
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cpu_data->cur_irq = latency;
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update_min(&cpu_data->min_irq, &latency);
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update_sum(&cpu_data->sum_irq, &latency);
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update_max(&cpu_data->max_irq, &latency);
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} else if (thread == 1) {
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cpu_data->thread_count++;
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cpu_data->cur_thread = latency;
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update_min(&cpu_data->min_thread, &latency);
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update_sum(&cpu_data->sum_thread, &latency);
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update_max(&cpu_data->max_thread, &latency);
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} else {
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cpu_data->user_count++;
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cpu_data->cur_user = latency;
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update_min(&cpu_data->min_user, &latency);
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update_sum(&cpu_data->sum_user, &latency);
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update_max(&cpu_data->max_user, &latency);
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}
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}
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/*
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* timerlat_top_handler - this is the handler for timerlat tracer events
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*/
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static int
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timerlat_top_handler(struct trace_seq *s, struct tep_record *record,
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struct tep_event *event, void *context)
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{
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struct trace_instance *trace = context;
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struct timerlat_params *params;
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unsigned long long latency, thread;
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struct osnoise_tool *top;
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int cpu = record->cpu;
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top = container_of(trace, struct osnoise_tool, trace);
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params = top->params;
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if (!params->aa_only) {
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tep_get_field_val(s, event, "context", record, &thread, 1);
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tep_get_field_val(s, event, "timer_latency", record, &latency, 1);
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timerlat_top_update(top, cpu, thread, latency);
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}
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return 0;
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}
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/*
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* timerlat_top_bpf_pull_data - copy data from BPF maps into userspace
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*/
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static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
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{
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struct timerlat_top_data *data = tool->data;
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int i, err;
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long long value_irq[data->nr_cpus],
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value_thread[data->nr_cpus],
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value_user[data->nr_cpus];
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/* Pull summary */
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err = timerlat_bpf_get_summary_value(SUMMARY_CURRENT,
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value_irq, value_thread, value_user,
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data->nr_cpus);
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if (err)
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return err;
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for (i = 0; i < data->nr_cpus; i++) {
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data->cpu_data[i].cur_irq = value_irq[i];
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data->cpu_data[i].cur_thread = value_thread[i];
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data->cpu_data[i].cur_user = value_user[i];
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}
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err = timerlat_bpf_get_summary_value(SUMMARY_COUNT,
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value_irq, value_thread, value_user,
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data->nr_cpus);
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if (err)
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return err;
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for (i = 0; i < data->nr_cpus; i++) {
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data->cpu_data[i].irq_count = value_irq[i];
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data->cpu_data[i].thread_count = value_thread[i];
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data->cpu_data[i].user_count = value_user[i];
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}
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err = timerlat_bpf_get_summary_value(SUMMARY_MIN,
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value_irq, value_thread, value_user,
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data->nr_cpus);
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if (err)
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return err;
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for (i = 0; i < data->nr_cpus; i++) {
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data->cpu_data[i].min_irq = value_irq[i];
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data->cpu_data[i].min_thread = value_thread[i];
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data->cpu_data[i].min_user = value_user[i];
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}
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err = timerlat_bpf_get_summary_value(SUMMARY_MAX,
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value_irq, value_thread, value_user,
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data->nr_cpus);
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if (err)
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return err;
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for (i = 0; i < data->nr_cpus; i++) {
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data->cpu_data[i].max_irq = value_irq[i];
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data->cpu_data[i].max_thread = value_thread[i];
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data->cpu_data[i].max_user = value_user[i];
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}
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err = timerlat_bpf_get_summary_value(SUMMARY_SUM,
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value_irq, value_thread, value_user,
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data->nr_cpus);
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if (err)
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return err;
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for (i = 0; i < data->nr_cpus; i++) {
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data->cpu_data[i].sum_irq = value_irq[i];
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data->cpu_data[i].sum_thread = value_thread[i];
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data->cpu_data[i].sum_user = value_user[i];
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}
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return 0;
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}
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/*
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* timerlat_top_header - print the header of the tool output
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*/
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static void timerlat_top_header(struct timerlat_params *params, struct osnoise_tool *top)
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{
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struct trace_seq *s = top->trace.seq;
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char duration[26];
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get_duration(top->start_time, duration, sizeof(duration));
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if (params->pretty_output)
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trace_seq_printf(s, "\033[2;37;40m");
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trace_seq_printf(s, " Timer Latency ");
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if (params->user_data)
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trace_seq_printf(s, " ");
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if (params->pretty_output)
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trace_seq_printf(s, "\033[0;0;0m");
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trace_seq_printf(s, "\n");
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trace_seq_printf(s, "%-6s | IRQ Timer Latency (%s) | Thread Timer Latency (%s)", duration,
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params->output_divisor == 1 ? "ns" : "us",
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params->output_divisor == 1 ? "ns" : "us");
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if (params->user_data) {
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trace_seq_printf(s, " | Ret user Timer Latency (%s)",
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params->output_divisor == 1 ? "ns" : "us");
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}
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trace_seq_printf(s, "\n");
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if (params->pretty_output)
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trace_seq_printf(s, "\033[2;30;47m");
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trace_seq_printf(s, "CPU COUNT | cur min avg max | cur min avg max");
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if (params->user_data)
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trace_seq_printf(s, " | cur min avg max");
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if (params->pretty_output)
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trace_seq_printf(s, "\033[0;0;0m");
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trace_seq_printf(s, "\n");
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}
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static const char *no_value = " -";
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/*
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* timerlat_top_print - prints the output of a given CPU
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*/
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static void timerlat_top_print(struct osnoise_tool *top, int cpu)
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{
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struct timerlat_params *params = top->params;
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struct timerlat_top_data *data = top->data;
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struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
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struct trace_seq *s = top->trace.seq;
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/*
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* Skip if no data is available: is this cpu offline?
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*/
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if (!cpu_data->irq_count && !cpu_data->thread_count)
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return;
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/*
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* Unless trace is being lost, IRQ counter is always the max.
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*/
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trace_seq_printf(s, "%3d #%-9llu |", cpu, cpu_data->irq_count);
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if (!cpu_data->irq_count) {
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trace_seq_printf(s, "%s %s %s %s |", no_value, no_value, no_value, no_value);
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} else {
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trace_seq_printf(s, "%9llu ", cpu_data->cur_irq);
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trace_seq_printf(s, "%9llu ", cpu_data->min_irq);
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trace_seq_printf(s, "%9llu ", cpu_data->sum_irq / cpu_data->irq_count);
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trace_seq_printf(s, "%9llu |", cpu_data->max_irq);
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}
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if (!cpu_data->thread_count) {
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trace_seq_printf(s, "%s %s %s %s", no_value, no_value, no_value, no_value);
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} else {
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trace_seq_printf(s, "%9llu ", cpu_data->cur_thread);
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trace_seq_printf(s, "%9llu ", cpu_data->min_thread);
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trace_seq_printf(s, "%9llu ",
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cpu_data->sum_thread / cpu_data->thread_count);
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trace_seq_printf(s, "%9llu", cpu_data->max_thread);
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}
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if (!params->user_data) {
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trace_seq_printf(s, "\n");
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return;
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}
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trace_seq_printf(s, " |");
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if (!cpu_data->user_count) {
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trace_seq_printf(s, "%s %s %s %s\n", no_value, no_value, no_value, no_value);
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} else {
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trace_seq_printf(s, "%9llu ", cpu_data->cur_user);
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trace_seq_printf(s, "%9llu ", cpu_data->min_user);
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trace_seq_printf(s, "%9llu ",
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cpu_data->sum_user / cpu_data->user_count);
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trace_seq_printf(s, "%9llu\n", cpu_data->max_user);
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}
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}
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/*
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* timerlat_top_print_sum - prints the summary output
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*/
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static void
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timerlat_top_print_sum(struct osnoise_tool *top, struct timerlat_top_cpu *summary)
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{
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const char *split = "----------------------------------------";
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struct timerlat_params *params = top->params;
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unsigned long long count = summary->irq_count;
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struct trace_seq *s = top->trace.seq;
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int e = 0;
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/*
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* Skip if no data is available: is this cpu offline?
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*/
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if (!summary->irq_count && !summary->thread_count)
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return;
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while (count > 999999) {
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e++;
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count /= 10;
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}
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trace_seq_printf(s, "%.*s|%.*s|%.*s", 15, split, 40, split, 39, split);
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if (params->user_data)
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trace_seq_printf(s, "-|%.*s", 39, split);
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trace_seq_printf(s, "\n");
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trace_seq_printf(s, "ALL #%-6llu e%d |", count, e);
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if (!summary->irq_count) {
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trace_seq_printf(s, " %s %s %s |", no_value, no_value, no_value);
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} else {
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trace_seq_printf(s, " ");
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trace_seq_printf(s, "%9llu ", summary->min_irq);
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trace_seq_printf(s, "%9llu ", summary->sum_irq / summary->irq_count);
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trace_seq_printf(s, "%9llu |", summary->max_irq);
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}
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if (!summary->thread_count) {
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trace_seq_printf(s, "%s %s %s %s", no_value, no_value, no_value, no_value);
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} else {
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trace_seq_printf(s, " ");
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trace_seq_printf(s, "%9llu ", summary->min_thread);
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trace_seq_printf(s, "%9llu ",
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summary->sum_thread / summary->thread_count);
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trace_seq_printf(s, "%9llu", summary->max_thread);
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}
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if (!params->user_data) {
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trace_seq_printf(s, "\n");
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return;
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}
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trace_seq_printf(s, " |");
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if (!summary->user_count) {
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trace_seq_printf(s, " %s %s %s |", no_value, no_value, no_value);
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} else {
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trace_seq_printf(s, " ");
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trace_seq_printf(s, "%9llu ", summary->min_user);
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trace_seq_printf(s, "%9llu ",
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summary->sum_user / summary->user_count);
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trace_seq_printf(s, "%9llu\n", summary->max_user);
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}
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}
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/*
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* clear_terminal - clears the output terminal
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*/
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static void clear_terminal(struct trace_seq *seq)
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{
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if (!config_debug)
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trace_seq_printf(seq, "\033c");
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}
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/*
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* timerlat_print_stats - print data for all cpus
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*/
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static void
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timerlat_print_stats(struct timerlat_params *params, struct osnoise_tool *top)
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{
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struct trace_instance *trace = &top->trace;
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struct timerlat_top_cpu summary;
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static int nr_cpus = -1;
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int i;
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if (params->aa_only)
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return;
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if (nr_cpus == -1)
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nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
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if (!params->quiet)
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clear_terminal(trace->seq);
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timerlat_top_reset_sum(&summary);
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timerlat_top_header(params, top);
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for (i = 0; i < nr_cpus; i++) {
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if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
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continue;
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timerlat_top_print(top, i);
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timerlat_top_update_sum(top, i, &summary);
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}
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timerlat_top_print_sum(top, &summary);
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trace_seq_do_printf(trace->seq);
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trace_seq_reset(trace->seq);
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osnoise_report_missed_events(top);
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}
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/*
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* timerlat_top_usage - prints timerlat top usage message
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*/
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static void timerlat_top_usage(char *usage)
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{
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int i;
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static const char *const msg[] = {
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"",
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" usage: rtla timerlat [top] [-h] [-q] [-a us] [-d s] [-D] [-n] [-p us] [-i us] [-T us] [-s us] \\",
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" [[-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
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" [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]] [-u|-k] [--warm-up s] [--deepest-idle-state n]",
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"",
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" -h/--help: print this menu",
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" -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
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" --aa-only us: stop if <us> latency is hit, only printing the auto analysis (reduces CPU usage)",
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" -p/--period us: timerlat period in us",
|
|
" -i/--irq us: stop trace if the irq latency is higher than the argument in us",
|
|
" -T/--thread us: stop trace if the thread latency is higher than the argument in us",
|
|
" -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
|
|
" -c/--cpus cpus: run the tracer only on the given cpus",
|
|
" -H/--house-keeping cpus: run rtla control threads only on the given cpus",
|
|
" -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
|
|
" -d/--duration time[s|m|h|d]: duration of the session",
|
|
" -D/--debug: print debug info",
|
|
" --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)",
|
|
" -t/--trace[file]: save the stopped trace to [file|timerlat_trace.txt]",
|
|
" -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
|
|
" --filter <command>: enable a trace event filter to the previous -e event",
|
|
" --trigger <command>: enable a trace event trigger to the previous -e event",
|
|
" -n/--nano: display data in nanoseconds",
|
|
" --no-aa: disable auto-analysis, reducing rtla timerlat cpu usage",
|
|
" -q/--quiet print only a summary at the end",
|
|
" --dma-latency us: set /dev/cpu_dma_latency latency <us> to reduce exit from idle latency",
|
|
" -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
|
|
" o:prio - use SCHED_OTHER with prio",
|
|
" r:prio - use SCHED_RR with prio",
|
|
" f:prio - use SCHED_FIFO with prio",
|
|
" d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
|
|
" in nanoseconds",
|
|
" -u/--user-threads: use rtla user-space threads instead of kernel-space timerlat threads",
|
|
" -k/--kernel-threads: use timerlat kernel-space threads instead of rtla user-space threads",
|
|
" -U/--user-load: enable timerlat for user-defined user-space workload",
|
|
" --warm-up s: let the workload run for s seconds before collecting data",
|
|
" --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
|
|
" --deepest-idle-state n: only go down to idle state n on cpus used by timerlat to reduce exit from idle latency",
|
|
NULL,
|
|
};
|
|
|
|
if (usage)
|
|
fprintf(stderr, "%s\n", usage);
|
|
|
|
fprintf(stderr, "rtla timerlat top: a per-cpu summary of the timer latency (version %s)\n",
|
|
VERSION);
|
|
|
|
for (i = 0; msg[i]; i++)
|
|
fprintf(stderr, "%s\n", msg[i]);
|
|
|
|
if (usage)
|
|
exit(EXIT_FAILURE);
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* timerlat_top_parse_args - allocs, parse and fill the cmd line parameters
|
|
*/
|
|
static struct timerlat_params
|
|
*timerlat_top_parse_args(int argc, char **argv)
|
|
{
|
|
struct timerlat_params *params;
|
|
struct trace_events *tevent;
|
|
long long auto_thresh;
|
|
int retval;
|
|
int c;
|
|
|
|
params = calloc(1, sizeof(*params));
|
|
if (!params)
|
|
exit(1);
|
|
|
|
/* disabled by default */
|
|
params->dma_latency = -1;
|
|
|
|
/* disabled by default */
|
|
params->deepest_idle_state = -2;
|
|
|
|
/* display data in microseconds */
|
|
params->output_divisor = 1000;
|
|
|
|
while (1) {
|
|
static struct option long_options[] = {
|
|
{"auto", required_argument, 0, 'a'},
|
|
{"cpus", required_argument, 0, 'c'},
|
|
{"cgroup", optional_argument, 0, 'C'},
|
|
{"debug", no_argument, 0, 'D'},
|
|
{"duration", required_argument, 0, 'd'},
|
|
{"event", required_argument, 0, 'e'},
|
|
{"help", no_argument, 0, 'h'},
|
|
{"house-keeping", required_argument, 0, 'H'},
|
|
{"irq", required_argument, 0, 'i'},
|
|
{"nano", no_argument, 0, 'n'},
|
|
{"period", required_argument, 0, 'p'},
|
|
{"priority", required_argument, 0, 'P'},
|
|
{"quiet", no_argument, 0, 'q'},
|
|
{"stack", required_argument, 0, 's'},
|
|
{"thread", required_argument, 0, 'T'},
|
|
{"trace", optional_argument, 0, 't'},
|
|
{"user-threads", no_argument, 0, 'u'},
|
|
{"kernel-threads", no_argument, 0, 'k'},
|
|
{"user-load", no_argument, 0, 'U'},
|
|
{"trigger", required_argument, 0, '0'},
|
|
{"filter", required_argument, 0, '1'},
|
|
{"dma-latency", required_argument, 0, '2'},
|
|
{"no-aa", no_argument, 0, '3'},
|
|
{"dump-tasks", no_argument, 0, '4'},
|
|
{"aa-only", required_argument, 0, '5'},
|
|
{"warm-up", required_argument, 0, '6'},
|
|
{"trace-buffer-size", required_argument, 0, '7'},
|
|
{"deepest-idle-state", required_argument, 0, '8'},
|
|
{0, 0, 0, 0}
|
|
};
|
|
|
|
/* getopt_long stores the option index here. */
|
|
int option_index = 0;
|
|
|
|
c = getopt_long(argc, argv, "a:c:C::d:De:hH:i:knp:P:qs:t::T:uU0:1:2:345:6:7:",
|
|
long_options, &option_index);
|
|
|
|
/* detect the end of the options. */
|
|
if (c == -1)
|
|
break;
|
|
|
|
switch (c) {
|
|
case 'a':
|
|
auto_thresh = get_llong_from_str(optarg);
|
|
|
|
/* set thread stop to auto_thresh */
|
|
params->stop_total_us = auto_thresh;
|
|
params->stop_us = auto_thresh;
|
|
|
|
/* get stack trace */
|
|
params->print_stack = auto_thresh;
|
|
|
|
/* set trace */
|
|
params->trace_output = "timerlat_trace.txt";
|
|
break;
|
|
case '5':
|
|
/* it is here because it is similar to -a */
|
|
auto_thresh = get_llong_from_str(optarg);
|
|
|
|
/* set thread stop to auto_thresh */
|
|
params->stop_total_us = auto_thresh;
|
|
params->stop_us = auto_thresh;
|
|
|
|
/* get stack trace */
|
|
params->print_stack = auto_thresh;
|
|
|
|
/* set aa_only to avoid parsing the trace */
|
|
params->aa_only = 1;
|
|
break;
|
|
case 'c':
|
|
retval = parse_cpu_set(optarg, ¶ms->monitored_cpus);
|
|
if (retval)
|
|
timerlat_top_usage("\nInvalid -c cpu list\n");
|
|
params->cpus = optarg;
|
|
break;
|
|
case 'C':
|
|
params->cgroup = 1;
|
|
if (!optarg) {
|
|
/* will inherit this cgroup */
|
|
params->cgroup_name = NULL;
|
|
} else if (*optarg == '=') {
|
|
/* skip the = */
|
|
params->cgroup_name = ++optarg;
|
|
}
|
|
break;
|
|
case 'D':
|
|
config_debug = 1;
|
|
break;
|
|
case 'd':
|
|
params->duration = parse_seconds_duration(optarg);
|
|
if (!params->duration)
|
|
timerlat_top_usage("Invalid -d duration\n");
|
|
break;
|
|
case 'e':
|
|
tevent = trace_event_alloc(optarg);
|
|
if (!tevent) {
|
|
err_msg("Error alloc trace event");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (params->events)
|
|
tevent->next = params->events;
|
|
params->events = tevent;
|
|
break;
|
|
case 'h':
|
|
case '?':
|
|
timerlat_top_usage(NULL);
|
|
break;
|
|
case 'H':
|
|
params->hk_cpus = 1;
|
|
retval = parse_cpu_set(optarg, ¶ms->hk_cpu_set);
|
|
if (retval) {
|
|
err_msg("Error parsing house keeping CPUs\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case 'i':
|
|
params->stop_us = get_llong_from_str(optarg);
|
|
break;
|
|
case 'k':
|
|
params->kernel_workload = true;
|
|
break;
|
|
case 'n':
|
|
params->output_divisor = 1;
|
|
break;
|
|
case 'p':
|
|
params->timerlat_period_us = get_llong_from_str(optarg);
|
|
if (params->timerlat_period_us > 1000000)
|
|
timerlat_top_usage("Period longer than 1 s\n");
|
|
break;
|
|
case 'P':
|
|
retval = parse_prio(optarg, ¶ms->sched_param);
|
|
if (retval == -1)
|
|
timerlat_top_usage("Invalid -P priority");
|
|
params->set_sched = 1;
|
|
break;
|
|
case 'q':
|
|
params->quiet = 1;
|
|
break;
|
|
case 's':
|
|
params->print_stack = get_llong_from_str(optarg);
|
|
break;
|
|
case 'T':
|
|
params->stop_total_us = get_llong_from_str(optarg);
|
|
break;
|
|
case 't':
|
|
if (optarg) {
|
|
if (optarg[0] == '=')
|
|
params->trace_output = &optarg[1];
|
|
else
|
|
params->trace_output = &optarg[0];
|
|
} else if (optind < argc && argv[optind][0] != '-')
|
|
params->trace_output = argv[optind];
|
|
else
|
|
params->trace_output = "timerlat_trace.txt";
|
|
|
|
break;
|
|
case 'u':
|
|
params->user_workload = true;
|
|
/* fallback: -u implies -U */
|
|
case 'U':
|
|
params->user_data = true;
|
|
break;
|
|
case '0': /* trigger */
|
|
if (params->events) {
|
|
retval = trace_event_add_trigger(params->events, optarg);
|
|
if (retval) {
|
|
err_msg("Error adding trigger %s\n", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
} else {
|
|
timerlat_top_usage("--trigger requires a previous -e\n");
|
|
}
|
|
break;
|
|
case '1': /* filter */
|
|
if (params->events) {
|
|
retval = trace_event_add_filter(params->events, optarg);
|
|
if (retval) {
|
|
err_msg("Error adding filter %s\n", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
} else {
|
|
timerlat_top_usage("--filter requires a previous -e\n");
|
|
}
|
|
break;
|
|
case '2': /* dma-latency */
|
|
params->dma_latency = get_llong_from_str(optarg);
|
|
if (params->dma_latency < 0 || params->dma_latency > 10000) {
|
|
err_msg("--dma-latency needs to be >= 0 and < 10000");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case '3': /* no-aa */
|
|
params->no_aa = 1;
|
|
break;
|
|
case '4':
|
|
params->dump_tasks = 1;
|
|
break;
|
|
case '6':
|
|
params->warmup = get_llong_from_str(optarg);
|
|
break;
|
|
case '7':
|
|
params->buffer_size = get_llong_from_str(optarg);
|
|
break;
|
|
case '8':
|
|
params->deepest_idle_state = get_llong_from_str(optarg);
|
|
break;
|
|
default:
|
|
timerlat_top_usage("Invalid option");
|
|
}
|
|
}
|
|
|
|
if (geteuid()) {
|
|
err_msg("rtla needs root permission\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/*
|
|
* Auto analysis only happens if stop tracing, thus:
|
|
*/
|
|
if (!params->stop_us && !params->stop_total_us)
|
|
params->no_aa = 1;
|
|
|
|
if (params->no_aa && params->aa_only)
|
|
timerlat_top_usage("--no-aa and --aa-only are mutually exclusive!");
|
|
|
|
if (params->kernel_workload && params->user_workload)
|
|
timerlat_top_usage("--kernel-threads and --user-threads are mutually exclusive!");
|
|
|
|
return params;
|
|
}
|
|
|
|
/*
|
|
* timerlat_top_apply_config - apply the top configs to the initialized tool
|
|
*/
|
|
static int
|
|
timerlat_top_apply_config(struct osnoise_tool *top, struct timerlat_params *params)
|
|
{
|
|
int retval;
|
|
|
|
retval = timerlat_apply_config(top, params);
|
|
if (retval)
|
|
goto out_err;
|
|
|
|
if (isatty(STDOUT_FILENO) && !params->quiet)
|
|
params->pretty_output = 1;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* timerlat_init_top - initialize a timerlat top tool with parameters
|
|
*/
|
|
static struct osnoise_tool
|
|
*timerlat_init_top(struct timerlat_params *params)
|
|
{
|
|
struct osnoise_tool *top;
|
|
int nr_cpus;
|
|
|
|
nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
|
|
|
|
top = osnoise_init_tool("timerlat_top");
|
|
if (!top)
|
|
return NULL;
|
|
|
|
top->data = timerlat_alloc_top(nr_cpus);
|
|
if (!top->data)
|
|
goto out_err;
|
|
|
|
top->params = params;
|
|
|
|
tep_register_event_handler(top->trace.tep, -1, "ftrace", "timerlat",
|
|
timerlat_top_handler, top);
|
|
|
|
return top;
|
|
|
|
out_err:
|
|
osnoise_destroy_tool(top);
|
|
return NULL;
|
|
}
|
|
|
|
static int stop_tracing;
|
|
static struct trace_instance *top_inst = NULL;
|
|
static void stop_top(int sig)
|
|
{
|
|
if (stop_tracing) {
|
|
/*
|
|
* Stop requested twice in a row; abort event processing and
|
|
* exit immediately
|
|
*/
|
|
tracefs_iterate_stop(top_inst->inst);
|
|
return;
|
|
}
|
|
stop_tracing = 1;
|
|
if (top_inst)
|
|
trace_instance_stop(top_inst);
|
|
}
|
|
|
|
/*
|
|
* timerlat_top_set_signals - handles the signal to stop the tool
|
|
*/
|
|
static void
|
|
timerlat_top_set_signals(struct timerlat_params *params)
|
|
{
|
|
signal(SIGINT, stop_top);
|
|
if (params->duration) {
|
|
signal(SIGALRM, stop_top);
|
|
alarm(params->duration);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* timerlat_top_main_loop - main loop to process events
|
|
*/
|
|
static int
|
|
timerlat_top_main_loop(struct osnoise_tool *top,
|
|
struct osnoise_tool *record,
|
|
struct timerlat_params *params,
|
|
struct timerlat_u_params *params_u)
|
|
{
|
|
struct trace_instance *trace = &top->trace;
|
|
int retval;
|
|
|
|
while (!stop_tracing) {
|
|
sleep(params->sleep_time);
|
|
|
|
if (params->aa_only && !osnoise_trace_is_off(top, record))
|
|
continue;
|
|
|
|
retval = tracefs_iterate_raw_events(trace->tep,
|
|
trace->inst,
|
|
NULL,
|
|
0,
|
|
collect_registered_events,
|
|
trace);
|
|
if (retval < 0) {
|
|
err_msg("Error iterating on events\n");
|
|
return retval;
|
|
}
|
|
|
|
if (!params->quiet)
|
|
timerlat_print_stats(params, top);
|
|
|
|
if (osnoise_trace_is_off(top, record))
|
|
break;
|
|
|
|
/* is there still any user-threads ? */
|
|
if (params->user_workload) {
|
|
if (params_u->stopped_running) {
|
|
debug_msg("timerlat user space threads stopped!\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timerlat_top_bpf_main_loop - main loop to process events (BPF variant)
|
|
*/
|
|
static int
|
|
timerlat_top_bpf_main_loop(struct osnoise_tool *top,
|
|
struct osnoise_tool *record,
|
|
struct timerlat_params *params,
|
|
struct timerlat_u_params *params_u)
|
|
{
|
|
int retval, wait_retval;
|
|
|
|
if (params->aa_only) {
|
|
/* Auto-analysis only, just wait for stop tracing */
|
|
timerlat_bpf_wait(-1);
|
|
return 0;
|
|
}
|
|
|
|
if (params->quiet) {
|
|
/* Quiet mode: wait for stop and then, print results */
|
|
timerlat_bpf_wait(-1);
|
|
|
|
retval = timerlat_top_bpf_pull_data(top);
|
|
if (retval) {
|
|
err_msg("Error pulling BPF data\n");
|
|
return retval;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Pull and display data in a loop */
|
|
while (!stop_tracing) {
|
|
wait_retval = timerlat_bpf_wait(params->sleep_time);
|
|
|
|
retval = timerlat_top_bpf_pull_data(top);
|
|
if (retval) {
|
|
err_msg("Error pulling BPF data\n");
|
|
return retval;
|
|
}
|
|
|
|
timerlat_print_stats(params, top);
|
|
|
|
if (wait_retval == 1)
|
|
/* Stopping requested by tracer */
|
|
break;
|
|
|
|
/* is there still any user-threads ? */
|
|
if (params->user_workload) {
|
|
if (params_u->stopped_running) {
|
|
debug_msg("timerlat user space threads stopped!\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int timerlat_top_main(int argc, char *argv[])
|
|
{
|
|
struct timerlat_params *params;
|
|
struct osnoise_tool *record = NULL;
|
|
struct timerlat_u_params params_u;
|
|
struct osnoise_tool *top = NULL;
|
|
struct osnoise_tool *aa = NULL;
|
|
struct trace_instance *trace;
|
|
int dma_latency_fd = -1;
|
|
pthread_t timerlat_u;
|
|
int return_value = 1;
|
|
char *max_lat;
|
|
int retval;
|
|
int nr_cpus, i;
|
|
bool no_bpf = false;
|
|
|
|
params = timerlat_top_parse_args(argc, argv);
|
|
if (!params)
|
|
exit(1);
|
|
|
|
top = timerlat_init_top(params);
|
|
if (!top) {
|
|
err_msg("Could not init osnoise top\n");
|
|
goto out_exit;
|
|
}
|
|
|
|
retval = timerlat_top_apply_config(top, params);
|
|
if (retval) {
|
|
err_msg("Could not apply config\n");
|
|
goto out_free;
|
|
}
|
|
|
|
trace = &top->trace;
|
|
/*
|
|
* Save trace instance into global variable so that SIGINT can stop
|
|
* the timerlat tracer.
|
|
* Otherwise, rtla could loop indefinitely when overloaded.
|
|
*/
|
|
top_inst = trace;
|
|
|
|
if (getenv("RTLA_NO_BPF") && strncmp(getenv("RTLA_NO_BPF"), "1", 2) == 0) {
|
|
debug_msg("RTLA_NO_BPF set, disabling BPF\n");
|
|
no_bpf = true;
|
|
}
|
|
|
|
if (!no_bpf && !tep_find_event_by_name(trace->tep, "osnoise", "timerlat_sample")) {
|
|
debug_msg("osnoise:timerlat_sample missing, disabling BPF\n");
|
|
no_bpf = true;
|
|
}
|
|
|
|
if (!no_bpf) {
|
|
retval = timerlat_bpf_init(params);
|
|
if (retval) {
|
|
debug_msg("Could not enable BPF\n");
|
|
no_bpf = true;
|
|
}
|
|
}
|
|
|
|
retval = enable_timerlat(trace);
|
|
if (retval) {
|
|
err_msg("Failed to enable timerlat tracer\n");
|
|
goto out_free;
|
|
}
|
|
|
|
if (params->set_sched) {
|
|
retval = set_comm_sched_attr("timerlat/", ¶ms->sched_param);
|
|
if (retval) {
|
|
err_msg("Failed to set sched parameters\n");
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
if (params->cgroup && !params->user_data) {
|
|
retval = set_comm_cgroup("timerlat/", params->cgroup_name);
|
|
if (!retval) {
|
|
err_msg("Failed to move threads to cgroup\n");
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
if (params->dma_latency >= 0) {
|
|
dma_latency_fd = set_cpu_dma_latency(params->dma_latency);
|
|
if (dma_latency_fd < 0) {
|
|
err_msg("Could not set /dev/cpu_dma_latency.\n");
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
if (params->deepest_idle_state >= -1) {
|
|
if (!have_libcpupower_support()) {
|
|
err_msg("rtla built without libcpupower, --deepest-idle-state is not supported\n");
|
|
goto out_free;
|
|
}
|
|
|
|
nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
|
|
|
|
for (i = 0; i < nr_cpus; i++) {
|
|
if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
|
|
continue;
|
|
if (save_cpu_idle_disable_state(i) < 0) {
|
|
err_msg("Could not save cpu idle state.\n");
|
|
goto out_free;
|
|
}
|
|
if (set_deepest_cpu_idle_state(i, params->deepest_idle_state) < 0) {
|
|
err_msg("Could not set deepest cpu idle state.\n");
|
|
goto out_free;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (params->trace_output) {
|
|
record = osnoise_init_trace_tool("timerlat");
|
|
if (!record) {
|
|
err_msg("Failed to enable the trace instance\n");
|
|
goto out_free;
|
|
}
|
|
|
|
if (params->events) {
|
|
retval = trace_events_enable(&record->trace, params->events);
|
|
if (retval)
|
|
goto out_top;
|
|
}
|
|
|
|
if (params->buffer_size > 0) {
|
|
retval = trace_set_buffer_size(&record->trace, params->buffer_size);
|
|
if (retval)
|
|
goto out_top;
|
|
}
|
|
}
|
|
|
|
if (!params->no_aa) {
|
|
aa = osnoise_init_tool("timerlat_aa");
|
|
if (!aa)
|
|
goto out_top;
|
|
|
|
retval = timerlat_aa_init(aa, params->dump_tasks);
|
|
if (retval) {
|
|
err_msg("Failed to enable the auto analysis instance\n");
|
|
goto out_top;
|
|
}
|
|
|
|
/* if it is re-using the main instance, there is no need to start it */
|
|
if (aa != top) {
|
|
retval = enable_timerlat(&aa->trace);
|
|
if (retval) {
|
|
err_msg("Failed to enable timerlat tracer\n");
|
|
goto out_top;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (params->user_workload) {
|
|
/* rtla asked to stop */
|
|
params_u.should_run = 1;
|
|
/* all threads left */
|
|
params_u.stopped_running = 0;
|
|
|
|
params_u.set = ¶ms->monitored_cpus;
|
|
if (params->set_sched)
|
|
params_u.sched_param = ¶ms->sched_param;
|
|
else
|
|
params_u.sched_param = NULL;
|
|
|
|
params_u.cgroup_name = params->cgroup_name;
|
|
|
|
retval = pthread_create(&timerlat_u, NULL, timerlat_u_dispatcher, ¶ms_u);
|
|
if (retval)
|
|
err_msg("Error creating timerlat user-space threads\n");
|
|
}
|
|
|
|
if (params->warmup > 0) {
|
|
debug_msg("Warming up for %d seconds\n", params->warmup);
|
|
sleep(params->warmup);
|
|
}
|
|
|
|
/*
|
|
* Start the tracers here, after having set all instances.
|
|
*
|
|
* Let the trace instance start first for the case of hitting a stop
|
|
* tracing while enabling other instances. The trace instance is the
|
|
* one with most valuable information.
|
|
*/
|
|
if (params->trace_output)
|
|
trace_instance_start(&record->trace);
|
|
if (!params->no_aa)
|
|
trace_instance_start(&aa->trace);
|
|
if (no_bpf) {
|
|
trace_instance_start(trace);
|
|
} else {
|
|
retval = timerlat_bpf_attach();
|
|
if (retval) {
|
|
err_msg("Error attaching BPF program\n");
|
|
goto out_top;
|
|
}
|
|
}
|
|
|
|
top->start_time = time(NULL);
|
|
timerlat_top_set_signals(params);
|
|
|
|
if (no_bpf)
|
|
retval = timerlat_top_main_loop(top, record, params, ¶ms_u);
|
|
else
|
|
retval = timerlat_top_bpf_main_loop(top, record, params, ¶ms_u);
|
|
|
|
if (retval)
|
|
goto out_top;
|
|
|
|
if (!no_bpf)
|
|
timerlat_bpf_detach();
|
|
|
|
if (params->user_workload && !params_u.stopped_running) {
|
|
params_u.should_run = 0;
|
|
sleep(1);
|
|
}
|
|
|
|
timerlat_print_stats(params, top);
|
|
|
|
return_value = 0;
|
|
|
|
if (osnoise_trace_is_off(top, record) && !stop_tracing) {
|
|
printf("rtla timerlat hit stop tracing\n");
|
|
|
|
if (!params->no_aa)
|
|
timerlat_auto_analysis(params->stop_us, params->stop_total_us);
|
|
|
|
if (params->trace_output) {
|
|
printf(" Saving trace to %s\n", params->trace_output);
|
|
save_trace_to_file(record->trace.inst, params->trace_output);
|
|
}
|
|
} else if (params->aa_only) {
|
|
/*
|
|
* If the trace did not stop with --aa-only, at least print the
|
|
* max known latency.
|
|
*/
|
|
max_lat = tracefs_instance_file_read(trace->inst, "tracing_max_latency", NULL);
|
|
if (max_lat) {
|
|
printf(" Max latency was %s\n", max_lat);
|
|
free(max_lat);
|
|
}
|
|
}
|
|
|
|
out_top:
|
|
timerlat_aa_destroy();
|
|
if (dma_latency_fd >= 0)
|
|
close(dma_latency_fd);
|
|
if (params->deepest_idle_state >= -1) {
|
|
for (i = 0; i < nr_cpus; i++) {
|
|
if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus))
|
|
continue;
|
|
restore_cpu_idle_disable_state(i);
|
|
}
|
|
}
|
|
trace_events_destroy(&record->trace, params->events);
|
|
params->events = NULL;
|
|
out_free:
|
|
timerlat_free_top(top->data);
|
|
if (aa && aa != top)
|
|
osnoise_destroy_tool(aa);
|
|
osnoise_destroy_tool(record);
|
|
osnoise_destroy_tool(top);
|
|
free(params);
|
|
free_cpu_idle_disable_states();
|
|
out_exit:
|
|
exit(return_value);
|
|
}
|