791 lines
19 KiB
C
791 lines
19 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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#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 "utils.h"
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#include "osnoise.h"
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#include "timerlat.h"
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#include "timerlat_aa.h"
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struct timerlat_top_params {
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char *cpus;
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char *monitored_cpus;
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char *trace_output;
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unsigned long long runtime;
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long long stop_us;
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long long stop_total_us;
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long long timerlat_period_us;
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long long print_stack;
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int sleep_time;
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int output_divisor;
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int duration;
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int quiet;
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int set_sched;
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int dma_latency;
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int no_aa;
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int aa_only;
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int dump_tasks;
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struct sched_attr sched_param;
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struct trace_events *events;
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};
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struct timerlat_top_cpu {
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int irq_count;
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int thread_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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};
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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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}
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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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/*
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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_top_data *data = tool->data;
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struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
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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 {
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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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}
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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_top_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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if (!params->no_aa)
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timerlat_aa_handler(s, record, event, context);
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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 osnoise_tool *top)
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{
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struct timerlat_top_params *params = top->params;
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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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trace_seq_printf(s, "\033[2;37;40m");
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trace_seq_printf(s, " Timer Latency ");
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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)\n", 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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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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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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/*
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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_top_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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int divisor = params->output_divisor;
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struct trace_seq *s = top->trace.seq;
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if (divisor == 0)
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return;
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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 #%-9d |", cpu, cpu_data->irq_count);
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if (!cpu_data->irq_count) {
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trace_seq_printf(s, " - ");
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trace_seq_printf(s, " - ");
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trace_seq_printf(s, " - ");
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trace_seq_printf(s, " - |");
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} else {
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trace_seq_printf(s, "%9llu ", cpu_data->cur_irq / params->output_divisor);
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trace_seq_printf(s, "%9llu ", cpu_data->min_irq / params->output_divisor);
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trace_seq_printf(s, "%9llu ", (cpu_data->sum_irq / cpu_data->irq_count) / divisor);
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trace_seq_printf(s, "%9llu |", cpu_data->max_irq / divisor);
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}
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if (!cpu_data->thread_count) {
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trace_seq_printf(s, " - ");
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trace_seq_printf(s, " - ");
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trace_seq_printf(s, " - ");
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trace_seq_printf(s, " -\n");
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} else {
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trace_seq_printf(s, "%9llu ", cpu_data->cur_thread / divisor);
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trace_seq_printf(s, "%9llu ", cpu_data->min_thread / divisor);
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trace_seq_printf(s, "%9llu ",
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(cpu_data->sum_thread / cpu_data->thread_count) / divisor);
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trace_seq_printf(s, "%9llu\n", cpu_data->max_thread / divisor);
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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_top_params *params, struct osnoise_tool *top)
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{
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struct trace_instance *trace = &top->trace;
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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_header(top);
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for (i = 0; i < nr_cpus; i++) {
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if (params->cpus && !params->monitored_cpus[i])
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continue;
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timerlat_top_print(top, i);
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}
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trace_seq_do_printf(trace->seq);
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trace_seq_reset(trace->seq);
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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] \\",
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" [-P priority] [--dma-latency us] [--aa-only us]",
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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",
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" -i/--irq us: stop trace if the irq latency is higher than the argument in us",
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" -T/--thread us: stop trace if the thread latency is higher than the argument in us",
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" -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
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" -c/--cpus cpus: run the tracer only on the given cpus",
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" -d/--duration time[m|h|d]: duration of the session in seconds",
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" -D/--debug: print debug info",
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" --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)",
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" -t/--trace[=file]: save the stopped trace to [file|timerlat_trace.txt]",
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" -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
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" --filter <command>: enable a trace event filter to the previous -e event",
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" --trigger <command>: enable a trace event trigger to the previous -e event",
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" -n/--nano: display data in nanoseconds",
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" --no-aa: disable auto-analysis, reducing rtla timerlat cpu usage",
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" -q/--quiet print only a summary at the end",
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" --dma-latency us: set /dev/cpu_dma_latency latency <us> to reduce exit from idle latency",
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" -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
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" o:prio - use SCHED_OTHER with prio",
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" r:prio - use SCHED_RR with prio",
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" f:prio - use SCHED_FIFO with prio",
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" d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
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" in nanoseconds",
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NULL,
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};
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if (usage)
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fprintf(stderr, "%s\n", usage);
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fprintf(stderr, "rtla timerlat top: a per-cpu summary of the timer latency (version %s)\n",
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VERSION);
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for (i = 0; msg[i]; i++)
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fprintf(stderr, "%s\n", msg[i]);
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exit(1);
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}
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/*
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* timerlat_top_parse_args - allocs, parse and fill the cmd line parameters
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*/
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static struct timerlat_top_params
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*timerlat_top_parse_args(int argc, char **argv)
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{
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struct timerlat_top_params *params;
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struct trace_events *tevent;
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long long auto_thresh;
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int retval;
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int c;
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params = calloc(1, sizeof(*params));
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if (!params)
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exit(1);
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/* disabled by default */
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params->dma_latency = -1;
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/* display data in microseconds */
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params->output_divisor = 1000;
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while (1) {
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static struct option long_options[] = {
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{"auto", required_argument, 0, 'a'},
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{"cpus", required_argument, 0, 'c'},
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{"debug", no_argument, 0, 'D'},
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{"duration", required_argument, 0, 'd'},
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{"event", required_argument, 0, 'e'},
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{"help", no_argument, 0, 'h'},
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{"irq", required_argument, 0, 'i'},
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{"nano", no_argument, 0, 'n'},
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{"period", required_argument, 0, 'p'},
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{"priority", required_argument, 0, 'P'},
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{"quiet", no_argument, 0, 'q'},
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{"stack", required_argument, 0, 's'},
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{"thread", required_argument, 0, 'T'},
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{"trace", optional_argument, 0, 't'},
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{"trigger", required_argument, 0, '0'},
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{"filter", required_argument, 0, '1'},
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{"dma-latency", required_argument, 0, '2'},
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{"no-aa", no_argument, 0, '3'},
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{"dump-tasks", no_argument, 0, '4'},
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{"aa-only", required_argument, 0, '5'},
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{0, 0, 0, 0}
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};
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/* getopt_long stores the option index here. */
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int option_index = 0;
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c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:2:345:",
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long_options, &option_index);
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/* detect the end of the options. */
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if (c == -1)
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break;
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switch (c) {
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case 'a':
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auto_thresh = get_llong_from_str(optarg);
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/* set thread stop to auto_thresh */
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params->stop_total_us = auto_thresh;
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params->stop_us = auto_thresh;
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/* get stack trace */
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params->print_stack = auto_thresh;
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/* set trace */
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params->trace_output = "timerlat_trace.txt";
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break;
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case '5':
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/* it is here because it is similar to -a */
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auto_thresh = get_llong_from_str(optarg);
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/* set thread stop to auto_thresh */
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params->stop_total_us = auto_thresh;
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params->stop_us = auto_thresh;
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/* get stack trace */
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params->print_stack = auto_thresh;
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/* set aa_only to avoid parsing the trace */
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params->aa_only = 1;
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break;
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case 'c':
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retval = parse_cpu_list(optarg, ¶ms->monitored_cpus);
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if (retval)
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timerlat_top_usage("\nInvalid -c cpu list\n");
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params->cpus = optarg;
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break;
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case 'D':
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config_debug = 1;
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break;
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case 'd':
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params->duration = parse_seconds_duration(optarg);
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if (!params->duration)
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timerlat_top_usage("Invalid -D duration\n");
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break;
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case 'e':
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tevent = trace_event_alloc(optarg);
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if (!tevent) {
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err_msg("Error alloc trace event");
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exit(EXIT_FAILURE);
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}
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if (params->events)
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tevent->next = params->events;
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params->events = tevent;
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break;
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case 'h':
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case '?':
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timerlat_top_usage(NULL);
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break;
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case 'i':
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params->stop_us = get_llong_from_str(optarg);
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break;
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case 'n':
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params->output_divisor = 1;
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break;
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case 'p':
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params->timerlat_period_us = get_llong_from_str(optarg);
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if (params->timerlat_period_us > 1000000)
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timerlat_top_usage("Period longer than 1 s\n");
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break;
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case 'P':
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retval = parse_prio(optarg, ¶ms->sched_param);
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if (retval == -1)
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timerlat_top_usage("Invalid -P priority");
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params->set_sched = 1;
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break;
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case 'q':
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params->quiet = 1;
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break;
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case 's':
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params->print_stack = get_llong_from_str(optarg);
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break;
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case 'T':
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params->stop_total_us = get_llong_from_str(optarg);
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break;
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case 't':
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if (optarg)
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/* skip = */
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params->trace_output = &optarg[1];
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else
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params->trace_output = "timerlat_trace.txt";
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break;
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case '0': /* trigger */
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if (params->events) {
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retval = trace_event_add_trigger(params->events, optarg);
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if (retval) {
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err_msg("Error adding trigger %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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} else {
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timerlat_top_usage("--trigger requires a previous -e\n");
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}
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break;
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case '1': /* filter */
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if (params->events) {
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retval = trace_event_add_filter(params->events, optarg);
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if (retval) {
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err_msg("Error adding filter %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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} else {
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timerlat_top_usage("--filter requires a previous -e\n");
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}
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break;
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case '2': /* dma-latency */
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params->dma_latency = get_llong_from_str(optarg);
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if (params->dma_latency < 0 || params->dma_latency > 10000) {
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err_msg("--dma-latency needs to be >= 0 and < 10000");
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exit(EXIT_FAILURE);
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}
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break;
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case '3': /* no-aa */
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params->no_aa = 1;
|
|
break;
|
|
case '4':
|
|
params->dump_tasks = 1;
|
|
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!");
|
|
|
|
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_top_params *params)
|
|
{
|
|
int retval;
|
|
|
|
if (!params->sleep_time)
|
|
params->sleep_time = 1;
|
|
|
|
if (params->cpus) {
|
|
retval = osnoise_set_cpus(top->context, params->cpus);
|
|
if (retval) {
|
|
err_msg("Failed to apply CPUs config\n");
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (params->stop_us) {
|
|
retval = osnoise_set_stop_us(top->context, params->stop_us);
|
|
if (retval) {
|
|
err_msg("Failed to set stop us\n");
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (params->stop_total_us) {
|
|
retval = osnoise_set_stop_total_us(top->context, params->stop_total_us);
|
|
if (retval) {
|
|
err_msg("Failed to set stop total us\n");
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
|
|
if (params->timerlat_period_us) {
|
|
retval = osnoise_set_timerlat_period_us(top->context, params->timerlat_period_us);
|
|
if (retval) {
|
|
err_msg("Failed to set timerlat period\n");
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
|
|
if (params->print_stack) {
|
|
retval = osnoise_set_print_stack(top->context, params->print_stack);
|
|
if (retval) {
|
|
err_msg("Failed to set print stack\n");
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
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_top_params *params)
|
|
{
|
|
struct osnoise_tool *top;
|
|
int nr_cpus;
|
|
int retval;
|
|
|
|
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);
|
|
|
|
/*
|
|
* If no auto analysis, we are ready.
|
|
*/
|
|
if (params->no_aa)
|
|
return top;
|
|
|
|
retval = timerlat_aa_init(top, nr_cpus, params->dump_tasks);
|
|
if (retval)
|
|
goto out_err;
|
|
|
|
return top;
|
|
|
|
out_err:
|
|
osnoise_destroy_tool(top);
|
|
return NULL;
|
|
}
|
|
|
|
static int stop_tracing;
|
|
static void stop_top(int sig)
|
|
{
|
|
stop_tracing = 1;
|
|
}
|
|
|
|
/*
|
|
* timerlat_top_set_signals - handles the signal to stop the tool
|
|
*/
|
|
static void
|
|
timerlat_top_set_signals(struct timerlat_top_params *params)
|
|
{
|
|
signal(SIGINT, stop_top);
|
|
if (params->duration) {
|
|
signal(SIGALRM, stop_top);
|
|
alarm(params->duration);
|
|
}
|
|
}
|
|
|
|
int timerlat_top_main(int argc, char *argv[])
|
|
{
|
|
struct timerlat_top_params *params;
|
|
struct osnoise_tool *record = NULL;
|
|
struct osnoise_tool *top = NULL;
|
|
struct trace_instance *trace;
|
|
int dma_latency_fd = -1;
|
|
int return_value = 1;
|
|
char *max_lat;
|
|
int retval;
|
|
|
|
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;
|
|
|
|
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->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;
|
|
}
|
|
}
|
|
|
|
trace_instance_start(trace);
|
|
|
|
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;
|
|
}
|
|
|
|
trace_instance_start(&record->trace);
|
|
}
|
|
|
|
top->start_time = time(NULL);
|
|
timerlat_top_set_signals(params);
|
|
|
|
while (!stop_tracing) {
|
|
sleep(params->sleep_time);
|
|
|
|
if (params->aa_only && !trace_is_off(&top->trace, &record->trace))
|
|
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");
|
|
goto out_top;
|
|
}
|
|
|
|
if (!params->quiet)
|
|
timerlat_print_stats(params, top);
|
|
|
|
if (trace_is_off(&top->trace, &record->trace))
|
|
break;
|
|
|
|
}
|
|
|
|
timerlat_print_stats(params, top);
|
|
|
|
return_value = 0;
|
|
|
|
if (trace_is_off(&top->trace, &record->trace)) {
|
|
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:
|
|
if (dma_latency_fd >= 0)
|
|
close(dma_latency_fd);
|
|
trace_events_destroy(&record->trace, params->events);
|
|
params->events = NULL;
|
|
out_free:
|
|
timerlat_free_top(top->data);
|
|
timerlat_aa_destroy();
|
|
osnoise_destroy_tool(record);
|
|
osnoise_destroy_tool(top);
|
|
free(params);
|
|
out_exit:
|
|
exit(return_value);
|
|
}
|