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1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org> */ #define _GNU_SOURCE #include <getopt.h> #include <stdlib.h> #include <string.h> #include <signal.h> #include <unistd.h> #include <stdio.h> #include <time.h> #include <sched.h> #include <pthread.h> #include "utils.h" #include "osnoise.h" #include "timerlat.h" #include "timerlat_aa.h" #include "timerlat_u.h" struct timerlat_hist_params { char *cpus; cpu_set_t monitored_cpus; char *trace_output; char *cgroup_name; unsigned long long runtime; long long stop_us; long long stop_total_us; long long timerlat_period_us; long long print_stack; int sleep_time; int output_divisor; int duration; int set_sched; int dma_latency; int cgroup; int hk_cpus; int no_aa; int dump_tasks; int user_hist; cpu_set_t hk_cpu_set; struct sched_attr sched_param; struct trace_events *events; char no_irq; char no_thread; char no_header; char no_summary; char no_index; char with_zeros; int bucket_size; int entries; }; struct timerlat_hist_cpu { int *irq; int *thread; int *user; int irq_count; int thread_count; int user_count; unsigned long long min_irq; unsigned long long sum_irq; unsigned long long max_irq; unsigned long long min_thread; unsigned long long sum_thread; unsigned long long max_thread; unsigned long long min_user; unsigned long long sum_user; unsigned long long max_user; }; struct timerlat_hist_data { struct timerlat_hist_cpu *hist; int entries; int bucket_size; int nr_cpus; }; /* * timerlat_free_histogram - free runtime data */ static void timerlat_free_histogram(struct timerlat_hist_data *data) { int cpu; /* one histogram for IRQ and one for thread, per CPU */ for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (data->hist[cpu].irq) free(data->hist[cpu].irq); if (data->hist[cpu].thread) free(data->hist[cpu].thread); if (data->hist[cpu].user) free(data->hist[cpu].user); } /* one set of histograms per CPU */ if (data->hist) free(data->hist); free(data); } /* * timerlat_alloc_histogram - alloc runtime data */ static struct timerlat_hist_data *timerlat_alloc_histogram(int nr_cpus, int entries, int bucket_size) { struct timerlat_hist_data *data; int cpu; data = calloc(1, sizeof(*data)); if (!data) return NULL; data->entries = entries; data->bucket_size = bucket_size; data->nr_cpus = nr_cpus; /* one set of histograms per CPU */ data->hist = calloc(1, sizeof(*data->hist) * nr_cpus); if (!data->hist) goto cleanup; /* one histogram for IRQ and one for thread, per cpu */ for (cpu = 0; cpu < nr_cpus; cpu++) { data->hist[cpu].irq = calloc(1, sizeof(*data->hist->irq) * (entries + 1)); if (!data->hist[cpu].irq) goto cleanup; data->hist[cpu].thread = calloc(1, sizeof(*data->hist->thread) * (entries + 1)); if (!data->hist[cpu].thread) goto cleanup; data->hist[cpu].user = calloc(1, sizeof(*data->hist->user) * (entries + 1)); if (!data->hist[cpu].user) goto cleanup; } /* set the min to max */ for (cpu = 0; cpu < nr_cpus; cpu++) { data->hist[cpu].min_irq = ~0; data->hist[cpu].min_thread = ~0; data->hist[cpu].min_user = ~0; } return data; cleanup: timerlat_free_histogram(data); return NULL; } /* * timerlat_hist_update - record a new timerlat occurent on cpu, updating data */ static void timerlat_hist_update(struct osnoise_tool *tool, int cpu, unsigned long long context, unsigned long long latency) { struct timerlat_hist_params *params = tool->params; struct timerlat_hist_data *data = tool->data; int entries = data->entries; int bucket; int *hist; if (params->output_divisor) latency = latency / params->output_divisor; if (data->bucket_size) bucket = latency / data->bucket_size; if (!context) { hist = data->hist[cpu].irq; data->hist[cpu].irq_count++; update_min(&data->hist[cpu].min_irq, &latency); update_sum(&data->hist[cpu].sum_irq, &latency); update_max(&data->hist[cpu].max_irq, &latency); } else if (context == 1) { hist = data->hist[cpu].thread; data->hist[cpu].thread_count++; update_min(&data->hist[cpu].min_thread, &latency); update_sum(&data->hist[cpu].sum_thread, &latency); update_max(&data->hist[cpu].max_thread, &latency); } else { /* user */ hist = data->hist[cpu].user; data->hist[cpu].user_count++; update_min(&data->hist[cpu].min_user, &latency); update_sum(&data->hist[cpu].sum_user, &latency); update_max(&data->hist[cpu].max_user, &latency); } if (bucket < entries) hist[bucket]++; else hist[entries]++; } /* * timerlat_hist_handler - this is the handler for timerlat tracer events */ static int timerlat_hist_handler(struct trace_seq *s, struct tep_record *record, struct tep_event *event, void *data) { struct trace_instance *trace = data; unsigned long long context, latency; struct osnoise_tool *tool; int cpu = record->cpu; tool = container_of(trace, struct osnoise_tool, trace); tep_get_field_val(s, event, "context", record, &context, 1); tep_get_field_val(s, event, "timer_latency", record, &latency, 1); timerlat_hist_update(tool, cpu, context, latency); return 0; } /* * timerlat_hist_header - print the header of the tracer to the output */ static void timerlat_hist_header(struct osnoise_tool *tool) { struct timerlat_hist_params *params = tool->params; struct timerlat_hist_data *data = tool->data; struct trace_seq *s = tool->trace.seq; char duration[26]; int cpu; if (params->no_header) return; get_duration(tool->start_time, duration, sizeof(duration)); trace_seq_printf(s, "# RTLA timerlat histogram\n"); trace_seq_printf(s, "# Time unit is %s (%s)\n", params->output_divisor == 1 ? "nanoseconds" : "microseconds", params->output_divisor == 1 ? "ns" : "us"); trace_seq_printf(s, "# Duration: %s\n", duration); if (!params->no_index) trace_seq_printf(s, "Index"); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) trace_seq_printf(s, " IRQ-%03d", cpu); if (!params->no_thread) trace_seq_printf(s, " Thr-%03d", cpu); if (params->user_hist) trace_seq_printf(s, " Usr-%03d", cpu); } trace_seq_printf(s, "\n"); trace_seq_do_printf(s); trace_seq_reset(s); } /* * timerlat_print_summary - print the summary of the hist data to the output */ static void timerlat_print_summary(struct timerlat_hist_params *params, struct trace_instance *trace, struct timerlat_hist_data *data) { int cpu; if (params->no_summary) return; if (!params->no_index) trace_seq_printf(trace->seq, "count:"); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].irq_count); if (!params->no_thread) trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].thread_count); if (params->user_hist) trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].user_count); } trace_seq_printf(trace->seq, "\n"); if (!params->no_index) trace_seq_printf(trace->seq, "min: "); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_irq); if (!params->no_thread) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_thread); if (params->user_hist) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_user); } trace_seq_printf(trace->seq, "\n"); if (!params->no_index) trace_seq_printf(trace->seq, "avg: "); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) { if (data->hist[cpu].irq_count) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].sum_irq / data->hist[cpu].irq_count); else trace_seq_printf(trace->seq, " - "); } if (!params->no_thread) { if (data->hist[cpu].thread_count) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].sum_thread / data->hist[cpu].thread_count); else trace_seq_printf(trace->seq, " - "); } if (params->user_hist) { if (data->hist[cpu].user_count) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].sum_user / data->hist[cpu].user_count); else trace_seq_printf(trace->seq, " - "); } } trace_seq_printf(trace->seq, "\n"); if (!params->no_index) trace_seq_printf(trace->seq, "max: "); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_irq); if (!params->no_thread) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_thread); if (params->user_hist) trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_user); } trace_seq_printf(trace->seq, "\n"); trace_seq_do_printf(trace->seq); trace_seq_reset(trace->seq); } /* * timerlat_print_stats - print data for all CPUs */ static void timerlat_print_stats(struct timerlat_hist_params *params, struct osnoise_tool *tool) { struct timerlat_hist_data *data = tool->data; struct trace_instance *trace = &tool->trace; int bucket, cpu; int total; timerlat_hist_header(tool); for (bucket = 0; bucket < data->entries; bucket++) { total = 0; if (!params->no_index) trace_seq_printf(trace->seq, "%-6d", bucket * data->bucket_size); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) { total += data->hist[cpu].irq[bucket]; trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].irq[bucket]); } if (!params->no_thread) { total += data->hist[cpu].thread[bucket]; trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].thread[bucket]); } if (params->user_hist) { total += data->hist[cpu].user[bucket]; trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].user[bucket]); } } if (total == 0 && !params->with_zeros) { trace_seq_reset(trace->seq); continue; } trace_seq_printf(trace->seq, "\n"); trace_seq_do_printf(trace->seq); trace_seq_reset(trace->seq); } if (!params->no_index) trace_seq_printf(trace->seq, "over: "); for (cpu = 0; cpu < data->nr_cpus; cpu++) { if (params->cpus && !CPU_ISSET(cpu, ¶ms->monitored_cpus)) continue; if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count) continue; if (!params->no_irq) trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].irq[data->entries]); if (!params->no_thread) trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].thread[data->entries]); if (params->user_hist) trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].user[data->entries]); } trace_seq_printf(trace->seq, "\n"); trace_seq_do_printf(trace->seq); trace_seq_reset(trace->seq); timerlat_print_summary(params, trace, data); } /* * timerlat_hist_usage - prints timerlat top usage message */ static void timerlat_hist_usage(char *usage) { int i; char *msg[] = { "", " usage: [rtla] timerlat hist [-h] [-q] [-d s] [-D] [-n] [-a us] [-p us] [-i us] [-T us] [-s us] \\", " [-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\", " [-P priority] [-E N] [-b N] [--no-irq] [--no-thread] [--no-header] [--no-summary] \\", " [--no-index] [--with-zeros] [--dma-latency us] [-C[=cgroup_name]] [--no-aa] [--dump-task] [-u]", "", " -h/--help: print this menu", " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit", " -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[m|h|d]: duration of the session in seconds", " --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)", " -D/--debug: print debug info", " -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 <filter>: enable a trace event filter to the previous -e event", " --trigger <trigger>: 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", " -b/--bucket-size N: set the histogram bucket size (default 1)", " -E/--entries N: set the number of entries of the histogram (default 256)", " --no-irq: ignore IRQ latencies", " --no-thread: ignore thread latencies", " --no-header: do not print header", " --no-summary: do not print summary", " --no-index: do not print index", " --with-zeros: print zero only entries", " --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 in-kernel timerlat threads", NULL, }; if (usage) fprintf(stderr, "%s\n", usage); fprintf(stderr, "rtla timerlat hist: a per-cpu histogram of the timer latency (version %s)\n", VERSION); for (i = 0; msg[i]; i++) fprintf(stderr, "%s\n", msg[i]); exit(1); } /* * timerlat_hist_parse_args - allocs, parse and fill the cmd line parameters */ static struct timerlat_hist_params *timerlat_hist_parse_args(int argc, char *argv[]) { struct timerlat_hist_params *params; struct trace_events *tevent; int auto_thresh; int retval; int c; params = calloc(1, sizeof(*params)); if (!params) exit(1); /* disabled by default */ params->dma_latency = -1; /* display data in microseconds */ params->output_divisor = 1000; params->bucket_size = 1; params->entries = 256; while (1) { static struct option long_options[] = { {"auto", required_argument, 0, 'a'}, {"cpus", required_argument, 0, 'c'}, {"cgroup", optional_argument, 0, 'C'}, {"bucket-size", required_argument, 0, 'b'}, {"debug", no_argument, 0, 'D'}, {"entries", required_argument, 0, 'E'}, {"duration", required_argument, 0, 'd'}, {"house-keeping", required_argument, 0, 'H'}, {"help", no_argument, 0, 'h'}, {"irq", required_argument, 0, 'i'}, {"nano", no_argument, 0, 'n'}, {"period", required_argument, 0, 'p'}, {"priority", required_argument, 0, 'P'}, {"stack", required_argument, 0, 's'}, {"thread", required_argument, 0, 'T'}, {"trace", optional_argument, 0, 't'}, {"user-threads", no_argument, 0, 'u'}, {"event", required_argument, 0, 'e'}, {"no-irq", no_argument, 0, '0'}, {"no-thread", no_argument, 0, '1'}, {"no-header", no_argument, 0, '2'}, {"no-summary", no_argument, 0, '3'}, {"no-index", no_argument, 0, '4'}, {"with-zeros", no_argument, 0, '5'}, {"trigger", required_argument, 0, '6'}, {"filter", required_argument, 0, '7'}, {"dma-latency", required_argument, 0, '8'}, {"no-aa", no_argument, 0, '9'}, {"dump-task", no_argument, 0, '\1'}, {0, 0, 0, 0} }; /* getopt_long stores the option index here. */ int option_index = 0; c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:i:np:P:s:t::T:u0123456:7:8:9\1", 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 'c': retval = parse_cpu_set(optarg, ¶ms->monitored_cpus); if (retval) timerlat_hist_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 'b': params->bucket_size = get_llong_from_str(optarg); if ((params->bucket_size == 0) || (params->bucket_size >= 1000000)) timerlat_hist_usage("Bucket size needs to be > 0 and <= 1000000\n"); break; case 'D': config_debug = 1; break; case 'd': params->duration = parse_seconds_duration(optarg); if (!params->duration) timerlat_hist_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 'E': params->entries = get_llong_from_str(optarg); if ((params->entries < 10) || (params->entries > 9999999)) timerlat_hist_usage("Entries must be > 10 and < 9999999\n"); break; case 'h': case '?': timerlat_hist_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 'n': params->output_divisor = 1; break; case 'p': params->timerlat_period_us = get_llong_from_str(optarg); if (params->timerlat_period_us > 1000000) timerlat_hist_usage("Period longer than 1 s\n"); break; case 'P': retval = parse_prio(optarg, ¶ms->sched_param); if (retval == -1) timerlat_hist_usage("Invalid -P priority"); params->set_sched = 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) /* skip = */ params->trace_output = &optarg[1]; else params->trace_output = "timerlat_trace.txt"; break; case 'u': params->user_hist = 1; break; case '0': /* no irq */ params->no_irq = 1; break; case '1': /* no thread */ params->no_thread = 1; break; case '2': /* no header */ params->no_header = 1; break; case '3': /* no summary */ params->no_summary = 1; break; case '4': /* no index */ params->no_index = 1; break; case '5': /* with zeros */ params->with_zeros = 1; break; case '6': /* 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_hist_usage("--trigger requires a previous -e\n"); } break; case '7': /* 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_hist_usage("--filter requires a previous -e\n"); } break; case '8': 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 '9': params->no_aa = 1; break; case '\1': params->dump_tasks = 1; break; default: timerlat_hist_usage("Invalid option"); } } if (geteuid()) { err_msg("rtla needs root permission\n"); exit(EXIT_FAILURE); } if (params->no_irq && params->no_thread) timerlat_hist_usage("no-irq and no-thread set, there is nothing to do here"); if (params->no_index && !params->with_zeros) timerlat_hist_usage("no-index set with with-zeros is not set - it does not make sense"); /* * Auto analysis only happens if stop tracing, thus: */ if (!params->stop_us && !params->stop_total_us) params->no_aa = 1; return params; } /* * timerlat_hist_apply_config - apply the hist configs to the initialized tool */ static int timerlat_hist_apply_config(struct osnoise_tool *tool, struct timerlat_hist_params *params) { int retval, i; if (!params->sleep_time) params->sleep_time = 1; if (params->cpus) { retval = osnoise_set_cpus(tool->context, params->cpus); if (retval) { err_msg("Failed to apply CPUs config\n"); goto out_err; } } else { for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++) CPU_SET(i, ¶ms->monitored_cpus); } if (params->stop_us) { retval = osnoise_set_stop_us(tool->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(tool->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(tool->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(tool->context, params->print_stack); if (retval) { err_msg("Failed to set print stack\n"); goto out_err; } } if (params->hk_cpus) { retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set), ¶ms->hk_cpu_set); if (retval == -1) { err_msg("Failed to set rtla to the house keeping CPUs\n"); goto out_err; } } else if (params->cpus) { /* * Even if the user do not set a house-keeping CPU, try to * move rtla to a CPU set different to the one where the user * set the workload to run. * * No need to check results as this is an automatic attempt. */ auto_house_keeping(¶ms->monitored_cpus); } if (params->user_hist) { retval = osnoise_set_workload(tool->context, 0); if (retval) { err_msg("Failed to set OSNOISE_WORKLOAD option\n"); goto out_err; } } return 0; out_err: return -1; } /* * timerlat_init_hist - initialize a timerlat hist tool with parameters */ static struct osnoise_tool *timerlat_init_hist(struct timerlat_hist_params *params) { struct osnoise_tool *tool; int nr_cpus; nr_cpus = sysconf(_SC_NPROCESSORS_CONF); tool = osnoise_init_tool("timerlat_hist"); if (!tool) return NULL; tool->data = timerlat_alloc_histogram(nr_cpus, params->entries, params->bucket_size); if (!tool->data) goto out_err; tool->params = params; tep_register_event_handler(tool->trace.tep, -1, "ftrace", "timerlat", timerlat_hist_handler, tool); return tool; out_err: osnoise_destroy_tool(tool); return NULL; } static int stop_tracing; static void stop_hist(int sig) { stop_tracing = 1; } /* * timerlat_hist_set_signals - handles the signal to stop the tool */ static void timerlat_hist_set_signals(struct timerlat_hist_params *params) { signal(SIGINT, stop_hist); if (params->duration) { signal(SIGALRM, stop_hist); alarm(params->duration); } } int timerlat_hist_main(int argc, char *argv[]) { struct timerlat_hist_params *params; struct osnoise_tool *record = NULL; struct timerlat_u_params params_u; struct osnoise_tool *tool = NULL; struct osnoise_tool *aa = NULL; struct trace_instance *trace; int dma_latency_fd = -1; int return_value = 1; pthread_t timerlat_u; int retval; params = timerlat_hist_parse_args(argc, argv); if (!params) exit(1); tool = timerlat_init_hist(params); if (!tool) { err_msg("Could not init osnoise hist\n"); goto out_exit; } retval = timerlat_hist_apply_config(tool, params); if (retval) { err_msg("Could not apply config\n"); goto out_free; } trace = &tool->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->cgroup && !params->user_hist) { 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->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_hist; } } if (!params->no_aa) { aa = osnoise_init_tool("timerlat_aa"); if (!aa) goto out_hist; retval = timerlat_aa_init(aa, params->dump_tasks); if (retval) { err_msg("Failed to enable the auto analysis instance\n"); goto out_hist; } retval = enable_timerlat(&aa->trace); if (retval) { err_msg("Failed to enable timerlat tracer\n"); goto out_hist; } } /* * 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); trace_instance_start(trace); tool->start_time = time(NULL); timerlat_hist_set_signals(params); if (params->user_hist) { /* 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"); } while (!stop_tracing) { sleep(params->sleep_time); 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_hist; } if (trace_is_off(&tool->trace, &record->trace)) break; /* is there still any user-threads ? */ if (params->user_hist) { if (params_u.stopped_running) { debug_msg("timerlat user-space threads stopped!\n"); break; } } } if (params->user_hist && !params_u.stopped_running) { params_u.should_run = 0; sleep(1); } timerlat_print_stats(params, tool); return_value = 0; if (trace_is_off(&tool->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); } } out_hist: timerlat_aa_destroy(); if (dma_latency_fd >= 0) close(dma_latency_fd); trace_events_destroy(&record->trace, params->events); params->events = NULL; out_free: timerlat_free_histogram(tool->data); osnoise_destroy_tool(aa); osnoise_destroy_tool(record); osnoise_destroy_tool(tool); free(params); out_exit: exit(return_value); } |