// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <[email protected]>
*/
#define _GNU_SOURCE
#include <getopt.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <time.h>
#include <sched.h>
#include "utils.h"
#include "osnoise.h"
struct osnoise_hist_params {
char *cpus;
cpu_set_t monitored_cpus;
char *trace_output;
char *cgroup_name;
unsigned long long runtime;
unsigned long long period;
long long threshold;
long long stop_us;
long long stop_total_us;
int sleep_time;
int duration;
int set_sched;
int output_divisor;
int cgroup;
int hk_cpus;
cpu_set_t hk_cpu_set;
struct sched_attr sched_param;
struct trace_events *events;
char no_header;
char no_summary;
char no_index;
char with_zeros;
int bucket_size;
int entries;
int warmup;
int buffer_size;
};
struct osnoise_hist_cpu {
int *samples;
int count;
unsigned long long min_sample;
unsigned long long sum_sample;
unsigned long long max_sample;
};
struct osnoise_hist_data {
struct tracefs_hist *trace_hist;
struct osnoise_hist_cpu *hist;
int entries;
int bucket_size;
int nr_cpus;
};
/*
* osnoise_free_histogram - free runtime data
*/
static void
osnoise_free_histogram(struct osnoise_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].samples)
free(data->hist[cpu].samples);
}
/* one set of histograms per CPU */
if (data->hist)
free(data->hist);
free(data);
}
/*
* osnoise_alloc_histogram - alloc runtime data
*/
static struct osnoise_hist_data
*osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size)
{
struct osnoise_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;
data->hist = calloc(1, sizeof(*data->hist) * nr_cpus);
if (!data->hist)
goto cleanup;
for (cpu = 0; cpu < nr_cpus; cpu++) {
data->hist[cpu].samples = calloc(1, sizeof(*data->hist->samples) * (entries + 1));
if (!data->hist[cpu].samples)
goto cleanup;
}
/* set the min to max */
for (cpu = 0; cpu < nr_cpus; cpu++)
data->hist[cpu].min_sample = ~0;
return data;
cleanup:
osnoise_free_histogram(data);
return NULL;
}
static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu,
unsigned long long duration, int count)
{
struct osnoise_hist_params *params = tool->params;
struct osnoise_hist_data *data = tool->data;
unsigned long long total_duration;
int entries = data->entries;
int bucket;
int *hist;
if (params->output_divisor)
duration = duration / params->output_divisor;
bucket = duration / data->bucket_size;
total_duration = duration * count;
hist = data->hist[cpu].samples;
data->hist[cpu].count += count;
update_min(&data->hist[cpu].min_sample, &duration);
update_sum(&data->hist[cpu].sum_sample, &total_duration);
update_max(&data->hist[cpu].max_sample, &duration);
if (bucket < entries)
hist[bucket] += count;
else
hist[entries] += count;
}
/*
* osnoise_destroy_trace_hist - disable events used to collect histogram
*/
static void osnoise_destroy_trace_hist(struct osnoise_tool *tool)
{
struct osnoise_hist_data *data = tool->data;
tracefs_hist_pause(tool->trace.inst, data->trace_hist);
tracefs_hist_destroy(tool->trace.inst, data->trace_hist);
}
/*
* osnoise_init_trace_hist - enable events used to collect histogram
*/
static int osnoise_init_trace_hist(struct osnoise_tool *tool)
{
struct osnoise_hist_params *params = tool->params;
struct osnoise_hist_data *data = tool->data;
int bucket_size;
char buff[128];
int retval = 0;
/*
* Set the size of the bucket.
*/
bucket_size = params->output_divisor * params->bucket_size;
snprintf(buff, sizeof(buff), "duration.buckets=%d", bucket_size);
data->trace_hist = tracefs_hist_alloc(tool->trace.tep, "osnoise", "sample_threshold",
buff, TRACEFS_HIST_KEY_NORMAL);
if (!data->trace_hist)
return 1;
retval = tracefs_hist_add_key(data->trace_hist, "cpu", 0);
if (retval)
goto out_err;
retval = tracefs_hist_start(tool->trace.inst, data->trace_hist);
if (retval)
goto out_err;
return 0;
out_err:
osnoise_destroy_trace_hist(tool);
return 1;
}
/*
* osnoise_read_trace_hist - parse histogram file and file osnoise histogram
*/
static void osnoise_read_trace_hist(struct osnoise_tool *tool)
{
struct osnoise_hist_data *data = tool->data;
long long cpu, counter, duration;
char *content, *position;
tracefs_hist_pause(tool->trace.inst, data->trace_hist);
content = tracefs_event_file_read(tool->trace.inst, "osnoise",
"sample_threshold",
"hist", NULL);
if (!content)
return;
position = content;
while (true) {
position = strstr(position, "duration: ~");
if (!position)
break;
position += strlen("duration: ~");
duration = get_llong_from_str(position);
if (duration == -1)
err_msg("error reading duration from histogram\n");
position = strstr(position, "cpu:");
if (!position)
break;
position += strlen("cpu: ");
cpu = get_llong_from_str(position);
if (cpu == -1)
err_msg("error reading cpu from histogram\n");
position = strstr(position, "hitcount:");
if (!position)
break;
position += strlen("hitcount: ");
counter = get_llong_from_str(position);
if (counter == -1)
err_msg("error reading counter from histogram\n");
osnoise_hist_update_multiple(tool, cpu, duration, counter);
}
free(content);
}
/*
* osnoise_hist_header - print the header of the tracer to the output
*/
static void osnoise_hist_header(struct osnoise_tool *tool)
{
struct osnoise_hist_params *params = tool->params;
struct osnoise_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 osnoise 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].count)
continue;
trace_seq_printf(s, " CPU-%03d", cpu);
}
trace_seq_printf(s, "\n");
trace_seq_do_printf(s);
trace_seq_reset(s);
}
/*
* osnoise_print_summary - print the summary of the hist data to the output
*/
static void
osnoise_print_summary(struct osnoise_hist_params *params,
struct trace_instance *trace,
struct osnoise_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].count)
continue;
trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].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].count)
continue;
trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].min_sample);
}
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].count)
continue;
if (data->hist[cpu].count)
trace_seq_printf(trace->seq, "%9.2f ",
((double) data->hist[cpu].sum_sample) / data->hist[cpu].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].count)
continue;
trace_seq_printf(trace->seq, "%9llu ", data->hist[cpu].max_sample);
}
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
}
/*
* osnoise_print_stats - print data for all CPUs
*/
static void
osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *tool)
{
struct osnoise_hist_data *data = tool->data;
struct trace_instance *trace = &tool->trace;
int has_samples = 0;
int bucket, cpu;
int total;
osnoise_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].count)
continue;
total += data->hist[cpu].samples[bucket];
trace_seq_printf(trace->seq, "%9d ", data->hist[cpu].samples[bucket]);
}
if (total == 0 && !params->with_zeros) {
trace_seq_reset(trace->seq);
continue;
}
/* There are samples above the threshold */
has_samples = 1;
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
}
/*
* If no samples were recorded, skip calculations, print zeroed statistics
* and return.
*/
if (!has_samples) {
trace_seq_reset(trace->seq);
trace_seq_printf(trace->seq, "over: 0\ncount: 0\nmin: 0\navg: 0\nmax: 0\n");
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
return;
}
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].count)
continue;
trace_seq_printf(trace->seq, "%9d ",
data->hist[cpu].samples[data->entries]);
}
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);
trace_seq_reset(trace->seq);
osnoise_print_summary(params, trace, data);
}
/*
* osnoise_hist_usage - prints osnoise hist usage message
*/
static void osnoise_hist_usage(char *usage)
{
int i;
static const char * const msg[] = {
"",
" usage: rtla osnoise hist [-h] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
" [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
" [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\",
" [--no-index] [--with-zeros] [-C[=cgroup_name]] [--warm-up]",
"",
" -h/--help: print this menu",
" -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
" -p/--period us: osnoise period in us",
" -r/--runtime us: osnoise runtime in us",
" -s/--stop us: stop trace if a single sample is higher than the argument in us",
" -S/--stop-total us: stop trace if the total sample is higher than the argument in us",
" -T/--threshold us: the minimum delta to be considered a noise",
" -c/--cpus cpu-list: list of cpus to run osnoise threads",
" -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",
" -t/--trace[file]: save the stopped trace to [file|osnoise_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",
" -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-header: do not print header",
" --no-summary: do not print summary",
" --no-index: do not print index",
" --with-zeros: print zero only entries",
" -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",
" --warm-up: let the workload run for s seconds before collecting data",
" --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
NULL,
};
if (usage)
fprintf(stderr, "%s\n", usage);
fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n",
VERSION);
for (i = 0; msg[i]; i++)
fprintf(stderr, "%s\n", msg[i]);
if (usage)
exit(EXIT_FAILURE);
exit(EXIT_SUCCESS);
}
/*
* osnoise_hist_parse_args - allocs, parse and fill the cmd line parameters
*/
static struct osnoise_hist_params
*osnoise_hist_parse_args(int argc, char *argv[])
{
struct osnoise_hist_params *params;
struct trace_events *tevent;
int retval;
int c;
params = calloc(1, sizeof(*params));
if (!params)
exit(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'},
{"bucket-size", required_argument, 0, 'b'},
{"entries", required_argument, 0, 'E'},
{"cpus", required_argument, 0, 'c'},
{"cgroup", optional_argument, 0, 'C'},
{"debug", no_argument, 0, 'D'},
{"duration", required_argument, 0, 'd'},
{"house-keeping", required_argument, 0, 'H'},
{"help", no_argument, 0, 'h'},
{"period", required_argument, 0, 'p'},
{"priority", required_argument, 0, 'P'},
{"runtime", required_argument, 0, 'r'},
{"stop", required_argument, 0, 's'},
{"stop-total", required_argument, 0, 'S'},
{"trace", optional_argument, 0, 't'},
{"event", required_argument, 0, 'e'},
{"threshold", required_argument, 0, 'T'},
{"no-header", no_argument, 0, '0'},
{"no-summary", no_argument, 0, '1'},
{"no-index", no_argument, 0, '2'},
{"with-zeros", no_argument, 0, '3'},
{"trigger", required_argument, 0, '4'},
{"filter", required_argument, 0, '5'},
{"warm-up", required_argument, 0, '6'},
{"trace-buffer-size", required_argument, 0, '7'},
{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:p:P:r:s:S:t::T:01234:5:6:7:",
long_options, &option_index);
/* detect the end of the options. */
if (c == -1)
break;
switch (c) {
case 'a':
/* set sample stop to auto_thresh */
params->stop_us = get_llong_from_str(optarg);
/* set sample threshold to 1 */
params->threshold = 1;
/* set trace */
params->trace_output = "osnoise_trace.txt";
break;
case 'b':
params->bucket_size = get_llong_from_str(optarg);
if ((params->bucket_size == 0) || (params->bucket_size >= 1000000))
osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
break;
case 'c':
retval = parse_cpu_set(optarg, ¶ms->monitored_cpus);
if (retval)
osnoise_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 'D':
config_debug = 1;
break;
case 'd':
params->duration = parse_seconds_duration(optarg);
if (!params->duration)
osnoise_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))
osnoise_hist_usage("Entries must be > 10 and < 9999999\n");
break;
case 'h':
case '?':
osnoise_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 'p':
params->period = get_llong_from_str(optarg);
if (params->period > 10000000)
osnoise_hist_usage("Period longer than 10 s\n");
break;
case 'P':
retval = parse_prio(optarg, ¶ms->sched_param);
if (retval == -1)
osnoise_hist_usage("Invalid -P priority");
params->set_sched = 1;
break;
case 'r':
params->runtime = get_llong_from_str(optarg);
if (params->runtime < 100)
osnoise_hist_usage("Runtime shorter than 100 us\n");
break;
case 's':
params->stop_us = get_llong_from_str(optarg);
break;
case 'S':
params->stop_total_us = get_llong_from_str(optarg);
break;
case 'T':
params->threshold = 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] != '0')
params->trace_output = argv[optind];
else
params->trace_output = "osnoise_trace.txt";
break;
case '0': /* no header */
params->no_header = 1;
break;
case '1': /* no summary */
params->no_summary = 1;
break;
case '2': /* no index */
params->no_index = 1;
break;
case '3': /* with zeros */
params->with_zeros = 1;
break;
case '4': /* 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 {
osnoise_hist_usage("--trigger requires a previous -e\n");
}
break;
case '5': /* 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 {
osnoise_hist_usage("--filter requires a previous -e\n");
}
break;
case '6':
params->warmup = get_llong_from_str(optarg);
break;
case '7':
params->buffer_size = get_llong_from_str(optarg);
break;
default:
osnoise_hist_usage("Invalid option");
}
}
if (geteuid()) {
err_msg("rtla needs root permission\n");
exit(EXIT_FAILURE);
}
if (params->no_index && !params->with_zeros)
osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense");
return params;
}
/*
* osnoise_hist_apply_config - apply the hist configs to the initialized tool
*/
static int
osnoise_hist_apply_config(struct osnoise_tool *tool, struct osnoise_hist_params *params)
{
int retval;
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;
}
}
if (params->runtime || params->period) {
retval = osnoise_set_runtime_period(tool->context,
params->runtime,
params->period);
if (retval) {
err_msg("Failed to set runtime and/or period\n");
goto out_err;
}
}
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->threshold) {
retval = osnoise_set_tracing_thresh(tool->context, params->threshold);
if (retval) {
err_msg("Failed to set tracing_thresh\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);
}
return 0;
out_err:
return -1;
}
/*
* osnoise_init_hist - initialize a osnoise hist tool with parameters
*/
static struct osnoise_tool
*osnoise_init_hist(struct osnoise_hist_params *params)
{
struct osnoise_tool *tool;
int nr_cpus;
nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
tool = osnoise_init_tool("osnoise_hist");
if (!tool)
return NULL;
tool->data = osnoise_alloc_histogram(nr_cpus, params->entries, params->bucket_size);
if (!tool->data)
goto out_err;
tool->params = params;
return tool;
out_err:
osnoise_destroy_tool(tool);
return NULL;
}
static int stop_tracing;
static void stop_hist(int sig)
{
stop_tracing = 1;
}
/*
* osnoise_hist_set_signals - handles the signal to stop the tool
*/
static void
osnoise_hist_set_signals(struct osnoise_hist_params *params)
{
signal(SIGINT, stop_hist);
if (params->duration) {
signal(SIGALRM, stop_hist);
alarm(params->duration);
}
}
int osnoise_hist_main(int argc, char *argv[])
{
struct osnoise_hist_params *params;
struct osnoise_tool *record = NULL;
struct osnoise_tool *tool = NULL;
struct trace_instance *trace;
int return_value = 1;
int retval;
params = osnoise_hist_parse_args(argc, argv);
if (!params)
exit(1);
tool = osnoise_init_hist(params);
if (!tool) {
err_msg("Could not init osnoise hist\n");
goto out_exit;
}
retval = osnoise_hist_apply_config(tool, params);
if (retval) {
err_msg("Could not apply config\n");
goto out_destroy;
}
trace = &tool->trace;
retval = enable_osnoise(trace);
if (retval) {
err_msg("Failed to enable osnoise tracer\n");
goto out_destroy;
}
retval = osnoise_init_trace_hist(tool);
if (retval)
goto out_destroy;
if (params->set_sched) {
retval = set_comm_sched_attr("osnoise/", ¶ms->sched_param);
if (retval) {
err_msg("Failed to set sched parameters\n");
goto out_free;
}
}
if (params->cgroup) {
retval = set_comm_cgroup("timerlat/", params->cgroup_name);
if (!retval) {
err_msg("Failed to move threads to cgroup\n");
goto out_free;
}
}
if (params->trace_output) {
record = osnoise_init_trace_tool("osnoise");
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->buffer_size > 0) {
retval = trace_set_buffer_size(&record->trace, params->buffer_size);
if (retval)
goto out_hist;
}
}
/*
* Start the tracer 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);
trace_instance_start(trace);
if (params->warmup > 0) {
debug_msg("Warming up for %d seconds\n", params->warmup);
sleep(params->warmup);
if (stop_tracing)
goto out_hist;
/*
* Clean up the buffer. The osnoise workload do not run
* with tracing off to avoid creating a performance penalty
* when not needed.
*/
retval = tracefs_instance_file_write(trace->inst, "trace", "");
if (retval < 0) {
debug_msg("Error cleaning up the buffer");
goto out_hist;
}
}
tool->start_time = time(NULL);
osnoise_hist_set_signals(params);
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;
}
osnoise_read_trace_hist(tool);
osnoise_print_stats(params, tool);
return_value = 0;
if (trace_is_off(&tool->trace, &record->trace)) {
printf("rtla osnoise hit stop tracing\n");
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:
trace_events_destroy(&record->trace, params->events);
params->events = NULL;
out_free:
osnoise_free_histogram(tool->data);
out_destroy:
osnoise_destroy_tool(record);
osnoise_destroy_tool(tool);
free(params);
out_exit:
exit(return_value);
}
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