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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sched.h>
#include "timerlat.h"
#define DEFAULT_TIMERLAT_PERIOD 1000 /* 1ms */
/*
* timerlat_apply_config - apply common configs to the initialized tool
*/
int
timerlat_apply_config(struct osnoise_tool *tool, struct timerlat_params *params)
{
int retval, i;
if (!params->sleep_time)
params->sleep_time = 1;
retval = osnoise_set_cpus(tool->context, params->cpus ? params->cpus : "all");
if (retval) {
err_msg("Failed to apply CPUs config\n");
goto out_err;
}
if (!params->cpus) {
for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++)
CPU_SET(i, ¶ms->monitored_cpus);
}
retval = osnoise_set_stop_us(tool->context, params->stop_us);
if (retval) {
err_msg("Failed to set stop us\n");
goto out_err;
}
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;
}
retval = osnoise_set_timerlat_period_us(tool->context,
params->timerlat_period_us ?
params->timerlat_period_us :
DEFAULT_TIMERLAT_PERIOD);
if (retval) {
err_msg("Failed to set timerlat period\n");
goto out_err;
}
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 the user did not specify a type of thread, try user-threads first.
* Fall back to kernel threads otherwise.
*/
if (!params->kernel_workload && !params->user_data) {
retval = tracefs_file_exists(NULL, "osnoise/per_cpu/cpu0/timerlat_fd");
if (retval) {
debug_msg("User-space interface detected, setting user-threads\n");
params->user_workload = 1;
params->user_data = 1;
} else {
debug_msg("User-space interface not detected, setting kernel-threads\n");
params->kernel_workload = 1;
}
}
/*
* Set workload according to type of thread if the kernel supports it.
* On kernels without support, user threads will have already failed
* on missing timerlat_fd, and kernel threads do not need it.
*/
retval = osnoise_set_workload(tool->context, params->kernel_workload);
if (retval < -1) {
err_msg("Failed to set OSNOISE_WORKLOAD option\n");
goto out_err;
}
return 0;
out_err:
return -1;
}
static void timerlat_usage(int err)
{
int i;
static const char * const msg[] = {
"",
"timerlat version " VERSION,
"",
" usage: [rtla] timerlat [MODE] ...",
"",
" modes:",
" top - prints the summary from timerlat tracer",
" hist - prints a histogram of timer latencies",
"",
"if no MODE is given, the top mode is called, passing the arguments",
NULL,
};
for (i = 0; msg[i]; i++)
fprintf(stderr, "%s\n", msg[i]);
exit(err);
}
int timerlat_main(int argc, char *argv[])
{
if (argc == 0)
goto usage;
/*
* if timerlat was called without any argument, run the
* default cmdline.
*/
if (argc == 1) {
timerlat_top_main(argc, argv);
exit(0);
}
if ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0)) {
timerlat_usage(0);
} else if (strncmp(argv[1], "-", 1) == 0) {
/* the user skipped the tool, call the default one */
timerlat_top_main(argc, argv);
exit(0);
} else if (strcmp(argv[1], "top") == 0) {
timerlat_top_main(argc-1, &argv[1]);
exit(0);
} else if (strcmp(argv[1], "hist") == 0) {
timerlat_hist_main(argc-1, &argv[1]);
exit(0);
}
usage:
timerlat_usage(1);
exit(1);
}
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