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path: root/tools/tracing/rtla/src/osnoise_top.c
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Diffstat (limited to 'tools/tracing/rtla/src/osnoise_top.c')
-rw-r--r--tools/tracing/rtla/src/osnoise_top.c83
1 files changed, 75 insertions, 8 deletions
diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 562f2e4b18c5..f7c959be8677 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -3,6 +3,7 @@
* 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>
@@ -10,6 +11,7 @@
#include <unistd.h>
#include <stdio.h>
#include <time.h>
+#include <sched.h>
#include "osnoise.h"
#include "utils.h"
@@ -24,8 +26,9 @@ enum osnoise_mode {
*/
struct osnoise_top_params {
char *cpus;
- char *monitored_cpus;
+ cpu_set_t monitored_cpus;
char *trace_output;
+ char *cgroup_name;
unsigned long long runtime;
unsigned long long period;
long long threshold;
@@ -35,6 +38,9 @@ struct osnoise_top_params {
int duration;
int quiet;
int set_sched;
+ int cgroup;
+ int hk_cpus;
+ cpu_set_t hk_cpu_set;
struct sched_attr sched_param;
struct trace_events *events;
enum osnoise_mode mode;
@@ -257,7 +263,7 @@ osnoise_print_stats(struct osnoise_top_params *params, struct osnoise_tool *top)
osnoise_top_header(top);
for (i = 0; i < nr_cpus; i++) {
- if (params->cpus && !params->monitored_cpus[i])
+ if (params->cpus && !CPU_ISSET(i, &params->monitored_cpus))
continue;
osnoise_top_print(top, i);
}
@@ -276,7 +282,7 @@ static void osnoise_top_usage(struct osnoise_top_params *params, char *usage)
static const char * const msg[] = {
" [-h] [-q] [-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] [-P priority]",
+ " [-c cpu-list] [-H cpu-list] [-P priority] [-C[=cgroup_name]]",
"",
" -h/--help: print this menu",
" -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
@@ -286,6 +292,8 @@ static void osnoise_top_usage(struct osnoise_top_params *params, char *usage)
" -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]",
@@ -340,16 +348,24 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
if (!params)
exit(1);
- if (strcmp(argv[0], "hwnoise") == 0)
+ if (strcmp(argv[0], "hwnoise") == 0) {
params->mode = MODE_HWNOISE;
+ /*
+ * Reduce CPU usage for 75% to avoid killing the system.
+ */
+ params->runtime = 750000;
+ params->period = 1000000;
+ }
while (1) {
static struct option long_options[] = {
{"auto", required_argument, 0, 'a'},
{"cpus", required_argument, 0, 'c'},
+ {"cgroup", optional_argument, 0, 'C'},
{"debug", no_argument, 0, 'D'},
{"duration", required_argument, 0, 'd'},
{"event", required_argument, 0, 'e'},
+ {"house-keeping", required_argument, 0, 'H'},
{"help", no_argument, 0, 'h'},
{"period", required_argument, 0, 'p'},
{"priority", required_argument, 0, 'P'},
@@ -367,7 +383,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
/* getopt_long stores the option index here. */
int option_index = 0;
- c = getopt_long(argc, argv, "a:c:d:De:hp:P:qr:s:S:t::T:0:1:",
+ c = getopt_long(argc, argv, "a:c:C::d:De:hH:p:P:qr:s:S:t::T:0:1:",
long_options, &option_index);
/* Detect the end of the options. */
@@ -387,11 +403,21 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
break;
case 'c':
- retval = parse_cpu_list(optarg, &params->monitored_cpus);
+ retval = parse_cpu_set(optarg, &params->monitored_cpus);
if (retval)
osnoise_top_usage(params, "\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;
@@ -416,6 +442,14 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
case '?':
osnoise_top_usage(params, NULL);
break;
+ case 'H':
+ params->hk_cpus = 1;
+ retval = parse_cpu_set(optarg, &params->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)
@@ -547,6 +581,24 @@ osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *p
}
}
+ if (params->hk_cpus) {
+ retval = sched_setaffinity(getpid(), sizeof(params->hk_cpu_set),
+ &params->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(&params->monitored_cpus);
+ }
+
return 0;
out_err:
@@ -643,7 +695,13 @@ int osnoise_top_main(int argc, char **argv)
}
}
- trace_instance_start(trace);
+ if (params->cgroup) {
+ retval = set_comm_cgroup("osnoise/", 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");
@@ -657,9 +715,18 @@ int osnoise_top_main(int argc, char **argv)
if (retval)
goto out_top;
}
+ }
+ /*
+ * 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);
tool->start_time = time(NULL);
osnoise_top_set_signals(params);
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-15 01:09:01 +0300