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path: root/tools/tracing/rtla/src/timerlat_top.c
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Diffstat (limited to 'tools/tracing/rtla/src/timerlat_top.c')
-rw-r--r--tools/tracing/rtla/src/timerlat_top.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index a19cbc2aa1f4..5395d1c5921e 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_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>
@@ -11,6 +12,7 @@
#include <stdio.h>
#include <time.h>
#include <errno.h>
+#include <sched.h>
#include "utils.h"
#include "osnoise.h"
@@ -37,6 +39,8 @@ struct timerlat_top_params {
int aa_only;
int dump_tasks;
int cgroup;
+ int hk_cpus;
+ cpu_set_t hk_cpu_set;
struct sched_attr sched_param;
struct trace_events *events;
};
@@ -286,7 +290,7 @@ static void timerlat_top_usage(char *usage)
static const char *const msg[] = {
"",
" usage: rtla timerlat [top] [-h] [-q] [-a us] [-d s] [-D] [-n] [-p us] [-i us] [-T us] [-s us] \\",
- " [[-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] \\",
+ " [[-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
" [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]]",
"",
" -h/--help: print this menu",
@@ -297,6 +301,7 @@ static void timerlat_top_usage(char *usage)
" -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",
" -D/--debug: print debug info",
@@ -360,6 +365,7 @@ static struct timerlat_top_params
{"duration", required_argument, 0, 'd'},
{"event", required_argument, 0, 'e'},
{"help", no_argument, 0, 'h'},
+ {"house-keeping", required_argument, 0, 'H'},
{"irq", required_argument, 0, 'i'},
{"nano", no_argument, 0, 'n'},
{"period", required_argument, 0, 'p'},
@@ -380,7 +386,7 @@ static struct timerlat_top_params
/* getopt_long stores the option index here. */
int option_index = 0;
- c = getopt_long(argc, argv, "a:c:C::d:De:hi:np:P:qs:t::T:0:1:2:345:",
+ c = getopt_long(argc, argv, "a:c:C::d:De:hH:i:np:P:qs:t::T:0:1:2:345:",
long_options, &option_index);
/* detect the end of the options. */
@@ -454,6 +460,14 @@ static struct timerlat_top_params
case '?':
timerlat_top_usage(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 'i':
params->stop_us = get_llong_from_str(optarg);
break;
@@ -598,6 +612,15 @@ timerlat_top_apply_config(struct osnoise_tool *top, struct timerlat_top_params *
}
}
+ 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;
+ }
+ }
+
return 0;
out_err: