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Message-Id: <20230612230600.7e009782e8365cd5f1bce444@kernel.org>
Date: Mon, 12 Jun 2023 23:06:00 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
Steven Rostedt <rostedt@...dmis.org>,
linux-doc@...r.kernel.org, Juri Lelli <juri.lelli@...hat.com>,
William White <chwhite@...hat.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH V3 02/11] rtla: Add --house-keeping option
On Tue, 6 Jun 2023 18:12:16 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:
> To avoid having rtla interfering with the measurement threads, add an
> option for the user to set the CPUs in which rtla should run. For
> instance:
>
> # rtla timerlat top -H 0 -C 1-7
Isn't it '-c 1-7' instead of '-C', because -C is for cgroup name?
Thanks,
>
> Will place rtla in the CPU 0, while running the measurement threads in
> the CPU 1-7.
>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Jonathan Corbet <corbet@....net>
> Suggested-by: Juri Lelli <juri.lelli@...hat.com>
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
> Documentation/tools/rtla/common_options.rst | 4 ++
> tools/tracing/rtla/src/osnoise_hist.c | 29 +++++++++--
> tools/tracing/rtla/src/osnoise_top.c | 27 +++++++++-
> tools/tracing/rtla/src/timerlat_hist.c | 27 +++++++++-
> tools/tracing/rtla/src/timerlat_top.c | 27 +++++++++-
> tools/tracing/rtla/src/utils.c | 58 +++++++++++++++++++++
> tools/tracing/rtla/src/utils.h | 3 ++
> 7 files changed, 166 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/tools/rtla/common_options.rst b/Documentation/tools/rtla/common_options.rst
> index ede07359d93c..aeb91ff3bd68 100644
> --- a/Documentation/tools/rtla/common_options.rst
> +++ b/Documentation/tools/rtla/common_options.rst
> @@ -2,6 +2,10 @@
>
> Set the osnoise tracer to run the sample threads in the cpu-list.
>
> +**-H**, **--house-keeping** *cpu-list*
> +
> + Run rtla control threads only on the given cpu-list.
> +
> **-d**, **--duration** *time[s|m|h|d]*
>
> Set the duration of the session.
> diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
> index 076f4c6af3dd..d2b68177ffac 100644
> --- a/tools/tracing/rtla/src/osnoise_hist.c
> +++ b/tools/tracing/rtla/src/osnoise_hist.c
> @@ -3,6 +3,7 @@
> * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@...nel.org>
> */
>
> +#define _GNU_SOURCE
> #include <getopt.h>
> #include <stdlib.h>
> #include <string.h>
> @@ -11,6 +12,7 @@
> #include <errno.h>
> #include <stdio.h>
> #include <time.h>
> +#include <sched.h>
>
> #include "utils.h"
> #include "osnoise.h"
> @@ -30,6 +32,8 @@ struct osnoise_hist_params {
> 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;
>
> @@ -434,8 +438,8 @@ static void osnoise_hist_usage(char *usage)
> "",
> " 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] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] [--no-index] \\",
> - " [--with-zeros] [-C[=cgroup_name]]",
> + " [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\",
> + " [--no-index] [--with-zeros] [-C[=cgroup_name]]",
> "",
> " -h/--help: print this menu",
> " -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
> @@ -445,6 +449,7 @@ static void osnoise_hist_usage(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",
> @@ -507,6 +512,7 @@ static struct osnoise_hist_params
> {"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'},
> @@ -528,7 +534,7 @@ static struct osnoise_hist_params
> /* getopt_long stores the option index here. */
> int option_index = 0;
>
> - c = getopt_long(argc, argv, "a:c:C::b:d:e:E:Dhp:P:r:s:S:t::T:01234:5:",
> + c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:p:P:r:s:S:t::T:01234:5:",
> long_options, &option_index);
>
> /* detect the end of the options. */
> @@ -597,6 +603,14 @@ static struct osnoise_hist_params
> 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)
> @@ -732,6 +746,15 @@ osnoise_hist_apply_config(struct osnoise_tool *tool, struct osnoise_hist_params
> }
> }
>
> + 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;
> + }
> + }
> +
> return 0;
>
> out_err:
> diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
> index 139d8d392540..fcf6c14ce1bc 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@...nel.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"
> @@ -37,6 +39,8 @@ struct osnoise_top_params {
> 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;
> @@ -278,7 +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[=cgroup_name]]",
> + " [-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",
> @@ -288,6 +292,7 @@ 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",
> @@ -354,6 +359,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
> {"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'},
> @@ -371,7 +377,7 @@ 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: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. */
> @@ -430,6 +436,14 @@ 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, ¶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)
> @@ -561,6 +575,15 @@ 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),
> + ¶ms->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:
> diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
> index 459c159923e8..d48c05d238f9 100644
> --- a/tools/tracing/rtla/src/timerlat_hist.c
> +++ b/tools/tracing/rtla/src/timerlat_hist.c
> @@ -3,6 +3,7 @@
> * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@...nel.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 "utils.h"
> #include "osnoise.h"
> @@ -31,6 +33,8 @@ struct timerlat_hist_params {
> int set_sched;
> int dma_latency;
> int cgroup;
> + int hk_cpus;
> + cpu_set_t hk_cpu_set;
> struct sched_attr sched_param;
> struct trace_events *events;
> char no_irq;
> @@ -432,7 +436,7 @@ static void timerlat_hist_usage(char *usage)
> 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] \\",
> + " [-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]]",
> "",
> @@ -443,6 +447,7 @@ static void timerlat_hist_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",
> @@ -513,6 +518,7 @@ static struct timerlat_hist_params
> {"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'},
> @@ -537,7 +543,7 @@ static struct timerlat_hist_params
> /* getopt_long stores the option index here. */
> int option_index = 0;
>
> - c = getopt_long(argc, argv, "a:c:C::b:d:e:E:Dhi:np:P:s:t::T:0123456:7:8:",
> + c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:i:np:P:s:t::T:0123456:7:8:",
> long_options, &option_index);
>
> /* detect the end of the options. */
> @@ -608,6 +614,14 @@ static struct timerlat_hist_params
> 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;
> @@ -755,6 +769,15 @@ timerlat_hist_apply_config(struct osnoise_tool *tool, struct timerlat_hist_param
> }
> }
>
> + 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;
> + }
> + }
> +
> return 0;
>
> out_err:
> 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@...nel.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, ¶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;
> @@ -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),
> + ¶ms->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:
> diff --git a/tools/tracing/rtla/src/utils.c b/tools/tracing/rtla/src/utils.c
> index bcc0a9f39cfe..ee6fab09acae 100644
> --- a/tools/tracing/rtla/src/utils.c
> +++ b/tools/tracing/rtla/src/utils.c
> @@ -3,6 +3,7 @@
> * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@...nel.org>
> */
>
> +#define _GNU_SOURCE
> #include <dirent.h>
> #include <stdarg.h>
> #include <stdlib.h>
> @@ -150,6 +151,63 @@ int parse_cpu_list(char *cpu_list, char **monitored_cpus)
> return 1;
> }
>
> +/*
> + * parse_cpu_set - parse a cpu_list filling cpu_set_t argument
> + *
> + * Receives a cpu list, like 1-3,5 (cpus 1, 2, 3, 5), and then set
> + * filling cpu_set_t argument.
> + *
> + * Returns 1 on success, 0 otherwise.
> + */
> +int parse_cpu_set(char *cpu_list, cpu_set_t *set)
> +{
> + const char *p;
> + int end_cpu;
> + int nr_cpus;
> + int cpu;
> + int i;
> +
> + CPU_ZERO(set);
> +
> + nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
> +
> + for (p = cpu_list; *p; ) {
> + cpu = atoi(p);
> + if (cpu < 0 || (!cpu && *p != '0') || cpu >= nr_cpus)
> + goto err;
> +
> + while (isdigit(*p))
> + p++;
> + if (*p == '-') {
> + p++;
> + end_cpu = atoi(p);
> + if (end_cpu < cpu || (!end_cpu && *p != '0') || end_cpu >= nr_cpus)
> + goto err;
> + while (isdigit(*p))
> + p++;
> + } else
> + end_cpu = cpu;
> +
> + if (cpu == end_cpu) {
> + debug_msg("cpu_set: adding cpu %d\n", cpu);
> + CPU_SET(cpu, set);
> + } else {
> + for (i = cpu; i <= end_cpu; i++) {
> + debug_msg("cpu_set: adding cpu %d\n", i);
> + CPU_SET(i, set);
> + }
> + }
> +
> + if (*p == ',')
> + p++;
> + }
> +
> + return 0;
> +err:
> + debug_msg("Error parsing the cpu set %s\n", cpu_list);
> + return 1;
> +}
> +
> /*
> * parse_duration - parse duration with s/m/h/d suffix converting it to seconds
> */
> diff --git a/tools/tracing/rtla/src/utils.h b/tools/tracing/rtla/src/utils.h
> index 42b6f099d10a..9ab2f0d7bc1c 100644
> --- a/tools/tracing/rtla/src/utils.h
> +++ b/tools/tracing/rtla/src/utils.h
> @@ -1,6 +1,8 @@
> // SPDX-License-Identifier: GPL-2.0
> +
> #include <stdint.h>
> #include <time.h>
> +#include <sched.h>
>
> /*
> * '18446744073709551615\0'
> @@ -54,6 +56,7 @@ struct sched_attr {
> };
>
> int parse_prio(char *arg, struct sched_attr *sched_param);
> +int parse_cpu_set(char *cpu_list, cpu_set_t *set);
> int set_comm_sched_attr(const char *comm_prefix, struct sched_attr *attr);
> int set_comm_cgroup(const char *comm_prefix, const char *cgroup);
> int set_cpu_dma_latency(int32_t latency);
> --
> 2.38.1
>
--
Masami Hiramatsu (Google) <mhiramat@...nel.org>
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