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Date: Thu, 28 Oct 2021 02:11:24 +0800
From: Tao Zhou <tao.zhou@...ux.dev>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>,
Tom Zanussi <zanussi@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Juri Lelli <juri.lelli@...hat.com>,
Clark Williams <williams@...hat.com>,
John Kacur <jkacur@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
linux-kernel@...r.kernel.org, Tao Zhou <tao.zhou@...ux.dev>
Subject: Re: [PATCH V6 11/20] rtla/osnoise: Add the hist mode
On Wed, Oct 27, 2021 at 12:06:22AM +0200, Daniel Bristot de Oliveira wrote:
> The rtla osnoise hist tool collects all osnoise:sample_threshold
> occurrence in a histogram, displaying the results in a user-friendly
> way. The tool also allows many configurations of the osnoise tracer
> and the collection of the tracer output.
>
> Here is one example of the rtla osnoise hist tool output:
> ---------- %< ----------
> [root@f34 ~]# rtla osnoise hist --bucket-size 10 --entries 100 -c 0-8 -d 1M -r 9000 -P F:1
> # RTLA osnoise histogram
> # Time unit is microseconds (us)
> # Duration: 0 00:01:00
> Index CPU-000 CPU-001 CPU-002 CPU-003 CPU-004 CPU-005 CPU-006 CPU-007 CPU-008
> 0 430 434 352 455 440 463 467 436 484
> 10 88 88 92 141 120 100 126 166 100
> 20 19 7 12 22 8 8 13 13 16
> 30 6 0 2 0 1 2 2 1 0
> 50 0 0 0 0 0 0 1 0 0
> over: 0 0 0 0 0 0 0 0 0
> count: 543 529 458 618 569 573 609 616 600
> min: 0 0 0 0 0 0 0 0 0
> avg: 0 0 0 0 0 0 0 0 0
> max: 30 20 30 20 30 30 50 30 20
> ---------- >% ----------
>
> Running
> - rtla osnoise hist --help
>
> provides information about the available options.
>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Tom Zanussi <zanussi@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Clark Williams <williams@...hat.com>
> Cc: John Kacur <jkacur@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
> Cc: linux-rt-users@...r.kernel.org
> Cc: linux-trace-devel@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
> tools/tracing/rtla/src/osnoise.c | 6 +-
> tools/tracing/rtla/src/osnoise.h | 1 +
> tools/tracing/rtla/src/osnoise_hist.c | 793 ++++++++++++++++++++++++++
> 3 files changed, 799 insertions(+), 1 deletion(-)
> create mode 100644 tools/tracing/rtla/src/osnoise_hist.c
>
> diff --git a/tools/tracing/rtla/src/osnoise.c b/tools/tracing/rtla/src/osnoise.c
> index b9866dfdda66..6c6358ebf66f 100644
> --- a/tools/tracing/rtla/src/osnoise.c
> +++ b/tools/tracing/rtla/src/osnoise.c
> @@ -790,7 +790,8 @@ static void osnoise_usage(void)
> " usage: [rtla] osnoise [MODE] ...",
> "",
> " modes:",
> - " top - prints the summary from osnoise tracer",
> + " top - prints the summary from osnoise tracer",
> + " hist - prints a histogram of osnoise samples",
> "",
> "if no MODE is given, the top mode is called, passing the arguments",
> NULL,
> @@ -825,6 +826,9 @@ int osnoise_main(int argc, char *argv[])
> } else if (strcmp(argv[1], "top") == 0) {
> osnoise_top_main(argc-1, &argv[1]);
> exit(0);
> + } else if (strcmp(argv[1], "hist") == 0) {
> + osnoise_hist_main(argc-1, &argv[1]);
> + exit(0);
> }
>
> usage:
> diff --git a/tools/tracing/rtla/src/osnoise.h b/tools/tracing/rtla/src/osnoise.h
> index 4882ee275ea0..dbaad7a162a2 100644
> --- a/tools/tracing/rtla/src/osnoise.h
> +++ b/tools/tracing/rtla/src/osnoise.h
> @@ -82,5 +82,6 @@ void osnoise_destroy_tool(struct osnoise_tool *top);
> struct osnoise_tool *osnoise_init_tool(char *tool_name);
> struct osnoise_tool *osnoise_init_trace_tool(char *tracer);
>
> +int osnoise_hist_main(int argc, char *argv[]);
> int osnoise_top_main(int argc, char **argv);
> int osnoise_main(int argc, char **argv);
> diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
> new file mode 100644
> index 000000000000..c93f30d69795
> --- /dev/null
> +++ b/tools/tracing/rtla/src/osnoise_hist.c
> @@ -0,0 +1,793 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@...nel.org>
> + */
> +
> +#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 "utils.h"
> +#include "osnoise.h"
> +
> +struct osnoise_hist_params {
> + char *cpus;
> + char *monitored_cpus;
> + char *trace_output;
> + unsigned long long runtime;
> + unsigned long long period;
> + long long stop_us;
> + long long stop_total_us;
> + int sleep_time;
> + int duration;
> + int set_sched;
> + int output_divisor;
> + struct sched_attr sched_param;
> +
> + char no_header;
> + char no_summary;
> + char no_index;
> + char with_zeros;
> + int bucket_size;
> + int entries;
> +};
> +
> +struct osnoise_hist_cpu {
> + int *samples;
> + int *thread;
> +
> + int count;
> + int thread_count;
> +
> + unsigned long long min_sample;
> + unsigned long long sum_sample;
> + unsigned long long max_sample;
> +
> + unsigned long long min_thread;
> + unsigned long long sum_thread;
> + unsigned long long max_thread;
> +};
> +
> +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);
> +
> + if (data->hist[cpu].thread)
> + free(data->hist[cpu].thread);
> + }
> +
> + /* 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;
> +
> + /* one set of histograms per CPU */
> + data->hist = calloc(1, sizeof(*data->hist) * nr_cpus);
> + if (!data->hist)
> + goto cleanup;
> +
> + /* one histogram for IRQ and one for thread, per cpu */
> + for (cpu = 0; cpu < nr_cpus; cpu++) {
> + data->hist[cpu].samples = calloc(1, sizeof(*data->hist) * (entries + 1));
@samples is a pointer to int and used for int array. The "sizeof(*data->hist)"
should be "sizeof(int)" or am I totally wrong.
The same in PATCH 13.
Thanks,
Tao
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