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Date: Wed, 6 Jan 2021 17:56:33 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Alexander Antonov <alexander.antonov@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Mark Rutland <mark.rutland@....com>,
Ian Rogers <irogers@...gle.com>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 3/6] perf stat: Basic support for iiostat in perf
On Wed, Dec 23, 2020 at 10:03 PM Alexander Antonov
<alexander.antonov@...ux.intel.com> wrote:
>
> Add basic flow for a new iiostat mode in perf. Mode is intended to
> provide four I/O performance metrics per each IIO stack: Inbound Read,
> Inbound Write, Outbound Read, Outbound Write.
It seems like a generic analysis and other archs can extend it later..
Then we can make it a bit more general.. at least, names? :)
>
> The actual code to compute the metrics and attribute it to
> evsel::perf_device is in follow-on patches.
>
> Signed-off-by: Alexander Antonov <alexander.antonov@...ux.intel.com>
> ---
> tools/perf/builtin-stat.c | 33 ++++++++++++++++++++++++++++-
> tools/perf/util/iiostat.h | 33 +++++++++++++++++++++++++++++
> tools/perf/util/stat-display.c | 38 +++++++++++++++++++++++++++++++++-
> tools/perf/util/stat-shadow.c | 11 +++++++++-
> tools/perf/util/stat.h | 1 +
> 5 files changed, 113 insertions(+), 3 deletions(-)
> create mode 100644 tools/perf/util/iiostat.h
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 72f9d0aa3f96..14c3da136927 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -67,6 +67,7 @@
> #include "util/top.h"
> #include "util/affinity.h"
> #include "util/pfm.h"
> +#include "util/iiostat.h"
> #include "asm/bug.h"
>
> #include <linux/time64.h>
> @@ -198,7 +199,8 @@ static struct perf_stat_config stat_config = {
> .walltime_nsecs_stats = &walltime_nsecs_stats,
> .big_num = true,
> .ctl_fd = -1,
> - .ctl_fd_ack = -1
> + .ctl_fd_ack = -1,
> + .iiostat_run = false,
> };
>
> static bool cpus_map_matched(struct evsel *a, struct evsel *b)
> @@ -1073,6 +1075,14 @@ static int parse_stat_cgroups(const struct option *opt,
> return parse_cgroups(opt, str, unset);
> }
>
> +__weak int iiostat_parse(const struct option *opt __maybe_unused,
> + const char *str __maybe_unused,
> + int unset __maybe_unused)
> +{
> + pr_err("iiostat mode is not supported\n");
> + return -1;
> +}
> +
> static struct option stat_options[] = {
> OPT_BOOLEAN('T', "transaction", &transaction_run,
> "hardware transaction statistics"),
> @@ -1185,6 +1195,8 @@ static struct option stat_options[] = {
> "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
> "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
> parse_control_option),
> + OPT_CALLBACK_OPTARG(0, "iiostat", &evsel_list, &stat_config, "root port",
> + "measure PCIe metrics per IIO stack", iiostat_parse),
> OPT_END()
> };
>
> @@ -1509,6 +1521,12 @@ static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
> return 0;
> }
>
> +__weak int iiostat_show_root_ports(struct evlist *evlist __maybe_unused,
> + struct perf_stat_config *config __maybe_unused)
> +{
> + return 0;
> +}
I think it's too specific, maybe iiostat_prepare() ?
> +
> /*
> * Add default attributes, if there were no attributes specified or
> * if -d/--detailed, -d -d or -d -d -d is used:
> @@ -2054,6 +2072,10 @@ static void setup_system_wide(int forks)
> }
> }
>
> +__weak void iiostat_delete_root_ports(struct evlist *evlist __maybe_unused)
> +{
> +}
Same here..
> +
> int cmd_stat(int argc, const char **argv)
> {
> const char * const stat_usage[] = {
> @@ -2230,6 +2252,12 @@ int cmd_stat(int argc, const char **argv)
> goto out;
> }
>
> + if (stat_config.iiostat_run) {
> + status = iiostat_show_root_ports(evsel_list, &stat_config);
> + if (status || !stat_config.iiostat_run)
> + goto out;
> + }
> +
> if (add_default_attributes())
> goto out;
>
> @@ -2406,6 +2434,9 @@ int cmd_stat(int argc, const char **argv)
> perf_stat__exit_aggr_mode();
> perf_evlist__free_stats(evsel_list);
> out:
> + if (stat_config.iiostat_run)
> + iiostat_delete_root_ports(evsel_list);
> +
> zfree(&stat_config.walltime_run);
>
> if (smi_cost && smi_reset)
> diff --git a/tools/perf/util/iiostat.h b/tools/perf/util/iiostat.h
> new file mode 100644
> index 000000000000..8d4226df9975
> --- /dev/null
> +++ b/tools/perf/util/iiostat.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * perf iiostat
> + *
> + * Copyright (C) 2020, Intel Corporation
> + *
> + * Authors: Alexander Antonov <alexander.antonov@...ux.intel.com>
> + */
> +
> +#ifndef _IIOSTAT_H
> +#define _IIOSTAT_H
> +
> +#include <subcmd/parse-options.h>
> +#include "util/stat.h"
> +#include "util/parse-events.h"
> +#include "util/evlist.h"
> +
> +struct option;
> +struct perf_stat_config;
> +struct evlist;
> +struct timespec;
> +
> +int iiostat_parse(const struct option *opt, const char *str,
> + int unset __maybe_unused);
> +void iiostat_prefix(struct perf_stat_config *config, struct evlist *evlist,
> + char *prefix, struct timespec *ts);
> +void iiostat_print_metric(struct perf_stat_config *config, struct evsel *evsel,
> + struct perf_stat_output_ctx *out);
> +int iiostat_show_root_ports(struct evlist *evlist,
> + struct perf_stat_config *config);
> +void iiostat_delete_root_ports(struct evlist *evlist);
> +
> +#endif /* _IIOSTAT_H */
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 3bfcdb80443a..9eb8484e8b90 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -17,6 +17,7 @@
> #include "cgroup.h"
> #include <api/fs/fs.h>
> #include "util.h"
> +#include "iiostat.h"
>
> #define CNTR_NOT_SUPPORTED "<not supported>"
> #define CNTR_NOT_COUNTED "<not counted>"
> @@ -310,6 +311,12 @@ static void print_metric_header(struct perf_stat_config *config,
> struct outstate *os = ctx;
> char tbuf[1024];
>
> + /* In case of iiostat, print metric header for first perf_device only */
> + if (os->evsel->perf_device && os->evsel->evlist->selected->perf_device &&
> + config->iiostat_run &&
When is the perf_device set? Is it possible to be NULL in the iiostat mode?
Thanks,
Namhyung
> + os->evsel->perf_device != os->evsel->evlist->selected->perf_device)
> + return;
> +
> if (!valid_only_metric(unit))
> return;
> unit = fixunit(tbuf, os->evsel, unit);
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