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Date: Sat, 25 Jan 2020 17:18:26 +0100
From: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf evswitch: Add
--switch-on-delay/--switch-off-delay
Em Sat, Jan 25, 2020 at 07:10:58PM +0300, Konstantin Khlebnikov escreveu:
> Events set by --switch-on/--switch-off make effect immediately. This patch
> adds controllable delay for them. Repeated switch event restarts delay.
> This allows collect samples while periodic signal pulses (switch-off-delay)
> or start when pulse stops beating (switch-on-delay).
>
> This example highlights where IRQs are disabled longer than for 5ms.
> Cycles is a NMI samples by PMU and cpu-clock is a software timer samples:
> when cpu-clock stops ticking this means IRQs are disabled.
>
> # perf top -C 0 --event cycles --event cpu-clock --switch-on cpu-clock
> --switch-on-delay 5 --switch-off cpu-clock --sort symbol -g -F 1000 -d 10
Cool stuff, I'm travelling, so will take some time to process, but
thanks for working on this!
- Arnaldo
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> ---
> tools/perf/Documentation/perf-report.txt | 6 ++++++
> tools/perf/Documentation/perf-script.txt | 6 ++++++
> tools/perf/Documentation/perf-top.txt | 6 ++++++
> tools/perf/Documentation/perf-trace.txt | 6 ++++++
> tools/perf/builtin-report.c | 2 +-
> tools/perf/builtin-script.c | 2 +-
> tools/perf/builtin-top.c | 2 +-
> tools/perf/builtin-trace.c | 2 +-
> tools/perf/util/evswitch.c | 22 ++++++++++++++++++----
> tools/perf/util/evswitch.h | 9 ++++++++-
> 10 files changed, 54 insertions(+), 9 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
> index 8dbe2119686a..b83c0f700345 100644
> --- a/tools/perf/Documentation/perf-report.txt
> +++ b/tools/perf/Documentation/perf-report.txt
> @@ -448,6 +448,12 @@ OPTIONS
> --switch-off EVENT_NAME::
> Stop considering events after this event is found.
>
> +--switch-on-delay::
> + Msecs to delay switch-on after last ocurrence of on-event.
> +
> +--switch-off-delay::
> + Msecs to delay switch-off after last ocurrence of off-event.
> +
> --show-on-off-events::
> Show the --switch-on/off events too. This has no effect in 'perf report' now
> but probably we'll make the default not to show the switch-on/off events
> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
> index 2599b057e47b..ba3dbe64f1e5 100644
> --- a/tools/perf/Documentation/perf-script.txt
> +++ b/tools/perf/Documentation/perf-script.txt
> @@ -423,6 +423,12 @@ include::itrace.txt[]
> --switch-off EVENT_NAME::
> Stop considering events after this event is found.
>
> +--switch-on-delay::
> + Msecs to delay switch-on after last ocurrence of on-event.
> +
> +--switch-off-delay::
> + Msecs to delay switch-off after last ocurrence of off-event.
> +
> --show-on-off-events::
> Show the --switch-on/off events too.
>
> diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
> index 5596129a71cf..0fe1795f62fb 100644
> --- a/tools/perf/Documentation/perf-top.txt
> +++ b/tools/perf/Documentation/perf-top.txt
> @@ -297,6 +297,12 @@ Default is to monitor all CPUS.
> --switch-off EVENT_NAME::
> Stop considering events after this event is found.
>
> +--switch-on-delay::
> + Msecs to delay switch-on after last ocurrence of on-event.
> +
> +--switch-off-delay::
> + Msecs to delay switch-off after last ocurrence of off-event.
> +
> --show-on-off-events::
> Show the --switch-on/off events too. This has no effect in 'perf top' now
> but probably we'll make the default not to show the switch-on/off events
> diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
> index abc9b5d83312..df9e9333fc39 100644
> --- a/tools/perf/Documentation/perf-trace.txt
> +++ b/tools/perf/Documentation/perf-trace.txt
> @@ -191,6 +191,12 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
> --switch-off EVENT_NAME::
> Stop considering events after this event is found.
>
> +--switch-on-delay::
> + Msecs to delay switch-on after last ocurrence of on-event.
> +
> +--switch-off-delay::
> + Msecs to delay switch-off after last ocurrence of off-event.
> +
> --show-on-off-events::
> Show the --switch-on/off events too.
>
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index f03120c641c0..451bf03120b7 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -261,7 +261,7 @@ static int process_sample_event(struct perf_tool *tool,
> if (rep->cpu_list && !test_bit(sample->cpu, rep->cpu_bitmap))
> return 0;
>
> - if (evswitch__discard(&rep->evswitch, evsel))
> + if (evswitch__discard(&rep->evswitch, evsel, sample->time))
> return 0;
>
> if (machine__resolve(machine, &al, sample) < 0) {
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index e2406b291c1c..ba7b08126e72 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1861,7 +1861,7 @@ static void process_event(struct perf_script *script,
> if (!show_event(sample, evsel, thread, al))
> return;
>
> - if (evswitch__discard(&script->evswitch, evsel))
> + if (evswitch__discard(&script->evswitch, evsel, sample->time))
> return;
>
> ++es->samples;
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index 795e353de095..daea6934a97b 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -1151,7 +1151,7 @@ static int deliver_event(struct ordered_events *qe,
> assert(evsel != NULL);
>
> if (event->header.type == PERF_RECORD_SAMPLE) {
> - if (evswitch__discard(&top->evswitch, evsel))
> + if (evswitch__discard(&top->evswitch, evsel, sample.time))
> return 0;
> ++top->samples;
> }
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 46a72ecac427..51478d64752e 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -3083,7 +3083,7 @@ static void trace__handle_event(struct trace *trace, union perf_event *event, st
> return;
> }
>
> - if (evswitch__discard(&trace->evswitch, evsel))
> + if (evswitch__discard(&trace->evswitch, evsel, sample->time))
> return;
>
> trace__set_base_time(trace, evsel, sample);
> diff --git a/tools/perf/util/evswitch.c b/tools/perf/util/evswitch.c
> index 3ba72f743d3c..6573e91fabdc 100644
> --- a/tools/perf/util/evswitch.c
> +++ b/tools/perf/util/evswitch.c
> @@ -3,26 +3,40 @@
>
> #include "evswitch.h"
> #include "evlist.h"
> +#include <linux/time64.h>
>
> -bool evswitch__discard(struct evswitch *evswitch, struct evsel *evsel)
> +bool evswitch__discard(struct evswitch *evswitch, struct evsel *evsel, u64 time)
> {
> - if (evswitch->on && evswitch->discarding) {
> + bool discard = evswitch->discarding ||
> + perf_time__skip_sample(&evswitch->time_range, time);
> +
> + if (evswitch->on && discard) {
> if (evswitch->on != evsel)
> return true;
>
> evswitch->discarding = false;
>
> + if (evswitch->on_delay) {
> + evswitch->time_range.start = time +
> + evswitch->on_delay * NSEC_PER_MSEC;
> + evswitch->time_range.end = 0;
> + }
> +
> if (!evswitch->show_on_off_events)
> return true;
>
> return false;
> }
>
> - if (evswitch->off && !evswitch->discarding) {
> + if (evswitch->off && !discard) {
> if (evswitch->off != evsel)
> return false;
>
> - evswitch->discarding = true;
> + if (evswitch->off_delay)
> + evswitch->time_range.end = time +
> + evswitch->off_delay * NSEC_PER_MSEC;
> + else
> + evswitch->discarding = true;
>
> if (!evswitch->show_on_off_events)
> return true;
> diff --git a/tools/perf/util/evswitch.h b/tools/perf/util/evswitch.h
> index fd30460b6218..2746082c7dc9 100644
> --- a/tools/perf/util/evswitch.h
> +++ b/tools/perf/util/evswitch.h
> @@ -5,6 +5,7 @@
>
> #include <stdbool.h>
> #include <stdio.h>
> +#include "util/time-utils.h"
>
> struct evsel;
> struct evlist;
> @@ -12,19 +13,25 @@ struct evlist;
> struct evswitch {
> struct evsel *on, *off;
> const char *on_name, *off_name;
> + unsigned int on_delay, off_delay;
> bool discarding;
> + struct perf_time_interval time_range;
> bool show_on_off_events;
> };
>
> int evswitch__init(struct evswitch *evswitch, struct evlist *evlist, FILE *fp);
>
> -bool evswitch__discard(struct evswitch *evswitch, struct evsel *evsel);
> +bool evswitch__discard(struct evswitch *evswitch, struct evsel *evsel, u64 time);
>
> #define OPTS_EVSWITCH(evswitch) \
> OPT_STRING(0, "switch-on", &(evswitch)->on_name, \
> "event", "Consider events after the ocurrence of this event"), \
> OPT_STRING(0, "switch-off", &(evswitch)->off_name, \
> "event", "Stop considering events after the ocurrence of this event"), \
> + OPT_UINTEGER(0, "switch-on-delay", &(evswitch)->on_delay, \
> + "ms to delay switch-on after last ocurrence of on-event"), \
> + OPT_UINTEGER(0, "switch-off-delay", &(evswitch)->off_delay, \
> + "ms to delay switch-off after last ocurrence of off-event"), \
> OPT_BOOLEAN(0, "show-on-off-events", &(evswitch)->show_on_off_events, \
> "Show the on/off switch events, used with --switch-on and --switch-off")
>
>
--
- Arnaldo
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