From: Alexey Budankov <alexey.budankov@linux.intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Andi Kleen <ak@linux.intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH v5 10/13] perf stat: introduce --ctl-fd[-ack] options
Date: Mon, 1 Jun 2020 19:03:07 +0300 [thread overview]
Message-ID: <030e1d2f-02a6-b924-afb4-24aad9b87625@linux.intel.com> (raw)
In-Reply-To: <e5cac8dd-7aa4-ec7c-671c-07756907acba@linux.intel.com>
Introduce --ctl-fd[-ack] options to pass open file descriptors numbers
from command line. Extend perf-stat.txt file with --ctl-fd[-ack] options
description. Document possible usage model introduced by --ctl-fd[-ack]
options by providing example bash shell script.
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/Documentation/perf-stat.txt | 40 ++++++++++++++++++++++++++
tools/perf/builtin-stat.c | 7 +++++
tools/perf/util/stat.h | 2 ++
3 files changed, 49 insertions(+)
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 9f32f6cd558d..c4a5d31062ef 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -176,6 +176,46 @@ with it. --append may be used here. Examples:
3>results perf stat --log-fd 3 -- $cmd
3>>results perf stat --log-fd 3 --append -- $cmd
+--ctl-fd::
+--ctl-fd-ack::
+
+Listen on ctl-fd descriptor for command to control measurement ('enable': enable events,
+'disable': disable events). Optionally send control command completion ('ack') to fd-ack
+descriptor to synchronize with the controlling process. Example of bash shell script
+to enable and disable events during measurements:
+
+#!/bin/bash
+
+ctl_dir=/tmp/
+
+ctl_fifo=${ctl_dir}perf_ctl.fifo
+test -p ${ctl_fifo} && unlink ${ctl_fifo}
+mkfifo ${ctl_fifo}
+exec {ctl_fd}<>${ctl_fifo}
+
+ctl_ack_fifo=${ctl_dir}perf_ctl_ack.fifo
+test -p ${ctl_ack_fifo} && unlink ${ctl_ack_fifo}
+mkfifo ${ctl_ack_fifo}
+exec {ctl_fd_ack}<>${ctl_ack_fifo}
+
+perf stat -D -1 -e cpu-cycles -a -I 1000 \
+ --ctl-fd ${ctl_fd} --ctl-fd-ack ${ctl_fd_ack} \
+ -- sleep 30 &
+perf_pid=$!
+
+sleep 5 && echo 'enable' >&${ctl_fd} && read -u ${ctl_fd_ack} e1 && echo "enabled(${e1})"
+sleep 10 && echo 'disable' >&${ctl_fd} && read -u ${ctl_fd_ack} d1 && echo "disabled(${d1})"
+
+exec {ctl_fd_ack}>&-
+unlink ${ctl_ack_fifo}
+
+exec {ctl_fd}>&-
+unlink ${ctl_fifo}
+
+wait -n ${perf_pid}
+exit $?
+
+
--pre::
--post::
Pre and post measurement hooks, e.g.:
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 7fb08454b343..f31126df5df7 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -188,6 +188,8 @@ static struct perf_stat_config stat_config = {
.metric_only_len = METRIC_ONLY_LEN,
.walltime_nsecs_stats = &walltime_nsecs_stats,
.big_num = true,
+ .ctl_fd = -1,
+ .ctl_fd_ack = -1
};
static inline void diff_timespec(struct timespec *r, struct timespec *a,
@@ -2249,6 +2251,9 @@ int cmd_stat(int argc, const char **argv)
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);
+ if (evlist__initialize_ctlfd(evsel_list, stat_config.ctl_fd, stat_config.ctl_fd_ack))
+ goto out;
+
status = 0;
for (run_idx = 0; forever || run_idx < stat_config.run_count; run_idx++) {
if (stat_config.run_count != 1 && verbose > 0)
@@ -2268,6 +2273,8 @@ int cmd_stat(int argc, const char **argv)
if (!forever && status != -1 && (!interval || stat_config.summary))
print_counters(NULL, argc, argv);
+ evlist__finalize_ctlfd(evsel_list);
+
if (STAT_RECORD) {
/*
* We synthesize the kernel mmap record just so that older tools
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 626421ef35c2..06f0baabe775 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -133,6 +133,8 @@ struct perf_stat_config {
struct perf_cpu_map *cpus_aggr_map;
u64 *walltime_run;
struct rblist metric_events;
+ int ctl_fd;
+ int ctl_fd_ack;
};
void perf_stat__set_big_num(int set);
--
2.24.1
next prev parent reply other threads:[~2020-06-01 16:03 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-01 15:46 [PATCH v5 00/13] perf: support enable and disable commands in stat and record modes Alexey Budankov
2020-06-01 15:51 ` [PATCH v5 01/13] tools/libperf: introduce static poll file descriptors Alexey Budankov
2020-06-01 15:51 ` [PATCH v5 02/13] perf evlist: introduce control " Alexey Budankov
2020-06-01 15:52 ` [PATCH v5 03/13] perf evlist: implement control command handling functions Alexey Budankov
2020-06-01 15:53 ` [PATCH v5 04/13] perf stat: factor out body of event handling loop for system wide Alexey Budankov
2020-06-01 15:55 ` [PATCH v5 05/13] perf stat: move target check to loop control statement Alexey Budankov
2020-06-01 15:55 ` [PATCH v5 06/13] perf stat: factor out body of event handling loop for launch case Alexey Budankov
2020-06-01 15:56 ` [PATCH v5 07/13] perf stat: factor out event handling loop into dispatch_events() Alexey Budankov
2020-06-01 15:58 ` [PATCH v5 08/13] perf stat: extend -D,--delay option with -1 value Alexey Budankov
2020-06-01 16:02 ` [PATCH v5 09/13] perf stat: implement control commands handling Alexey Budankov
2020-06-01 16:03 ` Alexey Budankov [this message]
2020-06-01 16:03 ` [PATCH v5 11/13] perf record: extend -D,--delay option with -1 value Alexey Budankov
2020-06-01 16:04 ` [PATCH v5 12/13] perf record: implement control commands handling Alexey Budankov
2020-06-01 16:05 ` [PATCH v5 13/13] perf record: introduce --ctl-fd[-ack] options Alexey Budankov
2020-06-01 16:30 ` Adrian Hunter
2020-06-01 17:11 ` Alexey Budankov
2020-06-01 23:37 ` Andi Kleen
2020-06-02 8:32 ` Alexey Budankov
2020-06-02 9:12 ` Alexey Budankov
2020-06-02 13:43 ` Adrian Hunter
2020-06-05 10:51 ` Jiri Olsa
2020-06-05 13:15 ` Alexey Budankov
2020-06-05 13:57 ` Jiri Olsa
2020-06-05 14:47 ` Alexey Budankov
2020-06-05 15:23 ` Alexey Budankov
2020-06-08 8:04 ` Alexey Budankov
2020-06-08 8:45 ` Jiri Olsa
2020-06-06 8:27 ` Jiri Olsa
2020-06-01 16:53 ` [PATCH v5 00/13] perf: support enable and disable commands in stat and record modes Alexey Budankov
2020-06-01 20:21 ` Alexey Budankov
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