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Date: Fri, 27 Mar 2020 11:49:07 +0300 From: Alexey Budankov <alexey.budankov@...ux.intel.com> To: Arnaldo Carvalho de Melo <acme@...hat.com> Cc: Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Andi Kleen <ak@...ux.intel.com>, linux-kernel <linux-kernel@...r.kernel.org> Subject: [PATCH v1 5/8] perf docs: extend stat mode docs with info on --ctl-fd[-ack] options 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@...ux.intel.com> --- tools/perf/Documentation/perf-stat.txt | 38 ++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 4d56586b2fb9..a8a279ff9cb2 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -164,6 +164,44 @@ with it. --append may be used here. Examples: 3>results perf stat --log-fd 3 -- $cmd 3>>results perf stat --log-fd 3 --append -- $cmd +--ctl-fd:: +--ctl-fd-ack:: + +Listen on ctl-fd descriptor for command to control measurement ('r': resume, 'p': pause). +Optionally send control command completion ('a') to fd-ack descriptor to synchronize with +the controlling process. Example of bash shell script to resume and pause measurements: +#!/bin/bash + +ctl_dir=/tmp/ + +ctl_fifo=${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 'r' >&${ctl_fd} && read -u ${ctl_fd_ack} r1 && echo "resumed(${r1})" +sleep 10 && echo 'p' >&${ctl_fd} && read -u ${ctl_fd_ack} p1 && echo "paused(${p1})" + +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.: -- 2.24.1
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