linux-kernel - [tip:perf/core] perf ftrace: Use pager for displaying result

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Message-ID: <tip-583359646fde8526ea9456618cc24dc359b34094@git.kernel.org>
Date:   Tue, 7 Mar 2017 00:12:01 -0800
From:   tip-bot for Namhyung Kim <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, rostedt@...dmis.org, namhyung@...nel.org,
        tglx@...utronix.de, hpa@...or.com, mingo@...nel.org,
        jolsa@...nel.org, a.p.zijlstra@...llo.nl,
        linux-kernel@...r.kernel.org, fweisbec@...il.com
Subject: [tip:perf/core] perf ftrace: Use pager for displaying result

Commit-ID:  583359646fde8526ea9456618cc24dc359b34094
Gitweb:     http://git.kernel.org/tip/583359646fde8526ea9456618cc24dc359b34094
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Fri, 24 Feb 2017 10:12:51 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 3 Mar 2017 19:07:17 -0300

perf ftrace: Use pager for displaying result

It's convenient to use the pager when seeing many lines of result.

Note that setup_pager() should be called after perf_evlist__prepare_workload()
since they can interfere each other regarding shared stdio streams.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: kernel-team@....com
Link: http://lkml.kernel.org/r/20170224011251.14946-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-ftrace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index d5b566e..6087295 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -195,6 +195,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 	signal(SIGINT, sig_handler);
 	signal(SIGUSR1, sig_handler);
 	signal(SIGCHLD, sig_handler);
+	signal(SIGPIPE, sig_handler);
 
 	if (reset_tracing_files(ftrace) < 0)
 		goto out;
@@ -247,6 +248,8 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 		goto out_close_fd;
 	}
 
+	setup_pager();
+
 	perf_evlist__start_workload(ftrace->evlist);
 
 	while (!done) {