From: Namhyung Kim <namhyung....@lge.com>

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

Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/builtin-ftrace.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 97293cee5597..f4efa1475cf9 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -188,6 +188,7 @@ static int do_ftrace_live(struct perf_ftrace *ftrace)
        signal(SIGINT, sig_handler);
        signal(SIGUSR1, sig_handler);
        signal(SIGCHLD, sig_handler);
+       signal(SIGPIPE, sig_handler);
 
        if (setup_tracing_files(ftrace) < 0)
                goto out_reset;
@@ -1461,6 +1462,8 @@ __cmd_ftrace_live(struct perf_ftrace *ftrace, int argc, 
const char **argv)
                                                  argv, false, true) < 0)
                goto out_maps;
 
+       setup_pager();
+
        ret = do_ftrace_live(ftrace);
 
 out_maps:
@@ -1582,6 +1585,8 @@ __cmd_ftrace_show(struct perf_ftrace *ftrace, int argc, 
const char **argv)
        if (ftrace->dirname == NULL)
                ftrace->dirname = DEFAULT_DIRNAME;
 
+       setup_pager();
+
        ret = do_ftrace_show(ftrace);
 
        perf_evlist__delete_maps(ftrace->evlist);
@@ -1643,6 +1648,7 @@ __cmd_ftrace_report(struct perf_ftrace *ftrace, int argc, 
const char **argv)
        perf_hpp__column_enable(PERF_HPP__OVERHEAD);
        perf_hpp__init();
 
+       setup_pager();
        setup_sorting();
 
        symbol_conf.exclude_other = false;
-- 
1.7.11.7

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