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perf ftrace: Use pager for displaying result

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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 <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Namhyung Kim 2017-02-24 10:12:51 +09:00 • committed by Arnaldo Carvalho de Melo
commit 583359646f
1 changed files with 3 additions and 0 deletions
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3
tools/perf/builtin-ftrace.c
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@ -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) {