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perf tools: Introduce usage_with_options_msg()

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Now usage_with_options() setup a pager before printing message so normal
printf() or pr_err() will not be shown.  The usage_with_options_msg()
can be used to print some help message before usage strings.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445701767-12731-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2015-10-25 00:49:27 +09:00
committed by Arnaldo Carvalho de Melo
parent 01b19455c0
commit c711836972
9 changed files with 62 additions and 28 deletions
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11
tools/perf/builtin-record.c
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@@ -1135,14 +1135,15 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
usage_with_options(record_usage, record_options);
if (nr_cgroups && !rec->opts.target.system_wide) {
ui__error("cgroup monitoring only available in"
" system-wide mode\n");
usage_with_options(record_usage, record_options);
usage_with_options_msg(record_usage, record_options,
"cgroup monitoring only available in system-wide mode");
}
if (rec->opts.record_switch_events &&
!perf_can_record_switch_events()) {
ui__error("kernel does not support recording context switch events (--switch-events option)\n");
usage_with_options(record_usage, record_options);
ui__error("kernel does not support recording context switch events\n");
parse_options_usage(record_usage, record_options, "switch-events", 0);
return -EINVAL;
}
if (!rec->itr) {