linux-kernel - [PATCH v1 04/10] perf, tools, record: Clarify help for --switch-output

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Date:   Mon, 11 Mar 2019 13:24:40 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 04/10] perf, tools, record: Clarify help for --switch-output

From: Andi Kleen <ak@...ux.intel.com>

The help description for --switch-output looks like there
are multiple comma separated fields. But it's actually a choice
of different options. Make it clear and less confusing.

Before:

% perf report -h
...
        --switch-output[=<signal,size,time>]
                          Switch output when receive SIGUSR2 or cross size,time threshold

After:

% perf report -h
...

        --switch-output[=<signal or size[BKMG] or time[smhd]>]
                          Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/builtin-record.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 02d7c40b2d10..e7144a1c1c82 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1989,8 +1989,8 @@ static struct option __record_options[] = {
 	OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
 		    "Record timestamp boundary (time of first/last samples)"),
 	OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
-			  &record.switch_output.set, "signal,size,time",
-			  "Switch output when receive SIGUSR2 or cross size,time threshold",
+			  &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
+			  "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
 			  "signal"),
 	OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
 		   "Limit number of switch output generated files"),
-- 
2.20.1