perf record: Clarify help for --switch-output
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 record -h ... --switch-output[=<signal,size,time>] Switch output when receive SIGUSR2 or cross size,time threshold After: % perf record -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@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> LPU-Reference: 20190314225002.30108-4-andi@firstfloor.org Link: https://lkml.kernel.org/n/tip-9yecyuha04nyg8toyd1b2pgi@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1989,8 +1989,8 @@ static struct option __record_options[] = {
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OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
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"Record timestamp boundary (time of first/last samples)"),
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OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
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&record.switch_output.set, "signal,size,time",
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"Switch output when receive SIGUSR2 or cross size,time threshold",
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&record.switch_output.set, "signal or size[BKMG] or time[smhd]",
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"Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
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"signal"),
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OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
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"Limit number of switch output generated files"),
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