linux-kernel - Re: [PATCH 3/3] perf kvm: Print kvm specific --help output

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Date:	Tue, 07 Oct 2014 15:16:19 +0400
From:	Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 3/3] perf kvm: Print kvm specific --help output


Hello,

Namhyung Kim <namhyung@...nel.org> writes:

> The 'perf kvm stat record' tool is an alias of 'perf record' with
> predefined kvm related options. All options that passed to 'perf kvm
> stat record' are processed by the 'perf record' tool. So, 'perf kvm
> stat record --help' prints help of usage for the 'perf record'
> command. There are a few options useful for 'perf kvm stat record',
> the rest either break kvm related output or don't change it.
>
> Let's print safe for 'perf kvm stat record' options in addition to
> general 'perf record' --help output.

We probably want s/in addition to general 'perf record' --help output//

>
> With this patch, new output looks like below:
>
>   $ perf kvm stat record -h
>
>    usage: perf kvm stat record [<options>]
>
>       -p, --pid <pid>       record events on existing process id
>       -t, --tid <tid>       record events on existing thread id
>       -r, --realtime <n>    collect data with this RT SCHED_FIFO priority
>           --no-buffering    collect data without buffering
>       -a, --all-cpus        system-wide collection from all CPUs
>       -C, --cpu <cpu>       list of cpus to monitor
>       -c, --count <n>       event period to sample
>       -o, --output <file>   output file name
>       -i, --no-inherit      child tasks do not inherit counters
>       -m, --mmap-pages <pages>
>                             number of mmap data pages
>       -v, --verbose         be more verbose (show counter open errors, etc)
>       -q, --quiet           don't print any message
>       -s, --stat            per thread counts
>       -D, --delay <n>       ms to wait before starting measurement after program start
>       -u, --uid <user>      user to profile
>           --per-thread      use per-thread mmaps
>
>   $ perf kvm stat record -n sleep 1
>     Error: switch `n' is not usable
>
>    usage: perf kvm stat record [<options>]
>
> Cc: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-kvm.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 460a4ce9c044..c029d0fdc93e 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -1132,6 +1132,10 @@ kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
>  		"-m", "1024",
>  		"-c", "1",
>  	};
> +	const char * const kvm_stat_record_usage[] = {
> +		"perf kvm stat record [<options>]",
> +		NULL
> +	};
>  	const char * const *events_tp;
>  	events_tp_size = 0;
>
> @@ -1159,6 +1163,27 @@ kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
>  	for (j = 1; j < (unsigned int)argc; j++, i++)
>  		rec_argv[i] = argv[j];
>
> +	set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
> +	set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
> +	set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
> +
> +	set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
> +	set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
> +
> +	record_usage = kvm_stat_record_usage;
>  	return cmd_record(i, rec_argv, NULL);
>  }


Otherwise it works for me.
Thanks!

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