linux-kernel - Re: [PATCH v6 13/13] perf record: introduce --ctl-fd[-ack] options

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Message-ID: <b4315665-b5e7-ff56-d9a6-0e7870daf9c9@intel.com>
Date:   Wed, 3 Jun 2020 15:24:20 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 13/13] perf record: introduce --ctl-fd[-ack] options

On 1/06/20 11:20 pm, Alexey Budankov wrote:
> 
> Introduce --ctl-fd[-ack] options to pass open file descriptors numbers
> from command line. Extend perf-record.txt file with --ctl-fd[-ack]

perf-record.txt change seems to be missing.

> options description. Document possible usage model introduced by
> --ctl-fd[-ack] options by providing example bash shell script.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/builtin-record.c | 10 ++++++++++
>  tools/perf/util/record.h    |  2 ++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 0394e068dde8..8494ce964738 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1749,6 +1749,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>  		perf_evlist__start_workload(rec->evlist);
>  	}
>  
> +	if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
> +		goto out_child;
> +
>  	if (opts->initial_delay) {
>  		pr_info(EVLIST_DISABLED_MSG);
>  		if (opts->initial_delay > 0) {
> @@ -1895,6 +1898,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>  		record__synthesize_workload(rec, true);
>  
>  out_child:
> +	evlist__finalize_ctlfd(rec->evlist);
>  	record__mmap_read_all(rec, true);
>  	record__aio_mmap_read_sync(rec);
>  
> @@ -2380,6 +2384,8 @@ static struct record record = {
>  		},
>  		.mmap_flush          = MMAP_FLUSH_DEFAULT,
>  		.nr_threads_synthesize = 1,
> +		.ctl_fd              = -1,
> +		.ctl_fd_ack          = -1,
>  	},
>  	.tool = {
>  		.sample		= process_sample_event,
> @@ -2581,6 +2587,10 @@ static struct option __record_options[] = {
>  		"libpfm4 event selector. use 'perf list' to list available events",
>  		parse_libpfm_events_option),
>  #endif
> +	OPT_INTEGER(0, "ctl-fd", &record.opts.ctl_fd,
> +		    "Listen on fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events)"),
> +	OPT_INTEGER(0, "ctl-fd-ack", &record.opts.ctl_fd_ack,
> +		   "Send control command completion ('ack') to fd ack descriptor"),
>  	OPT_END()
>  };
>  
> diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
> index da138dcb4d34..4cb72a478af1 100644
> --- a/tools/perf/util/record.h
> +++ b/tools/perf/util/record.h
> @@ -70,6 +70,8 @@ struct record_opts {
>  	int	      mmap_flush;
>  	unsigned int  comp_level;
>  	unsigned int  nr_threads_synthesize;
> +	int	      ctl_fd;
> +	int	      ctl_fd_ack;
>  };
>  
>  extern const char * const *record_usage;
>