Re: [PATCH V8 3/7] perf, record: introduce --freq-perf option

[Jiri Olsa]

On Thu, Sep 03, 2015 at 08:30:59AM -0400, kan.liang@xxxxxxxxx wrote:
> From: Kan Liang <kan.liang@xxxxxxxxx>
> 
> To generate the frequency and performance output, perf must sample read
> special events like cycles, ref-cycles, msr/tsc/, msr/aperf/ or
> msr/mperf/.
> With the --freq-perf option, perf record can automatically check and add
> those event into evlist for sampling read.

hum, not sure this is a big or small thing:

[jolsa@ibm-x3650m4-01 perf]$ ./perf record --freq-perf -e cache-misses ls

SNIP

[ perf record: Woken up 13 times to write data ]
[ perf record: Captured and wrote 0.014 MB perf.data (147 samples) ]
[jolsa@ibm-x3650m4-01 perf]$ ./perf report -D
non matching read_format[jolsa@ibm-x3650m4-01 perf]$


jirka

> 
> Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
> ---
>  tools/perf/Documentation/perf-record.txt |  4 ++++
>  tools/perf/builtin-record.c              | 39 +++++++++++++++++++++++++++++++-
>  tools/perf/util/session.h                | 10 ++++++++
>  3 files changed, 52 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index 2e9ce77..3f40712 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -308,6 +308,10 @@ This option sets the time out limit. The default value is 500 ms.
>  Record context switch events i.e. events of type PERF_RECORD_SWITCH or
>  PERF_RECORD_SWITCH_CPU_WIDE.
>  
> +--freq-perf::
> +Add frequency and performance related events to do sample read.
> +These events include cycles, ref-cycles, msr/tsc/, msr/aperf/ and msr/mperf/.
> +
>  SEE ALSO
>  --------
>  linkperf:perf-stat[1], linkperf:perf-list[1]
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 142eeb3..e87dda3 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -13,7 +13,7 @@
>  #include "util/util.h"
>  #include "util/parse-options.h"
>  #include "util/parse-events.h"
> -
> +#include "util/pmu.h"
>  #include "util/callchain.h"
>  #include "util/cgroup.h"
>  #include "util/header.h"
> @@ -50,6 +50,7 @@ struct record {
>  	bool			no_buildid;
>  	bool			no_buildid_cache;
>  	long			samples;
> +	bool			freq_perf;
>  };
>  
>  static int record__write(struct record *rec, void *bf, size_t size)
> @@ -948,6 +949,35 @@ out_free:
>  	return ret;
>  }
>  
> +const char *freq_perf_events[FREQ_PERF_MAX][3] = {
> +	{ "msr", "tsc", "msr/tsc/" },
> +	{ "msr", "aperf", "msr/aperf/" },
> +	{ "msr", "mperf", "msr/mperf/" },
> +	{ NULL, "cycles", "cycles" },
> +	{ NULL, "ref-cycles", "ref-cycles" },
> +};
> +
> +static int
> +record_add_freq_perf_events(struct perf_evlist *evlist)
> +{
> +	int i;
> +	char freq_perf_attrs[100];
> +
> +	strcpy(freq_perf_attrs, "{cycles,ref-cycles");
> +	for (i = 0; i < FREQ_PERF_MAX; i++) {
> +		if ((i == FREQ_PERF_CYCLES) ||
> +		    (i == FREQ_PERF_REF_CYCLES))
> +			continue;
> +		if (pmu_have_event(freq_perf_events[i][0], freq_perf_events[i][1])) {
> +			strcat(freq_perf_attrs, ",");
> +			strcat(freq_perf_attrs, freq_perf_events[i][2]);
> +		}
> +	}
> +	strcat(freq_perf_attrs, "}:S");
> +
> +	return parse_events(evlist, freq_perf_attrs, NULL);
> +}
> +
>  static const char * const __record_usage[] = {
>  	"perf record [<options>] [<command>]",
>  	"perf record [<options>] -- <command> [<options>]",
> @@ -1096,6 +1126,8 @@ struct option __record_options[] = {
>  			"per thread proc mmap processing timeout in ms"),
>  	OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
>  		    "Record context switch events"),
> +	OPT_BOOLEAN(0, "freq-perf", &record.freq_perf,
> +		    "Add frequency and performance related events to do sample read."),
>  	OPT_END()
>  };
>  
> @@ -1157,6 +1189,11 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
>  	if (rec->no_buildid_cache || rec->no_buildid)
>  		disable_buildid_cache();
>  
> +	if (rec->freq_perf && record_add_freq_perf_events(rec->evlist)) {
> +		pr_err("Cannot set up freq and performance events\n");
> +		goto out_symbol_exit;
> +	}
> +
>  	if (rec->evlist->nr_entries == 0 &&
>  	    perf_evlist__add_default(rec->evlist) < 0) {
>  		pr_err("Not enough memory for event selector list\n");
> diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
> index b44afc7..3915be7 100644
> --- a/tools/perf/util/session.h
> +++ b/tools/perf/util/session.h
> @@ -42,6 +42,16 @@ struct perf_session {
>  #define PRINT_IP_OPT_ONELINE	(1<<4)
>  #define PRINT_IP_OPT_SRCLINE	(1<<5)
>  
> +enum perf_freq_perf_index {
> +	FREQ_PERF_TSC		= 0,
> +	FREQ_PERF_APERF		= 1,
> +	FREQ_PERF_MPERF		= 2,
> +	FREQ_PERF_CYCLES	= 3,
> +	FREQ_PERF_REF_CYCLES	= 4,
> +
> +	FREQ_PERF_MAX
> +};
> +
>  struct perf_tool;
>  
>  struct perf_session *perf_session__new(struct perf_data_file *file,
> -- 
> 1.8.3.1
> 
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