linux-kernel - Re: [PATCH 1/2] perf tools: Add a per tracepoint counter attribute to get raw sample

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Date:	Fri, 14 Aug 2009 12:07:04 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 1/2] perf tools: Add a per tracepoint counter attribute
	to get raw sample

Sorry, please ignore this one, it has been resent by mistake :-(

On Fri, Aug 14, 2009 at 12:04:58PM +0200, Frederic Weisbecker wrote:
> Add a new flag field while opening a tracepoint perf counter:
> 
> 	-e tracepoint_subsystem:tracepoint_name:flags
> 
> This is intended to be generic although for now it only supports the
> r[e[c[o[r[d]]]]] flag:
> 
> 	./perf record -e workqueue:workqueue_insertion:record
> 	./perf record -e workqueue:workqueue_insertion:r
> 
> will have the same effect: enabling the raw samples record for the
> given tracepoint counter.
> 
> In the future, we may want to support further flags, separated by
> commas.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Mike Galbraith <efault@....de>
> ---
>  tools/perf/builtin-record.c    |    2 +-
>  tools/perf/util/parse-events.c |   10 ++++++++++
>  2 files changed, 11 insertions(+), 1 deletions(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 5aeb632..3be0301 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -380,7 +380,7 @@ static void create_counter(int counter, int cpu, pid_t pid)
>  				  PERF_FORMAT_TOTAL_TIME_RUNNING |
>  				  PERF_FORMAT_ID;
>  
> -	attr->sample_type	= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
> +	attr->sample_type	|= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
>  
>  	if (freq) {
>  		attr->sample_type	|= PERF_SAMPLE_PERIOD;
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index a5d661b..4bab278 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -379,6 +379,7 @@ static int parse_tracepoint_event(const char **strp,
>  				    struct perf_counter_attr *attr)
>  {
>  	const char *evt_name;
> +	char *flags;
>  	char sys_name[MAX_EVENT_LENGTH];
>  	char id_buf[4];
>  	int fd;
> @@ -400,6 +401,15 @@ static int parse_tracepoint_event(const char **strp,
>  	strncpy(sys_name, *strp, sys_length);
>  	sys_name[sys_length] = '\0';
>  	evt_name = evt_name + 1;
> +
> +	flags = strchr(evt_name, ':');
> +	if (flags) {
> +		*flags = '\0';
> +		flags++;
> +		if (!strncmp(flags, "record", strlen(flags)))
> +			attr->sample_type |= PERF_SAMPLE_RAW;
> +	}
> +
>  	evt_length = strlen(evt_name);
>  	if (evt_length >= MAX_EVENT_LENGTH)
>  		return 0;
> -- 
> 1.6.2.3
> 

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