linux-kernel - Re: [PATCH V6 3/3] perf tools: adding support for address filters

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Message-ID: <a157cb6b-9743-4c63-d5d4-3f7d467f1b59@intel.com>
Date:   Fri, 16 Sep 2016 15:44:30 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>, acme@...nel.org
Cc:     mingo@...hat.com, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        acme@...radead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V6 3/3] perf tools: adding support for address filters

On 15/09/16 19:37, Mathieu Poirier wrote:
> This patch makes it possible to use the current filter
> framework with address filters.  That way address filters for
> HW tracers such as CoreSight and IntelPT can be communicated

IntelPT -> Intel PT

> to the kernel drivers.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>

Otherwise:

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/util/evsel.c        |  5 +++++
>  tools/perf/util/evsel.h        |  2 ++
>  tools/perf/util/parse-events.c | 39 ++++++++++++++++++++++++++++++++++-----
>  3 files changed, 41 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index a99e82d97df2..e0bb399dcdd4 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1067,6 +1067,11 @@ int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
>  	return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
>  }
>  
> +int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
> +{
> +	return perf_evsel__append_filter(evsel, "%s,%s", filter);
> +}
> +
>  int perf_evsel__enable(struct perf_evsel *evsel)
>  {
>  	int nthreads = thread_map__nr(evsel->threads);
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 36ed0997e65b..49c51fb3d05c 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -234,6 +234,8 @@ void perf_evsel__set_sample_id(struct perf_evsel *evsel,
>  
>  int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter);
>  int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter);
> +int perf_evsel__append_addr_filter(struct perf_evsel *evsel,
> +				   const char *filter);
>  int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
>  			     const char *filter);
>  int perf_evsel__enable(struct perf_evsel *evsel);
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 751b48fc641c..c23f2d5fc134 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1755,20 +1755,49 @@ foreach_evsel_in_last_glob(struct perf_evlist *evlist,
>  static int set_filter(struct perf_evsel *evsel, const void *arg)
>  {
>  	const char *str = arg;
> +	bool found = false;
> +	int nr_addr_filters = 0;
> +	struct perf_pmu *pmu = NULL;
>  
> -	if (evsel == NULL || evsel->attr.type != PERF_TYPE_TRACEPOINT) {
> -		fprintf(stderr,
> -			"--filter option should follow a -e tracepoint option\n");
> -		return -1;
> +	if (evsel == NULL)
> +		goto err;
> +
> +	if (evsel->attr.type == PERF_TYPE_TRACEPOINT) {
> +		if (perf_evsel__append_tp_filter(evsel, str) < 0) {
> +			fprintf(stderr,
> +				"not enough memory to hold filter string\n");
> +			return -1;
> +		}
> +
> +		return 0;
>  	}
>  
> -	if (perf_evsel__append_tp_filter(evsel, str) < 0) {
> +	while ((pmu = perf_pmu__scan(pmu)) != NULL)
> +		if (pmu->type == evsel->attr.type) {
> +			found = true;
> +			break;
> +		}
> +
> +	if (found)
> +		perf_pmu__scan_file(pmu, "nr_addr_filters",
> +				    "%d", &nr_addr_filters);
> +
> +	if (!nr_addr_filters)
> +		goto err;
> +
> +	if (perf_evsel__append_addr_filter(evsel, str) < 0) {
>  		fprintf(stderr,
>  			"not enough memory to hold filter string\n");
>  		return -1;
>  	}
>  
>  	return 0;
> +
> +err:
> +	fprintf(stderr,
> +		"--filter option should follow a -e tracepoint or HW tracer option\n");
> +
> +	return -1;
>  }
>  
>  int parse_filter(const struct option *opt, const char *str,
>