linux-kernel - Re: [PATCH] perf parser: Improve error message for PMU address filters

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Message-ID: <ed218afa-f68e-205a-4d38-879615259320@mailbox.org>
Date:   Thu, 19 Oct 2017 21:37:13 +0200
From:   Jack Henschel <jackdev@...lbox.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Taeung Song <treeze.taeung@...il.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf parser: Improve error message for PMU address
 filters

On 09/05/2017 11:08 AM, Jack Henschel wrote:
> This patch improves the error message of the perf events parser
> when the PMU hardware does not support address filters.
> 
> Previously, the perf returned the following error:
>> --filter option should follow a -e tracepoint or HW tracer option
> This implies there is some syntax error present in the command line,
> which is not true. Rather, notify the user that the CPU does not have
> support for this feature.
> 
> For example, Intel chips based on the Broadwell micro-archticture have
> the Intel PT PMU, but do not support address filtering.
> 
> Signed-off-by: Jack Henschel <jackdev@...lbox.org>
> ---
>  tools/perf/util/parse-events.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index f44aeba51d1f..672b6d9423e9 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1833,8 +1833,11 @@ static int set_filter(struct perf_evsel *evsel, const void *arg)
>  	int nr_addr_filters = 0;
>  	struct perf_pmu *pmu = NULL;
>  
> -	if (evsel == NULL)
> -		goto err;
> +	if (evsel == NULL) {
> +		fprintf(stderr,
> +			"--filter option should follow a -e tracepoint or HW tracer option\n");
> +		return -1;
> +	}
>  
>  	if (evsel->attr.type == PERF_TYPE_TRACEPOINT) {
>  		if (perf_evsel__append_tp_filter(evsel, str) < 0) {
> @@ -1856,8 +1859,11 @@ static int set_filter(struct perf_evsel *evsel, const void *arg)
>  		perf_pmu__scan_file(pmu, "nr_addr_filters",
>  				    "%d", &nr_addr_filters);
>  
> -	if (!nr_addr_filters)
> -		goto err;
> +	if (!nr_addr_filters) {
> +		fprintf(stderr,
> +			"This CPU does not support address filtering\n");
> +		return -1;
> +	}
>  
>  	if (perf_evsel__append_addr_filter(evsel, str) < 0) {
>  		fprintf(stderr,
> @@ -1866,12 +1872,6 @@ static int set_filter(struct perf_evsel *evsel, const void *arg)
>  	}
>  
>  	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,
> 

Is there any interest in this patch? Did it get lost?

Greetings
Jack



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