From: Jack Henschel <jackdev@mailbox.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Andi Kleen <ak@linux.intel.com>,
Taeung Song <treeze.taeung@gmail.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf parser: Improve error message for PMU address filters
Date: Thu, 19 Oct 2017 21:37:13 +0200 [thread overview]
Message-ID: <ed218afa-f68e-205a-4d38-879615259320@mailbox.org> (raw)
In-Reply-To: <20170905090839.1619-1-jackdev@mailbox.org>
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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@mailbox.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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next prev parent reply other threads:[~2017-10-19 19:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 9:08 [PATCH] perf parser: Improve error message for PMU address filters Jack Henschel
2017-10-19 19:37 ` Jack Henschel [this message]
2017-10-19 19:57 ` Arnaldo Carvalho de Melo
2018-07-04 9:54 Jack Henschel
2018-07-04 10:24 ` Jiri Olsa
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