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Date:   Mon, 17 Jul 2023 17:41:24 +0300
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Subject: Re: [PATCH v2 5/7] perf evlist: Skip dummy event sample_type check
 for evlist_config
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To:     Yang Jihong <yangjihong1@huawei.com>, peterz@infradead.org,
        mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com,
        alexander.shishkin@linux.intel.com, jolsa@kernel.org,
        namhyung@kernel.org, irogers@google.com, kan.liang@linux.intel.com,
        james.clark@arm.com, tmricht@linux.ibm.com, ak@linux.intel.com,
        anshuman.khandual@arm.com, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org
References: <20230715032915.97146-1-yangjihong1@huawei.com>
 <20230715032915.97146-6-yangjihong1@huawei.com>
From:   Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki
In-Reply-To: <20230715032915.97146-6-yangjihong1@huawei.com>
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On 15/07/23 06:29, Yang Jihong wrote:
> The dummp event does not contain sampls data. Therefore, sample_type does
> not need to be checked.
> 
> Currently, the sample id format of the actual sampling event may be changed
> after the dummy event is added.
> 
> Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
> ---
>  tools/perf/util/record.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
> index 9eb5c6a08999..0240be3b340f 100644
> --- a/tools/perf/util/record.c
> +++ b/tools/perf/util/record.c
> @@ -128,6 +128,13 @@ void evlist__config(struct evlist *evlist, struct record_opts *opts, struct call
>  		evlist__for_each_entry(evlist, evsel) {
>  			if (evsel->core.attr.sample_type == first->core.attr.sample_type)
>  				continue;
> +
> +			/*
> +			 * Skip the sample_type check for the dummy event
> +			 * because it does not have any samples anyway.
> +			 */
> +			if (evsel__is_dummy_event(evsel))
> +				continue;

Sideband event records have "ID samples" so the sample type still matters.


>  			use_sample_identifier = perf_can_sample_identifier();
>  			break;
>  		}