linux-kernel - Re: [PATCH 5/8] perf/core: Set data->sample_flags in perf_prepare

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Date:   Fri, 13 Jan 2023 12:20:08 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, Song Liu <song@...nel.org>
Subject: Re: [PATCH 5/8] perf/core: Set data->sample_flags in
 perf_prepare_sample()

On Thu, Jan 12, 2023 at 01:40:12PM -0800, Namhyung Kim wrote:

> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -7053,6 +7053,14 @@ static void perf_aux_sample_output(struct perf_event *event,
>  	ring_buffer_put(rb);
>  }
>  
> +/*
> + * A set of common sample data types saved even for non-sample records
> + * when event->attr.sample_id_all is set.
> + */
> +#define PERF_SAMPLE_ID_ALL  (PERF_SAMPLE_TID | PERF_SAMPLE_TIME |	\
> +			     PERF_SAMPLE_CPU | PERF_SAMPLE_ID |		\
> +			     PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_STREAM_ID)
> +


>  	__perf_event_header__init_id(header, data, event, filtered_sample_type);
> +	data->sample_flags |= sample_type & PERF_SAMPLE_ID_ALL;

Why not update __perf_event_header__init_id() ?