linux-kernel - Re: [RFC] perf_sample

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Message-ID: <20190819143034.GC29674@kernel.org>
Date:   Mon, 19 Aug 2019 11:30:34 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] perf_sample_id::idx

Em Mon, Aug 12, 2019 at 12:09:35PM +0300, Adrian Hunter escreveu:
> On 9/08/19 7:04 PM, Arnaldo Carvalho de Melo wrote:
> > Em Fri, Aug 09, 2019 at 03:20:14PM +0000, Hunter, Adrian escreveu:
> > 
> >> It will be used for AUX area sampling.  A sample will have AUX area
> >> data that will be queued for decoding, where there are separate queues
> >> for each CPU (per-cpu tracing) or task (per-thread tracing).  The
> >> sample ID can be used to lookup 'idx' which is effectively the queue
> >> number.
> > 
> > Would be good to have this as a comment in the perf_sample_id struct
> > definition :-)

Thanks, applied to perf/core.
 
> 
> >From 45d57bd7b25c9864f21e25534274ea461ff83d9d Mon Sep 17 00:00:00 2001
> From: Adrian Hunter <adrian.hunter@...el.com>
> Date: Mon, 12 Aug 2019 12:06:31 +0300
> Subject: [PATCH] perf tools: Add comment for idx in struct perf_sample_id
> 
> 'idx' was added as preparation for AUX area sampling. Add a comment to
> describe why.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/evsel.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index cad54e8ba522..ba13eb771775 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -22,6 +22,13 @@ struct perf_sample_id {
>  	struct hlist_node 	node;
>  	u64		 	id;
>  	struct perf_evsel	*evsel;
> +	/*
> +	 * 'idx' will be used for AUX area sampling. A sample will have AUX area
> +	 * data that will be queued for decoding, where there are separate
> +	 * queues for each CPU (per-cpu tracing) or task (per-thread tracing).
> +	 * The sample ID can be used to lookup 'idx' which is effectively the
> +	 * queue number.
> +	 */
>  	int			idx;
>  	int			cpu;
>  	pid_t			tid;
> -- 
> 2.17.1

-- 

- Arnaldo