linux-kernel - Re: [PATCH v3 6/8] perf session: Move event read code to separate function

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Date:   Fri, 8 Oct 2021 09:33:57 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: Re: [PATCH v3 6/8] perf session: Move event read code to separate
 function

On Thu, Oct 07, 2021 at 01:25:41PM +0300, Alexey Bayduraev wrote:

SNIP

>  static int
> -reader__process_events(struct reader *rd, struct perf_session *session,
> -		       struct ui_progress *prog)
> +reader__read_event(struct reader *rd, struct perf_session *session,
> +		   struct ui_progress *prog)
>  {
>  	u64 size;
>  	int err = 0;
>  	union perf_event *event;
>  	s64 skip;
>  
> -	err = reader__init(rd, &session->one_mmap);
> -	if (err)
> -		goto out;
> -
> -remap:
> -	err = reader__mmap(rd, session);
> -	if (err)
> -		goto out;
> -
> -more:
>  	event = fetch_mmaped_event(rd->head, rd->mmap_size, rd->mmap_cur,
>  				   session->header.needs_swap);
>  	if (IS_ERR(event))
>  		return PTR_ERR(event);
>  
>  	if (!event)
> -		goto remap;
> +		return 1;
>  
>  	session->active_decomp = &rd->decomp_data;
>  	size = event->header.size;
> @@ -2311,6 +2301,33 @@ reader__process_events(struct reader *rd, struct perf_session *session,
>  
>  	ui_progress__update(prog, size);
>  
> +out:
> +	session->active_decomp = &session->decomp_data;
> +	return err;
> +}
> +
> +static int
> +reader__process_events(struct reader *rd, struct perf_session *session,
> +		       struct ui_progress *prog)
> +{
> +	int err;
> +
> +	err = reader__init(rd, &session->one_mmap);
> +	if (err)
> +		goto out;
> +
> +remap:
> +	err = reader__mmap(rd, session);
> +	if (err)
> +		goto out;
> +
> +more:
> +	err = reader__read_event(rd, session, prog);
> +	if (err < 0)
> +		goto out;
> +	else if (err == 1)
> +		goto remap;
> +
>  	if (session_done())
>  		goto out;
>  
> @@ -2318,7 +2335,6 @@ reader__process_events(struct reader *rd, struct perf_session *session,
>  		goto more;
>  
>  out:
> -	session->active_decomp = &session->decomp_data;

active_decomp should be set/unset within reader__process_events,
not just for single event read, right?

jirka

>  	return err;
>  }
>  
> -- 
> 2.19.0
>