linux-kernel - Re: [PATCH] perf script/intel-pt: set synth_opts.callchain for use

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Date:   Tue, 11 Jun 2019 09:45:04 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Song Liu <songliubraving@...com>, linux-kernel@...r.kernel.org
Cc:     kernel-team@...com, davidca@...com,
        Milian Wolff <milian.wolff@...b.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] perf script/intel-pt: set synth_opts.callchain for
 use_browser > 0

On 11/06/19 2:42 AM, Song Liu wrote:
> Currently, intel_pt_process_auxtrace_info() sets synth_opts.callchain for
> use_browser != -1, which is not accurate after we set use_browser to 0 in
> cmd_script(). As a result, the following commands sees a lot more errors
> like:
> 
>   perf record -e intel_pt//u -C 10 -- sleep 3
>   perf script
> 
>   ...
>   instruction trace error type 1 time ...
>   ...
> 
> This patch fixes this by checking use_browser > 0 instead.
> 
> Fixes: c1c9b9695cc8 ("perf script: Allow extended console debug output")
> Reported-by: David Carrillo Cisneros <davidca@...com>
> Cc: Milian Wolff <milian.wolff@...b.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/perf/util/intel-pt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
> index 6d288237887b..15692c104ca8 100644
> --- a/tools/perf/util/intel-pt.c
> +++ b/tools/perf/util/intel-pt.c
> @@ -2588,7 +2588,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
>  	} else {
>  		itrace_synth_opts__set_default(&pt->synth_opts,
>  				session->itrace_synth_opts->default_no_sample);
> -		if (use_browser != -1) {
> +		if (use_browser > 0) {

That code has changed recently.  Refer:

	https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=26f19c2eb7e54


>  			pt->synth_opts.branches = false;
>  			pt->synth_opts.callchain = true;
>  		}
>