linux-kernel - Re: [PATCH v6 1/4] perf report: Fix incorrectly added dimensions as switch perf data file

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Date:   Fri, 20 Dec 2019 13:34:38 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v6 1/4] perf report: Fix incorrectly added dimensions as
 switch perf data file

Em Fri, Dec 20, 2019 at 09:37:19AM +0800, Jin Yao escreveu:
> We observed an issue that was some extra columns displayed after switching
> perf data file in browser. The steps to reproduce:
> 
> 1. perf record -a -e cycles,instructions -- sleep 3
> 2. perf report --group
> 3. In browser, we use hotkey 's' to switch to another perf.data
> 4. Now in browser, the extra columns 'Self' and 'Children' are displayed.
> 
> The issue is setup_sorting() executed again after repeat path, so dimensions
> are added again.
> 
> This patch checks the last key returned from __cmd_report(). If it's
> K_SWITCH_INPUT_DATA, skips the setup_sorting().

you forgot to add this right?

Cc: Feng Tang <feng.tang@...el.com>
Fixes: ad0de0971b7f ("perf report: Enable the runtime switching of perf data file")
 
>  v6:
>  ---
>  No change.
> 
>  v5:
>  ---
>  New patch in v5.
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/builtin-report.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 387311c67264..de988589d99b 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -1076,6 +1076,7 @@ int cmd_report(int argc, const char **argv)
>  	struct stat st;
>  	bool has_br_stack = false;
>  	int branch_mode = -1;
> +	int last_key = 0;
>  	bool branch_call_mode = false;
>  #define CALLCHAIN_DEFAULT_OPT  "graph,0.5,caller,function,percent"
>  	static const char report_callchain_help[] = "Display call graph (stack chain/backtrace):\n\n"
> @@ -1450,7 +1451,8 @@ int cmd_report(int argc, const char **argv)
>  		sort_order = sort_tmp;
>  	}
>  
> -	if (setup_sorting(session->evlist) < 0) {
> +	if ((last_key != K_SWITCH_INPUT_DATA) &&
> +	    (setup_sorting(session->evlist) < 0)) {
>  		if (sort_order)
>  			parse_options_usage(report_usage, options, "s", 1);
>  		if (field_order)
> @@ -1530,6 +1532,7 @@ int cmd_report(int argc, const char **argv)
>  	ret = __cmd_report(&report);
>  	if (ret == K_SWITCH_INPUT_DATA) {
>  		perf_session__delete(session);
> +		last_key = K_SWITCH_INPUT_DATA;
>  		goto repeat;
>  	} else
>  		ret = 0;
> -- 
> 2.17.1

-- 

- Arnaldo