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

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Date:   Mon, 23 Dec 2019 10:02:02 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        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 Mon, Dec 23, 2019 at 08:55:00AM +0800, Jin, Yao escreveu:
> 
> 
> On 12/21/2019 12:34 AM, Arnaldo Carvalho de Melo wrote:
> > 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")
> 
> Yes, I should add this in patch description. Thanks for reminding
> 
> Do you need me to resend this patch-set (v7)?

Nope, I added it myself, thanks.

- Arnaldo
 
> Thanks
> Jin Yao
> 
> > >   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