linux-kernel - Re: [PATCH 2/6] perf, tools, stat: Implement CSV metrics output

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Message-ID: <20160229144359.GA29553@kernel.org>
Date:	Mon, 29 Feb 2016 11:43:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, jolsa@...nel.org,
	eranian@...gle.com, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/6] perf, tools, stat: Implement CSV metrics output

Em Mon, Feb 29, 2016 at 11:20:48AM +0100, Jiri Olsa escreveu:
> On Fri, Feb 26, 2016 at 04:27:57PM -0800, Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > Now support CSV output for metrics. With the new output callbacks
> > this is relatively straight forward by creating new callbacks.
> > 
> > This allows to easily plot metrics from CSV files.
> > 
> > The new line callback needs to know the number of fields to skip them
> > correctly
> > 
> > Example output before:
> > 
> > % perf stat -x, true
> > 0.200687,,task-clock,200687,100.00
> > 0,,context-switches,200687,100.00
> > 0,,cpu-migrations,200687,100.00
> > 40,,page-faults,200687,100.00
> > 730871,,cycles,203601,100.00
> > 551056,,stalled-cycles-frontend,203601,100.00
> > <not supported>,,stalled-cycles-backend,0,100.00
> > 385523,,instructions,203601,100.00
> > 78028,,branches,203601,100.00
> > 3946,,branch-misses,203601,100.00
> > 
> > After:
> > 
> > % perf stat -x, true
> > .502457,,task-clock,502457,100.00,0.485,CPUs utilized
> > 0,,context-switches,502457,100.00,0.000,K/sec
> > 0,,cpu-migrations,502457,100.00,0.000,K/sec
> > 45,,page-faults,502457,100.00,0.090,M/sec
> > 644692,,cycles,509102,100.00,1.283,GHz
> > 423470,,stalled-cycles-frontend,509102,100.00,65.69,frontend cycles idle
> > <not supported>,,stalled-cycles-backend,0,100.00,,,,
> > 492701,,instructions,509102,100.00,0.76,insn per cycle
> > ,,,,,0.86,stalled cycles per insn
> > 97767,,branches,509102,100.00,194.578,M/sec
> > 4788,,branch-misses,509102,100.00,4.90,of all branches
> > 
> > Two new fields are added: metric value and metric name.
> 
> I'm still getting the empty line:

Ditto here.
 
> 	[jolsa@...va perf]$ ./perf stat -x, true
> 	0.389590,,task-clock,389590,100.00,0.479,CPUs utilized
> 	0,,context-switches,389590,100.00,0.000,K/sec
> 	0,,cpu-migrations,389590,100.00,0.000,K/sec
> 	43,,page-faults,389590,100.00,0.110,M/sec
> 	536038,,cycles,393283,100.00,1.376,GHz
> 	429548,,instructions,393283,100.00,0.80,insn per cycle
> 	,,,,,,,,
> 	85012,,branches,393283,100.00,218.209,M/sec
> 	3600,,branch-misses,393283,100.00,4.23,of all branches
> 
> it's not enough just not to include stalled cycles events
> in case they are not supported, like you do in patch 1
> 
> perf_stat__print_shadow_stats prints stalled cycles
> data within instruction event case, so you need to check
> for stalled cycles in evlist in there
> 
> we have pointer to the evlist in each evsel, so it should be easy
> 
> thanks,
> jirka