linux-kernel - Re: [PATCH 06/10] perf tools: Try to show pretty printed output for dynamic sort keys

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Date:	Mon, 21 Dec 2015 17:36:07 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 06/10] perf tools: Try to show pretty printed output for
 dynamic sort keys

Hi Jiri,

On Sun, Dec 20, 2015 at 03:12:45PM +0100, Jiri Olsa wrote:
> On Wed, Dec 16, 2015 at 12:35:39AM +0900, Namhyung Kim wrote:
> 
> SNIP
> 
> >  	struct trace_seq seq;
> > +	char *str, *pos;
> > +	struct format_field *field;
> > +	struct pevent_record rec = {
> > +		.cpu  = he->cpu,
> > +		.data = he->raw_data,
> > +		.size = he->raw_size,
> > +	};
> > +	size_t namelen;
> >  	int ret;
> >  
> >  	hde = container_of(fmt, struct hpp_dynamic_entry, hpp);
> > @@ -1605,9 +1654,28 @@ static int __sort__hde_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
> >  	if (hists_to_evsel(he->hists) != hde->evsel)
> >  		return scnprintf(hpp->buf, hpp->size, "%*.*s", len, len, "N/A");
> >  
> > +	field = hde->field;
> >  	trace_seq_init(&seq);
> > -	print_event_field(&seq, he->raw_data, hde->field);
> > -	ret = scnprintf(hpp->buf, hpp->size, "%*.*s", len, len, seq.buffer);
> > +	pevent_event_info(&seq, field->event, &rec);
> 
> hm, maybe we could cache the seq.buffer data in hist_entry?
> 
> IIRC pevent_event_info code does a lot of stuff, so
> it might be better to call it just once.. caching
> its results in hist_entry seems like small price

Right.  I did the same thing for 'trace' sort key, so will move it to
here.

Thanks,
Namhyung


> 
> > +
> > +	namelen = strlen(field->name);
> > +	str = strtok_r(seq.buffer, " ", &pos);
> > +	while (str) {
> > +		if (!strncmp(str, field->name, namelen)) {
> > +			str += namelen + 1;
> > +			break;
> > +		}
> > +
> > +		str = strtok_r(NULL, " ", &pos);
> > +	}
> > +
> 
> SNIP
> 
--
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