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

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Date:	Sun, 20 Dec 2015 15:12:45 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
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

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

jirka

> +
> +	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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