linux-kernel - Re: [PATCH 10/21] perf hists: Introduce hists_

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Message-ID: <87y5i7mtl2.fsf@sejong.aot.lge.com>
Date:	Mon, 12 Nov 2012 11:40:57 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 10/21] perf hists: Introduce hists__link

On Fri,  9 Nov 2012 18:42:59 -0300, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> That given two hists will find the hist_entries (buckets) in the second
> hists that are for the same bucket in the first and link them, then it
> will look for all buckets in the second that don't have a counterpart in
> the first and will create a dummy counterpart that will then be linked
> to the entry in the second.
>
> For multiple events this will be done pairing the leader with all the
> other events in the group, so that in the end the leader will have all
> the buckets in all the hists in a group, dummy or not while the other
> hists will be left untouched.
[snip]
> +	he = hist_entry__new(pair);
> +	if (he) {
> +		he->stat.nr_events = 0;
> +		he->stat.period    = 0;

What about other fields?
Why not use "memset(&he->stat, 0, sizeof(he->stat))" for this?

Thanks,
Namhyung


> +		he->hists	   = hists;
> +		rb_link_node(&he->rb_node, parent, p);
> +		rb_insert_color(&he->rb_node, &hists->entries);
> +		hists__inc_nr_entries(hists, he);
> +	}
> +out:
> +	return he;
> +}
> +
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