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

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Date:	Mon, 12 Nov 2012 13:04:09 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	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

Em Mon, Nov 12, 2012 at 11:40:57AM +0900, Namhyung Kim escreveu:
> 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?

Right, will do.

- Arnaldo
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