linux-kernel - Re: [PATCH 2/3] perf hists: Link hist entries before inserting to an output tree

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Date:	Wed, 5 Dec 2012 20:15:47 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf hists: Link hist entries before inserting to an
 output tree

On Wed, Dec 05, 2012 at 08:06:46PM +0100, Jiri Olsa wrote:
> On Wed, Dec 05, 2012 at 03:56:42PM +0900, Namhyung Kim wrote:
> > From: Namhyung Kim <namhyung.kim@....com>
> > 
> 
> SNIP
> 
> > -	struct rb_node *next = rb_first(&hists->entries);
> > +	struct rb_root *root;
> > +	struct rb_node *next;
> > +
> > +	if (sort__need_collapse)
> > +		root = &hists->entries_collapsed;
> > +	else
> > +		root = hists->entries_in;
> >  
> > +	next = rb_first(root);
> >  	while (next != NULL) {
> > -		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
> > +		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
> >  
> > -		next = rb_next(&he->rb_node);
> > +		next = rb_next(&he->rb_node_in);
> >  		if (!hist_entry__next_pair(he)) {
> > -			rb_erase(&he->rb_node, &hists->entries);
> > +			rb_erase(&he->rb_node_in, root);
> >  			hist_entry__free(he);
> >  		}
> >  	}
> > @@ -481,6 +459,11 @@ static void hists__process(struct hists *old, struct hists *new)
> >  	else
> >  		hists__link(new, old);
> >  
> > +	hists__output_resort(new);
> > +
> > +	if (show_displacement)
> > +		hists__compute_position(new);
> > +
> 
> Computing the position after hists__link screws up the position data,
> because we likely have new entries in.
> 
> However, I wonder if anyone is actualy using displacement info..?

hum,

the point of the displacement is to show how far is the matching entry
in baseline wrt report output -> after hists__output_resort.. that goes
in opposite way of what we try do to in here.

Anyone else in favour of removing 'Displ.' column? ;-)

jirka
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