linux-kernel - Re: [PATCH 2/7] perf hist: Introduce hists__link

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Date:   Mon, 19 Sep 2016 09:59:54 +0200
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 <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 2/7] perf hist: Introduce hists__link_hierarchy()

On Tue, Sep 13, 2016 at 04:45:47PM +0900, Namhyung Kim wrote:
> The hists__link_hierarchy() is to support hierarchy report with event
> group.  When it matches leader event and other members (with the
> hists__match_hierarchy), it also needs to link unmatched member entries
> with a dummy leader event so that it can show up in the output.

SNIP

>  
> +static int hists__link_hierarchy(struct hists *leader_hists,
> +				 struct hist_entry *parent,
> +				 struct rb_root *leader_root,
> +				 struct rb_root *other_root)
> +{
> +	struct rb_node *nd;
> +	struct hist_entry *pos, *leader;
> +
> +	for (nd = rb_first(other_root); nd; nd = rb_next(nd)) {
> +		pos = rb_entry(nd, struct hist_entry, rb_node_in);
> +
> +		if (hist_entry__has_pairs(pos)) {
> +			bool found = false;
> +
> +			list_for_each_entry(leader, &pos->pairs.head, pairs.node) {
> +				if (leader->hists == leader_hists) {
> +					found = true;
> +					break;
> +				}
> +			}
> +			if (!found)
> +				return -1;
> +		} else {
> +			leader = add_dummy_hierarchy_entry(leader_hists,
> +							   leader_root, pos);

could we call hists__add_dummy_entry in here? seems like there's only
difference in function arguments.. we could safe one function ;-)

thanks,
jirka