linux-kernel - Re: [PATCH 03/17] perf hists: Add helper functions for hierarchy mode

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Date:	Thu, 21 Jan 2016 12:59:07 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 03/17] perf hists: Add helper functions for hierarchy mode

Hi Arnaldo,

On Wed, Jan 20, 2016 at 07:19:03PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sun, Jan 17, 2016 at 01:03:03AM +0900, Namhyung Kim escreveu:
> > The rb_hierarchy_{first,last,next,prev} functions are to traverse all
> > hist entries in a hierarchy.  They will be used by various function
> > which supports hierarchy output.
> > 
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/hist.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tools/perf/util/hist.h |  9 +++++++++
> >  2 files changed, 59 insertions(+)
> > 
> > diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> > index 931353f49c72..9354455aec5b 100644
> > --- a/tools/perf/util/hist.c
> > +++ b/tools/perf/util/hist.c
> > @@ -1390,6 +1390,56 @@ void hists__output_resort(struct hists *hists, struct ui_progress *prog)
> >  	}
> >  }
> >  
> > +struct rb_node *rb_hierarchy_first(struct rb_node *node)
> > +{
> > +	return node;
> > +}
> 
> rb_hierarchy_first() is not used in this patchkit, you end up starting
> from rb_first(&hists->entries), so I guess we can remove this one, if
> you ever need it, then reintroduce it.

Right.  I firstly thought it might be needed, but it's not.  Will remove.

Thanks,
Namhyung


> > +
> > +struct rb_node *rb_hierarchy_last(struct rb_node *node)
> > +{
> > +	struct hist_entry *he = rb_entry(node, struct hist_entry, rb_node);
> > +
> > +	while (he->unfolded && !he->leaf) {
> > +		node = rb_last(&he->hroot_out);
> > +		he = rb_entry(node, struct hist_entry, rb_node);
> > +	}
> > +	return node;
> > +}
> > +
> > +struct rb_node *rb_hierarchy_next(struct rb_node *node)
> > +{
> > +	struct hist_entry *he = rb_entry(node, struct hist_entry, rb_node);
> > +
> > +	if (!he->leaf && he->unfolded)
> > +		node = rb_first(&he->hroot_out);
> > +	else
> > +		node = rb_next(node);
> > +
> > +	while (node == NULL) {
> > +		he = he->parent_he;
> > +		if (he == NULL)
> > +			break;
> > +
> > +		node = rb_next(&he->rb_node);
> > +	}
> > +	return node;
> > +}
> > +
> > +struct rb_node *rb_hierarchy_prev(struct rb_node *node)
> > +{
> > +	struct hist_entry *he = rb_entry(node, struct hist_entry, rb_node);
> > +
> > +	node = rb_prev(node);
> > +	if (node)
> > +		return rb_hierarchy_last(node);
> > +
> > +	he = he->parent_he;
> > +	if (he == NULL)
> > +		return NULL;
> > +
> > +	return &he->rb_node;
> > +}
> > +
> >  static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *h,
> >  				       enum hist_filter filter)
> >  {
> > diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
> > index d4ec4822a103..96b7ff817d3e 100644
> > --- a/tools/perf/util/hist.h
> > +++ b/tools/perf/util/hist.h
> > @@ -381,4 +381,13 @@ int parse_filter_percentage(const struct option *opt __maybe_unused,
> >  			    const char *arg, int unset __maybe_unused);
> >  int perf_hist_config(const char *var, const char *value);
> >  
> > +#define HIERARCHY_INDENT  3
> > +
> > +int perf_hpp__count_sort_keys(void);
> > +
> > +struct rb_node *rb_hierarchy_first(struct rb_node *node);
> > +struct rb_node *rb_hierarchy_last(struct rb_node *node);
> > +struct rb_node *rb_hierarchy_next(struct rb_node *node);
> > +struct rb_node *rb_hierarchy_prev(struct rb_node *node);
> > +
> >  #endif	/* __PERF_HIST_H */
> > -- 
> > 2.6.4