linux-kernel - Re: [PATCH v2 2/8] perf tools: Introduce perf_hpp__setup_hists

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Date:	Mon, 7 Mar 2016 14:15:02 +0100
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 <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH v2 2/8] perf tools: Introduce
 perf_hpp__setup_hists_formats()

On Mon, Mar 07, 2016 at 09:59:34PM +0900, Namhyung Kim wrote:
> On Sun, Mar 06, 2016 at 07:43:25PM +0100, Jiri Olsa wrote:
> > On Fri, Mar 04, 2016 at 11:59:36PM +0900, Namhyung Kim wrote:
> > 
> > SNIP
> > 
> > >  
> > > @@ -2133,8 +2134,19 @@ static void hists__delete_all_entries(struct hists *hists)
> > >  static void hists_evsel__exit(struct perf_evsel *evsel)
> > >  {
> > >  	struct hists *hists = evsel__hists(evsel);
> > > +	struct perf_hpp_fmt *fmt, *pos;
> > > +	struct perf_hpp_list_node *node;
> > >  
> > >  	hists__delete_all_entries(hists);
> > > +
> > > +	list_for_each_entry(node, &hists->hpp_formats, list) {
> > > +		perf_hpp_list__for_each_format_safe(&node->hpp, fmt, pos) {
> > > +			list_del(&fmt->list);
> > > +			free(fmt);
> > > +		}
> > > +		list_del(&node->list);
> > > +		free(node);
> > > +	}
> > >  }
> > >  
> > >  static int hists_evsel__init(struct perf_evsel *evsel)
> > > diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
> > > index f4ef513527ba..3cab9dc20822 100644
> > > --- a/tools/perf/util/hist.h
> > > +++ b/tools/perf/util/hist.h
> > > @@ -78,6 +78,7 @@ struct hists {
> > >  	u16			col_len[HISTC_NR_COLS];
> > >  	int			socket_filter;
> > >  	struct perf_hpp_list	*hpp_list;
> > > +	struct list_head	hpp_formats;
> > 
> > I've been thinking.. should hpp_formats and hpp_list be merged? something like:
> > 
> > struct perf_hpp_list {
> > 	struct list_head nodes;
> > 	int levels;
> > }
> > 
> > sturct perf_hpp_list_node {
> > 	int level;
> > 	struct list_head fields;
> > 	struct list_head sorts;
> > 	int nr_sort_keys;
> > };
> > 
> > it seems wrong to me that your hierarchy code and current one
> > got in separate paths.. we could have the new hierarchy support
> > struct above being used in current non-hierarchy code just
> > by using single level
> > 
> > I haven't thought all this through.. just an idea ;-)
> 
> Yes, I also think that we need to converge on the same data structure
> eventually.  But I think it's too intrusive to be merged at once.
> Also keeping up with the latest perf changes is a PITA.  ;-)

heh, amen ;-)

> 
> So I decided to use it on the hierarchy first, and get tested in the
> wild for some time.  After that we can convert the non-hierarchy code
> to use same path and data structure gradually IMHO.

ok, let's keep it in mind at least..

thanks.
jirka