linux-kernel - Re: [PATCH v2 4/7] perf diff: Use hists to manage basic blocks per symbol

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Date:   Tue, 11 Jun 2019 10:56:06 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v2 4/7] perf diff: Use hists to manage basic blocks per
 symbol

On Sat, Jun 08, 2019 at 07:41:47PM +0800, Jin, Yao wrote:
> 
> 
> On 6/5/2019 7:44 PM, Jiri Olsa wrote:
> > On Mon, Jun 03, 2019 at 10:36:14PM +0800, Jin Yao wrote:
> > 
> > SNIP
> > 
> > > diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> > > index 43623fa..d1641da 100644
> > > --- a/tools/perf/util/sort.h
> > > +++ b/tools/perf/util/sort.h
> > > @@ -79,6 +79,9 @@ struct hist_entry_diff {
> > >   		/* HISTC_WEIGHTED_DIFF */
> > >   		s64	wdiff;
> > > +
> > > +		/* PERF_HPP_DIFF__CYCLES */
> > > +		s64	cycles;
> > >   	};
> > >   };
> > > @@ -143,6 +146,9 @@ struct hist_entry {
> > >   	struct branch_info	*branch_info;
> > >   	long			time;
> > >   	struct hists		*hists;
> > > +	void			*block_hists;
> > > +	int			block_idx;
> > > +	int			block_num;
> > >   	struct mem_info		*mem_info;
> > >   	struct block_info	*block_info;
> > 
> > could you please not add the new block* stuff in here,
> > and instead use the "c2c model" and use yourr own struct
> > on top of hist_entry? we are trying to librarize this
> > stuff and keep only necessary things in here..
> > 
> > you're already using hist_entry_ops, so should be easy
> > 
> > something like:
> > 
> > 	struct block_hist_entry {
> > 		void			*block_hists;
> > 		int			block_idx;
> > 		int			block_num;
> > 		struct block_info	*block_info;
> > 
> > 		struct hist_entry	he;
> > 	};
> > 
> > 
> > 
> > jirka
> > 
> 
> Hi Jiri,
> 
> After more considerations, maybe I can't move these stuffs from hist_entry
> to block_hist_entry.

why?

> 
> Actually we use 2 kinds of hist_entry in this patch series. On kind of
> hist_entry is for symbol/function. The other kind of hist_entry is for basic
> block.

correct

so the way I see it the processing goes like this:


1) there's standard hist_entry processing ending up
   with evsel->hists->rb_root full of hist entries

2) then you process every hist_entry and create
   new 'struct hists' for each and fill it with
   symbol counts data



you could add 'struct hist_entry_ops' for the 1) processing
that adds the 'struct hists' object for each hist_entry

and add another 'struct hist_entry_ops' for 2) processing
to carry the block data for each hist_entry

jirka