linux-kernel - Re: [PATCH v2 2/2] perf annotate: Support interactive annotation of code without symbols

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Date:   Sun, 23 Feb 2020 20:50:30 +0100
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 2/2] perf annotate: Support interactive annotation of
 code without symbols

On Sat, Feb 22, 2020 at 07:37:49AM +0800, Jin, Yao wrote:
> 
> 
> On 2/21/2020 10:45 PM, Jiri Olsa wrote:
> > On Fri, Feb 21, 2020 at 10:46:08AM +0800, Jin Yao wrote:
> > 
> > SNIP
> > 
> > > 
> > > Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> > > ---
> > >   tools/perf/ui/browsers/hists.c | 51 +++++++++++++++++++++++++++++-----
> > >   tools/perf/util/annotate.h     |  2 ++
> > >   2 files changed, 46 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> > > index f36dee499320..5144528b2931 100644
> > > --- a/tools/perf/ui/browsers/hists.c
> > > +++ b/tools/perf/ui/browsers/hists.c
> > > @@ -2465,13 +2465,47 @@ do_annotate(struct hist_browser *browser, struct popup_action *act)
> > >   	return 0;
> > >   }
> > > +static struct symbol *new_annotate_sym(u64 addr, struct map *map,
> > > +				       struct annotation_options *opts)
> > > +{
> > > +	struct symbol *sym;
> > > +	struct annotated_source *src;
> > > +	char name[64];
> > > +
> > > +	snprintf(name, sizeof(name), "%-#.*lx", BITS_PER_LONG / 4, addr);
> > > +
> > > +	sym = symbol__new(addr,
> > > +			  opts->annotate_dummy_len ?
> > > +			  opts->annotate_dummy_len : ANNOTATION_DUMMY_LEN,
> > 
> > I can't see annotate_dummy_len being set anywhere..
> > 
> 
> Yes, annotate_dummy_len is not set in this patch. Currently we just use the
> default value. While maybe in future we will provide a perf report option or
> set it in perf config. Now I just leave an interface here.

if that's just 'maybe in future we will provide' then please keep just the
ANNOTATION_DUMMY_LEN, the abandoned opts->annotate_dummy_len var is confusing 

thanks,
jirka