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

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Date:   Mon, 24 Feb 2020 08:28:10 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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 2/24/2020 3:50 AM, Jiri Olsa wrote:
> 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
> 

OK, I will keep just the ANNOTATION_DUMMY_LEN and remove the 
opts->annotate_dummy_len in next version.

Thanks
Jin Yao