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

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Message-ID: <6bb8c073-4a10-8e49-05dc-819b671a875d@linux.intel.com>
Date:   Sat, 22 Feb 2020 07:37:49 +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 2/21/2020 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.

Thanks
Jin Yao

> jirka
>