linux-kernel - Re: [PATCH 5/5] perf record: Put a copy of kcore into the perf.data directory

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Date:   Mon, 7 Oct 2019 15:14:54 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] perf record: Put a copy of kcore into the perf.data
 directory

On 7/10/19 2:20 PM, Jiri Olsa wrote:
> On Fri, Oct 04, 2019 at 11:31:21AM +0300, Adrian Hunter wrote:
> 
> SNIP
> 
>>  	bool	      strict_freq;
>>  	bool	      sample_id;
>>  	bool	      no_bpf_event;
>> +	bool	      kcore;
>>  	unsigned int  freq;
>>  	unsigned int  mmap_pages;
>>  	unsigned int  auxtrace_mmap_pages;
>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
>> index 061bb4d6a3f5..bfa80fe8d369 100644
>> --- a/tools/perf/util/session.c
>> +++ b/tools/perf/util/session.c
>> @@ -230,6 +230,10 @@ struct perf_session *perf_session__new(struct perf_data *data,
>>  			if (ret)
>>  				goto out_delete;
>>  			}
>> +
>> +			if (!symbol_conf.kallsyms_name &&
>> +			    !symbol_conf.vmlinux_name)
>> +				symbol_conf.kallsyms_name = perf_data__kallsyms_name(data);
> 
> hum, should this also depend on rec->opts.kcore ?

This is the bit that makes 'perf script' work.  It has the same affect as
though the --kallsyms option was used. i.e. it makes 'perf script' behave
the same as:
	
	perf script --kallsyms perf.data/kcore_dir/kallsyms

Which works because perf looks for kcore in the same directory as kallsyms.