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 15:06:59 +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
> 
>> +}
>> +
>>  static int record__mmap_evlist(struct record *rec,
>>  			       struct evlist *evlist)
>>  {
>> @@ -1383,6 +1417,12 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>>  	session->header.env.comp_type  = PERF_COMP_ZSTD;
>>  	session->header.env.comp_level = rec->opts.comp_level;
>>  
>> +	if (rec->opts.kcore &&
>> +	    !record__kcore_readable(&session->machines.host)) {
>> +		pr_err("ERROR: kcore is not readable.\n");
>> +		return -1;
>> +	}
>> +
> 
> is there any reason why this change is not merged with the change below?

It seemed better to do the validation before opening all the events.

> 
> 
>>  	record__init_features(rec);
>>  
>>  	if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
>> @@ -1414,6 +1454,14 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>>  	}
>>  	session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
>>  
>> +	if (rec->opts.kcore) {
>> +		err = record__kcore_copy(&session->machines.host, data);
>> +		if (err) {
>> +			pr_err("ERROR: Failed to copy kcore\n");
>> +			goto out_child;
>> +		}
>> +	}
>> +
> 
> thanks,
> jirka
>