linux-kernel - Re: [PATCH v2 1/3] perf diff: Support --time filter option

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Date:   Wed, 27 Feb 2019 21:04:21 +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 1/3] perf diff: Support --time filter option



On 2/27/2019 5:27 PM, Jiri Olsa wrote:
> On Tue, Feb 26, 2019 at 08:11:07PM +0800, Jin Yao wrote:
> 
> SNIP
> 
>> +	abstime_tmp = abstime_ostr;
>>   
>>   	data__for_each_file(i, d) {
>> -		d->session = perf_session__new(&d->data, false, &tool);
>> +		d->session = perf_session__new(&d->data, false, &pdiff.tool);
>>   		if (!d->session) {
>>   			pr_err("Failed to open %s\n", d->data.path);
>>   			ret = -1;
>>   			goto out_delete;
>>   		}
>>   
>> +		if (abstime_ostr) {
>> +			ret = parse_absolute_time(d, &abstime_tmp);
>> +			if (ret < 0)
>> +				goto out_delete;
>> +		} else if (pdiff.time_str) {
>> +			ret = parse_percent_time(d);
>> +			if (ret < 0)
>> +				goto out_delete;
>> +		} else {
>> +			pdiff.range_num = 1;
> 
> hum, why are we setting range_num to 1 again?

Yes, that may be not necessary. I will remove this line and test again.

> 
> it's really hard to parse this code, maybe
> it'd be better in separate loop/function
> that would setup just timestamps..
> 

Do you mean the above parsing code should be put in a separate function 
(e.g. parse_time_string in following example)?

data__for_each_file(i, d) {
	....
	d->session = perf_session__new(&d->data, false, &pdiff.tool);
	....
	parse_time_string(...);
	ret = perf_session__process_events(d->session);
	....
}

Thanks
Jin Yao

> 
> thanks,
> jirka
>