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

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Date:   Wed, 27 Feb 2019 14:25:50 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.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 Wed, Feb 27, 2019 at 09:04:21PM +0800, Jin, Yao wrote:
> 
> 
> 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);
> 	....
> }

anything that would make this more clear/readable ;-)

thanks,
jirka