linux-kernel - Re: [PATCH 01/10] perf, tools, stat: Factor out callback for collecting event values

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Date:   Sun, 5 Mar 2017 18:01:24 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 01/10] perf, tools, stat: Factor out callback for
 collecting event values

On Fri, Mar 03, 2017 at 03:16:11PM -0800, Andi Kleen wrote:
> On Fri, Mar 03, 2017 at 11:33:03AM +0100, Jiri Olsa wrote:
> > On Tue, Feb 28, 2017 at 10:49:15PM -0800, Andi Kleen wrote:
> > 
> > SNIP
> > 
> > > +static void collect_data(struct perf_evsel *counter,
> > > +			    void (*cb)(struct perf_evsel *counter, void *data,
> > > +				       bool first),
> > > +			    void *data)
> > > +{
> > > +	cb(counter, data, true);
> > > +}
> > > +
> > > +struct aggr_data {
> > > +	u64 ena, run, val;
> > > +	int id;
> > > +	int nr;
> > > +	int cpu;
> > > +};
> > > +
> > > +static void aggr_cb(struct perf_evsel *counter, void *data, bool first)
> > > +{
> > > +	struct aggr_data *ad = data;
> > > +	int cpu, cpu2, s2;
> > > +
> > > +	for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
> > > +		struct perf_counts_values *counts;
> > > +
> > > +		cpu2 = perf_evsel__cpus(counter)->map[cpu];
> > > +		s2 = aggr_get_id(evsel_list->cpus, cpu2);
> > 
> > that does not match the removed code.. why?
> >                 s2 = aggr_get_id(perf_evsel__cpus(counter), cpu);
> 
> I added it at some point during debugging. I think it's
> actually a nop here, but technically it's correct (we're
> always supposed to remap)
> 
> I can remove it, but it's really a small code cleanup.

please do, thanks

jirka