linux-kernel - Re: [PATCH 04/11] perf stat: Use perf_evsel__read_cb in read

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Message-ID: <20141125093633.GC30861@krava.brq.redhat.com>
Date:	Tue, 25 Nov 2014 10:36:33 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 04/11] perf stat: Use perf_evsel__read_cb in read_counter

On Mon, Nov 24, 2014 at 06:35:33PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Fri, Nov 21, 2014 at 10:31:08AM +0100, Jiri Olsa escreveu:
> > Replacing __perf_evsel__read_on_cpu function with perf_evsel__read_cb
> > function. The read_cb callback will be used later for global aggregation
> > counter values as well.
> 
> But the changeset makes it look like there are no changes made... Can
> you elaborate here?

well the patch change the 'read_counter' function to use the
perf_evsel__read_cb instead of __perf_evsel__read_on_cpu

SNIP

> > +
> >  /*
> >   * Read out the results of a single counter:
> >   * aggregate counts across CPUs in system-wide mode
> > @@ -424,16 +444,11 @@ static int read_counter_aggr(struct perf_evsel *counter)
> >   */
> >  static int read_counter(struct perf_evsel *counter)
> >  {
> > -	u64 *count;
> >  	int cpu;
> >  
> >  	for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
> > -		if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
> > +		if (perf_evsel__read_cb(counter, cpu, 0, read_cb))

right here ^^^

> >  			return -1;
> > -
> > -		count = counter->counts->cpu[cpu].values;
> > -
> > -		update_shadow_stats(counter, count);
> >  	}
> >  
> >  	return 0;
> > -- 
> > 1.9.3
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