linux-kernel - Re: [PATCH 2/2] perf,tools: check and re-organize evsel cpu maps

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Date:	Tue, 30 Jun 2015 15:54:49 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	"acme@...nel.org" <acme@...nel.org>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"eranian@...gle.com" <eranian@...gle.com>,
	"Hunter, Adrian" <adrian.hunter@...el.com>,
	"dsahern@...il.com" <dsahern@...il.com>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] perf,tools: check and re-organize evsel cpu maps

On Tue, Jun 30, 2015 at 01:42:49PM +0000, Liang, Kan wrote:
> 
> 
> > > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index
> > > 6cfdee6..f179379 100644
> > > --- a/tools/perf/util/evlist.c
> > > +++ b/tools/perf/util/evlist.c
> > > @@ -1101,6 +1101,71 @@ int perf_evlist__mmap(struct perf_evlist
> > *evlist, unsigned int pages,
> > >  	return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);  }
> > >
> > > +static int cmp_ids(const void *a, const void *b) {
> > > +	return *(int *)a - *(int *)b;
> > > +}
> > > +
> > > +static int perf_evlist__check_evsel_cpus(struct perf_evlist *evlist,
> > > +struct perf_evsel *evsel) {
> > > +	const struct cpu_map *cpus = evlist->cpus;
> > > +	const int ncpus = cpu_map__nr(evlist->cpus);
> > > +	int j = 0, cpu_nr = 0, tmp = 0;
> > > +	int i;
> > > +
> > > +	/* ensure we process id in increasing order */
> > > +	qsort(evlist->cpus->map, evlist->cpus->nr, sizeof(int), cmp_ids);
> > 
> > wouldn't sorting maps affect some other code?
> > 
> 
> I didn't find any bad effect after sorting the maps.
> Any codes I need to check?

I dont think so, but I'm not sure either.. thats why I asked ;-)

I guess any code dealing with cpu maps.. it might affect
perf stat output.. but it looks sorted now anyway ;-)
I dont think it's an issue

jirka
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