linux-kernel - Re: [PATCH V5 2/3] perf tools: parse the pmu event prefix and surfix

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Date:	Thu, 11 Sep 2014 15:37:11 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	"acme@...nel.org" <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH V5 2/3] perf tools: parse the pmu event prefix and surfix

On Thu, Sep 11, 2014 at 01:31:48PM +0000, Liang, Kan wrote:
> 
> 
> > SNIP
> > 
> > >  	return 0;
> > >  }
> > >
> > > +static int
> > > +comp_pmu(const void *p1, const void *p2) {
> > > +	struct perf_pmu_event_symbol *pmu1 =
> > > +			(struct perf_pmu_event_symbol *) p1;
> > > +	struct perf_pmu_event_symbol *pmu2 =
> > > +			(struct perf_pmu_event_symbol *) p2;
> > > +
> > > +	return strcmp(pmu1->symbol, pmu2->symbol); }
> > > +
> > > +/*
> > > + * Read the pmu events list from sysfs
> > > + * Save it into perf_pmu_events_list
> > > + */
> > > +static void perf_pmu__parse_init(void) {
> > > +
> > > +	struct perf_pmu *pmu = NULL;
> > > +	struct perf_pmu_alias *alias;
> > > +	int len = 0;
> > > +
> > 
> > missing my previous comment being addressed:
> >
> 
> I just found it in Junk E-mail. I have no idea why. :(
>  
> > ---
> > Why do we need to call scan here? Looks like:
> >   pmu = pmu_lookup("cpu")
> > 
> > should be enough.. and could be used below as well
> > ---
> >
> 
> Could we use "perf_pmu__find" here?
> pmu_lookup is a static function.
> Also, it looks we don't need to lookup all the time if the PMU is loaded.

right, perf_pmu__find seems better

thanks,
jirka
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