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 13:31:48 +0000
From:	"Liang, Kan" <kan.liang@...el.com>
To:	Jiri Olsa <jolsa@...hat.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



> 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.
 
Thanks,
Kan

> or commented why not to do it..
> 
> jirka
> 

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