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 16:53:21 +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 01:50:50PM +0000, Liang, Kan wrote:
> 
> 
> > On Wed, Sep 10, 2014 at 01:55:31PM -0400, kan.liang@...el.com wrote:
> > 
> > SNIP
> > 
> > > +	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;
> > > +
> > > +	while ((pmu = perf_pmu__scan(pmu)) != NULL)
> > > +		list_for_each_entry(alias, &pmu->aliases, list) {
> > > +			if (!strcmp(pmu->name, "cpu")) {
> > > +				if (strchr(alias->name, '-'))
> > > +					len++;
> > > +				len++;
> > > +			}
> > > +	}
> > > +	if (len == 0)
> > > +		return;
> > 
> > s oif 'len' is 0 we will scan all the time? maybe we want some separate 'init'
> > variable..
> > 
> 
> Maybe we can reuse the "perf_pmu_events_list_num".
> static int perf_pmu_events_list_num;
> 
> If len is 0, we just set perf_pmu_events_list_num to -1.
> Is it OK?

seems ok

jirka
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