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 13:50:50 +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



> 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?

Thanks,
Kan
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