linux-kernel - Re: [PATCH 13/52] perf tools: Add perf_pmu__scan

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Message-ID: <20140724140256.GV20303@kernel.org>
Date:	Thu, 24 Jul 2014 11:02:56 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 13/52] perf tools: Add perf_pmu__scan_file()

Em Thu, Jul 24, 2014 at 12:06:06PM +0200, Jiri Olsa escreveu:
> On Wed, Jul 23, 2014 at 11:25:25AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jul 23, 2014 at 11:36:38AM +0200, Jiri Olsa escreveu:
> > > On Wed, Jul 23, 2014 at 09:24:49AM +0300, Adrian Hunter wrote:
> > > > On 07/22/2014 10:09 PM, Jiri Olsa wrote:
> > > > > On Tue, Jul 22, 2014 at 04:17:22PM +0300, Adrian Hunter wrote:
> > > > > 
> > > > > SNIP
> > > > > 
> > > > >> +
> > > > >> +static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
> > > > >> +{
> > > > >> +	struct stat st;
> > > > >> +	char path[PATH_MAX];
> > > > >> +	const char *sysfs;
> > > > >> +
> > > > >> +	sysfs = sysfs__mountpoint();
> > > > >> +	if (!sysfs)
> > > > >> +		return NULL;
> > > > >> +
> > > > >> +	snprintf(path, PATH_MAX,
> > > > >> +		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
> > > > >> +
> > > > >> +	if (stat(path, &st) < 0)
> > > > >> +		return NULL;
> > > > >> +
> > > > >> +	return fopen(path, "r");
> > > > >> +}
> > > > > 
> > > > > looks like this function could be used in pmu_cpumask and pmu_type
> > > > > and maybe others
> > > > 
> > > > There is existing code duplication between them.  Given the large number of
> > > > patches I would say it is easier to deal with that separately.
> > > 
> > > ook, jirka
> > 
> > Is this an Acked-by: jirka?
> 
> well, while perf_pmu__open_file would be handy now, perf_pmu__scan_file
> does now have any callers in the patchset..
> 
> I'm not sure whats our current policy one this ;-) as I've seen more
> functions like this over this patchset, I think we should not introduce
> new interface without caller

Its a huge patchkit, with some bits non trivial, reducing it s size so
that the most hairy bits can stand out seems like a good approach at
this point. :-)

- Arnaldo
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