linux-kernel - Re: [PATCH 2/5] tools, perf: Add support to evsel for enabling counters

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Message-ID: <87eha81qzl.fsf@sejong.aot.lge.com>
Date:	Mon, 05 Aug 2013 17:28:14 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...radead.org, eranian@...gle.com, jolsa@...hat.com,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/5] tools, perf: Add support to evsel for enabling counters

Hi Andi,

On Fri,  2 Aug 2013 17:41:10 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
>
> Add support for enabling already set up counters by using an
> ioctl. I share some code with the filter setup.
>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/evsel.c | 21 ++++++++++++++++++---
>  tools/perf/util/evsel.h |  1 +
>  2 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index c9c7494..60e0d84 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -605,16 +605,16 @@ int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
>  	return evsel->fd != NULL ? 0 : -ENOMEM;
>  }
>  
> -int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
> -			   const char *filter)
> +static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
> +			  int ioc,  void *arg)
>  {
>  	int cpu, thread;
>  
>  	for (cpu = 0; cpu < ncpus; cpu++) {
>  		for (thread = 0; thread < nthreads; thread++) {
>  			int fd = FD(evsel, cpu, thread),
> -			    err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
>  
> +			err = ioctl(fd, ioc, arg);

Looks very strange to have a blank line between variable declarations.
You'd better separating declarations on the other lines like:

			int fd, err;

			fd = FD(evsel, cpu, thread);
			err = ioctl(fd, ioc, arg);

Thanks,
Namhyung


>  			if (err)
>  				return err;
>  		}
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