linux-kernel - Re: [PATCH 04/11] perf, tools: Support per pmu json aliases

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Date:   Wed, 18 Jan 2017 12:58:55 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 04/11] perf, tools: Support per pmu json aliases

On Tue, Jan 03, 2017 at 07:08:26AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add support for registering json aliases per PMU. Any alias
> with an unit matching the prefix is registered to the PMU.
> Uncore has multiple instances of most units, so all
> these aliases get registered for each individual PMU
> (this is important later to run the event on every instance
> of the PMU).
> 
> To avoid printing the events multiple times in perf list
> filter out duplicated events during printing.
> 
> v2: Rely on uncore_ prefix already in unit
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/pmu.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 8bffe99d8e3f..4bfc98953aba 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -587,14 +587,13 @@ static struct perf_pmu *pmu_lookup(const char *name)
>  	if (pmu_format(name, &format))
>  		return NULL;
>  
> -	if (pmu_aliases(name, &aliases))
> +	if (pmu_type(name, &type))
>  		return NULL;
>  
> -	pmu_add_cpu_aliases(&aliases, name);
> -
> -	if (pmu_type(name, &type))
> +	if (pmu_aliases(name, &aliases))
>  		return NULL;
>  
> +	pmu_add_cpu_aliases(&aliases, name);

AFAICS you switched the calls.. how does it matter?

jirka

>  	pmu = zalloc(sizeof(*pmu));
>  	if (!pmu)
>  		return NULL;
> @@ -1192,6 +1191,9 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
>  	len = j;
>  	qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
>  	for (j = 0; j < len; j++) {
> +		/* Skip duplicates */
> +		if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
> +			continue;
>  		if (name_only) {
>  			printf("%s ", aliases[j].name);
>  			continue;
> -- 
> 2.9.3
>