linux-kernel - Re: [PATCH 04/10] perf, tools: Support per pmu json aliases

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Date:   Fri, 14 Oct 2016 14:31:59 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, sukadev@...ux.vnet.ibm.com,
        eranian@...gle.com, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 04/10] perf, tools: Support per pmu json aliases

On Thu, Oct 13, 2016 at 02:15:26PM -0700, 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.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/pmu.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 363cb7b0ccc7..f8a052a793b1 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -509,7 +509,7 @@ char * __weak get_cpuid_str(void)
>   * to the current running CPU. Then, add all PMU events from that table
>   * as aliases.
>   */
> -static void pmu_add_cpu_aliases(struct list_head *head)
> +static void pmu_add_cpu_aliases(struct list_head *head, const char *name)
>  {
>  	int i;
>  	struct pmu_events_map *map;
> @@ -575,6 +575,7 @@ static struct perf_pmu *pmu_lookup(const char *name)
>  	LIST_HEAD(format);
>  	LIST_HEAD(aliases);
>  	__u32 type;
> +	int noff = 0;
>  
>  	/*
>  	 * The pmu data we store & need consists of the pmu
> @@ -584,15 +585,16 @@ 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;
>  
> -	if (!strcmp(name, "cpu"))
> -		pmu_add_cpu_aliases(&aliases);
> -
> -	if (pmu_type(name, &type))
> +	if (pmu_aliases(name, &aliases))
>  		return NULL;
>  
> +	if (!strncmp(name, "uncore_", 7))
> +		noff = 7;


please do this (best in a function) within pmu_add_cpu_aliases
in the check itself:

                if (pe->pmu && strncmp(pe->pmu, name, strlen(pe->pmu)))
                        continue;

Also any chance the json Unit field could have a uncore prefix already?

would be nice to see more info about those fields in changelog

thanks,
jirka