linux-kernel - Re: [PATCH 05/11] perf, tools: Support event aliases for non cpu// pmus

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Date:   Wed, 18 Jan 2017 13:10:13 +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 05/11] perf, tools: Support event aliases for non cpu//
 pmus

On Tue, Jan 03, 2017 at 07:08:27AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> The code for handling pmu aliases without specifying
> the PMU hardcoded only supported the cpu PMU.
> 
> This patch extends it to work for all PMUs. We always
> duplicate the event for all PMUs that have an matching alias.
> This allows to automatically expand an alias for all instances
> of a PMU (so for example you can monitor all cache boxes with
> a single event)
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/util/parse-events.c | 46 ++++++++++++++++++++++++------------------
>  tools/perf/util/parse-events.y | 32 ++++++++++++++++++++++-------
>  2 files changed, 51 insertions(+), 27 deletions(-)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 3c876b8ba4de..6dbcba7f0969 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1504,35 +1504,41 @@ static void perf_pmu__parse_init(void)
>  	struct perf_pmu_alias *alias;
>  	int len = 0;
>  
> -	pmu = perf_pmu__find("cpu");
> -	if ((pmu == NULL) || list_empty(&pmu->aliases)) {
> +	pmu = NULL;
> +	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
> +		list_for_each_entry(alias, &pmu->aliases, list) {
> +			if (strchr(alias->name, '-'))
> +				len++;
> +			len++;
> +		}
> +	}
> +
> +	if (len == 0) {
>  		perf_pmu_events_list_num = -1;
>  		return;
>  	}
> -	list_for_each_entry(alias, &pmu->aliases, list) {
> -		if (strchr(alias->name, '-'))
> -			len++;
> -		len++;
> -	}
>  	perf_pmu_events_list = malloc(sizeof(struct perf_pmu_event_symbol) * len);
>  	if (!perf_pmu_events_list)
>  		return;
>  	perf_pmu_events_list_num = len;
>  
>  	len = 0;
> -	list_for_each_entry(alias, &pmu->aliases, list) {
> -		struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
> -		char *tmp = strchr(alias->name, '-');
> -
> -		if (tmp != NULL) {
> -			SET_SYMBOL(strndup(alias->name, tmp - alias->name),
> -					PMU_EVENT_SYMBOL_PREFIX);
> -			p++;
> -			SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
> -			len += 2;
> -		} else {
> -			SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
> -			len++;
> +	pmu = NULL;
> +	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
> +		list_for_each_entry(alias, &pmu->aliases, list) {
> +			struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
> +			char *tmp = strchr(alias->name, '-');
> +
> +			if (tmp != NULL) {
> +				SET_SYMBOL(strndup(alias->name, tmp - alias->name),
> +						PMU_EVENT_SYMBOL_PREFIX);
> +				p++;
> +				SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
> +				len += 2;
> +			} else {
> +				SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
> +				len++;
> +			}
>  		}
>  	}
>  	qsort(perf_pmu_events_list, len,
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index 879115f93edc..f3b5ec901600 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -12,6 +12,7 @@
>  #include <linux/list.h>
>  #include <linux/types.h>
>  #include "util.h"
> +#include "pmu.h"
>  #include "parse-events.h"
>  #include "parse-events-bison.h"
>  
> @@ -236,15 +237,32 @@ PE_KERNEL_PMU_EVENT sep_dc
>  	struct list_head *head;
>  	struct parse_events_term *term;
>  	struct list_head *list;
> +	struct perf_pmu *pmu = NULL;
> +	int ok = 0;
>  
> -	ALLOC_LIST(head);
> -	ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
> -					$1, 1, &@1, NULL));
> -	list_add_tail(&term->list, head);
> -
> +	/* Add it for all PMUs that support the alias */
>  	ALLOC_LIST(list);
> -	ABORT_ON(parse_events_add_pmu(data, list, "cpu", head));
> -	parse_events_terms__delete(head);
> +	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
> +		struct perf_pmu_alias *alias;
> +
> +		list_for_each_entry(alias, &pmu->aliases, list) {
> +			if (!strcasecmp(alias->name, $1)) {
> +				ALLOC_LIST(head);
> +				ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
> +					$1, 1, &@1, NULL));
> +				list_add_tail(&term->list, head);
> +
> +				if (!parse_events_add_pmu(data, list,
> +						  pmu->name, head)) {
> +					ok++;
> +				}
> +
> +				parse_events_terms__delete(head);
> +			}
> +		}
> +	}
> +	if (!ok)
> +		YYABORT;
>  	$$ = list;
>  }
>  |
> -- 
> 2.9.3
>