linux-kernel - Re: [PATCH v6 08/10] perf metricgroup: Support printing metric groups for system PMUs

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Message-ID: <20201207172319.GD129853@kernel.org>
Date:   Mon, 7 Dec 2020 14:23:19 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, will@...nel.org, mathieu.poirier@...aro.org,
        leo.yan@...aro.org, irogers@...gle.com, qiangqing.zhang@....com,
        kjain@...ux.ibm.com, linux-kernel@...r.kernel.org,
        zhangshaokun@...ilicon.com, linux-arm-kernel@...ts.infradead.org,
        linuxarm@...wei.com, kan.liang@...ux.intel.com,
        kim.phillips@....com, ak@...ux.intel.com
Subject: Re: [PATCH v6 08/10] perf metricgroup: Support printing metric
 groups for system PMUs

Em Fri, Dec 04, 2020 at 07:10:14PM +0800, John Garry escreveu:
> Currently printing metricgroups for core- or uncore-based events matched
> by CPUID is supported.
> 
> Extend this for system events.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> Acked-by: Kajol Jain <kjain@...ux.ibm.com>
> ---
>  tools/perf/util/metricgroup.c | 64 ++++++++++++++++++++++++++++++++---
>  1 file changed, 60 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 4c6a686b08eb..abc5d0e28d0f 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -559,6 +559,49 @@ static int metricgroup__print_pmu_event(struct pmu_event *pe,
>  	return 0;
>  }
>  
> +struct metricgroup_print_sys_idata {
> +	struct strlist *metriclist;
> +	bool metricgroups;
> +	char *filter;
> +	bool raw;
> +	bool details;
> +	struct rblist *groups;
> +};

I'm doing some reorg to avoid these holes:

[acme@...e perf]$ pahole -C metricgroup_print_sys_idata ~/bin/perf
struct metricgroup_print_sys_idata {
	struct strlist *           metriclist;           /*     0     8 */
	_Bool                      metricgroups;         /*     8     1 */

	/* XXX 7 bytes hole, try to pack */

	char *                     filter;               /*    16     8 */
	_Bool                      raw;                  /*    24     1 */
	_Bool                      details;              /*    25     1 */

	/* XXX 6 bytes hole, try to pack */

	struct rblist *            groups;               /*    32     8 */

	/* size: 40, cachelines: 1, members: 6 */
	/* sum members: 27, holes: 2, sum holes: 13 */
	/* last cacheline: 40 bytes */
};
[acme@...e perf]$

It ended up as:

[acme@...e perf]$ pahole -C metricgroup_print_sys_idata ~/bin/perf
struct metricgroup_print_sys_idata {
	struct strlist *           metriclist;           /*     0     8 */
	char *                     filter;               /*     8     8 */
	struct rblist *            groups;               /*    16     8 */
	_Bool                      metricgroups;         /*    24     1 */
	_Bool                      raw;                  /*    25     1 */
	_Bool                      details;              /*    26     1 */

	/* size: 32, cachelines: 1, members: 6 */
	/* padding: 5 */
	/* last cacheline: 32 bytes */
};
[acme@...e perf]$o

- Arnaldo

> +typedef int (*metricgroup_sys_event_iter_fn)(struct pmu_event *pe, void *);
> +
> +struct metricgroup_iter_data {
> +	metricgroup_sys_event_iter_fn fn;
> +	void *data;
> +};
> +
> +static int metricgroup__sys_event_iter(struct pmu_event *pe, void *data)
> +{
> +	struct metricgroup_iter_data *d = data;
> +	struct perf_pmu *pmu = NULL;
> +
> +	if (!pe->metric_expr || !pe->compat)
> +		return 0;
> +
> +	while ((pmu = perf_pmu__scan(pmu))) {
> +
> +		if (!pmu->id || strcmp(pmu->id, pe->compat))
> +			continue;
> +
> +		return d->fn(pe, d->data);
> +	}
> +
> +	return 0;
> +}
> +
> +static int metricgroup__print_sys_event_iter(struct pmu_event *pe, void *data)
> +{
> +	struct metricgroup_print_sys_idata *d = data;
> +
> +	return metricgroup__print_pmu_event(pe, d->metricgroups, d->filter, d->raw,
> +				     d->details, d->groups, d->metriclist);
> +}
> +
>  void metricgroup__print(bool metrics, bool metricgroups, char *filter,
>  			bool raw, bool details)
>  {
> @@ -569,9 +612,6 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
>  	struct rb_node *node, *next;
>  	struct strlist *metriclist = NULL;
>  
> -	if (!map)
> -		return;
> -
>  	if (!metricgroups) {
>  		metriclist = strlist__new(NULL, NULL);
>  		if (!metriclist)
> @@ -582,7 +622,7 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
>  	groups.node_new = mep_new;
>  	groups.node_cmp = mep_cmp;
>  	groups.node_delete = mep_delete;
> -	for (i = 0; ; i++) {
> +	for (i = 0; map; i++) {
>  		pe = &map->table[i];
>  
>  		if (!pe->name && !pe->metric_group && !pe->metric_name)
> @@ -595,6 +635,22 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
>  			return;
>  	}
>  
> +	{
> +		struct metricgroup_iter_data data = {
> +			.fn = metricgroup__print_sys_event_iter,
> +			.data = (void *) &(struct metricgroup_print_sys_idata){
> +				.metriclist = metriclist,
> +				.metricgroups = metricgroups,
> +				.filter = filter,
> +				.raw = raw,
> +				.details = details,
> +				.groups = &groups,
> +			},
> +		};
> +
> +		pmu_for_each_sys_event(metricgroup__sys_event_iter, &data);
> +	}
> +
>  	if (!filter || !rblist__empty(&groups)) {
>  		if (metricgroups && !raw)
>  			printf("\nMetric Groups:\n\n");
> -- 
> 2.26.2
> 

-- 

- Arnaldo