linux-kernel - Re: [RFC PATCH 10/25] perf stat: Add helper functions to hardware-grouping method

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Date:   Tue, 26 Sep 2023 11:44:56 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <weilin.wang@...el.com>, Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>
CC:     <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [RFC PATCH 10/25] perf stat: Add helper functions to
 hardware-grouping method

Hello,

On 2023/9/25 14:18, weilin.wang@...el.com wrote:
> From: Weilin Wang <weilin.wang@...el.com>
> 
> Add struct metricgroup__pmu_group_list to hold the lists of groups from
> different PMUs. Each PMU has one separate list.
> 
> Add struct metricgroup__group as one node (one group in the grouping
> result) of the metricgroup__pmu_group_list. It uses two bitmaps to log
> counter availabilities(gp counters and fixed counters).
> 
> Add functions to create group and assign event into the groups based on the
> event restrictions (struct metricgroup__event_info) and counter
> availability (pmu_info_list and bitmaps). New group is inserted into the
> list groups.
> 
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
>   tools/perf/util/metricgroup.c | 72 +++++++++++++++++++++++++++++++++++
>   tools/perf/util/metricgroup.h | 37 ++++++++++++++++++
>   2 files changed, 109 insertions(+)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 0ca885a42..de6a6a1d7 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1681,6 +1681,76 @@ static int get_pmu_counter_layouts(struct list_head *pmu_info_list,
>   	return ret;
>   }
>   
> +/**
> + * assign_event_grouping - Assign an event into a group. If existing group
> + * cannot include it, create a new group and insert the event to it.
> + */
> +static int assign_event_grouping(struct metricgroup__event_info *e,
> +				struct list_head *pmu_info_list __maybe_unused,
> +				struct list_head *groups)
> +{
> +	int ret = 0;
> +
> +	struct metricgroup__pmu_group_list *g = NULL;
> +	struct metricgroup__pmu_group_list *pmu_group_head = NULL;
> +
> +	list_for_each_entry(g, groups, nd) {
> +		if (!strcasecmp(g->pmu_name, e->pmu_name)) {
> +			pr_debug("found group for event %s in pmu %s\n", e->name, g->pmu_name);
> +			pmu_group_head = g;
> +			break;
> +		}
> +	}
> +	if (!pmu_group_head) {
> +		struct metricgroup__pmu_counters *p;
> +
> +		pmu_group_head = malloc(sizeof(struct metricgroup__pmu_group_list));
Here may need to check the return value of malloc.

> +		INIT_LIST_HEAD(&pmu_group_head->group_head);
> +		pr_debug("create new group for event %s in pmu %s ", e->name, e->pmu_name);
> +		pmu_group_head->pmu_name = e->pmu_name;
> +		list_for_each_entry(p, pmu_info_list, nd) {
> +			if (!strcasecmp(p->name, e->pmu_name)) {
> +				pmu_group_head->size = p->size;
> +				pmu_group_head->fixed_size = p->fixed_size;
> +			}
> +		}
> +		list_add_tail(&pmu_group_head->nd, groups);
> +	}
> +
> +	//ret = insert_event_to_group(e, pmu_group_head, pmu_info_list);
This is also the commented out code. Can it delete?

> +	return ret;
> +}
> +
> +/**
> + * create_grouping - Create a list of groups and place all the events of
> + * event_info_list into these groups.
> + * @pmu_info_list: the list of PMU units info based on pmu-events data, used for
> + * creating new groups.
> + * @event_info_list: the list of events to be grouped.
> + * @groupings: the list of groups with events placed in.
> + * @modifier: any modifiers added to the events.
> + */
> +static int create_grouping(struct list_head *pmu_info_list,
> +			  struct list_head *event_info_list,
> +			  struct list_head *groupings __maybe_unused,
> +			  const char *modifier __maybe_unused)
> +{
> +	int ret = 0;
> +	struct metricgroup__event_info *e;
> +	LIST_HEAD(groups);
> +	char *bit_buf = malloc(NR_COUNTERS);
Similar to the above, may need to check the malloc return value.

Thanks,
Yang