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

Yang Jihong
2023-09-26T03:45:50Z

Hello,

On 2023/9/25 14:18, weilin.wang@intel.com wrote:
> From: Weilin Wang <weilin.wang@intel.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@intel.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