[v3] eal: support lcore usage ratio

  Current, the lcore usage only display two key fields: busy_cycles and
total_cycles, which is inconvenient to obtain the usage ratio
immediately. So adds lcore usage ratio field.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>

---
v3: change %.2f to %.02f according Morten's comments.
v2: address Morten's comments.

---
 lib/eal/common/eal_common_lcore.c | 35 ++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)
  

lgtm,
Acked-by: Huisong Li <lihuisong@huawei.com>

在 2023/10/23 20:51, Chengwen Feng 写道:
> Current, the lcore usage only display two key fields: busy_cycles and
> total_cycles, which is inconvenient to obtain the usage ratio
> immediately. So adds lcore usage ratio field.
>
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> Acked-by: Morten Brørup <mb@smartsharesystems.com>
>
> ---
> v3: change %.2f to %.02f according Morten's comments.
> v2: address Morten's comments.
>
> ---
>   lib/eal/common/eal_common_lcore.c | 35 ++++++++++++++++++++++++++++---
>   1 file changed, 32 insertions(+), 3 deletions(-)
>
> diff --git a/lib/eal/common/eal_common_lcore.c b/lib/eal/common/eal_common_lcore.c
> index ceda714ca5..a35fa9a3e7 100644
> --- a/lib/eal/common/eal_common_lcore.c
> +++ b/lib/eal/common/eal_common_lcore.c
> @@ -446,6 +446,13 @@ rte_lcore_register_usage_cb(rte_lcore_usage_cb cb)
>   	lcore_usage_cb = cb;
>   }
>   
> +static float
> +calc_usage_ratio(const struct rte_lcore_usage *usage)
> +{
> +	return usage->total_cycles != 0 ?
> +		(usage->busy_cycles * 100.0) / usage->total_cycles : (float)0;
> +}
> +
>   static int
>   lcore_dump_cb(unsigned int lcore_id, void *arg)
>   {
> @@ -462,8 +469,9 @@ lcore_dump_cb(unsigned int lcore_id, void *arg)
>   	/* Guard against concurrent modification of lcore_usage_cb. */
>   	usage_cb = lcore_usage_cb;
>   	if (usage_cb != NULL && usage_cb(lcore_id, &usage) == 0) {
> -		if (asprintf(&usage_str, ", busy cycles %"PRIu64"/%"PRIu64,
> -				usage.busy_cycles, usage.total_cycles) < 0) {
> +		if (asprintf(&usage_str, ", busy cycles %"PRIu64"/%"PRIu64" (ratio %.02f%%)",
> +				usage.busy_cycles, usage.total_cycles,
> +				calc_usage_ratio(&usage)) < 0) {
>   			return -ENOMEM;
>   		}
>   	}
> @@ -511,11 +519,19 @@ struct lcore_telemetry_info {
>   	struct rte_tel_data *d;
>   };
>   
> +static void
> +format_usage_ratio(char *buf, uint16_t size, const struct rte_lcore_usage *usage)
> +{
> +	float ratio = calc_usage_ratio(usage);
> +	snprintf(buf, size, "%.02f%%", ratio);
> +}
> +
>   static int
>   lcore_telemetry_info_cb(unsigned int lcore_id, void *arg)
>   {
>   	struct rte_config *cfg = rte_eal_get_configuration();
>   	struct lcore_telemetry_info *info = arg;
> +	char ratio_str[RTE_TEL_MAX_STRING_LEN];
>   	struct rte_lcore_usage usage;
>   	struct rte_tel_data *cpuset;
>   	rte_lcore_usage_cb usage_cb;
> @@ -544,6 +560,8 @@ lcore_telemetry_info_cb(unsigned int lcore_id, void *arg)
>   	if (usage_cb != NULL && usage_cb(lcore_id, &usage) == 0) {
>   		rte_tel_data_add_dict_uint(info->d, "total_cycles", usage.total_cycles);
>   		rte_tel_data_add_dict_uint(info->d, "busy_cycles", usage.busy_cycles);
> +		format_usage_ratio(ratio_str, sizeof(ratio_str), &usage);
> +		rte_tel_data_add_dict_string(info->d, "usage_ratio", ratio_str);
>   	}
>   
>   	return 0;
> @@ -574,11 +592,13 @@ struct lcore_telemetry_usage {
>   	struct rte_tel_data *lcore_ids;
>   	struct rte_tel_data *total_cycles;
>   	struct rte_tel_data *busy_cycles;
> +	struct rte_tel_data *usage_ratio;
>   };
>   
>   static int
>   lcore_telemetry_usage_cb(unsigned int lcore_id, void *arg)
>   {
> +	char ratio_str[RTE_TEL_MAX_STRING_LEN];
>   	struct lcore_telemetry_usage *u = arg;
>   	struct rte_lcore_usage usage;
>   	rte_lcore_usage_cb usage_cb;
> @@ -591,6 +611,8 @@ lcore_telemetry_usage_cb(unsigned int lcore_id, void *arg)
>   		rte_tel_data_add_array_uint(u->lcore_ids, lcore_id);
>   		rte_tel_data_add_array_uint(u->total_cycles, usage.total_cycles);
>   		rte_tel_data_add_array_uint(u->busy_cycles, usage.busy_cycles);
> +		format_usage_ratio(ratio_str, sizeof(ratio_str), &usage);
> +		rte_tel_data_add_array_string(u->usage_ratio, ratio_str);
>   	}
>   
>   	return 0;
> @@ -603,15 +625,19 @@ handle_lcore_usage(const char *cmd __rte_unused, const char *params __rte_unused
>   	struct lcore_telemetry_usage usage;
>   	struct rte_tel_data *total_cycles;
>   	struct rte_tel_data *busy_cycles;
> +	struct rte_tel_data *usage_ratio;
>   	struct rte_tel_data *lcore_ids;
>   
>   	lcore_ids = rte_tel_data_alloc();
>   	total_cycles = rte_tel_data_alloc();
>   	busy_cycles = rte_tel_data_alloc();
> -	if (lcore_ids == NULL || total_cycles == NULL || busy_cycles == NULL) {
> +	usage_ratio = rte_tel_data_alloc();
> +	if (lcore_ids == NULL || total_cycles == NULL || busy_cycles == NULL ||
> +	    usage_ratio == NULL) {
>   		rte_tel_data_free(lcore_ids);
>   		rte_tel_data_free(total_cycles);
>   		rte_tel_data_free(busy_cycles);
> +		rte_tel_data_free(usage_ratio);
>   		return -ENOMEM;
>   	}
>   
> @@ -619,12 +645,15 @@ handle_lcore_usage(const char *cmd __rte_unused, const char *params __rte_unused
>   	rte_tel_data_start_array(lcore_ids, RTE_TEL_UINT_VAL);
>   	rte_tel_data_start_array(total_cycles, RTE_TEL_UINT_VAL);
>   	rte_tel_data_start_array(busy_cycles, RTE_TEL_UINT_VAL);
> +	rte_tel_data_start_array(usage_ratio, RTE_TEL_STRING_VAL);
>   	rte_tel_data_add_dict_container(d, "lcore_ids", lcore_ids, 0);
>   	rte_tel_data_add_dict_container(d, "total_cycles", total_cycles, 0);
>   	rte_tel_data_add_dict_container(d, "busy_cycles", busy_cycles, 0);
> +	rte_tel_data_add_dict_container(d, "usage_ratio", usage_ratio, 0);
>   	usage.lcore_ids = lcore_ids;
>   	usage.total_cycles = total_cycles;
>   	usage.busy_cycles = busy_cycles;
> +	usage.usage_ratio = usage_ratio;
>   
>   	return rte_lcore_iterate(lcore_telemetry_usage_cb, &usage);
>   }
  

23/10/2023 14:51, Chengwen Feng:
> Current, the lcore usage only display two key fields: busy_cycles and
> total_cycles, which is inconvenient to obtain the usage ratio
> immediately. So adds lcore usage ratio field.
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Huisong Li <lihuisong@huawei.com>

Added "telemetry" in the title,
and applied, thanks.