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paging: Introduce BTS stat paging:available_slots 

This allows analysing the behavior of paging queue at the BTS over time.

Related: SYS#6200
Change-Id: I5f44ac9b9da3ed7120b04d199e52215c0fd3e8a9
This commit is contained in:
Pau Espin 2022-11-22 18:25:17 +01:00 committed by pespin
parent a3e5b0db7d
commit 94951af66a
3 changed files with 20 additions and 5 deletions
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1
include/osmocom/bsc/bts.h
View File

@ -229,6 +229,7 @@ enum {
BTS_STAT_NUM_TRX_RSL_CONNECTED,
BTS_STAT_NUM_TRX_TOTAL,
BTS_STAT_PAGING_REQ_QUEUE_LENGTH,
BTS_STAT_PAGING_AVAILABLE_SLOTS,
BTS_STAT_PAGING_T3113,
};

5
src/osmo-bsc/bts.c
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@ -1044,6 +1044,7 @@ void gsm_bts_stats_reset(struct gsm_bts *bts)
osmo_stat_item_set(osmo_stat_item_group_get_item(bts->bts_statg, BTS_STAT_CHAN_OSMO_DYN_TOTAL), 0);
osmo_stat_item_set(osmo_stat_item_group_get_item(bts->bts_statg, BTS_STAT_PAGING_T3113), 0);
osmo_stat_item_set(osmo_stat_item_group_get_item(bts->bts_statg, BTS_STAT_PAGING_REQ_QUEUE_LENGTH), paging_pending_requests_nr(bts));
osmo_stat_item_set(osmo_stat_item_group_get_item(bts->bts_statg, BTS_STAT_PAGING_AVAILABLE_SLOTS), bts->paging.available_slots);
}
const struct rate_ctr_desc bts_ctr_description[] = {
@ -1699,6 +1700,10 @@ const struct osmo_stat_item_desc bts_stat_desc[] = {
{ "paging:request_queue_length",
"Paging Request queue length",
"", 60, 0 },
[BTS_STAT_PAGING_AVAILABLE_SLOTS] = \
{ "paging:available_slots",
"Available paging slots in this BTS",
"", 60, 0 },
[BTS_STAT_PAGING_T3113] = \
{ "paging:t3113",
"T3113 paging timer",

19
src/osmo-bsc/paging.c
View File

@ -136,6 +136,13 @@ static void paging_schedule_if_needed(struct gsm_bts_paging_state *paging_bts)
paging_handle_pending_requests(paging_bts);
}
/* Placeholder to set the value and update the related osmo_stat: */
static void paging_set_available_slots(struct gsm_bts *bts, uint16_t available_slots)
{
bts->paging.available_slots = available_slots;
osmo_stat_item_set(osmo_stat_item_group_get_item(bts->bts_statg, BTS_STAT_PAGING_AVAILABLE_SLOTS), available_slots);
}
static void paging_give_credit(void *data)
{
struct gsm_bts_paging_state *paging_bts_st = data;
@ -145,7 +152,7 @@ static void paging_give_credit(void *data)
LOG_BTS(bts, DPAG, LOGL_INFO,
"Timeout waiting for CCCH Load Indication, assuming BTS is below Load Threshold (available_slots %u -> %u)\n",
paging_bts_st->available_slots, estimated_slots);
paging_bts_st->available_slots = estimated_slots;
paging_set_available_slots(bts, estimated_slots);
paging_schedule_if_needed(paging_bts_st);
osmo_timer_schedule(&bts->paging.credit_timer, load_ind_timeout, 0);
}
@ -271,7 +278,7 @@ static void paging_handle_pending_requests(struct gsm_bts_paging_state *paging_b
/* handle the paging request now */
page_ms(request);
paging_bts->available_slots--;
paging_set_available_slots(bts, paging_bts->available_slots - 1);
request->last_attempt_ts = now;
request->attempts++;
num_paged++;
@ -303,7 +310,7 @@ void paging_init(struct gsm_bts *bts)
{
bts->paging.bts = bts;
bts->paging.free_chans_need = -1;
bts->paging.available_slots = 0;
paging_set_available_slots(bts, 0);
INIT_LLIST_HEAD(&bts->paging.pending_requests);
osmo_timer_setup(&bts->paging.work_timer, paging_worker, &bts->paging);
osmo_timer_setup(&bts->paging.credit_timer, paging_give_credit, &bts->paging);
@ -609,7 +616,7 @@ void paging_update_buffer_space(struct gsm_bts *bts, uint16_t free_slots)
{
LOG_BTS(bts, DPAG, LOGL_DEBUG, "Rx CCCH Load Indication from BTS (available_slots %u -> %u)\n",
bts->paging.available_slots, free_slots);
bts->paging.available_slots = free_slots;
paging_set_available_slots(bts, free_slots);
/* Re-arm credit_timer if needed */
if (trx_is_usable(bts->c0)) {
paging_schedule_if_needed(&bts->paging);
@ -702,6 +709,7 @@ static int nm_sig_cb(unsigned int subsys, unsigned int signal,
struct gsm_bts *bts;
struct gsm_bts_trx *trx;
unsigned int load_ind_timeout;
uint16_t estimated_slots;
if (signal != S_NM_RUNNING_CHG)
return 0;
@ -729,7 +737,8 @@ static int nm_sig_cb(unsigned int subsys, unsigned int signal,
LOG_BTS(bts, DPAG, LOGL_INFO, "C0 becomes available for paging\n");
/* Fill in initial credit */
load_ind_timeout = bts_no_ccch_load_ind_timeout_sec(bts);
bts->paging.available_slots = paging_estimate_available_slots(bts, load_ind_timeout);
estimated_slots = paging_estimate_available_slots(bts, load_ind_timeout);
paging_set_available_slots(bts, estimated_slots);
/* Start scheduling credit_timer */
osmo_timer_schedule(&bts->paging.credit_timer,
bts_no_ccch_load_ind_timeout_sec(bts), 0);