mirror of https://gerrit.osmocom.org/libosmocore
osmo_time_cc: rate_ctr presence should not affect counting
Make sure that osmo_time_cc counts exactly the same, regardless of a rate_ctr being present or not. Only skip sending counter increments when there is no rate counter, do not affect anything else. In osmo-bsc, we are discussing a patch where an lchan redirects osmo_time_cc counter increments to different rate counters depending on its current type. In my comments I am also claiming that osmo_time_cc works the same regardless of a rate_ctr being present or not. Looking at the code, this is not actually the case. Before this patch, when there is no rate_ctr, the reported_sum would freeze, and as soon as a rate_ctr shows up, all counter increments from the previous reported_sum would be sent to the newly set rate_ctr. Instead, we want counter increments to simply be lost while there is no rate_ctr set. IOW, rate_ctr == NULL should mean >/dev/null. Related: I1b0670c47cb5e0b7776eda89d1e71545ba0e3347 (osmo-bsc) Change-Id: I380b28d7ab0a6c8aab6c7e2a64bc73cab14863d2
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@ -120,8 +120,6 @@ static void osmo_time_cc_report(struct osmo_time_cc *tc, uint64_t now)
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{
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uint64_t delta;
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uint64_t n;
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if (!tc->cfg.rate_ctr)
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return;
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/* We report a sum "rounded up", ahead of time. If the granularity period has not yet elapsed after the last
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* reporting, do not report again yet. */
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if (tc->reported_sum > tc->sum)
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@ -139,7 +137,8 @@ static void osmo_time_cc_report(struct osmo_time_cc *tc, uint64_t now)
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/* integer sanity, since rate_ctr_add() takes an int argument. */
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if (n > INT_MAX)
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n = INT_MAX;
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rate_ctr_add(tc->cfg.rate_ctr, n);
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if (tc->cfg.rate_ctr)
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rate_ctr_add(tc->cfg.rate_ctr, n);
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/* Store the increments of gran_usec that were counted. */
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tc->reported_sum += n * GRAN_USEC(tc);
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}
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@ -205,7 +204,7 @@ static void osmo_time_cc_schedule_timer(struct osmo_time_cc *tc, uint64_t now)
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next_event = OSMO_MIN(next_event, next_forget_time);
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}
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/* Next rate_ctr increment? */
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if (tc->flag_state && tc->cfg.rate_ctr) {
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if (tc->flag_state) {
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uint64_t next_inc = now + (tc->reported_sum - tc->sum) + ROUND_THRESHOLD_USEC(tc);
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next_event = OSMO_MIN(next_event, next_inc);
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}
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