MINOR: freq_ctr: add new functions to report float measurements
For stats reporting it can be convenient to report floats at low rates
instead of discrete integers. We do have quite some precision since we
currently divide counters by number of milliseconds, so we can usually
add 3 digits after the decimal point.
diff --git a/include/haproxy/freq_ctr.h b/include/haproxy/freq_ctr.h
index 93c3eae..a59a3f9 100644
--- a/include/haproxy/freq_ctr.h
+++ b/include/haproxy/freq_ctr.h
@@ -104,6 +104,16 @@
return div64_32(total, period);
}
+/* same as read_freq_ctr_period() above except that floats are used for the
+ * output so that low rates can be more precise.
+ */
+static inline double read_freq_ctr_period_flt(struct freq_ctr *ctr, uint period)
+{
+ ullong total = freq_ctr_total(ctr, period, -1);
+
+ return (double)total / (double)period;
+}
+
/* Read a 1-sec frequency counter taking history into account for missing time
* in current period.
*/
@@ -112,6 +122,14 @@
return read_freq_ctr_period(ctr, MS_TO_TICKS(1000));
}
+/* same as read_freq_ctr() above except that floats are used for the
+ * output so that low rates can be more precise.
+ */
+static inline double read_freq_ctr_flt(struct freq_ctr *ctr)
+{
+ return read_freq_ctr_period_flt(ctr, MS_TO_TICKS(1000));
+}
+
/* Returns the number of remaining events that can occur on this freq counter
* while respecting <freq> events per period, and taking into account that
* <pend> events are already known to be pending. Returns 0 if limit was reached.