From: Pavel Rochnyack <pavel2000@ngs.ru>
Date: Mon, 9 Oct 2017 20:08:38 +0000 (+0700)
Subject: memcached: Fix hitratio calculation
X-Git-Tag: collectd-5.8.0~45
X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=60bc9b5c6ef49ec78291d64ebe4c58569b1f9a61;hp=cb48bb1590b2953f3d0134f6d6355c61bce7304a

memcached: Fix hitratio calculation

If there is no requests, NAN is reported as hitratio.
If there is no hits - zero is reported.
---

diff --git a/src/memcached.c b/src/memcached.c
index 5a9faf32..85794a5c 100644
--- a/src/memcached.c
+++ b/src/memcached.c
@@ -406,9 +406,12 @@ static gauge_t calculate_ratio_percent(derive_t part, derive_t total,
   *prev_part = part;
   *prev_total = total;
 
-  if (num == 0 || denom == 0)
+  if (denom == 0)
     return NAN;
 
+  if (num == 0)
+    return 0;
+
   return 100.0 * (gauge_t)num / (gauge_t)denom;
 }
 
@@ -426,9 +429,12 @@ static gauge_t calculate_ratio_percent2(derive_t part1, derive_t part2,
   *prev1 = part1;
   *prev2 = part2;
 
-  if (num == 0 || denom == 0)
+  if (denom == 0)
     return NAN;
 
+  if (num == 0)
+    return 0;
+
   return 100.0 * (gauge_t)num / (gauge_t)denom;
 }