lib/riemann/babbler/plugins/memory.rb in riemann-babbler-0.5.3 vs lib/riemann/babbler/plugins/memory.rb in riemann-babbler-0.5.4

@@ -12,10 +12,10 @@
     total = m['MemTotal'].to_i
     used = total - free
     free_bc = free + buffers + cached
 
     fraction = 1 - (free.to_f / total)
-    swap_fraction = (m['SwapTotal'] - m['SwapFree']).to_f/m['SwapTotal']
+    swap_fraction = m['SwapTotal'] == 0 ? 0 : 1 - m['SwapFree'].to_f/m['SwapTotal']
 
     desc = "usage\n\n#{shell('ps -eo pmem,pid,cmd | sort -nrb -k1 | head -10').chomp}"
 
     [
       { :service => plugin.service + " % free", :metric => fraction },