FIX elgalu#357 : Use CGROUP limit to determine Java Xmx parameter. (elgalu#358)

Author: lcharlois-neotys

java/bin/java-dynamic-memory-opts.sh

@@ -18,7 +18,14 @@ die () {
 # Required env vars validations
 [ -z "${MEM_JAVA_PERCENT}" ] && die "Need to set env var MEM_JAVA_PERCENT"
 
-MEM_TOTAL_KB=$(cat /proc/meminfo | grep MemTotal | awk '{print $2}')
+MEM_TOTAL_KB=0
+
+CGROUP_LIMIT=$(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)
+if [ $CGROUP_LIMIT -ne 9223372036854771712 ] && [ $CGROUP_LIMIT -gt 0 ] ; then
+  MEM_TOTAL_KB=$CGROUP_LIMIT/1000
+else
+  MEM_TOTAL_KB=$(cat /proc/meminfo | grep MemTotal | awk '{print $2}')
+fi
 MEM_JAVA_KB=$((${MEM_TOTAL_KB} * ${MEM_JAVA_PERCENT} / 100))
 [ -z "${MEM_JAVA}" ] && export MEM_JAVA="${MEM_JAVA_KB}k"