Created
March 15, 2017 18:45
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#!/bin/bash | |
#!/usr/bin/env bash | |
# This script reproduces what kubelet/cAdvisor does | |
# to calculate memory.available relative to root cgroup. | |
# The major change is that it excludes total_inactive_file memory. | |
# current memory usage | |
memory_capacity_in_kb=$(cat /proc/meminfo | grep MemTotal | awk '{print $2}') | |
memory_capacity_in_bytes=$((memory_capacity_in_kb * 1024)) | |
memory_usage_in_bytes=$(cat /sys/fs/cgroup/memory/memory.usage_in_bytes) | |
memory_total_inactive_file=$(cat /sys/fs/cgroup/memory/memory.stat | grep total_inactive_file | awk '{print $2}') | |
memory_total_inactive_anon=$(cat /sys/fs/cgroup/memory/memory.stat | grep total_inactive_anon | awk '{print $2}') | |
memory_working_set=$memory_usage_in_bytes | |
if [ "$memory_working_set" -lt "$memory_total_inactive_file" ]; | |
then | |
memory_working_set=0 | |
else | |
memory_working_set=$((memory_usage_in_bytes - memory_total_inactive_file)) | |
fi | |
memory_available_in_bytes=$((memory_capacity_in_bytes - memory_working_set)) | |
memory_available_in_kb=$((memory_available_in_bytes / 1024)) | |
memory_available_in_mb=$((memory_available_in_kb / 1024)) | |
echo "memory.capacity_in_bytes $memory_capacity_in_bytes" | |
echo "memory.usage_in_bytes $memory_usage_in_bytes" | |
echo "memory.total_inactive_file $memory_total_inactive_file" | |
echo "memory.total_inactive_anon $memory_total_inactive_anon" | |
echo "memory.working_set $memory_working_set" | |
echo "memory.available_in_bytes $memory_available_in_bytes" | |
echo "memory.available_in_kb $memory_available_in_kb" | |
echo "memory.available_in_mb $memory_available_in_mb" |
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