Ubuntu networking disabled

Sometimes ubuntu network gets disabled & we dont see any option to enabled it

Enable it via below command:

1. remove networkmanager.state

sudo rm -f /var/lib/NetworkManager/NetworkManager.state

2. restart network manager
sudo service network-manager restart

cgroup Memory Resource Controller stats (memory.stats)

Basic concept for memory resource controller:

• Accounting physical memory usage under cgroup
  • anon and file caches
  • when memory limit is hit page in/page out memory
• Limit memory  and swap usage under user specified value
• Memory stats per cgroups
• memory hungry applications can be isolated & limited to defined amount of memory
• OOM control
• moving (recharging) account at moving a task is selectable.

 

Brief summary of control files:

max_usage_in_bytes: show max memory usage recorded
total_pgpgin: Number of kilobytes the system has paged in from disk per second
total_pgpgout: Number of kilobytes the system has paged out to disk per second
total_pgfault: Number of major page faults (major + minor) made by the system per second
total_pgmajfault: Number of major page faults made by the system per second
total_inactive_anon: Number of bytes of anonymous and swap cache memory on inactive LRU list
total_active_anon: Number of bytes of anonymous and swap cache memory on active LRU list
total_inactive_file: Number of bytes of file-backed memory on inactive LRU list.
total_active_file: Number of bytes of file-backed memory on active LRU list

Note:
what is anon pages (Anonymous mapping:
anon is a memory mapping with no file or device backing it (like stack & heap)