[lxc-users] LXC v2.0.8 - "kernel same-page merging" between containers

[Ron Kelley]

Greetings all.

We are running LXC v2.0.8 on Ubuntu 16.04 and all containers are running identical versions of the application stack (php, php-fpm, nginx, etc).  Since each container is running the exact same versions of apps, how can I get the host server to use KSM (kernel same-page merging) on the containers?  As you can see below, KSM has been enabled, but no pages seem to be shared.


Some additional info:

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root at container01:# uname -a
Linux HJ-WP-Container-001 4.4.0-57-generic #78-Ubuntu SMP Fri Dec 9 23:50:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
-------------------

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root at container01:# grep KSM /boot/config-4.4.0-57-generic
CONFIG_KSM=y
-------------------

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root at container01:# ls -la /sys/kernel/mm/ksm/
total 0
drwxr-xr-x 2 root root    0 Feb 10 14:25 .
drwxr-xr-x 6 root root    0 Feb 10 14:24 ..
-r--r--r-- 1 root root 4096 Feb 10 14:25 full_scans
-rw-r--r-- 1 root root 4096 Feb 10 14:25 merge_across_nodes
-r--r--r-- 1 root root 4096 Feb 10 14:25 pages_shared
-r--r--r-- 1 root root 4096 Feb 10 14:25 pages_sharing
-rw-r--r-- 1 root root 4096 Feb 10 14:25 pages_to_scan
-r--r--r-- 1 root root 4096 Feb 10 14:25 pages_unshared
-r--r--r-- 1 root root 4096 Feb 10 14:25 pages_volatile
-rw-r--r-- 1 root root 4096 Feb  2 07:07 run
-rw-r--r-- 1 root root 4096 Feb 10 14:25 sleep_millisecs
-------------------

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root at container01:#  cat /sys/kernel/mm/ksm/pages_shared
0
-------------------



Thanks.

-Ron