[Users] Can't create directory /sys/fs/cgroup/memory/machine.slice/ Cannot allocate memory

[Joe Dougherty]

I'm running into an issue on only 1 of my OpenVZ 7 nodes where it's unable
to create a directory on /sys/fs/cgroup/memory/machine.slice due to "Cannot
allocate memory" whenever I try to start a new container or restart and
existing one. I've been trying to research this but I'm unable to find any
concrete info on what could cause this. It appears to be memory related
because sometimes if I issue "echo 1 /proc/sys/vm/drop_caches" it allows me
to start a container (this only works sometimes) but my RAM usage is
extremely low with no swapping (swappiness even set to 0 for testing).
Thank you in advance for your help.


Example:
*# vzctl start 9499*
*Starting Container ...*
*Mount image: /vz/private/9499/root.hdd*
*Container is mounted*
*Can't create directory /sys/fs/cgroup/memory/machine.slice/9499: Cannot
allocate memory*
*Unmount image: /vz/private/9499/root.hdd (190)*
*Container is unmounted*
*Failed to start the Container*


Node Info:
*Uptime:      10 days*
*OS:          Virtuozzo 7.0.15*
*Kernel:      3.10.0-1127.18.2.vz7.163.46 GNU/Linux*
*System Load: 3.1*
*/vz Usage:   56% of 37T*
*Swap Usage:  0%*
*RAM Free:    84% of 94.2GB*

*# free -m*
*                    total        used        free            shared
 buff/cache   available*
*Mem:          96502       14259     49940         413         32303
   80990*
*Swap:         32767       93           32674*
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