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linuxlinux-kernelcgroups

PALLOC Linux Kernel 4.4

Been trying to get PALLOC(https://github.com/heechul/palloc) for cache partitioning to work on the Linux 4.4.123 kernel. We're using Ubuntu 16.04.

The problem is that we cannot create a cgroup as per ordinated by the official documentation(Attached above). We've tried running the commands, but the first one is not able to be executed. This is the return we get: 

mount: xxx is already mounted or /sys/fs/cgroup busy

There are some processes hugging /sys/fs/cgroup but when tried killing them, they just reappear.

We also tried creating a new directory in /sys/fs/cgroup but it responds with saying that it's a read-only filesystem.

We've tried the following without any success:

  1. Remounting /sys/fs/cgroup as read-write, which succeded but when creating a dir. part1 it is empty. The documentation suggests this should contain numerous files.
  2. Mounting the cgroup as a temporary filesystem as per instructions of Kernel documentation(https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt). And mounted a cgroup fs to it, this worked but didn't include the file palloc.bins which PALLOC needs.

Anyone got any advice/solutions to share on the problem? Thanks in advance!

Solution

  • The cgroup structure for Linux is changed, as there is now a controller called 'palloc' which is where all new directories should be created. You should be able to create a new directory in the 'palloc' controller using the same mkdir command.

    You could also try using the cgcreate tool to create a new directory in the 'palloc' controller by using the following command:

    cgcreate -g palloc:part1