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[David Favor <david@xxxxxxxxxxxxxx>]

The problem appears to be around line 102 of the lxc-checkconfig script.

echo -n "Cgroup memory controller: "

is followed by a slightly flawed check for kernel version...

if [ $KVER_MAJOR -ge 3 -a $KVER_MINOR -ge 6 ]; then
    is_enabled CONFIG_MEMCG
else
    is_enabled CONFIG_CGROUP_MEM_RES_CTLR
fi

The test - $KVER_MAJOR -ge 3 - passes, as this will be '4'.

The test - $KVER_MINOR -ge 6 - will fail, as the minor is '0'.

Likely a more robust test is to test for CONFIG_CGROUP_MEM_RES_CTLR
in kernel-3.6 + below.

The 4.0.7 kernel config file shows...

config-4.0.7-040007-generic:CONFIG_MEMCG=y
config-4.0.7-040007-generic:CONFIG_MEMCG_SWAP=y
config-4.0.7-040007-generic:# CONFIG_MEMCG_SWAP_ENABLED is not set
config-4.0.7-040007-generic:CONFIG_MEMCG_KMEM=y

Which is correct, as CONFIG_CGROUP_MEM_RES_CTLR seems to have been
deprecated.

-- 
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https://bugs.launchpad.net/bugs/1471358

Title:
  lxc-checkconfig shows Mainline PPA Wily-4.0.7 kernel missing memory
  controller

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  net8-rmt# uname -a
  Linux ns515383.ip-167-114-159.net 4.0.7-040007-generic #201507031036 SMP Fri Jul 3 10:37:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  net8-rmt# lxc-checkconfig | grep missing
  Cgroup memory controller: missing

  net8-rmt# grep cgroup /proc/mounts | grep memory
  cgroup /sys/fs/cgroup/memory cgroup rw,relatime,memory,release_agent=/run/cgmanager/agents/cgm-release-agent.memory 0 0

  So it appears the memory controller is available + lxc-checkconfig
  just fails to report it correctly.

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