[Bug 1900663] [NEW] Re-enable memory cgroups

[Juerg Haefliger]

Public bug reported:

Currently, the 5.4 and 5.8 raspi kernels disable the memory cgroup by
default to conserve memory [1]. This is a legacy custom modification,
that is no longer needed, since the memory cgroup code has been
rewritten to no longer requires large amounts of memory [2]. So the
custom patch can be dropped. The patch is also the reason why the LXC
ADT test fails.

[1] https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux-raspi/+git/focal/commit/?id=64e543b88ea2a013e1d8e014e7c92c53df1322ed
[2] https://github.com/torvalds/linux/commit/1306a85aed3ec3db98945aafb7dfbe5648a1203c

** Affects: linux-raspi (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-raspi (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: linux-raspi (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Package changed: livecd-rootfs (Ubuntu) => linux-raspi (Ubuntu)

** Also affects: linux-raspi (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: linux-raspi (Ubuntu Focal)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1900663

Title:
  Re-enable memory cgroups

Status in linux-raspi package in Ubuntu:
  New
Status in linux-raspi source package in Focal:
  New
Status in linux-raspi source package in Groovy:
  New

Bug description:
  Currently, the 5.4 and 5.8 raspi kernels disable the memory cgroup by
  default to conserve memory [1]. This is a legacy custom modification,
  that is no longer needed, since the memory cgroup code has been
  rewritten to no longer requires large amounts of memory [2]. So the
  custom patch can be dropped. The patch is also the reason why the LXC
  ADT test fails.

  [1] https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux-raspi/+git/focal/commit/?id=64e543b88ea2a013e1d8e014e7c92c53df1322ed
  [2] https://github.com/torvalds/linux/commit/1306a85aed3ec3db98945aafb7dfbe5648a1203c

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