Re: [PATCH] Memory Resource Controller Add Boot Option

["Paul Menage" <menage@google.com>]

On Mon, Feb 25, 2008 at 3:55 AM, Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>
>
>  A boot option for the memory controller was discussed on lkml. It is a good
>  idea to add it, since it saves memory for people who want to turn off the
>  memory controller.
>
>  By default the option is on for the following two reasons
>
>  1. It provides compatibility with the current scheme where the memory
>    controller turns on if the config option is enabled
>  2. It allows for wider testing of the memory controller, once the config
>    option is enabled
>
>  We still allow the create, destroy callbacks to succeed, since they are
>  not aware of boot options. We do not populate the directory will
>  memory resource controller specific files.

Would it make more sense to have a generic cgroups boot option for this?

Something like cgroup_disable=xxx, which would be parsed by cgroups
and would cause:

- a "disabled" flag to be set to true in the subsys object (you could
use this in place of the mem_cgroup_on flag)

- prevent the disabled cgroup from being bound to any mounted
hierarchy (so it would be ignored in a mount with no subsystem
options, and a mount with options that specifically pick that
subsystem would give an error)

Paul

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