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    SubjectRe: [PATCH 3/5] page_cgroup: make page tracking available for blkio
    On Wed, 23 Feb 2011 00:01:47 +0100
    Andrea Righi <> wrote:

    > > My immediate observation is that you're not really tracking the "owner"
    > > here - you're tracking an opaque 16-bit token known only to the block
    > > controller in a field which - if changed by anybody other than the block
    > > controller - will lead to mayhem in the block controller. I think it
    > > might be clearer - and safer - to say "blkcg" or some such instead of
    > > "owner" here.
    > Basically the idea here was to be as generic as possible and make this
    > feature potentially available also to other subsystems, so that cgroup
    > subsystems may represent whatever they want with the 16-bit token.
    > However, no more than a single subsystem may be able to use this feature
    > at the same time.

    That makes me nervous; it can't really be used that way unless we want to
    say that certain controllers are fundamentally incompatible and can't be
    allowed to play together. For whatever my $0.02 are worth (given the
    state of the US dollar, that's not a whole lot), I'd suggest keeping the
    current mechanism, but make it clear that it belongs to your controller.
    If and when another controller comes along with a need for similar
    functionality, somebody can worry about making it more general.


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