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    SubjectRe: [PATCH] per-cgroup tcp buffer limitation
    On 09/13/2011 03:46 PM, Paul Menage wrote:
    > On Tue, Sep 13, 2011 at 11:11 AM, Glauber Costa<glommer@parallels.com> wrote:
    >>
    >> What if they are all updated under the same lock ?
    >
    > Right, that would be the kind of optimization that would remove the
    > need for worrying about whether or not to account it. It would
    > probably mean creating some memcg-specific structures like
    > res-counters that could handle multiple values, since you'd need to
    > update both the kernel charge and the total charge, in this cgroup
    > *and* its ancestors.
    >
    > Paul
    If we do that, we may have to commit to an intermediary user interface -
    with controls to to determine if kernel memory is billed to kernel or
    total, a enable/disable file, just to later render it pointless by a new
    optimization - that we seem to agree that seems possible.

    I think it is preferred to always assume kernel memory is accounted to
    the kernel, and when we optimize it, no changes are made to what's
    exposed to userspace.


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