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    SubjectRe: [RFC] [PATCH -mm] cgroup: limit the amount of dirty file pages
    Dave Hansen wrote:
    > On Tue, 2008-09-09 at 17:38 +0200, Andrea Righi wrote:
    >> It allows to control how much dirty file pages a cgroup can have at any
    >> given time. This feature is supposed to be strictly connected to a
    >> generic cgroup IO controller (see below).
    >
    > So, this functions similarly to our global dirty ratio? Is it just
    > intended to keep a cgroup from wedging itself too hard with too many
    > dirty pages, just like the global ratio?
    >
    > -- Dave

    Correct, it's the same functionality provided by vm.dirty_ratio and
    vm.dirty_background_ratio, except that is intended to be per-cgroup.

    Without this functionality, a cgroup can even dirty all its memory,
    allocated by the memory controller, since statistics and writeback
    configurations are global.

    -Andrea


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