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    SubjectRe: [PATCH 3/9] bio-cgroup controller
    On Tue, 14 Apr 2009 22:21:14 +0200
    Andrea Righi <> wrote:

    > Subject: [PATCH 3/9] bio-cgroup controller

    Sorry, but I have to register extreme distress at the name of this.
    The term "bio" is well-established in the kernel and here we have a new
    definition for the same term: "block I/O".

    "bio" was a fine term for you to have chosen from the user's
    perspective, but from the kernel developer perspective it is quite
    horrid. The patch adds a vast number of new symbols all into the
    existing "bio_" namespace, many of which aren't related to `struct bio'
    at all.

    At least, I think that's what's happening. Perhaps the controller
    really _is_ designed to track `struct bio'? If so, that's an odd thing
    to tell userspace about.

    > The controller bio-cgroup is used by io-throttle to track writeback IO
    > and for properly apply throttling.

    Presumably it tracks all forms of block-based I/O and not just delayed

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