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    SubjectRe: [dm-devel] Re: [RFC][PATCH 0/10] I/O context inheritance
    On Tue, Apr 22, 2008 at 7:54 AM, Jens Axboe <jens.axboe@oracle.com> wrote:
    > On Tue, Apr 22 2008, Hirokazu Takahashi wrote:
    > > Hi,
    > >
    > > Sorry, these patches are for linux-2.6.25.
    > >
    > > > This series of patches make the block I/O layer and the I/O schedulers
    > > > be able to determine the right io_context of every I/O.
    > > >
    > > > The current implementation of the block I/O layer and the I/O schedulers
    > > > assume that the current process is the one which issued the given I/O,
    > > > then use the io_context of this process to control the I/O.
    > > > But this assumption isn't quite right because several kernel threads
    > > > will handle I/O requests on behalf of the processes which originated them.
    > > > This often happens when you want to use device mapper modules.
    > > >
    > > > The patches make every bio has a pointer to an io_context, which will
    > > > be set when it is allocated or cloned. So it makes it possible to find
    > > > the right io_context from any bio at any place.
    > > >
    > > > I'm waiting for your comments.
    >
    > Can you give a brief summary of what you need this stuff for?
    >

    I am not sure if this the intended application, but I have been
    looking at supporting ionice over software-raid and this series seems
    like a necessary first step.

    --
    Dan


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