Messages in this thread | | | Date | Tue, 22 Apr 2008 16:54:18 +0200 | From | Jens Axboe <> | Subject | Re: [RFC][PATCH 0/10] I/O context inheritance |
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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?
-- Jens Axboe
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