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Write Clustering: or Getting the VM and the VFS talking
In today disks, we want to minimise seeks times because they are very
costly. We use write clustering to minimise them. Currently Linux is
not very good at it. The problems are: a) all the interfaces are
page/buffer based, and we need context information to be able to do
write clustering, b) is that the VM is the layer that knows what
information needs to be written, and the VFS knows how to write that
information. We need a way to pass that information from one layer to
the other without coupling the two subsystems.
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