Apply TCP-like flow control to processes writing to the filesystem (put them to sleep when there is "congestion"), to avoid enormous backlogs and provide more fair allocation of disk bandwidth.

This is a nontrivial undertaking as the I/O path wasn't intended to support this type of throttling. Also, the throttle should be underneath all caching (there is nothing to be gained by throttling cached accesses) but by that point attributing I/O actions to specific processes is awkward.

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