On Fri, 2011-02-04 at 14:09 +0100, Peter Zijlstra wrote:

You can do that by keeping ->bw_to_write in task_struct and normalize it
by the estimated bdi bandwidth (patch 5), that way, when you next
increment it it will turn out to be lower and the wait will be shorter.

The down-side is of course that time will leak from the system on exit,
since its impossible to map back to a bdi.

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